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一种基于酸的多功能电解质添加剂使高能离子电池能够长周期运行

Sewon Park¹, Gayoung Choi², Hyeong Yong Lim²

¹Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.

ACS applied materials & interfaces

|July 7, 2023

概括

一种新的电解质添加剂,二三甲基) 化 (BTSPFA),通过防止电解质氧化和过渡金属漏,提高了后离子电池的稳定性. 这导致了富含Ni的正极材料中容量保留的改善.

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
化学工程是化学工程的重要组成部分.

背景情况:

富含的分层氧化物对于下一代离子电池 (LIB) 是至关重要的.
这些阴极中的高价值可以导致电解质氧化和过渡金属 (TM) 泄漏,导致性能降低.
来自LiPF6水解的HF等酸性副产品加剧了阴极不稳定性和接口问题.

研究的目的:

引入二甲基三甲基酸酸 (BTSPFA) 作为多功能电解质添加剂.
在LIBs中增强石墨阳极和丰富的阴极的界面稳定性.
为了减轻高能LIB中的电解质氧化和TM液.

主要方法:

研究了BTSPFA的高频清理能力,通过裂解西乙烯键.
分析了以P-O和P-F物种丰富的稳定阴极电解质接口 (CEI) 的形成.
研究了创建一种富含无机物的固体电解质间相 (SEI),以抑制电解质的减少.
评估了BTSPFA对TM漏抑制和阳极保护的协同效应.

主要成果:

BTSPFA有效地清除腐蚀性HF,防止电解质氧化和阴极降解.
形成了一个稳定的,极性CEI和一个富含无机的SEI,改善了接口完整性.
抑制过渡金属从富含Ni的阴极中出,并防止TM沉积在石墨阳极上.
使用1重%BTSPFA的LiNi0.8Co0.1Mn0.1O2/石墨全细胞在1C和45°C的500个循环后显示出79.8%的容量保留.

结论:

BTSPFA是一种高效的多功能添加剂,用于稳定LIB中的丰富的阴极和石墨阳极.
该添加剂解决了关键的接口恶化问题,为高性能能量存储铺平了道路.
开发的战略为提高先进的LIBs的周期寿命和可靠性提供了一个有希望的解决方案.

关键词:

在 HF 拾荒者.阴极电解质相间阶段电解质添加剂是一种电解质添加剂.石墨阳极是一种石墨阳极.离子电池是一种离子电池.富含的分层阴极是富含的.

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