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金属有机框架玻璃稳定高压阴极,用于高效的金属电池

Lishun Bai¹, Yan Xu¹, Yue Liu¹

¹School of Materials Science and Engineering, Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha, 410083, Hunan, China.

Nature communications

|April 11, 2025

概括

一种新的金属有机框架 (MOF) 涂层增强了高压阴极,提高了电池的稳定性和电动汽车和电子产品的充电速度. 这种方法提高了能量密度和实际潜力.

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:

便携式电子产品和电动汽车需要具有高能量密度,稳定性和快速充电的电池.
像NCM-811这样的高压阴极提供更高的能量密度,但在传统电解质中存在不良稳定性和缓慢离子扩散.
现有的电解质在高电压下与溶解离子联合插入和溶剂分解作斗争,限制了电池的性能.

研究的目的:

开发一种方法来提高高压阴极材料的稳定性和性能.
在NCM-811阴极上创建保护层,以改善离子运输并抑制有害的副作用.
为了证明这种新阴极结构在高能量密度电池中的实际应用性.

主要方法:

一种金属有机框架 (MOF) 液体输液技术被用来涂覆NCM-811阴极颗粒.
这个过程将MOF液体整合到谷物边界中,形成一个薄而刚硬的MOF玻璃层.
MOF玻璃层具有2.9 Å的孔窗,用于离子运输和电解质管理.

主要成果:

MOF玻璃层有效地保护阴极免受粒子裂,电解质分解和金属离子迁移的影响.
内部MOF玻璃层促进了离子预溶解,并增强了快速的离子扩散.
使用Glass@NCM-811阴极的电池在高电压和充电速率下表现出更好的速率能力和循环稳定性,在袋式电池中达到385Wh kg-1.

结论:

MOF液体输注技术为稳定高压阴极提供了一个强大而通用的策略.
这种方法通过改善离子运输和抑制副作用反应,显著提高了电池性能.
该方法在其他高压阴极材料中显示出应用的前景,推动了储能技术的发展.

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