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富含化物硫化物固体电解质,具有超高的空气稳定性,用于全固态电池

Seungwoo Lee¹, Jeongheon Kim², Chang Hun Park²

¹Department of Energy Engineering, Hanyang University, Seoul, 04763, Republic of Korea.

Small (Weinheim an der Bergstrasse, Germany)

|February 21, 2025

概括

研究人员开发了一种新的固体电解质 (SE),具有富含的外,以增强大气稳定性. 这项创新提高了离子电池的性能,通过防止湿度暴露导致的退化.

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:

基于硫化物的固体电解质 (SE) 显示出由于其高离子导电性和可塑性,对固态电池具有前景.
由于与水分的反应引起的SE的不良大气稳定性,产生有毒的H2S气体并降低性能,阻碍了商业化.
石类型Li6PS5Cl (LPSCl) 是一个关键材料,但其对空气的敏感性仍然是一个挑战.

研究的目的:

为了提高Li6PS5Cl (LPSCl) 固体电解质的大气稳定性.
为了研究富含化物LPSCl外对水分的保护作用.
为了评估修改后的SE在全固态电池中的电化学性能和空气稳定性.

主要方法:

通过处理和化,用富含的LPSCl外制备LPSCl固体电解质.
将修改后的SE暴露在受控湿度 (20%RH在25°C) 中,以评估空气稳定性.
电化学表征,包括离子导电性,电子导电性和全细胞的循环性能.
第一原则密度功能理论 (DFT) 建模以了解增强空气稳定性的机制.

主要成果:

一种富含的新型LPSCl外有效地保护了LPSCl核心免受水分降解.
经过修改的SE即使在暴露于大气中,也保持了低电子导电性.
使用暴露在空气中的修改SE的全电池显示了改善的初始放电容量 (168.5 mAh g-1),出色的循环稳定性 (在0.3 C下超过500个循环),以及良好的速率能力.
DFT模型提供了对增强空气稳定机制的见解.

结论:

富含化物的LPSCl外显著提高了化固体电解质的大气稳定性.
这种表面修饰有效地抑制了与水分的副作用反应,保持了电化学性质.
开发的材料为商业化稳定和高性能全固态电池提供了一个有前途的途径.

关键词:

空气稳定性的空气稳定性所有固态电池都是固态电池.阿尔吉罗石是一种石.基于硫化物的电解质.

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