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动态兴奋剂和相间稳定用于无和高压金属电池

Ziqing Yao¹, Tianji Fu¹, Tao Pan¹

¹College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China.

Nature communications

|March 22, 2025

概括

铁六酸增强了离子电池的稳定性,通过将电极与铁合并并形成保护界面. 这种添加剂改善了无 spinel LNMO 和其他高压阴极的循环和速率性能.

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:

无旋LiNi0.5Mn1.5O4 (LNMO) 提供高能量密度,但由于溶解,电解质分解和树生长,其循环稳定性不佳.
高压运行加剧了这些问题,限制了先进的离子电池化学的实际应用.

研究的目的:

为了提高LNMO阴极和其他高压正电极的循环稳定性和速率性能.
调查铁六酸作为电解质添加剂用于稳定电极接口的使用.
通过提高电极和电解质稳定性,实现高能量密度的离子电池.

主要方法:

使用铁六酸作为电解质添加剂在Li,S,LNMO和其他高压电池系统.
在循环过程中分析Fe3+在LNMO正电极中的动态兴奋剂.
使用电化学和材料分析技术,描述保护电极-电解质界面 (SEI和CEI) 的形成.

主要成果:

铁素六酸添加剂成功地将LNMO与Fe3+相合,提高了循环稳定性.
形成薄而密集的无机正电极电解质介面 (CEI) 和富含F,P的固体电解质介面 (SEI),有效稳定电极接口.
立体电池LNMO电池表现出更好的循环稳定性和速度性能,达到4.9V的充电截止值,袋式电池在160个循环中保持性能.
该添加剂证明对各种高压阴极 (LNMO,NCM,LCO) 有效,从而实现了470Wh/kg的金属袋式电池.

结论:

铁六酸是一种多用途的电解质添加剂,用于稳定高压离子电池电极.
动态兴奋剂和相间形成机制显著提高了电池周期寿命和性能.
这种方法为实现高能量密度和稳定的离子电池为实际应用铺平了道路.

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