在氧电池中可逆阳极的低温离子溶解过渡
Yaohui Huang1, Hengyi Fang1, Jiarun Geng1
1Frontiers Science Center for New Organic Matter, Key State Laboratory of Advanced Chemical Power Sources, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China.
Journal of the American Chemical Society
|September 12, 2024
概括
研究人员使用环甲基以太 (CME) 和二甲基乙 (DME) 开发了一种用于氧 (Li-O2) 电池的新型电解质. 这项创新通过改善离子传输和抑制树形成,提高了低温性能和循环稳定性.
科学领域:
- 电化学
- 材料科学
- 能量储存
背景情况:
- 氧 (Li-O2) 电池具有高能量密度,但由于溶剂协调和界面反应,其低温性能较差.
- 在低温下与+离子强烈的溶剂协调阻碍了2电池的运行,并对阳极造成了不可逆转的损伤.
研究的目的:
- 设计一种用于氧电池的新型电解质,
- 研究将环甲基乙醇 (CME) 纳入基于二甲氧乙 (DME) 的电解质对低温的氧电池功能的影响.
主要方法:
- 将环乙烯 (CME) 纳入用于Li-O2电池的二氧化乙 (DME) 电解质.
- 使用分子动力学模拟研究+离子的溶解结构和动力学.
- 分析阳极上形成的固体电解质间相 (SEI) 的组成和特性.
- 在低温下评估改造的2电池的电化学性能.
主要成果:
- 在室温和低温下,CME的结合引发了离子溶解过渡,促进了离子对离子的协调.
- 与DME相比,CME的低停留时间有助于在低温下更快地解.
- 形成了富含无机物的固体电解质间相 (SEI),增强了Li+运输,抑制了树的生长.
- 经过修改的2电池在-40°C下稳定循环运行,固定容量为1000mA/hg-1.
结论:
- 新的CME-DME电解质可以在低温下有效地运行氧电池.
- 这种电解质设计策略对开发先进的低温储能解决方案具有前景.
- 该研究强调了电解质工程对于克服2电池性能限制的重要性.
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