稳定的氧电池通过N,N-二甲基胺基电解质中的溶剂-稀释剂相互作用来实现
Dong-Yue Yang1,2, Jia-Yi Du1,2, Yue Yu3
1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.
Angewandte Chemie (International ed. in English)
|July 18, 2024
概括
研究人员使用N,N-二甲基胺 (DMA) 和甲基非甲基乙烯 (M3) 开发了一种用于氧电池的新型电解质. 这种新的电解质增强了阳极的稳定性,并提高了在各种温度下电池循环性能.
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:
- 开发用于超高能量密度氧 (Li-O2) 电池的电解质需要稳定性来抵抗强氧化.
- N,N-二甲基胺 (DMA) 对活性氧物种具有抗性,但具有较差的金属阳极兼容性.
研究的目的:
- 通过创造一种新的电解质来提高Li-O2电池的稳定性和性能.
- 为了解决DMA在Li-O2电池应用中的局限性.
主要方法:
- 将甲基无布乙烯 (M3) 纳入基于DMA的电解质中,以形成局部高度电解质.
- 研究M3稀释剂的结构和化学特性及其与DMA的相互作用.
- 在阳极上分析固体电解质介相 (SEI) 的形成.
主要成果:
- 由于M3中稳定的C-F和CH3键,DMA/M3电解质表现出对O2和1O2攻击的增强稳定性.
- DMA和M3之间的分子间相互作用促进了离子衍生的,富含无机SEI的形成,改善了Li阳极的稳定性.
- 带有DMA/M3电解质的-O2电池在30°C (359个周期) 和-10°C (120个周期) 的温度下表现出优越的循环性能.
结论:
- 合理设计的 DMA/M3 电解质有效地克服了 DMA 对 Li-O2 电池的局限性.
- 局部高度电解质策略显著提高阳极保护和电池的整体性能.
- 这种方法为下一代超高能量密度Li-O2电池开发提供了有希望的途径.
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