Rate-dependent deformation of amorphous sulfide glass electrolytes for solid-state batteries
Rate-dependent deformation of amorphous sulfide glass electrolytes for solid-state batteries
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用于固态电池的非晶硫化物玻璃电解质的速率相关变形
DOI：
10.1016/j.xcrp.2022.100845
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发表时间：
2022
影响因子：
8.9
通讯作者：
Gao, Huajian
中科院分区：
文献类型：
--
作者：
Athanasiou, Christos E.;Liu, Xing;Jin, Mok Yun;Nimon, Eugene;Visco, Steve;Lee, Cholho;Park, Myounggu;Yun, Junnyeong;Padture, Nitin P.;Gao, Huajian
硫化物玻璃正在成为固态电池的潜在电解液。这些材料的力学行为会显著影响电池的性能，因此了解它们的变形和断裂机制是非常必要的。以往的工作主要报道了在准静态加载条件下获得的特性，而对动态条件下的变形知之甚少。目前的研究表明，硫化物玻璃的力学行为以粘塑性为主，与多晶氧化物和硫化物固体电解质有很大的不同。有限元模拟表明，硫化物玻璃的刚度足够高，可以在中等堆压下与较软的锂金属电极保持良好的接触。观察到的粘塑性还表明，电池的工作条件将在与树枝状锂渗透相关的电化学-机械过程中发挥重要作用。总的来说，本文记录的硫化物玻璃电解液的速率相关机械行为为设计下一代全固态电池提供了一个新的维度。
Sulfide glasses are emerging as potential electrolytes for solid-state batteries. The mechanical behavior of these materials can significantly impact cell performance, and it is thus imperative to understand their deformation and fracture mechanisms. Previous work mainly reports properties obtained under quasi-static loading conditions, but very little is known about deformation under dynamic conditions. The current investigation shows that the sulfide glass mechanical behavior is dominated by viscoplasticity, differing substantially from polycrystalline oxide and sulfide solid electrolytes. Finite element modeling indicates that the sulfide glass stiffness is high enough to maintain good contact with softer lithium metal electrodes under moderate stack pressures. The observed viscoplasticity also implies that battery operating conditions will play an important role in electro-chemo-mechanical processes that are associated with dendritic lithium penetration. In general, the rate-dependent mechanical behavior of the sulfide glass electrolytes documented here offers a new dimension for designing next-generation all-solid-state batteries.
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