Capacity fading failure analysis of Li-S pouch cell

YANG Xingyu; ZHANG Tao; GAO Wenchao; LIU Yanxia

doi:10.3969/j.issn.1002-087X.2024.04.010

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Chinese Journal of Power Sources ›› 2024, Vol. 48 ›› Issue (4) : 628-633. DOI: 10.3969/j.issn.1002-087X.2024.04.010

Research and design: Chemicalpower sources

Capacity fading failure analysis of Li-S pouch cell

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Abstract

An in-situ and ex-situ method was used to analysis the cyclic failure capacity of lithium-sulfur pouch cell quantificationally, including reversible and irreversible capacity loss. Reversible capacity loss are mainly caused by current polarization, electrolyte loss and electrode expansion, while irreversible capacity loss mainly consists of lithium sulfide deposition on negative electrode, polysulfide adhesion on separator and electrolyte dissolution, etc. According to calculation and comparison, the main factors caused cycle failure of lithium-sulfur pouch cell are lithium sulfide deposition and pulverization of lithium metal anode accounting for about 47%, meanwhile polysulfide adhesion on separator accounting for about 25% secondly. Therefore, it is necessary to focus on analysis and improvement of major factors, so as to improve the cycle performance and practical process of lithium-sulfur battery.

Key words

Li-S pouch cell / failure analysis / capacity fading / quantificational decomposition

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YANG Xingyu, ZHANG Tao, GAO Wenchao, et al. Capacity fading failure analysis of Li-S pouch cell[J]. Chinese Journal of Power Sources, 2024, 48(4): 628-633 https://doi.org/10.3969/j.issn.1002-087X.2024.04.010

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