表面格子调制使高负载全固态电池在高电压下能够稳定循环运行
Hong-Shen Zhang1,2, Xin-Cheng Lei3, Dong Su3
1CAS Key Laboratory of Molecular Nanostructure and Nanotechnol-ogy, and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), No.2 Zhongguancun North First Street, 100190, Beijing, P. R. China.
Angewandte Chemie (International ed. in English)
|February 21, 2024
概括
本研究引入了全固态离子电池 (ASSB) 中化物固体电解质的表面修饰. 新方法提高了高电压下阴极稳定性和循环寿命.
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
- 固态化学 固态化学
背景情况:
- 化物固体电解质为所有固态离子电池 (ASSB) 提供高离子导电性和氧化稳定性.
- 挑战包括不稳定的阴极/固体电解质 (SE) 接口和增加的接口电阻,特别是在高工作电压下.
- 在阴极接口上SE的降解限制了ASSB的性能和寿命.
研究的目的:
- 开发一种表面修改策略,以稳定基于化物的ASSB中的阴极/SE接口.
- 提高ASSB在高电压 (高达4.5V) 上工作的电化学性能和循环稳定性.
- 为了减轻在阴极接口的化物固体电解质的氧化分解.
主要方法:
- 使用AlPO4纳米在LiCoO2阴极表面上制造一个Al3+化,阴离子失序的表性纳米层.
- 在阴极/SE接口上使用缺乏的,类似岩盐的相.
- 用Li3InCl6电解质和修改的LiCoO2阴极对全固态离子电池 (ASSB) 的电化学测试.
主要成果:
- 设计的纳米层有效地抑制了Li3InCl6电解质的氧化分解.
- 达到了阴极/SE接口的稳定,即使在4.5V的高工作电压下也是如此.
- 修改过的阴极的ASSB显示出高放电能力和延长的循环寿命.
结论:
- 专门的阴极表面修改对于防止基于化物的ASSB中SE降解至关重要.
- 开发的纳米层策略使ASSBs在高电压下能够稳定地循环使用化物电解质.
- 这种方法有望提高下一代固态电池的性能.
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