高度二元盐以太电解质用于具有Ni丰富阴极的高压金属电池
Zelin Li1, Xinping Chen2, Wenting Li3
1School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
ACS applied materials & interfaces
|July 2, 2024
概括
一种新的高度二元盐以太基电解质 (HCBE) 能够在高压金属电池中实现稳定的循环. 这种电解质扩大了电化学窗口,并形成了保护性阴极电解质接口 (CEI),以提高性能.
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:
- 由于阴极不相容,以太电解质在高压金属电池中受到限制.
- 开发稳定的电解质对于推进高能量密度金属电池至关重要.
研究的目的:
- 开发一种新型的高度二元盐以太电解质 (HCBE) 用于高压金属电池.
- 调查HCBE的溶解结构和接口属性.
- 为了证明HCBE在Liidiye的NCM83和Liidiye的Cu细胞中的性能.
主要方法:
- 一种高度缩的二元盐以太基电解质 (1.25 M LiTFSI + 2.5 M LiFSI 在 DME 中) 的合成和表征.
- 实验性电化学测试Li的电池组NCM83和Li的电池组Cu.
- 密度函数理论 (DFT) 计算来分析溶解结构和接口形成.
主要成果:
- HCBE表现出富含聚合物 (AGG) 的溶解结构,扩大了电化学窗口.
- 在高电压下的阴离子分解形成了富含无机电极电解质接口 (CEI) 膜,保护电解质.
- 基基NCM83细胞在150个循环后显示95%的容量保留和高库伦比效率 (>99.9%).
- 液体中体Cu细胞在使用HCBE时表现出98.5%的Coulombic效率.
结论:
- 在HCBE中,离子驱动的CEI形成有效地保护了阴极,并减少了副作用.
- HCBE为高压金属电池稳定循环提供了一个有前途的解决方案.
- 这项工作为设计用于先进的储能应用的高性能以太基电解质提供了洞察力.
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