一个预氧化策略,以建立稳定的氧化物阴极/化物固态电解质接口,用于高能量的所有固态电池.
Hanzhou Liu1, Yang Lu1, Yanchen Liu1
1School of Metallurgy and Environment, Central South University, Changsha, 410083, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|February 28, 2025
概括
一种新的预氧化策略通过形成强大的Y-O键,稳定化物固态电解质,防止具有高能阴极的全固态金属电池 (ASSLB) 的降解.
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:
- 全固态金属电池 (ASSLB) 提供高能量密度和安全性.
- 化物固态电解质具有高离子导电性和广泛的电化学窗口.
- 不稳定的阴极-电解质接口 (CEI) 由于氧-离子相互作用限制了性能.
研究的目的:
- 开发一种基于Y的化物固态电解质的预氧化策略.
- 用氧化物阴极增强ASSLB中CEI的稳定性.
- 提高ASSLBs的电化学性能和循环寿命.
主要方法:
- 合成了一个预氧化化物固态电解质,Li2YCl2.5Br1.5O0.5 (2LO-0.5).
- 研究了电解质结构中强大的Y-O键的形成.
- 使用2LO-0.5和一个LiNi0.83Co0.11Mn0.06O2 (NCM83) 阴极组装的ASSLB.
- 评估了电化学性能和循环稳定性.
主要成果:
- 氧化前的策略成功地在2LO-0.5.5中形成了强大的Y-O键.
- 这防止了不稳定的YOCl的形成,并促进了稳定的基于Y2O3的CEI.
- 具有2LO-0.5和NCM83的ASSLB实现了208 mAhg-1.1的初始放电能力.
- 电池在1000个循环后保持了80.6%的容量.
结论:
- 氧化前策略有效调节化物固态电解质和氧化物阴极之间的界面反应.
- 强大的Y-O债券是形成稳定的CEI和防止退化的关键.
- 这种方法使高性能ASSLB的合理设计成为可能.
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