通过调整4.8V离子电池的溶解配置来实现无机主导的间相
Haoliang Wang1, Yan Zhao1,2, Lu Wang1
1School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China.
The journal of physical chemistry letters
|December 5, 2024
概括
为高压离子电池开发稳定的无机阴极电解质介面 (CEI) 是关键. 这项研究引入了一种新型电解质,该电解质形成了富含LiF的保护CEI,增强了富含的氧化阴极的循环稳定性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 实现稳定,无机主导的阴极电解质介相 (CEI) 层对于超高压阴极的长期循环至关重要.
- 使用有机溶剂的传统电解质分解,阻碍了强大的CEI层的形成,并限制了电池的性能.
- 富氧化物 (LLMO) 阴极在循环过程中面临着相变的挑战,这会影响其容量保留.
研究的目的:
- 克服传统电解质在高压应用中形成密集的无机CEI层方面的局限性.
- 为了研究一种新的电解质系统,促进形成一个离子丰富的Li+溶解结构.
- 为了提高丰富的基氧化物 (LLMO) 阴极的循环稳定性和性能.
主要方法:
- 利用了六化 (PF6-) 和1,1,1-三化-N,N-二甲基甲硫胺 (TFDMSA) 溶剂之间的局部离子不匹配.
- 使用特定的电解质组合:在TFDMSA中使用1米二 (硫) 胺 (LiFSI) +0.1米LiPF6.
- 制造并测试了LLMO干半电池,以评估CEI形成和电化学性能.
主要成果:
- 成功形成了离子丰富的Li+溶解结构,从而形成了丰富的聚合物 (AGG).
- 构建了一个以无机物为主,富含LiF的CEI层,有效地抑制LLMO相位过渡.
- 准备好的LLMO水晶半电池在4.8V的350个循环后显示出80.7%的出色容量保留.
结论:
- 拟议的电解质系统允许在局部环境中建造阴离子主导的Li+溶解结构.
- 这种方法促进了稳定,富含无机CEI的形成,这对于超高压阴极运行至关重要.
- 这些发现为开发下一代高能量密度电池的先进电解质系统提供了新的战略.
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