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Interfacial modification between argyrodite-type solid-state electrolytes and Li metal anodes using LiPON interlayers
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2022-08-03 , DOI: 10.1039/d2ee01390h
Jin Su , Mauro Pasta , Ziyang Ning , Xiangwen Gao , Peter G. Bruce , Chris Grovenor

Solid-state batteries (SSBs) using lithium (Li) metal anodes and solid-state electrolytes (SSEs) can offer both improved energy densities and, by removing flammable liquid electrolytes, improved safety. The argyrodite-type Li6PS5Cl ceramic is an attractive candidate SSE material because of its high ionic conductivity (>1 mS cm−1) at room temperature and relatively ductile mechanical properties. However, interface contact issues between the SSE and Li metal hamper the practical development of solid-state Li metal batteries. In this work, we show that the interfacial resistance between the Li6PS5Cl SSE and Li metal anode can be reduced to as low as 1.3 Ω cm2 in symmetric cells by introducing a thin amorphous and Li-ion conducting lithium phosphorus oxynitride (LiPON) interlayer. We demonstrate that this interlayer improves the wetting behaviour of the Li6PS5Cl SSE, and helps form an effective conformal interfacial contact between the Li6PS5Cl SSE and Li metal. LiPON coated Li6PS5Cl symmetric cells with reduced interfacial resistance exhibit stable Li plating/stripping cycling for over 1000 h at 0.5 mA cm−2, and a dramatically improved critical current density of 4.1 mA cm−2 at 30 °C. These results demonstrate a reliable thin-film coating strategy for improving contact between the SSEs and Li metal anodes, stabilizing interfaces and realizing the practical application of solid-state Li metal batteries.

中文翻译:

使用 LiPON 中间层对银汞石型固态电解质和锂金属负极进行界面改性

使用锂 (Li) 金属阳极和固态电解质 (SSE) 的固态电池 (SSB) 既可以提供更高的能量密度,又可以通过去除易燃液体电解质来提高安全性。菱沸石型 Li 6 PS 5 Cl 陶瓷是一种有吸引力的候选 SSE 材料,因为它在室温下具有高离子电导率(>1 mS cm -1 )和相对延展的机械性能。然而,SSE 和锂金属之间的界面接触问题阻碍了固态锂金属电池的实际发展。在这项工作中,我们表明 Li 6 PS 5 Cl SSE 和锂金属负极之间的界面电阻可以降低至 1.3 Ω cm 2通过引入薄的非晶态和锂离子导电锂磷氧氮化物 (LiPON) 中间层,在对称电池中实现了这一目标。我们证明该中间层改善了 Li 6 PS 5 Cl SSE 的润湿行为,并有助于在 Li 6 PS 5 Cl SSE 和 Li 金属之间形成有效的共形界面接触。具有降低界面电阻的LiPON 涂层 Li 6 PS 5 Cl 对称电池在 0.5 mA cm -2下表现出稳定的锂电镀/剥离循环超过 1000 小时,并且临界电流密度显着提高至 4.1 mA cm -2在 30 °C。这些结果证明了一种可靠的薄膜涂层策略,可以改善 SSE 和锂金属负极之间的接触,稳定界面并实现固态锂金属电池的实际应用。
更新日期:2022-08-03
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