通过替代优化离子协调,以增强基于石榴石的固体电解质的离子导电性
Shuhan Wang1, Ting Zeng1, Xiaojuan Wen1
1College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|March 7, 2024
概括
在石榴型固体电解质中用代替氧气,可以提高所有固态电池的离子导电性. 这种化物兴奋剂策略改善了离子运输和电池性能.
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:
- 石榴石类型的固体电解质具有优异的电化学稳定性,但具有较低的离子导电性,阻碍其在固态电池中使用.
- 提高离子导电性对于实现石榴石电解质在先进的储能应用中的潜力至关重要.
研究的目的:
- 通过阳离子替代来增强石榴石类型固体电解质的离子导电性.
- 研究 (Cl-) 替代氧化物 (O2-) 对离子 (Li+) 运输机制的影响.
- 为了评估在全固态离子电池中修改的石榴电解质的性能.
主要方法:
- 在石榴格子中的O2-部分替换为Cl- (Li6.35La3Zr1.4Ta0.6O11.85-Cl0.15,LLZTO-0.15Cl).
- 使用电化学阻抗光谱学对离子导电性的表征.
- 使用LiFePO4阴极和金属阳极的全固态电池的制造和测试.
主要成果:
- 化物替代有效地减少Li+迁移障碍,通过扩大扩散通道和优化Li+地点占用.
- 该LLZTO-0.15Cl电解质实现了4.21×10^-6 S cm^-1.1的高Li+导电性.
- 使用LLZTO-0.15Cl的固态电池在100个循环中显示出76.61%的容量保留率和99.48%的库伦比效率.
结论:
- 通过化物替代进行阳离子框架调制是一种可行的策略,可以增强石榴石类型的固体电解质导电性.
- 开发的LLZTO-0.15Cl电解质显示出对高性能全固态电池的承诺.
- 这种方法为设计用于储能的先进固体电解质提供了新的途径.
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