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Updated: Jul 9, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

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了解电解质添加剂 LiBF 在高压 LiCoO 电池中的贡献

Jingwei Qiu¹, Juan Guo¹, Jianhui Li^1,2

¹Guangdong Provincial International Joint Research Center for Energy Storage Materials, School of Chemistry, South China Normal University, Guangzhou 510006, China.

ACS applied materials & interfaces

|November 28, 2023

概括

这项研究引入了四博酸 (LiBF4) 作为一种电解质添加剂,以稳定高压囊细胞. 它通过在电极上形成保护接口膜,显著提高容量保留和低温性能.

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
储能储能储能储能储能储能

背景情况:

带有LiCoO2阴极和SiO/C阳极的高压囊电池提供高能量密度,但受到不稳定的阴极电解质介面 (CEI) 和固体电解质介面 (SEI) 薄膜的影响,限制了实际应用.
这些不稳定的相间膜导致阻抗高和周期寿命低,阻碍了这些有前途的能量存储设备的广泛采用.

研究的目的:

开发一种新的方法,用于在高压袋式电池中创建稳定,低阻抗的阴极和阳极接口膜.
研究四博酸 (LiBF4) 作为电解质添加剂在同时形成这些保护性介相层中的作用.

主要方法:

使用四博酸 (LiBF4) 作为高压囊细胞 (LiCoO2阴极,SiO/C阳极) 中的电解质添加剂.
研究了电化学性能,包括容量保留和低温放电能力,有或没有LiBF4.
分析了接口膜形成机制,专注于LiBF4与电极材料的相互作用.

主要成果:

应用1.0%的LiBF4显著提高容量保留从26.1%到82.2%在150个循环后1C (3.04.4V).
在-20°C的低温放电容量从637 mAh提高到794 mAh (在1°C下),并增加了LiBF4.
添加LiBF4导致形成稳定的阴极接口膜,这是由于它在LiCoO2表面与氧的结合能很低.

结论:

四博酸 (LiBF4) 是一种有效的电解质添加剂,用于稳定高压囊细胞.
LiBF4促进保护性阴极和阳极接口膜的形成,增强循环寿命和低温性能.
该研究通过阐明LiBF4在形成保护性阴极接口中的机制来解决一个关键的知识差距.

关键词:

LiCoO2 配备的是SiO/C 囊细胞.阴极电解质相间阶段在循环和低温性能方面.四二酸是一种四二酸.固体电解质相间阶段

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