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单体介相使高性能离子电池在零下温度下实现快速动力学

Yi-Hu Feng¹, Mengting Liu¹, Junxiu Wu²

¹Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P. R. China.

Angewandte Chemie (International ed. in English)

|April 2, 2024

概括

一种新型的低度电解质可以在低温下实现高性能离子电池 (SIB). 这种电解质形成了一个稳定的介相,增强在零下环境中的循环稳定性和速率能力.

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:

离子电池 (SIBs) 是有前途的,但由于其缓慢的动力学和不稳定的介面相,在低温性能方面面临挑战.
现有的电解质在零下条件下难以保持效率和稳定性,限制了SIB应用.

研究的目的:

为SIBs开发低度电解质,以提高在低温下电化学性能.
在零度以下温度下研究电极/电解质间相的形成和特性.

主要方法:

在二甲基乙烯基醇二甲基乙醇中配制0.5MNaPF6电解质.
在低温下对SIB (Na0.7Li0.03Mg0.03Ni0.27Mn0.6Ti0.07O2//Na和硬碳//Na) 进行电化学测试.
使用先进的特征化技术分析阴极/电解质间相.

主要成果:

拟议的电解质形成了一个薄,无形,同质的阴极/电解质介面,富含有机成分.
这种间相促进了Na+的迁移,并阻止了有害的副作用反应,改善了结构稳定性.
SIB显示出高容量保留 (90.8%在1C下900个循环后) 和在-30°C下超过310mAhg-1的容量.

结论:

开发的低度电解质显著提高了SIBs的低温性能.
工程间相是实现长期循环稳定性和在零度以下环境中的优异速率能力的关键.
这项工作为SIB在寒冷气候中的实际应用铺平了道路.

关键词:

阶段间的阶段间.运动学的动力学.低温低温的低温是一个问题.离子电池离子电池溶解结构是一个溶解结构.

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