促进安全的金属电池的高界面能量介面
Sufu Liu1,2, Xiao Ji1, Jie Yue1
1Department of Chemical and Biomolecular Engineering , University of Maryland , College Park , Maryland 20740 , United States.
Journal of the American Chemical Society
|January 14, 2020
概括
一种新的合金阳极形成了稳定的富含的固体电解质互相 (SEI),有效抑制电池中的树突. 这种方法为提高电池安全性和性能提供了新的策略.
科学领域:
- 材料科学
- 电化学
- 电池技术
背景情况:
- 稳定的固体电解质间相 (SEI) 形成对于抑制电池中的树突至关重要.
- 由于复杂的电化学反应,通过电解质配方实现所需的SEI具有挑战性.
研究的目的:
- 通过修改金属阳极组合来开发稳定的SEI的新策略.
- 研究使用- (Li-Sr) 合金阳极形成富含化物 (SrF2) 的SEI.
主要方法:
- 设计的Li-11重%合金阳极在化电解质中内在形成富含F2的SEI.
- 使用密度函数理论 (DFT) 计算和实验性表征来分析SEI属性.
- 制造和测试的Li-Sr/Cu和Li-Sr/Li-Sr对称电池以及Li-Sr/阴极电池 (LFP和NCM811).
主要成果:
- 富含SrF2的SEI具有高界面能量与金属和优异的机械强度,有效抑制树的生长.
- 在Li-Sr/Cu细胞中显示出高库伦比效率 (例如,在1 mA cm-2下99.42%) 和稳定的循环 (180个循环在30 mA cm-2).
- 与LFP和NCM811阴极配对的Li-Sr阳极在各种电解质中显示出出色的容量保留.
结论:
- 通过调节金属阳极的组成来设计SEI属性是一种可行的和合理的方法.
- 合金阳极策略为开发更安全,更高性能的金属电池提供了有前途的途径.
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