有机阴极电解质间相 达到4.8V LiCoO2
Chaocang Weng1, Meijia Qiu2, Bingfang Wang3
1School of Physics and Electronic Science, Shanghai Key Laboratory of Magnetic Resonance, Engineering Research Center for Nanophotonics & Advanced Instrument, Ministry of Education, East China Normal University, Shanghai, 200241, China.
Angewandte Chemie (International ed. in English)
|December 10, 2024
概括
开发稳定的高压离子电池至关重要. 这项研究引入了一种离子液体电解质,形成一种保护性有机阴极电解质间相 (CEI),显著提高了电池的性能和寿命.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 稳定高压离子电池,特别是使用氧化物 (LCO) 的电池,是一个重大挑战.
- 有效的阴极电解质间相 (CEI) 形成对于减轻高电压下有害反应至关重要.
- 现有的无机CEI,通常基于LiF,在高压LCO应用中表现不足.
研究的目的:
- 开发一种新的电解质系统,以提高高压离子电池的稳定性和循环性能.
- 通过使用具有高捐助数添加剂的离子液体电解质 (ILE) 来研究阴极电解质间相 (CEI) 的形成和特性.
- 证明拟议的CEI在抑制LCO和其他高压阴极材料中的降解机制方面的有效性.
主要方法:
- 使用一种含有高捐助数添加剂的离子液体电解质 (ILE).
- 研究的Li//LCO电池在高切断电压 (4.7V/4.8V) 循环运行.
- 分析了形成的CEI的组成和特性,重点关注C-F债券的特征.
主要成果:
- 在4.7V/4.8V的Li//LCO电池中实现了高容量保留 (86.9%/74.2%在0.5C的100个循环后)
- 发现了富含C-F债券的稳定有机CEI的形成,这归因于高捐助数添加剂.
- 在其他高压系统 (Li//LiNi0.6Co0.2Mn0.2O2在4.8V和Li//LiNi0.5Mn1.5O4在4.95V) 中,即使在60°C,也证明了卓越的循环稳定性.
结论:
- 开发的有机CEI富含C-F键,有效地使阴极表面无活性,抑制相位过渡,溶解和气体演变.
- 这种有机CEI战略为显著提高离子电池中高压阴极的电化学稳定性提供了一个有希望的途径.
- 这些发现为开发更高效,更耐用的高压离子电池技术铺平了道路.
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