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用LiBF4添加剂提高金属阳极的长期循环稳定性

Yinghao Zhang¹, Hanyu Tu¹, Li Yang^2,3

¹College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.

The journal of physical chemistry letters

|March 7, 2025

概括

在电解质中添加的四博酸 (LiBF4) 添加剂可以防止金属电池中的树的生长. 这提高了稳定的循环和库伦比克效率,用于先进的能量存储.

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:

金属电池具有较高的理论容量,但由于不均的涂层/脱落,因此遭受了形形成和低库伦比效率.
开发稳定的金属阳极对于下一代储能解决方案至关重要.

研究的目的:

研究四博酸 (LiBF4) 作为电解质添加剂的有效性,以提高金属阳极性能.
阐明LiBF4添加影响离子沉积和固体电解质介相 (SEI) 形成的机制.

主要方法:

进行了理论计算,以了解离子相互作用和沉积机制.
实验研究使用了纳米电池与含有LiBF4的以太电解质.
评估了电化学性能,包括循环稳定性和库伦比克效率.

主要成果:

添加LiBF4有助于Li+形成静电屏蔽效应,引导均的Na+沉积.
BF4的分解导致了NaF的形成,从而形成了一个理想的SEI层.
配有LiBF4添加剂的NAGEDAI和NAGEDAI对称电池在1.0 mA cm-2.2下实现了3000小时的稳定循环.

结论:

LiBF4是一种有效的电解质添加剂,用于稳定电池中的金属阳极.
+屏蔽和富含NaF的SEI形成的综合作用是提高电池性能的关键.
这项研究为开发高性能基储能系统提供了宝贵的见解.

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