调整循环电解质的固体阻碍使高压金属电池成为可能
Jiahang Zou1, Hanxu Yang1, Shilin Wu1
1School of Materials Science and Engineering, Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials of Ministry of Education, Anhui University of Technology, Maanshan 243002, China.
Journal of colloid and interface science
|December 29, 2024
概括
在以太电解质中的甲基替代增强了金属阳极的稳定性,并扩大了电化学窗口. 4-甲基-1,3-二醇 (4-Me DOL) 显示出卓越的性能,使高压电池能够稳定循环运行.
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
- 有机化学 有机化学
背景情况:
- 基于以太的电解质为金属阳极 (LMA) 提供高稳定性,但在高压下表现不佳.
- 循环乙烯的结构优化可以提高电化学稳定性,但设计规则尚未确立.
研究的目的:
- 为了研究甲基替代位置对1,3-二氧化 (DOL) 性能的影响,以提高电解质性能.
- 在高压金属电池中建立以太基溶剂分子的设计原则.
主要方法:
- 研究了甲基组位置对1,3-二氧醇 (DOL) 分子性质的影响.
- 在4-甲基-1,3-二醇 (4-Me DOL) 和2-甲基-1,3-二醇 (2-Me DOL) 中使用1M LiFSI评估电解质性能.
- 测试了具有优化电解质的Li-LiNi0.5Co0.2Mn0.3O2 (NCM523) 细胞.
主要成果:
- 甲基替代有效地抑制了DOL的环开放聚合.
- 4-Me DOL,具有较大的固体阻碍,显示较弱的溶解,促进丰富的接口.
- 1M LiFSI/4-Me DOL电解质表现出优异的LMA稳定性和延长的电化学窗口高达4.6V.
- 在使用 LiFSI/4-Me DOL 电解质时,NCM523 细胞表现出超过 300 次的稳定循环.
结论:
- 甲基替代位置显著影响金属电池的以太电解质特性.
- 4-Me DOL为高压电解质提供了一个有前途的溶剂,增强了稳定性和电化学窗口.
- 这项研究为先进的电池电解质提供了一个新的分子设计策略.
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