Controlling dendrite propagation in solid-state batteries with engineered stress
Controlling dendrite propagation in solid-state batteries with engineered stress
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DOI：
10.1016/j.joule.2022.10.011
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发表时间：
2022-12-21
期刊：
影响因子：
39.8
通讯作者：
Chiang, Yet-Ming
中科院分区：
文献类型：
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作者：
Fincher, Cole D.;Athanasiou, Christos E.;Chiang, Yet-Ming
金属枝晶穿透是电解质失效的一种模式，其威胁基于金属阳极的固态电池的可行性。枝晶是由机械失效还是固体电解质的电化学降解驱动的，仍是一个悬而未决的问题。如果内部机械力驱动失效，则叠加抵抗内部应力的压缩载荷可以减轻枝晶穿透。在这里，我们调查这一假设，通过动态施加机械负荷，在Li6.6La3Zr1.6Ta0.4O12固体电解质中生长的枝晶。操作显微镜揭示了显着的偏转在压缩载荷的开始时的枝晶生长轨迹。对于足够的负载，这种偏转避免了电池失效。使用断裂力学，我们量化的堆叠压力和面内应力对枝晶轨迹的影响，图表所需的残余应力，以防止短路故障，并提出设计方法来实现这样的应力。对于这里研究的材料，我们表明，枝晶的传播是由电解质断裂，电子泄漏起着微不足道的作用。
Metal-dendrite penetration is a mode of electrolyte failure that threatens the viability of metal-anode-based solid-state batteries. Whether dendrites are driven by mechanical failure or electrochem-ical degradation of solid electrolytes remains an open question. If in-ternal mechanical forces drive failure, superimposing a compressive load that counters internal stress may mitigate dendrite penetra-tion. Here, we investigate this hypothesis by dynamically applying mechanical loads to growing dendrites in Li6.6La3Zr1.6Ta0.4O12 solid electrolytes. Operando microscopy reveals marked deflection in the dendrite growth trajectory at the onset of compressive loading. For sufficient loading, this deflection averts cell failure. Using fracture mechanics, we quantify the impact of stack pressure and in-plane stresses on dendrite trajectory, chart the residual stresses required to prevent short-circuit failure, and propose design approaches to achieve such stresses. For the materials studied here, we show that dendrite propagation is dictated by electrolyte fracture, with electronic leakage playing a negligible role.