中文核心期刊
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中国化学与物理电源行业协会会刊
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20 August 2026, Volume 50 Issue 8
    

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    Industry Commentary
  • WANG Yingying, LIU Jianhua, GUO Xiaoqian, FU Dingmi, ZHANG Zhihuan, CHEN Shou
    Chinese Journal of Power Sources. 2026, 50(8): 1385-1392.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Against the backdrop of accelerating global energy transition and electrification, the new energy battery industry is experiencing rapid growth, with talent demand exhibiting increasingly hierarchical and multidisciplinary characteristics along with industrial evolution. Existing studies mainly focus on macro-level analyses such as employment scale and skills shortages, while systematic discussions on talent structure transformation driven by technological coupling and application expansion within the battery industry remain limited. From a value chain perspective, this study analyzes the evolution and distribution patterns of talent structure in the new energy battery industry, and further examines the extension of talent demand under the context of industrial globalization. The results show that talent demand follows a progressive distribution along the “materials-manufacturing-system” chain, with manufacturing and engineering roles dominating, while system and application-oriented positions are growing rapidly. Meanwhile, competency requirements are shifting from single-discipline expertise toward interdisciplinary integration, and the talent gap is transitioning from quantitative shortage to structural mismatch. With the increasing influence of international regulatory frameworks—such as carbon footprint requirements, supply chain due diligence, and information disclosure—the industry is evolving from a technology-driven paradigm toward a “technology-regulation co-driven” model. This shift further drives demand for composite competencies, particularly in technical trade-related roles, which serve as a critical bridge between international rule participation and enterprise-level compliance implementation, yet remain significantly undersupplied. Building upon these findings, this study systematically examines talent development pathways from the perspective of value chain coordination and competency evolution. The results indicate that discipline-oriented training models are insufficient to meet industrial needs. Instead, a coordinated approach integrating education systems, vocational training, enterprise practice, and institutional support is required to facilitate the transition toward competency-based talent development, thereby establishing a comprehensive talent supply system covering materials, manufacturing, systems, and international applications.
  • Review
  • MA Zongren, WANG Changming, WANG Hui, DENG Fubin, YANG Jie, WU Jingbo, WANG Shiyu, NIU Shu
    Chinese Journal of Power Sources. 2026, 50(8): 1393-1404. https://doi.org/10.3969/j.issn.1002-087X.2026.08.001
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    Vanadium redox flow batteries (VRFBs) have emerged as a pivotal technology for large-scale energy storage due to their high safety and long cycle life. The performance of electrode materials directly determines the overall battery efficiency, yet conventional carbon-based electrodes face challenges such as poor hydrophilicity, insufficient active sites, and sluggish reaction kinetics. Metal oxide-modified carbon-based electrode materials, as an effective optimization strategy, have garnered significant attention. Metal oxide catalysts not only offer advantages like low cost and diverse varieties but also exhibit strong oxidation capabilities, making them ideal candidates for enhancing electrode performance. This paper reviews recent research progress on metal oxide-modified electrodes in VRFBs, systematically classifying different types of metal oxide catalysts based on elemental group similarities and atomic counts. Furthermore, it analyzes the catalytic mechanisms and performance of various catalysts, while providing perspectives on future research directions for electrode materials and catalysts.
  • WANG Wenzhi, CHEN Bing, LAO Huiyan, CHEN Xinghao, LIANG Weiye
    Chinese Journal of Power Sources. 2026, 50(8): 1405-1415. https://doi.org/10.3969/j.issn.1002-087X.2026.08.002
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    Layered oxides have emerged as one of the most promising cathode materials for commercialized sodium-ion batteries (SIBs) due to their abundant resources and low cost. However, these materials still face critical challenges during cycling, including structural degradation, intense interfacial side reactions, and poor air stability, which severely limit their practical electrochemical performance and long-term cycling life. This review systematically addresses challenges in the structure, interfaces, and air stability of layered oxide cathodes, focusing on two key strategies: intrinsic structural regulation and surface/interface function optimization, and summarizes recent significant advances in related research. Advanced synthesis methods, phase structure design, and ion doping strategies enhance the bulk stability of materials. Surface coating and optimized electrolyte composition contribute to constructing highly stable electrode/electrolyte interfaces. Enhancing the multidimensional stability of layered oxide cathodes provides a theoretical basis and technical pathway for their rational design and practical development.
  • QIU Peng, SUN Dongliang, YUE Yunkai, YANG Junling, ZHANG Zhentao, CHEN Xun
    Chinese Journal of Power Sources. 2026, 50(8): 1416-1426. https://doi.org/10.3969/j.issn.1002-087X.2026.08.003
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    In order to solve that problems of low energy utilization efficiency and single function exist in a single photovoltaic or photothermal technology, and promote the comprehensive utilization of solar energy at a higher level, through literature review and comparative analysis, this paper systematically combs solar PV photothermal (PV/T) research progress and development trend of comprehensive utilization technology. The article first expounds PV/T the basic structure and working principle of the system, it is pointed out that it can output electric energy and thermal energy synchronously through integrated design. PV/T the adaptability of the system, the application of condensing and spectral frequency division technology and other key dimensions are reviewed, and the current research emphases and technical breakthroughs are reviewed. Finally, the paper further discusses the system integration and engineering application. PV/T technology in "PV/T+" the multi-coupling path under the model shows its potential as a regional integrated energy node.
  • Research and design: Chemicalpower sources
  • HUANG Boyun, SUN Xinxing, LI Yujie, SUN Weiwei, ZHENG Chunman, LIU Shuangke
    Chinese Journal of Power Sources. 2026, 50(8): 1427-1434. https://doi.org/10.3969/j.issn.1002-087X.2026.08.004
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    Lithium-sulfur (Li-S) batteries have ultrahigh theoretical energy density, making them one of the most promising candidates for flexible energy storage. However, their widespread commercialization is still hindered by the severe polysulfide shuttle effect. FeCo2S4 nanowire arrays were grown in situ on carbon cloth (CC) via a two-step hydrothermal method to form FeCo2S4@CC, onto which a high-sulfur carbon/sulfur composite was loaded by slurry-coating to fabricate a flexible sulfur cathode (FeCo2S4@CC/S). A carbon/sulfur composite with high sulfur content was then loaded onto FeCo2S4@CC through a slurry-coating process, thereby fabricating a flexible sulfur cathode (FeCo2S4@CC/S).The results show that FeCo₂S₄ nanowires grow vertically on carbon fibers, forming a three-dimensional network that provides ample sulfur accommodation space and alleviates electrode volume expansion. Furthermore, FeCo2S4 nanowires exhibit catalytic activity and strong polysulfide adsorption, efficiently promoting Li2S8 conversion to long-chain Li2Sx and accelerating reaction kinetics. This significantly suppresses the shuttle effect and improves active material utilization. Compared with CC-based cathodes, the FeCo2S4@CC-based cathode exhibits better rate capability and cycling stability, delivering an initial discharge capacity of 938.3 mAh/g at 0.5 C with 90.1% retention after 140 cycles. Moreover, the assembled pouch cell can easily drive a small fan when bent, confirming its potential for flexible energy-storage applications.
  • LI Yuanyuan, WU Jipeng, LIU Chaohui, QIAN Zhenyang, XIE Qiangsheng
    Chinese Journal of Power Sources. 2026, 50(8): 1435-1440. https://doi.org/10.3969/j.issn.1002-087X.2026.08.005
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    To address the bottleneck of insufficient insertion kinetics of graphite anodes for fast charging, this study achieves the 8 C fast-charging target through collaborative design of coke material selection, grinding, granulation, and soft carbon coating. Isotropic petroleum coke and anisotropic needle coke were selected and ground to 7.5 and 6.5 μm, respectively, to balance the kinetics of lithium-ion intercalation and diffusion between graphite layers. Subsequently, granulation and soft carbon coating were employed to further improve insertion kinetics. For the graphite design using petroleum coke with granulation and coating after graphitization (2.5% coating amount), soft carbon connections between primary particles resulted in low charge transfer impedance and small diffusion impedance, indicating excellent kinetic performance. However, its high-temperature storage and high-temperature cycling performance were poor. The design using petroleum coke with granulation before graphitization and coating after graphitization (1.8% coating amount) demonstrated superior high-temperature storage performance, but its charge transfer impedance and diffusion impedance were high, leading to suboptimal kinetic performance. The design using needle coke with granulation before graphitization and coating after graphitization (1.8% coating amount) achieved the best overall performance in terms of kinetics, storage, and cycling. When the capacity retention rate decayed to 80%, the fast-charging cycling and high-temperature cycling trends reached 4 000 and 1 500 cycles, respectively. This study provides design insights for the development of graphite materials for 8 C and higher-rate fast charging.
  • XU Yan, LIN Shuang, XU Jiamin, WU Tao, CAI Xia
    Chinese Journal of Power Sources. 2026, 50(8): 1441-1445. https://doi.org/10.3969/j.issn.1002-087X.2026.08.006
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    The LMFP and NCM were mixed and used as the cathode active material, and the orthogonal experiment method was adopted to conduct the research on the cathode formula of the compound battery. Nine cathodes formulations of the orthogonal table were processed, it was found that due to the large specific surface area of LMFP, the homogenization process required an increased stirring intensity and longer stirring time. Moreover, the higher the content of LMFP, the lower the solid content of the slurry, and the lower the maximum compaction density of the electrode sheet. 60 cycle tests were conducted on nine types of soft-pack batteries. The results show that when the LMFP∶NCM in the cathode formula is 2∶8, the PVDF addition amount is 2.5%, and the CNT addition amount is 1%, the battery had the best cycle performance. Samples of batteries were prepared using the best cathode formulation. The results show that when the specific energy is 240 Wh/kg, the composite battery is not suitable for high-rate discharging above 3 C. After 500 cycles, the capacity retention rate of the battery is 90.12%, the battery demonstrates excellent cycling performance.
  • WANG Yanhua, HUANG Sujie, HU Xinfa, YANG Wei
    Chinese Journal of Power Sources. 2026, 50(8): 1446-1452. https://doi.org/10.3969/j.issn.1002-087X.2026.08.007
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    To address the issues of insufficient slurry stability and fluctuating electrochemical performance caused by poor compatibility between CMC and SBR in aqueous graphite anode slurries, this study compared the effects of different CMC/SBR combinations on slurry dispersibility, electrode structure, and electrochemical performance through controlled experiments and process scale-up. The results show that the combination of Daicel 2200CMC and ZEON 451B (2200@451B-2) performed best, with a first-cycle specific capacity of 352.6 mAh/g in half-cell tests and capacity retention remaining stable at over 80% after 500 cycles. In pouch full-cell tests, its performance was comparable to that of the PVDF system, while exhibiting the fastest lithium-ion migration rate, lowest impedance, and densest SEI film. The system maintained excellent performance even after process scaling, demonstrating optimal compatibility and industrial scalability.
  • CUI Bofan, LIU Shuxi, LI Yu, ZHANG Zhiguo, FENG Fei
    Chinese Journal of Power Sources. 2026, 50(8): 1453-1461. https://doi.org/10.3969/j.issn.1002-087X.2026.08.008
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    A terminal voltage tolerance self-healing method based on current matching was proposed to address voltage inconsistency, incomplete charging, and accelerated capacity degradation in lithium battery packs after passive balancing. By real-time monitoring of balancing signals, the charging loop duty cycle was dynamically adjusted to precisely match the average charging current with the balancing branch’s dissipation current. Experimental results indicate that this method overcame the voltage divergence defect typical of traditional protection boards. It achieved cell voltage convergence at the end of charging (difference < 30 mV) and ensured all cells reached a full charge state. This solution effectively enhances the available capacity and lifespan of the battery pack, achieves life consistency between the pack and individual cells, and is verified by an experimental prototype.
  • LIU Bowen, YANG Fang, FU Yunzhun, HANG En
    Chinese Journal of Power Sources. 2026, 50(8): 1462-1468. https://doi.org/10.3969/j.issn.1002-087X.2026.08.009
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    Based on the porous electrode theory and laws of heat transfer, a comprehensive model coupling a pseudo-two-dimensional (P2D) electrochemical model with a 3D thermal model was developed for the INR21700M50L lithium-ion battery. The model's accuracy in predicting terminal voltage and surface temperature rise was validated through multi-rate discharge experiments. Sensitivity analysis was systematically conducted to evaluate the effects of key parameters—including electrode particle radii, electrical conductivities, and initial electrolyte concentration—on voltage characteristics and thermal behavior. The results indicate that the particle radii of both electrodes significantly influence voltage polarization, and reducing particle size effectively elevates the voltage plateau. Thermally, the positive electrode particle radius is the dominant driver of temperature rise, as larger sizes exacerbate diffusion limitations and irreversible heat generation, whereas solid-phase conductivity shows negligible impact. Analysis of variance (ANOVA) further confirms that the positive electrode particle radius contributes 91.35% to temperature inhomogeneity,with a range of 1.783 ℃. Finally, an optimal parameter combination for thermal distribution was determined using the Taguchi orthogonal method, providing theoretical support for the electrode structure design of high-energy-density battery packs.
  • SHI Jintao, ZHAO Jinhui, CHEN Hui, DENG Chao, LI Qian
    Chinese Journal of Power Sources. 2026, 50(8): 1469-1475. https://doi.org/10.3969/j.issn.1002-087X.2026.08.010
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    Large-capacity lithium iron phosphate (LFP) batteries have been widely deployed in the energy storage industry, where safety and thermal runaway risks have attracted extensive research attention. An early warning method was proposed for thermal runaway in battery modules based on online strain monitoring. Through experiments conducted on individual cells and modules under mechanical, electrical, and thermal abuse conditions, conducted in accordance with GB/T 36276-2025 and UL 9540A standards, the dynamic evolution of voltage, temperature, and strain signals during thermal runaway was investigated. The results show that strain signals can provide warnings hundreds to thousands of seconds before thermal runaway occurs, significantly earlier than temperature and voltage signals. Based on characteristics such as strain rate and inflection points, a multi-dimensional hierarchical criterion was established, enabling staged warning throughout the entire thermal runaway process. The physical correlation between strain signals and internal battery mechanisms—such as gas generation, separator failure, and side reactions—was also revealed. Compared with existing studies, this research is the first to propose a multi-dimensional strain-based criterion specifically for large-capacity LFP energy storage battery modules, highlighting its potential coupling with internal reaction mechanisms. The proposed method offers advantages including substantial warning lead time, low cost, and ease of integration, providing a new approach for the intrinsic safety design of energy storage systems.
  • ZHAO Ruiyang, YANG Ruilin, HU Yucheng, ZHANG Hangkai, SUN Jinlei
    Chinese Journal of Power Sources. 2026, 50(8): 1476-1485. https://doi.org/10.3969/j.issn.1002-087X.2026.08.011
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    Lithium-ion batteries are widely used in mobile electronic devices, electric vehicles, energy storage and other fields due to their advantages such as high energy density, long cycle life and no memory effect. Temperature is an important parameter that affects the performance of lithium-ion batteries. However, in practical applications, it is impossible for temperature sensors to cover every battery due to the constraints of hardware configuration conditions. To solve the problem of temperature monitoring, a temperature estimation method is proposed for lithium-ion batteries based on the analysis of Electrochemical Impedance Spectroscopy (EIS). Firstly, the impedance at the characteristic frequency used to characterize the battery temperature is extracted by analyzing the correlation between EIS features and temperature. Then, the temperature estimation model is established by using the Extreme Gradient Boosting (XGBoost) algorithm, and the hyperparameters are globally adaptively optimized through the Dung Beetle Optimizer (DBO) algorithm. It effectively enhanced the fitting accuracy and generalization ability of the model. Finally, the proposed temperature estimation model was verified and compared with other methods using the same dataset. The average estimation error of the lithium-ion battery temperature estimation method proposed can reach 1.21%.
  • LIU Suzhen, DU Zhaokang, SONG Guangcheng, XU Zhicheng, JIN Liang
    Chinese Journal of Power Sources. 2026, 50(8): 1486-1493. https://doi.org/10.3969/j.issn.1002-087X.2026.08.012
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    In response to the challenges posed by an imperfect ultrasonic characterization system and the strong coupling between high-dimensional features and network parameters in lithium battery state-of-energy (SOE) estimation, a collaborative estimation model that integrates the Harris Hawks Optimization (HHO) algorithm with a convolutional neural network-long short-term memory network (CNN-LSTM) was proposed. The proposed method systematically extracts ultrasonic features in the time domain, frequency domain, and time-frequency domain, thereby establishing a comprehensive multi-domain feature representation framework. Through the CNN layers, local feature correlations are effectively captured, while the LSTM layers are employed to model the temporal dynamics of SOE evolution. To enhance the alignment between extracted features and network architecture, the HHO algorithm is utilized to simultaneously and cooperatively optimize feature weights and key hyperparameters, enabling adaptive integration of feature representation learning and model configuration. Experimental results demonstrate that the proposed model achieves a mean absolute error (MAE) of less than 1.5% and a root mean square error (RMSE) below 1.3% within the discharge rate range of 0.8 C to 2.0 C. Furthermore, the model maintains robust performance under dynamic operating conditions, confirming its feasibility and practical applicability in engineering contexts.
  • XU Kunying, ZHAO Li, WAN Nan, ZHANG Dongye
    Chinese Journal of Power Sources. 2026, 50(8): 1494-1504. https://doi.org/10.3969/j.issn.1002-087X.2026.08.013
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    Currently, data-driven battery state-of-health estimation faces increasingly prominent accuracy limitations under real-vehicle service conditions due to strong background noise and non-equidistant sampling. To address this issue, a power battery capacity prediction framework integrating cascaded feature engineering and an improved Mamba model was proposed. It adopted a back-causal sliding window filtering algorithm to smooth capacity labels, reducing raw data fluctuations without information leakage. A cascaded screening mechanism was established via composite statistical correlation analysis and LightGBM split gain to identify key aging feature subsets. The Mamba architecture was optimized by introducing deep causal convolutions and numerical stability constraints, enhancing temporal dynamic feature capture capability. Experimental validation on real-vehicle service data shows that the framework achieves a coefficient of determination (R2) of 0.993 and a root mean square error of 0.509 Ah, outperforming benchmarks like Transformer and TimesNet. It provides a methodological reference for battery health assessment under complex conditions.
  • SHI Yifan, ZHANG Zhe, JIN Jie, LIU Yuan, LI Hengchang, DING Fei
    Chinese Journal of Power Sources. 2026, 50(8): 1505-1513. https://doi.org/10.3969/j.issn.1002-087X.2026.08.014
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    When energy storage batteries operate in coordinated mode with virtual synchronous generator (VSG) systems, the coupling characteristic between their state of charge (SOC) and the fluctuations of grid voltage phase and frequency is prone to inducing power-frequency oscillation and inrush current issues. Meanwhile, the insufficient coordination between the charging/discharging behavior of energy storage batteries and VSG control strategies may lead to overcharging and over-discharging of batteries, which restricts the system performance and the cycle life of batteries. To address these problems, an SOC optimization strategy is proposed for energy storage batteries based on VSG coordinated control, which takes precise SOC regulation as the core objective to establish a collaborative mechanism between power-frequency characteristic optimization and SOC stability control. Simulation results based on the MATLAB/Simulink platform show that the proposed strategy improves the SOC overshoot suppression effect of energy storage batteries by approximately 40% and enhances the system frequency modulation response speed by about 60%. It effectively solves the technical challenge of collaborative control between the dynamic SOC optimization of energy storage batteries and power-frequency stability in VSG systems, providing technical reference for the efficient and long-life application of energy storage batteries in VSG systems.
  • CHEN Tianhao, GENG Mengmeng, GAO Jie, LYU Yan
    Chinese Journal of Power Sources. 2026, 50(8): 1514-1522. https://doi.org/10.3969/j.issn.1002-087X.2026.08.015
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    The unique physicochemical properties inside lithium-ion batteries and their diverse service conditions both impose stringent requirements on the detection and evaluation of their operating states. Among these, the State of Charge (SOC), as one of the key indicators, is crucial for ensuring the reliability and stability of lithium-ion batteries. Ultrasonic guided wave testing technology was employed to experimentally analyze the intrinsic relationship between the SOC of lithium-ion batteries and the propagation characteristics of guided waves under different operating conditions. Firstly, based on the transfer matrix and Biot's theory, a theoretical model for the propagation characteristics of ultrasonic guided waves in multi-layered porous lithium-ion batteries was established, interpreting the propagation mechanism of acoustic fields inside the battery. Subsequently, an ultrasonic guided wave experimental testing system was built. The effects of different discharge rates (0.75 C、1 C、1.25 C) and ambient temperatures (0, 10, 20 ℃) on the time-domain characteristics (signal amplitude and transit time) of guided waves in batteries were investigated, revealing the variation laws of the above characteristic parameters with the battery's SOC. On this basis, the influence of lithium plating phenomenon under low-temperature conditions on the propagation characteristics of guided waves was further analyzed. Through the changes in the time-domain characteristics of guided waves before and after charging, the feasibility of detecting internal state changes of lithium-ion batteries via acoustic methods was verified.
  • LIANG Qinqin, LI Jianxin, QIN Qi, LI Dandan, HAN Fangyuan, LUO Zongchang, TANG Bin, YU Min
    Chinese Journal of Power Sources. 2026, 50(8): 1523-1530. https://doi.org/10.3969/j.issn.1002-087X.2026.08.016
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    The small interlayer spacing of graphite anodes in sodium-ion batteries makes it difficult to achieve efficient sodium storage, suffering from low initial Coulombic efficiency and capacity. This work synthesized a novel bimetallic transition metal sulfide, Cu₃NbS₄, which exhibits an ordered polycrystalline structure with relatively uniform particle size and homogeneous distribution of Cu, Nb, and S elements. The Cu3NbS4 electrode delivered a discharge capacity of 473.5 mAh/g at 0.2 A/g with a first-cycle Coulombic efficiency of 93.22%. Even at a high current density of 10 A/g, it maintained a discharge capacity of 270 mAh/g, demonstrating outstanding rate capability. After 500 cycles at 1 A/g, the capacity remained above 470 mAh/g with Coulombic efficiency approaching 100%. The exceptional overall performance of Cu3NbS4 is attributed to its rapid electron/ion transport kinetics, favorable redox reversibility, and distinct pseudocapacitive behavior.
  • GAO Yan, ZHANG Xin, WANG Hongyan, ZHAO Yuze, SI Qingsudu, CHANG Qiming, WEN Yanliang, HONG Mingzi
    Chinese Journal of Power Sources. 2026, 50(8): 1531-1541. https://doi.org/10.3969/j.issn.1002-087X.2026.08.017
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    Phenolic resin-based hard carbon materials have become one of the ideal candidates for anode materials in sodium-ion batteries due to their excellent sodium storage capacity. However, their large-scale application is restricted by low electronic conductivity, poor cycling stability, and low initial Coulombic efficiency. A soft-hard carbon composite material was successfully prepared by coating asphalt soft carbon on the surface of phenolic resin hard carbon through a pre-oxidation process. This material exhibited a reversible specific capacity as high as 346.7 mAh/g, an initial Coulombic efficiency of 75.18%, and could still maintain a reversible specific capacity of 257.6 mAh/g after 100 cycles. The excellent electrochemical performance of this material is attributed to the introduction of the asphalt soft carbon coating, which effectively isolates the direct contact between the electrolyte and the hard carbon material, while the introduction of oxygen atoms provides more reactive sites. An innovative synthesis method for preparing high-performance carbon-based negative electrode materials for sodium-ion batteries was proposed, and a potential precursor design concept was also provided.
  • ZHAO Meixin, ZHANG Hongjie, WANG Manli, WANG Jianying, HAO Jinkai, SUN Shucheng, SHAO Zhigang
    Chinese Journal of Power Sources. 2026, 50(8): 1542-1551. https://doi.org/10.3969/j.issn.1002-087X.2026.08.018
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    PtCo alloy catalysts supported on mesoporous carbon were successfully prepared using a “co-reduction method”. During the annealing process, the transition metal Co forms Co-C bonds with the support, lowering the energy barrier for C-C bond rearrangement, which promotes the orderly arrangement of carbon atoms, enhances the degree of graphitization in the carbon material, and significantly improves the conductivity and stability of the carbon support. Meanwhile, the Co element in the alloy adjusts the Pt d-band center, weakening the adsorption energy of oxygen intermediates and enhancing the kinetics of the oxygen reduction reaction (ORR). The resulting catalyst exhibits a mass activity of 617.7 A/g, showing excellent activity and high-temperature stability. The open-circuit voltage of the medium-temperature fuel cell is 0.953 V, and after accelerated degradation testing, it still demonstrates high single-cell performance.
  • YAO Zhibin, FENG Wei, ZHAO Lingying, MA Guoqiang
    Chinese Journal of Power Sources. 2026, 50(8): 1552-1560. https://doi.org/10.3969/j.issn.1002-087X.2026.08.019
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    To improve the output performance, mass transfer and water management capacity of proton exchange membrane fuel cells (PEMFCs), a Y-shaped honeycomb bionic flow field structure is proposed to address the drawbacks of conventional parallel and serpentine flow fields, including uneven reactant distribution, excessive pressure drop and severe liquid water accumulation. A three-dimensional steady-state multiphase numerical model is established, which comprehensively accounts for gas flow, electrochemical reactions, heat and mass transfer, multi-component transport, as well as gas-liquid two-phase water migration. The polarization characteristics, power density, flow velocity and pressure distribution, oxygen mass fraction, current density and liquid water distribution of the Y-shaped honeycomb bionic flow field are systematically compared with those of parallel and serpentine flow fields. The results reveal that the Y-shaped honeycomb bionic flow field delivers superior comprehensive performance under medium-to-high current density operating conditions, with a peak power density of 0.65 W/cm², approximately 44.4% and 10.2% higher than that of the parallel and serpentine flow fields, respectively. Furthermore, the proposed flow field structure effectively homogenizes the distribution of reactive gases, reduces the overall pressure drop, alleviates local oxygen starvation and concentrated current density, and facilitates uniform distribution and timely removal of liquid water. The Y-shaped honeycomb bionic flow field exhibits promising application prospects for boosting the output performance and operational stability of PEMFCs.
  • LI Xiaoqian, LV Linna, LU Bo, WANG Peiqiao, LI Weiqing, LI Xuehai
    Chinese Journal of Power Sources. 2026, 50(8): 1561-1566. https://doi.org/10.3969/j.issn.1002-087X.2026.08.020
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    The fluid distribution uniformity of the cell stack has a crucial impact on the performance of Al/AgO battery. The CFD method was employed to analyze the effects of the branch pipe spacing, the design flow rate of each cell, the height of the cell distribution channel, and the size of the main pipe cross-section on the fluid distribution uniformity. The results demonstrate that the branch pipe spacing has a minor influence on the fluid distribution uniformity. Although reducing the design flow rate and channel height improves distribution uniformity, it concurrently reduces unit flow rate and raises stack pressure loss. Increasing the main pipe’s cross-sectional area represents the most effective approach to enhance fluid distribution uniformity of the cell stack, as it simultaneously improves uniformity and lowers pressure loss.
  • DUAN Qizhi, NONG Yuchang, FAN Zhaobao, LIU Meimei, QIAO Shaoming
    Chinese Journal of Power Sources. 2026, 50(8): 1567-1572. https://doi.org/10.3969/j.issn.1002-087X.2026.08.021
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    Concurrent operation of thermal batteries with ground power sources is a common scenario in practical applications. The output characteristics of electrical energy when thermal batteries and ground power sources supply power simultaneously in different systems were studied. Focusing on both the power output capability and stability, as well as the safety and reliability of the thermal batteries under such conditions. Experiments were conducted using the Li(Si)/FeS2 system. The results show that when the ground power supply voltage exceeds that of the thermal battery, a reverse current flows through the thermal battery during concurrent operation. Conversely, when the ground power supply voltage is lower, the supply current is gradually taken over by the thermal battery according to the voltage difference. Furthermore, the overlapping power supply process does not compromise the safety or reliability of the thermal battery. In addition, changing the research system to the currently commonly used Li(B)/CoS2 (FeS2/CoS2 composite cathode, FeS2/CoS2/NiS2 ternary composite cathode) three systems still conform to the above-mentioned results, indicating that the above conclusions have general applicability. This study confirms that thermal batteries can deliver electrical energy to the equipment in a stable and reliable manner after overlapping power supply.
  • Research and design: Physical power sources
  • LV Zhaochen, XIONG Qiaopo, WAN Ronghua, LIU Qing, LI Mao, NI Wang, HAN Lin, YU Zhihang, LIU Xingjiang
    Chinese Journal of Power Sources. 2026, 50(8): 1573-1579. https://doi.org/10.3969/j.issn.1002-087X.2026.08.022
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    The 1 μm lattice-mismatched laser power converter (LPC) on GaAs substrate serves as a key enabler for long-range laser wireless power transmission. By implementing a graded buffer layer to grow AlGaInAs multilayers with compositional-graded indium, the high lattice mismatch between InGaAs absorber and GaAs substrate was mitigated. This approach facilitated a dual-junction LPC on GaAs, demonstrating at 0.7 W optical input (room temperature, 1 cm² illumination area): 46.83% power conversion efficiency, 1.36 V output, and 82.8% fill factor at maximum power point.