"低活性溶剂"工程的优质动力学,用于稳定的金属电池
Haifeng Tu1,2, Zhigang He2, Ao Sun2
1School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Nano letters
|May 2, 2024
概括
一个新的"低活性溶剂"电解质 (LASE) 系统稳定了金属电池中的电解质/电极介面 (EEI). 这种方法增强了离子扩散,并抑制了树突的生长,从而提高了电池的性能.
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
- 电池技术 电池技术
背景情况:
- 溶解+离子的结构对电解质/电极间相 (EEI) 组成和溶解能量障碍产生重大影响.
- 这些因素对于确定金属电池 (LMB) 中的+扩散动力学至关重要.
研究的目的:
- 引入"溶剂活性"概念,以量化电解质成分和溶解Li+结构之间的关系.
- 开发一种低活性溶剂电解质 (LASE) 系统,以实现稳定,富含无机的EEI.
主要方法:
- 提出了"溶剂活性"概念,以将电解质组成与溶解Li+结构联系起来.
- 利用纳米LiF粒子捕获自由溶剂分子,创建一个LASE系统.
- 调整了电极电位和溶剂度之间的相关性,以指导LASE的开发.
主要成果:
- 开发的LASE系统成功地形成了一个稳定的,富含无机的EEI.
- 在金属电池中表现出卓越的反二增长行为.
- 在Li/LiNi0.8Co0.1Mn0.1O2电池中在0.5°C下进行250个循环后,达到169mAhg-1的容量.
结论:
- "溶剂活动"概念提供了一种定量方法来控制溶解Li+结构和EEI形成.
- LASE系统有效地促进了稳定的EEI,抑制了树的生长,并提高了电池的性能.
- 这项工作为推进金属电池技术提供了一个有前途的战略.
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