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实现使用Li_6+xM_xAs_1-xS₅I (M=Si,Sn) 硫化物固体电解质的长周期全固态Li-In蓄电池

Pushun Lu^1,2, Yu Xia³, Guochen Sun^1,2

¹Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.

Nature communications

|July 10, 2023

概括

新的硫化物固体电解质,Li_6+xM_xAs_1-xS₅I,为所有固态电池提供了更好的稳定性. 这些先进的材料表现出卓越的循环寿命和功率性能,为下一代能源存储铺平了道路.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
固态化学固态化学

背景情况:

无机硫化物固态电解质如Li6PS5X表现出高离子导电性和低成本,使它们成为所有固态电池的前景.
然而,目前的硫化物电解质面临着空气稳定性和与分层氧化物阴极的兼容性方面的挑战.

研究的目的:

开发具有增强结构和化学稳定的新型硫化物固体电解质.
解决现有的硫化物电解质在实用的全固态电池应用中的局限性.

主要方法:

新的Li_6+xM_xAs_1-xS₅I (M=Si, Sn) 硫化物固体电解质的合成和表征.
使用新型电解质,Li-In阳极和Ti₂S基阴极,制造和电化学测试离子Swagelok细胞.

主要成果:

电解质Li_6+xSi_xAs_1-xS₅I (x=0.8) 电解质表现出了显著的稳定性和性能.
实验室规模的细胞实现了近62,500个周期的循环寿命,在2.44 mA cm-2下.
这些电池还表现出良好的功率能力 (高达24.45 mA cm-2) 和9.26 mAh cm-2的面积容量在0.53 mA cm-2处.

结论:

拟议的Li6+xMxAs1-xS5I固体电解质对现有的硫化物电解质来说是一个显著的进步.
这些材料显示出开发稳定和高性能全固态电池的巨大潜力.

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