Improvement of lithium-metal electrode performance of all-solid-state batteries by shot peening on solid-electrolyte surface
Improvement of lithium-metal electrode performance of all-solid-state batteries by shot peening on solid-electrolyte surface
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DOI：
10.1016/j.jpowsour.2022.231556
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发表时间：
2022-07
影响因子：
9.2
通讯作者：
M. Kodama;K. Takashima;S. Hirai
中科院分区：
文献类型：
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作者：
M. Kodama;K. Takashima;S. Hirai
采用氧化物固体电解质的全固态锂金属电池需要改进阳极界面电阻和临界电流密度，以获得合适的高性能电池。本研究采用喷丸法对氧化固体电解质进行表面处理。实验结果表明，喷丸强化使界面电阻降低到处理前的1/24，临界电流密度提高了7倍。这种性能的改进与传统的金薄膜插入方法所获得的性能相当。此外，喷丸强化和金薄膜插入之间存在协同效应：与单独使用任何一种方法相比，两种技术一起使用可以获得更低的界面电阻和更高的临界电流密度。表面结构和力学特性的测量结果表明了喷丸强化后电极性能提高的两个原因。一是喷丸强化引起的表面粗糙度增加了固体电解质与机械应力不均匀的锂金属之间的接触。二是喷丸强化通过施加残余压应力来提高断裂韧性，从而抑制锂枝晶的生长。
The anode interface resistance and the critical current density of an all-solid-state lithium metal battery with oxide solid electrolyte needs improvement to obtain a suitable high-performance battery. In this study, surface processing of an oxide solid electrolyte by shot peening is achieved. The experimental results show that shot peening decreases the interface resistance to 1/24 of the interface resistance before this treatment and increases the critical current density by a factor of 7. This improvement in performance is comparable to that obtained by the conventional gold thin-film insertion method. Moreover, there is a synergistic effect between shot peening and gold thin-film insertion: lower interface resistances and higher critical current densities are obtained when using the two techniques together than when either method is used alone. The results of measurements of surface structural and mechanical characteristics suggest two reasons for the increase in the electrode performance with shot peening. One is that the surface roughness caused by shot peening increases the contact between the solid electrolyte and the lithium metal with inhomogeneous mechanical stress. The other is that shot peening increases the fracture toughness by applying a compressive residual stress, thus suppressing the growth of lithium dendrite.