通过使用铁化电解质添加剂的Mn溶解抑制,使长循环水性离子电池成为可能
Zhaoheng Liang1, Fei Tian1, Gongzheng Yang2
1School of Materials Science and Engineering, Sun Yat-sen University, 510275, Guangzhou, P. R. China.
Nature communications
|June 16, 2023
概括
这项研究引入了一种阴离子捕获方法,以增强水性离子电池 (AIB). 通过使用一种新型电解质,AIB实现了更高的特异能,并显著改善了大规模能源存储的循环寿命.
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:
- 水性离子电池 (AIB) 提供安全和经济高效的大规模能源存储.
- 目前的AIBs具有较低的特定能量 (<80 Wh kg-1) 和有限的周期寿命.
- 铁普鲁士蓝色类似物,有前途的阴极材料,由于Jahn-Teller扭曲而降解.
研究的目的:
- 通过解决普鲁士蓝色类型的产能衰退来提高AIB的业绩.
- 为增强的AIBs开发一种新的水性电解质策略.
主要方法:
- 采用阴离子捕获方法,在缩的NaClO4电解质中使用铁化物作为支盐.
- 这种方法旨在填补NaFeMnF正极材料中的表面Mn空缺.
- 工程电解质和NaFeMnF电极被测试在一个硬币电池中的 perylenetetracarboxylic diimide 负电极.
主要成果:
- 开发的AIB系统在0.5 A g-1.1时实现了94 Wh kg-1的特定能量.
- 在2 A g−1.1. 的15,000个循环后,保持了73.4%的特殊排放能力保留.
- 阴离子捕获方法有效地缓解了容量衰减.
结论:
- 拟议的阴离子捕获方法显著提高了水性离子电池的特异能和循环寿命.
- 这一进步使得普鲁士蓝色基于模拟的AIB更适合于实际的大规模储能应用.
- 设计的电解质和电极组合代表了下一代电池技术的有前途方向.
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