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为稳定的高温金属电池提供弱溶解的循环以太基深度环节性电解质

Yanru Yang¹, Qin Li¹, Huan Li¹

¹Department of Materials Science, Fudan University, Shanghai, 200433, China.

Angewandte Chemie (International ed. in English)

|December 2, 2024

概括

这项研究引入了一种新型的使用四基 (THP) 溶剂的深度环氧电解质 (DEE),以提高金属电池的性能. 新的DEE在高温下提高了稳定性和安全性,这对于下一代储能至关重要.

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 (LMB) 在高温下面临不稳定性和安全挑战.
现有的深度解电解质 (DEE) 患有电极不相容性和不足的还原稳定性.
在DEE中的高Li+度可能导致电化学性能差.

研究的目的:

设计一个新的DEE,以提高高温LMB的稳定性和兼容性.
解决当前DEE的局限性,特别是电极不兼容性和还原稳定性.
为了提高金属电池中LiMn2O4阴极的性能.

主要方法:

开发一种新型DEE,使用弱溶解四基 (THP) 溶剂.
加入 bis ((三甲硫) 胺 (LiTFSI) 缩剂,以增强降解电阻.
使用开发的DEE在室温和高温下对Li12和LiMn2O4电池进行电化学测试.

主要成果:

新的DEE表现出与Li金属阳极的良好兼容性和LiMn2O4阴极的高温耐受性.
在室温下600个循环中,LiMn2O4电池表现出高容量保留率 (96.02%).
在55°C的120个周期和低自放电后,实现了显著的高温性能,保持了91.72%的容量.

结论:

设计的DEE为开发稳定安全的高温金属电池提供了一个有前途的替代方案.
这种电解质设计克服了传统DEE的关键局限性,从而实现了强大的性能.
这种方法有可能扩展到其他需要高温操作的电池化学.

关键词:

深度欧特克斯电解质的电解质.电解质的电解质是一种电解质.界面化学界面化学金属电池是金属电池的一种.溶剂溶解剂溶解能力较弱的溶剂

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