Size-Dependent Chemomechanical Failure of Sulfide Solid Electrolyte Particles during Electrochemical Reaction with Lithium
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- Size-Dependent Chemomechanical Failure of Sulfide Solid Electrolyte Particles during Electrochemical Reaction with Lithium
- Zhao, Jun; Zhao, Chao; Zhu, Jianping; Liu, Xiangsi; Yao, Jingming; Wang, Bo; Dai, Qiushi; Wang, Zaifa; Chen, Jingzhao; Jia, Peng; Li, Yanshuai; Harris, Stephen J.; Yang, Yong; Tang, Yongfu; Zhang, Liqiang; Ding, Feng; Huang, Jianyu
- Issue Date
- AMER CHEMICAL SOC
- NANO LETTERS, v.22, no.1, pp.411 - 418
- The very high ionic conductivity of Li10GeP2S12 (LGPS) solid electrolyte (SE) makes it a promising candidate SE for solid-state batteries in electrical vehicles. However, chemo-mechanical failure, whose mechanism remains unclear, has plagued its widespread applications. Here, we report in situ imaging lithiation-induced failure of LGPS SE. We revealed a strong size effect in the chemomechanical failure of LGPS particles: namely, when the particle size is greater than 3 mu m, fracture/pulverization occurred; when the particle size is between 1 and 3 mu m, microcracks emerged; when the particle size is less than 1 mu m, no chemomechanical failure was observed. This strong size effect is interpreted by the interplay between elastic energy storage and dissipation. Our finding has important implications for the design of high-performance LGPS SE, for example, by reducing the particle size to less than 1 mu m the chemomechanical failure of LGPS SE can be mitigated.
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