通过合理选择低温金属电池的稀释剂来服离子双极相互作用
Zhenglu Zhu1, Yan Li2, Jie Ji2
1State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029.
Angewandte Chemie (International ed. in English)
|January 31, 2025
概括
研究人员开发了一个新的参数来选择高级电解质的稀释剂,提高金属电池的性能,特别是在低温下. 这提高了离子溶解和电池循环稳定性.
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
背景情况:
- 具有高 (Li) 亲和度的先进电解质对于长周期金属电池 (LMB) 是至关重要的.
- 传统电解质中强烈的+溶剂相互作用阻碍了+溶解,特别是在低温下,导致不稳定的电极接口和LMB的循环稳定性差.
研究的目的:
- 为了研究稀释剂对电解质中的Li+溶解的影响.
- 开发一个参数来选择最佳的稀释剂来增强Li+溶解,并提高LMBs的低温性能.
主要方法:
- 在1,2-dimethoxyethane电解质中将各种稀释剂引入六酸.
- 分析稀释剂-溶剂和稀释剂-离子相互作用对Li+溶解的影响.
- 基于相互作用能量提出和使用一种稀释剂选择参数 (DSP).
主要成果:
- +溶解受稀释剂-溶剂和稀释剂-离子相互作用的影响.
- 更高的DSP值促进Li+溶解,并提高低温电池的性能.
- 选择的1,2-二chloroethane稀释剂 (DSP=3.95) 显示出Li Cu细胞中极好的Li可逆性 (98.5%在300个循环后).
- 液体LiFePO4细胞在 -20°C的温度下在300个循环中显示出最小的容量损失.
- 在100个循环后,LiNi0.8Co0.1Mn0.1O2电池保持了87%的容量.
结论:
- 这项研究为管理电解质中的强-溶剂相互作用提供了新的见解.
- 一个新的稀释剂选择参数 (DSP) 为设计先进的电解质提供了一种新的方法,以提高LMB性能.
- 这些发现为提高金属电池的循环稳定性和低温运行铺平了道路.
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