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A more stable lithium anode by mechanical constriction for solid state batteries
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2020/01/22 , DOI: 10.1039/c9ee04007b
Yibo Su 1, 2, 3, 4 , Luhan Ye 1, 2, 3, 4 , William Fitzhugh 1, 2, 3, 4 , Yichao Wang 1, 2, 3, 4 , Eva Gil-González 1, 2, 3, 4 , In Kim 1, 2, 3, 4 , Xin Li 1, 2, 3, 4
Affiliation  

In solid state batteries, lithium dendrites form when the applied current density is higher than a critical value. The critical current density is often reported as 1–2 mA cm−2 at an external pressure of around 10 MPa. In this work, a more advanced mechanical constriction technique is applied on a solid-state battery constructed with Li10GeP2S12 (LGPS) as the electrolyte and a lithium metal/graphite composite as the anode, where the graphite layer was applied to prevent (electro-)chemical reactions between Li metal and LGPS, as well as a short-circuit upon the application of pressure. The decomposition pathway of LGPS at the anode interface is modified by this mechanical constriction design, and the growth of lithium dendrites is inhibited, leading to excellent rate and cycling performances. No short-circuit or lithium dendrite formation is observed for batteries cycled at a current density up to 10 mA cm−2.

中文翻译:

通过机械收缩获得的用于固态电池的更稳定的锂阳极

在固态电池中,当施加的电流密度高于临界值时,会形成锂枝晶。在大约10 MPa的外部压力下,临界电流密度通常报告为1-2 mA cm -2。在这项工作中,将更先进的机械收缩技术应用于使用Li 10 GeP 2 S 12构成的固态电池(LGPS)作为电解质,锂金属/石墨复合材料作为阳极,在石墨层上施加了石墨,以防止Li金属与LGPS之间的(电)化学反应,以及在施加压力时发生短路。通过这种机械收缩设计可以改变LGPS在阳极界面处的分解途径,并抑制锂树枝状晶体的生长,从而获得优异的速率和循环性能。对于以高达10mA cm -2的电流密度循环的电池,未观察到短路或锂枝晶形成。
更新日期:2020-03-19
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