用于金属电池的超低界面电阻的石榴电解质
Yutao Li1, Xi Chen1, Andrei Dolocan1
1Materials Science and Engineering Program and Texas Materials Institute , The University of Texas at Austin , Austin , Texas 78712 , United States.
Journal of the American Chemical Society
|April 25, 2018
概括
石榴石固体电解质的碳处理可以去除表面杂质,显著降低表面电阻. 这一突破通过提高离子导电性和防止树成长, 使稳定,高性能固态电池成为可能.
科学领域:
- 材料科学
- 电化学
- 固态化学
背景情况:
- 石榴石结构的Li7La3Zr2O12是先进电池的关键固体电解质.
- 挑战包括表面阻力,树突增长和表面层 (Li2CO3玻璃) 的降解.
研究的目的:
- 开发一种从石榴电解质中去除有害表面层的方法.
- 改进石榴石电池的接口性能和电化学性能.
主要方法:
- 在700°C下对石榴石颗粒进行碳后处理.
- 表面组成和界面电阻的表征.
- 制造和测试各种电池配置 (对称,完全固态,混合动力).
主要成果:
- 有效地去除Li2CO3和减少Li-AlO玻璃相.
- 在Li/石榴石,石榴石/LiFePO4和石榴石/有机液体界面的界面阻力显著下降.
- 在对称,全固态和混合 Li-S 细胞中表现出稳定的循环与低超电位和高库伦比效率.
结论:
- 碳处理是一种简单有效的方法来提高石榴石固体电解质的性能.
- 克服接口挑战对于实现实用的固态电池至关重要.
- 改进的石榴电解质显示出下一代储能装置的巨大潜力.
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