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在全固态硫电池中增强了电化学稳定性,其中包含 argyrodite 电解质

Yin-Ju Yen¹, Hyunki Sul¹, Arumugam Manthiram¹

¹Materials Science & Engineering Program and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, 78712, USA.

Small (Weinheim an der Bergstrasse, Germany)

|March 26, 2025

概括

与相配合的二氧化电解质在与相配合的变种相比,在全固态硫电池中提供了增强的稳定性和性能. 这种改进源于更广泛的电化学稳定性窗口,提高了电池循环性和容量保留.

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
储能储能储能储能储能储能

背景情况:

argyrodite电解质 (Li₆PS₅X) 是由于可加工性和成本,对于全固态硫电池 (ASSLSB) 的硫化物固体电解质材料 (SSEs) 是有前途的.
添加的氧化具有高离子导电性,但电化学稳定性有限,阻碍了ASSLSB的性能.
在工作电压窗口内的电解质分解是当前ASSLSB的关键问题.

研究的目的:

为了在ASSLSB中比较添加的氧化 (Li_5.5PS_4.5Br_1.5) 与添加的对应物 (Li_5.5PS_4.5Cl_1.5) 的性能.
研究电化学稳定性对细胞整体性能和循环能力的影响.
评估Li_5.5PS_4.5Br_1.5作为高级电池应用的优越SSE的潜力.

主要方法:

_5.5PS_4.5Br_1.5和_5.5PS_4.5Cl_1.5电解质的制造和表征.
使用两种类型的电解质组装LiIn SSE S-C-SSE电池电池.
电化学测试,包括循环性能,容量保留和稳定性窗口分析.

主要成果:

与Li_5.5PS_4.5Br_1.5相比,Li_5.5PS_4.5Cl_1.5的电化学稳定性窗口更广泛.
尽管离子导电率略低,但Br-doped电解质显著改善了细胞性能和循环能力.
使用Li_5.5PS_4.5Br_1.5的LiIn SSE S-C-SSE电池在100个循环 (1.4-3.1 V) 上实现了90%的容量保留,在250个循环 (1.1-3.1 V) 上达到68%.

结论:

用添加的基电解质为ASSLSBs提供了优越的电化学稳定性,而不是用添加的变体.
增强的稳定性转化为改善硫电池的长期循环和容量保留.
Li_5.5PS_4.5Br_1.5为开发高性能和耐用的全固态硫电池提供了一个有希望的SSE.

关键词:

所有固态电池都是固态电池.电化学稳定性窗口电化学稳定性窗口电解质分解电解质的分解 argyrodite电解质的电解质是什么硫电池是硫电池的一种.

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