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通过新型电解质添加剂构建高强度接口膜,以提高石墨阳极的速率性能

Qiurong Chen¹, Min Chen^2,3, Zhangyating Xie¹

¹School of Chemistry, South China Normal University, Guangzhou 510006, Guangdong, China.

The journal of physical chemistry letters

|November 30, 2023

概括

一种新的电解质添加剂,FTMS,通过在石墨阳极上创建强大的固体电解质介面 (SEI),提高容量保留和速率能力,从而提高离子电池的性能.

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
电池技术电池技术

背景情况:

固体电解质间相 (SEI) 对于离子电池 (LIB) 的高功率输出至关重要.
在LIBs中的石墨阳极经常遭受缓慢的插入/逃离动力学,限制性能.

研究的目的:

为了提高LIBs中石墨阳极的利率性能.
使用新型电解质添加剂开发一个强大而稳定的SEI.

主要方法:

用1H,1H,2H,2H-perfluorooctyltrimethoxysilane (FTMS) 对电解质进行修改.
实验性表征和理论计算来分析SEI的形成和特性.

主要成果:

添加2%的FTMS提高了100个周期后在0.5°C的容量保留率,从77.6%提高到91.2%.
在2°C的容量显著增加,从86到229mAhg−1与FTMS.
FTMS形成了一个灵活和导电性的SEI层,由含的有机盐和含的聚合物组成.

结论:

FTMS是一种有效的添加剂,用于在石墨阳极上构建坚固稳定的SEI.
修改后的SEI增强了离子动力学,从而提高了LIB性能.
这种方法为克服LIBs中石墨阳极的运动限制提供了可行的解决方案.

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