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通过操纵液态离子电池的溶解化学进行接口工程,运行≥100°C

Hongjing Gao¹, Yufang Chen¹, Tao Teng¹

¹College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, Hunan, 410073, China.

Angewandte Chemie (International ed. in English)

|June 27, 2024

概括

这项研究开发了一种用于高性能离子电池 (LIB) 的新型电解质,在极端温度下可靠运行. 新设计增强了安全性和电化学稳定性,使其能够在苛刻的环境中应用.

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:

高性能离子电池 (LIB) 对于军事和航空航天探索等苛刻应用至关重要.
在LIB中运行温度高 (>60°C) 会导致电解质-电极副作用导致电化学性能差以及安全问题.
现有的LIBs在热稳定性方面扎,限制了它们在极端环境中的使用.

研究的目的:

为高性能LIBs开发一种新的电解质系统,能够在高温下工作.
通过构建一个强大的异相介相,提高LIB在高温下的电化学性能和安全性.
克服当前LIBs在热阻力和运行稳定性方面的局限性.

主要方法:

设计了一个弱溶解电解质,利用协同溶解化学和功能添加剂.
在阴极和阳极上构建了一个独特的有机/无机异相介面.
研究了相间组成,重点是梯度F,富含B的无机和富含Si的有机成分.

主要成果:

在100°C以上的温度下实现了阴极和阳极的稳定运行,容量保持良好 (96.1%在80°C的500个循环后).
在LiCoO2基石墨全电池中表现出优越的耐温性,在120°C保持89.9%的容量.
观察到完全充电的袋式电池显著提高了安全性,这表明超高温应用的潜力.

结论:

开发出来的弱溶解电解质和由此产生的异质介相有效地抑制了电解质分解和过渡金属离子在高温下溶解.
新系统显著提高了高温电化学性能和安全性,而不会影响低温性能.
这些发现为LIBs在极端温度环境中的实际应用铺平了道路.

关键词:

功能添加剂是一种功能添加剂.离子电池是一种离子电池.强大的无机/有机异相间相.溶解规则的调节法则.耐热性耐热性耐热性耐热性

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