How Metallic Protection Layers Extend the Lifetime of NASICON-Based Solid-State Lithium Batteries
How Metallic Protection Layers Extend the Lifetime of NASICON-Based Solid-State Lithium Batteries
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DOI：
10.1149/2.0032005jes
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发表时间：
2019-10-11
影响因子：
3.9
通讯作者：
McDowell, Matthew T.
中科院分区：
文献类型：
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作者：
Cortes, Francisco Javier Quintero;Lewis, John A.;McDowell, Matthew T.
在电池中使用固态电解质（SSE）是安全获得锂金属阳极高容量的一种有前途的策略。然而，大多数具有实际离子导电性的SSE在与锂金属接触时是化学不稳定的，这对电池性能是不利的。磷酸铝锗锂（LAGP）是一种具有高离子电导率（10（-4）-10（-3）S cm（-1））和良好环境稳定性的SSE，但它形成与Li接触时连续生长的非晶界面区，导致固态电池内的化学机械故障。在这里，我们发现，薄（类似于30 nm）的铬中间层之间的锂电极和LAGP之间的沉积延长循环寿命超过1000小时，在中等电流密度（0.1-0.2 mA cm（-2）），相比类似于30小时没有保护。这种显著改善的稳定性是因为金属夹层改变了界面相形成的轨迹和界面处电化学反应的性质。这项工作显示了固态电池中各种SSE材料的界面工程的前景，同时强调了了解保护层如何影响界面动态演变的必要性。(C)作者（S）2019由ECS发布。
The use of solid-state electrolytes (SSEs) within batteries is a promising strategy to safely access the high capacity of lithium metal anodes. However, most SSEs with practical ionic conductivity are chemically unstable in contact with lithium metal, which is detrimental to battery performance. Lithium aluminum germanium phosphate (LAGP) is an SSE with high ionic conductivity (10(-4)-10(-3) S cm(-1)) and good environmental stability, but it forms an amorphous interphase region that continuously grows in contact with Li, leading to chemo-mechanical failure within solid-state batteries. Here, we find that thin (similar to 30 nm) chromium interlayers deposited between the lithium electrode and LAGP extend cycle life to over 1000 h at moderate current densities (0.1-0.2 mA cm(-2)), compared to similar to 30 h without protection. This significantly improved stability occurs because the metallic interlayer alters the trajectory of interphase formation and the nature of the electrochemical reaction at the interface. This work shows the promise of interface engineering for a variety of SSE materials within solid-state batteries, while emphasizing the necessity of understanding how protection layers affect dynamic evolution of interfaces. (C) The Author(s) 2019. Published by ECS.