降低竞争效应的固体电解质与均分散的无机物相间,使得金属电池具有超高速率和长寿命
Shuang Wan1, Keming Song2, Jiacheng Chen2
1State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology of Materials, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
Journal of the American Chemical Society
|September 19, 2023
概括
研究人员使用LiTFSI开发了一种用于金属电池的新固体电解质介面 (SEI). 这种策略增强了离子传输,并使稳定,高速的沉积成为可能,提高了电池的性能和寿命.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 强大的固体电解质介面 (SEI) 结构对于金属电池 (SMB) 的性能至关重要.
- 常见的无机SEI具有低导电性和差分布,阻碍了Na+扩散和均沉积.
研究的目的:
- 为改进的中小企业设计一种新的SEI,使用均分散的高导电性无机材料.
- 调查LiTFSI在SEI形成中的牺牲作用.
主要方法:
- 将LiTFSI引入基于盐的碳酸电解质,以创建自我牺牲的SEI.
- 利用LiTFSI和FEC之间的减少竞争来控制SEI的组成和形态.
- 使用和不使用修改后的SEI,对Na3V2 ((PO4) 3电池进行电化学测试.
主要成果:
- 由LiTFSI衍生出的SEI具有均分散的,高导电性的无机物质,如Li3N,提供快速的离子运输途径.
- 修改后的SEI有助于快速沉积,从而实现超高速率.
- 采用新的SEI的Na3V2 ((PO4) 3电池在10000次循环后在60°C下保持了89.15%的容量,性能优于对照电池.
结论:
- 使用LiTFSI的新型SEI设计为开发能够在极端高利率条件下运行的中小企业提供了一种新策略.
- 这种方法显著提高了金属电池的电化学稳定性和速度性能.
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