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一个表面非破坏性修改策略,解决硫化物固态电解质的水分和氧化不稳定性

Yicheng Deng¹, Guo Tang¹, Gengzhong Lin¹

¹Hubei Key Lab of Electrochemical Power Sources, College of Chemistry & Molecular Science, Wuhan University, Wuhan, 430072, China.

Angewandte Chemie (International ed. in English)

|December 29, 2025

概括

研究人员开发了硫化物固体电解质的新表面修饰,提高了它们对氧化和水分的稳定性. 这一突破改善了全固态电池的性能和寿命.

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
电池技术电池技术

背景情况:

硫化物固体电解质为全固态电池 (ASSB) 提供高离子导电性.
它们的实际用途受到氧化稳定性差和对水分敏感性的限制.
现有的修改方法往往需要破坏性过程.

研究的目的:

为Li$_{6}$PS$_{5}$Cl (LPSC) 固体电解质开发一个现场,非破坏性的表面修饰策略.
为了提高LPSC的耐湿性和氧化稳定性.
提高ASSB的电化学性能和循环稳定性.

主要方法:

在LPSC表面利用核性S$^{2-}$离子,启动乙烯硫酸盐 (DTD) 的环开聚合.
在LPSC上形成了一个均而密集的聚硫酸盐 (PS) 保护层.
使用改性PS-LPSC电解质,高阴极 (NCM955) 和LiIn阳极制造的ASSB.

主要成果:

该PS修改层有效地保护LPSC免受潮湿和高压阴极的影响.
在室温下,ASSB显示出高容量 (例如,在1°C时208.1mA hg^{-1}$).
实现了特殊的长期循环稳定性,在10°C的36000个循环后保持了70.0%的容量,在高温的20,000个循环后保持了62.4%.

结论:

拟议的现场聚合策略为硫化物固体电解质的表面修饰提供了一条有效的途径.
PS-LPSC电解质显著增强了水分和氧化稳定性.
这种方法证明了开发实用且耐用的全固态电池的巨大潜力.

关键词:

所有固态电池都是固态电池.接口稳定性接口稳定性耐湿性耐湿性耐湿性耐湿性硫化物固体电解质硫化物固体电解质表面的修改是表面的修改.

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