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通过多功能添加剂调节高电池的电极-电解质接口

Jian Gao¹, Yuling Zou², Jingfang Han¹

¹State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Tan Kah Kee Innovation Laboratory, Xiamen University, Xiamen 361005, China.

ACS applied materials & interfaces

|February 21, 2024

概括

一种新的电解质添加剂N-甲基-N-三甲基三乙胺 (NMTFA) 稳定了高电池. 这增强了电极-电解质接口,提高了容量保留和热稳定性,用于下一代储能.

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

背景情况:

使用高三元阴极 (LiNiCoMn_1-O₂,x ≥ 0.8) 的高能量密度金属电池对于下一代能源存储至关重要.
这些电池的实际应用受到电极-电解质接口稳定性不佳的阻碍.

研究的目的:

引入N-甲基-N-三甲基三乙胺 (NMTFA) 作为一种新的功能性电解质添加剂.
通过形成强大的电极-电解质介面,提高LiLiNi_0.9Co_0.05Mn_0.05O₂电池化学的稳定性.

主要方法:

研究了NMTFA作为电解质添加剂在LiLiNi_0.9Co_0.05Mn_0.05O₂细胞中的作用.
用NMTFA分析了阳极-电解质间相 (AEI/SEI) 和阴极-电解质间相 (CEI) 的形成.
评估电池性能,包括容量保留和热稳定性.

主要成果:

在200次1C循环后,NMTFA添加显著提高了容量保持率,达到82.1%,而没有添加剂的容量保持率为52.5%.
来自NMTFA的SEI/CEI层有效地稳定了电极-电解质接口.
NMTFA增强了电解质的热稳定性,并抑制了LiPF的水解.

结论:

NMTFA是一种有前途的电解质添加剂,用于稳定高电池.
使用NMTFA调节电极-电解质接口是提高电池性能和寿命的关键.
这项研究为优化先进电池的电解质配方提供了见解.

关键词:

金属电池电池的使用情况富含的阴极是什么电解质添加剂是一种电解质添加剂.高能量密度,高能量密度.固体电解质相间阶段

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