合理的盐分子调整,用于快速充电/放电金属电池
Pan Zhou1, Haiyu Zhou1, Yingchun Xia1
1The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China.
Angewandte Chemie (International ed. in English)
|March 13, 2024
概括
研究人员为金属电池 (LMB) 开发了一种新的盐 (LiETFSI),可以改善离子传输,形成稳定的固体电解质介相 (SEI),增强快速充电能力.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 电池技术 电池技术
背景情况:
- 金属电池 (LMB) 面临着低Li+转移数和不稳定的固体电解质介相 (SEI) 形成的挑战.
- 传统的盐阻碍了LMB的性能和安全性.
研究的目的:
- 合成和研究一种新型的自折叠盐LiETFSI及其类似物LiFEA,用于改进LMB电解质.
- 了解阴离子化学如何影响LMB中的Li+运输和SEI形成.
- 通过合理的电解质设计,增强LMB的快速充电/放电能力.
主要方法:
- 2-[2-[2-methoxy-ethoxy) 乙氧]乙硫烯 (trifluoromethanesulfonyl) 胺化物 (LiETFSI) 和1,1,1-三-N-[2-[2-[2-methoxy-ethoxy) 乙氧]甲硫胺化物 (LiFEA) 的合成.
- 使用电化学技术对LiETFSI和LiFEA电解质进行比较研究.
- 单晶X射线衍射分析离子结构和Li-N键距离.
主要成果:
- LiFEA和LiETFSI都表现出高的Li+转移数 (T+ ≈ 0.8) 由于乙烯氧化物部分捕获Li+.
- LiFEA 显示了 Li-N 键,表明了高的捐赠者数量和有效的 SEI 自清洁.
- 在LiETFSI调节Li-N距离中引入硫组,增强离子分离和SEI稳定性.
- 在使用开发的电解质的LMB中提高了快速充电/放电性能.
结论:
- 盐中离子化学的合理调整显著影响了LMB中的Li+运输和SEI形成.
- 新型LiETFSI盐为开发高性能LMB的先进电解质提供了一个有希望的途径.
- 这项工作为设计下一代储能系统提供了对离子-溶剂-离子相互作用的新见解.
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