氧电池中稳定阳极的增强阳离子协调的溶解结构
Yaohui Huang1, Jiarun Geng1, Zhuoliang Jiang1
1Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Frontiers Science Center for New Organic Matter, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071, China.
Angewandte Chemie (International ed. in English)
|June 7, 2023
概括
研究人员开发了一种新的电解质策略,以稳定氧 (Li-O2) 电池中的阳极. 这种方法提高了涂/剥离的效率,并将电池寿命延长了120多个周期.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 氧 (Li-O2) 电池具有较高的理论能量密度,但其性能受限.
- 在阳极上不可逆转的涂层和剥离是阻碍Li-O2电池稳定性的关键问题.
- 开发稳定的阳极对于推进下一代储能技术至关重要.
研究的目的:
- 研究一种溶解调节的策略,以提高Li-O2电池中的阳极的稳定性.
- 通过修改电解质组成和Li+溶解罩来减轻阳极降解.
- 通过合理的电解质设计,提高Li-O2电池的循环性能和效率.
主要方法:
- 将三乙酸离子 (TFA-) 纳入含有二 (硫) 胺 (LiTFSI) 的四乙烯糖醇二甲基乙烯 (G4) 基电解质中.
- 一种双盐电解质 (0.5 M LiTFA 和 0.5 M LiTFSI 在 G4 中) 的配方,以制造阴离子主导的酸盐.
- 分析电解质分解,固体电解质间相 (SEI) 形成和溶解能量障碍.
主要成果:
- 双盐电解质显著减弱了Li+-G4相互作用,抑制了G4分解.
- 形成了一层富含无机物质的SEI层,促进了易于界面Li+扩散.
- +的溶解能量屏障从58.20降至46.31kJ mol-1.
- 修改后的电解质使得有限的阳极的-O2电池能够延长120个循环的循环性能.
结论:
- 使用TFA-离子调节溶解是一种有效的策略,用于稳定Li-O2电池中的阳极.
- 开发的电解质增强了Li+动力学,并促进了保护性SEI层的形成.
- 这项研究为设计高性能Li-O2储能系统的先进电解质提供了宝贵的见解.
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