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一个用于全固态电池的双离子导体原型

Tao Yu^1,2, Haoyu Li^1,2, Yuankai Liu^1,2

¹College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, 210023, China.

Science advances

|November 3, 2023

概括

研究人员开发了一种全固态电池 (ASSB) 的新型双离子导体,可实现四电子的氧化还原反应. 这一突破提高了ASSB的安全性,能量密度和在广泛的温度范围内的性能.

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:

全固态电池 (ASSB) 提供更高的安全性和能量密度,但在动力学和界面兼容性方面面临挑战.
不足够的离子传输和接口问题阻碍了ASSB的实际应用.

研究的目的:

解决ASSB中的动态和界面挑战.
开发一种新的双离子导体,以提高ASSB性能.
探索一项用于最先进的ASSB开发的新战略.

主要方法:

开发一种双离子导体,同步+和+离子.
使用双离子导体构建一个全固态电池原型.
电化学特性包括容量,循环稳定性,速率性能和温度耐受性.

主要成果:

双离子导体促进了具有快速动力学的可逆四电子还氧反应.
在1500个循环中,ASSB实现了603.0mA·小时g-1的高可逆容量和93.2%的保留率.
观察到异常性能,包括在-60°C下运行,以及在20 mA cm-2.2下231.6 mA·hour g-1的速率能力.

结论:

引入Cu+到Li6PS5Cl中,创造了一个高效的离子迁移路径,提高了电化学性能.
双离子导电策略为开发先进的ASSB提供了一个有希望的方法.
这项工作为设计高性能和安全的ASSB提供了新的视角.

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