基于非腐蚀性甲基的盐用于稳定富含Ni的NMC阴极
Juntian Fan1, Vaidyanathan M Sethuraman1, Albina Borisevich2
1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA.
Small (Weinheim an der Bergstrasse, Germany)
|January 29, 2026
概括
一种新的盐,二三甲硫) 甲基 (LiCTf2),增强了离子电池中高阴极的稳定性. 这种非腐蚀性盐可以改善无添加剂的自行车性能.
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:
- 高LiNixMnyCo1-x-yO2 (NMC) 阴极为下一代离子电池 (LIB) 提供高能量密度.
- 与常规电解质的界面不稳定性,特别是六酸 (LiPF6) 和二 (trifluoromethanesulfonyl) 胺 (LiNTf2),限制了NMC阴极性能和电池寿命.
- LiNTf2导致电流收集器腐蚀超过3.7V,需要开发非腐蚀性电解质替代品.
研究的目的:
- 引入和评估一种新的,非腐蚀性甲基盐,二三甲硫) 甲 (LiCTf2),用于稳定NMC阴极.
- 研究LiCTf2抑制腐蚀并增强接口稳定性的机制.
- 为了证明使用LiCTf2基电解质的NMC阴极的改进电化学性能.
主要方法:
- 新型二三甲硫化物 (LiCTf2) 盐的合成和表征.
- 在含有LiCTf2,LiNTf2和LiPF6的电解质中对LiNi0.5Mn0.3Co0.2 (NMC532) 和LiNi0.8Mn0.1Co0.1O2 (NMC811) 阴极进行电化学测试.
- 电化学和显微镜表征以分析界面稳定性和腐蚀机制.
主要成果:
- 与LiNTf2不同的是,LiCTf2通过形成低可溶性Al3+复合物,有效地抑制电流收集器腐蚀.
- LiCTf2离子增强了Li+协调,加强了溶解结构并促进了更密集的介面相.
- 在LiCTf2基电解质中循环运行的NMC532和NMC811阴极与使用LiNTf2或LiPF6的电解质相比,在不需要膜形成添加剂的情况下显著改善了循环稳定性.
结论:
- 二三甲 (LiCTf2) 是一个有前途的非腐蚀性盐,用于先进的LIB电解质.
- LiCTf2提供了内在的接口工程功能,增强了高NMC阴极的电化学稳定性和循环性能.
- 这项工作为电解质优化提供了新的途径,这对于开发更安全,更耐用的下一代离子电池至关重要.
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