一种基于CaI2的电解质,由可逆Ca-有机和Ca-Se电池的酸阳离子受体激活
Zhen Hou1,2, Rui Zhou1, Kai Liu2
1Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, 999077, China.
Angewandte Chemie (International ed. in English)
|September 20, 2024
概括
研究人员开发了一种用于金属阳极的新型电解质,形成稳定的固体电解质介相 (SEI),可实现高效的离子运输和可逆循环. 这一突破为先进的基于的电池铺平了道路.
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:
- 消极固体电解质界面 (SEI) 对于稳定的 (Ca) 金属阳极至关重要,但往往会阻碍Ca2+运输和可逆循环.
- 现有的/基电解质具有复杂的合成,其无机SEI组件的Ca2+导电性尚不清楚.
研究的目的:
- 调查可逆Ca金属阳极的Ca2涉及的SEI的潜力.
- 为了提高SEI中的Ca2+导电性,使用酸阳离子受体.
主要方法:
- 密度函数理论 (DFT) 计算用于预测无机相中的Ca2+扩散障碍.
- 电解质配方使用商业上可用的CaI2-dimethoxyethane.
- 引入酸离子受体以形成混合SEI.
- 对Ca金属沉积/剥离和全细胞性能进行电化学测试.
主要成果:
- DFT计算预测CaI2在测试的无机相中具有最低的Ca2+扩散屏障.
- 参与CaI2的SEI形成支持可逆的Ca/Ca2+氧化还原反应.
- 通过使用阳离子受体,实现了具有增强Ca2+导电性的混合CaI2/玻化物SEI.
- 与没有离子受体的电解质相比,观察到沉积/剥离过量的7倍减少.
结论:
- 商用CaI2-dimethoxyethane电解质可以形成SEI,从而实现可逆的Ca金属循环.
- 混合CaI2/化物SEI显著提高了Ca2+导电性和电化学性能.
- 这种方法有助于开发高性能,可逆的金属全细胞.
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