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Chemo-electrochemical Evolution of Cathode-Solid Electrolyte Interface in All-Solid-State Batteries
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DOI：10.1021/acsenergylett.4c02062.png)
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The stability of the interface between the cathode and the solid electrolyte (SE) has been found to be a key determinant of solid-state battery (SSB) performance. While interfacial failure from electrochemical cycling has been studied, temperature effects on the chemical and electrochemical evolution of interface properties are not well-understood. We utilize a dense additive-free LiCoO2 cathode, which provides controlled morphology and crystallography, and well-known high voltage halide SEs (Li3InCl6 and Li3YCl6) to eliminate the need for cathode coating to explore the nature of interface deterioration induced by operating at up to 100 degrees C. By promoting temperature-induced accelerated interfacial failure, we show that at elevated temperatures (>60 degrees C) and higher states of charge, a significant chemo-electrochemical contribution to interfacial resistance results in rapid cell performance degradation. Our findings show that beyond the well sought-after SE electrochemical voltage stability, the atomic-scale restructuring of the cathode surface interfaced with the SE must be considered when designing stable interfaces.
Keyword:
LI-ION BATTERIES
THERMAL-STABILITY
LITHIUM BATTERIES
CAPACITY FADE
LICOO2
COMPATIBILITY
LIXCOO2
期刊
IF:
18.2
论文数:
5.2K
被引数:
6.6W
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引用论文
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