卓越的低温全固态电池,通过高离子导电性和低能量屏障接口实现
Pushun Lu1,2, Sheng Gong3, Chuhong Wang3
1Beijing Advanced Innovation Center for Materials Genome Engineering, Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
ACS nano
|February 29, 2024
概括
开发稳定的接口是所有固态电池 (ASSB) 在低温下运行的关键. 本研究确定了冷条件的关键接口特征,改善了ASSB的容量保留.
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:
- 全固态电池 (ASSB) 在储能方面表现有前途,但在低温下面临挑战.
- 在零度以下的温度下,ASSB中接口的动力性质尚不清楚,这阻碍了低温设计.
- 不稳定的接口,如LiNi0.90Co0.05Mn0.05O2 (Ni90) 和Li6PS5Cl (LPSC) 固体电解质之间的接口,导致性能差.
研究的目的:
- 调查和解锁ASSB中的冷温度操作的关键接口功能.
- 了解接口修改对低温离子传输和激活能量的影响.
- 为指导坚固的正极/固体电解质接口的设计,以提高低温性能.
主要方法:
- 构建和分析ASSB的各种阴极接口.
- 使用Li2ZrO3 (LZO) 涂层来修改Ni90/LPSC接口并减少激活能量.
- 用Li3InCl6 (LIC) 化物固体电解质取代LPSC,以获得稳定的接口和低的激活能量.
- 进行 Li+ 导电接口属性的理论评估.
主要成果:
- 插入LZO涂层可以将Ni90/LPSC接口的激活能量从60.19kJ mol-1降低到41.39kJ mol-1.
- 用LIC化物固体电解质取代LPSC并使用LZO涂层,导致低激活能量为25.79kJ mol-1.
- 经过修改的Ni90/LIC/LPSC/Li-In ASSB在-30°C时表现出26.9%的更好的容量保留.
- 理论分析证实,高离子导电性和阴极/SE接口的低能量屏障对于高效的Li+运输至关重要.
结论:
- 接口稳定性和低激活能量对于ASSB的低温有效运行至关重要.
- Li2ZrO3涂层和Li3InCl6化物固体电解质是提高低温性能的有希望的策略.
- 了解界面动力学为设计下一代冷ASSB提供了必要的指导.
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