一种稳定的高性能离子电池,由高度兼容的极地同溶剂实现
Shuo Yang1,2, Guangpeng Wu1, Jing Zhang1
1School of Physics, State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 611731, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|July 17, 2024
概括
这项研究引入了2,2,2-三乙醇 (TFEA) 作为辅溶剂,以增强水性离子电池. TFEA稳定了阳极,阴极和电解质,使稳定,高性能电池,即使在低温下.
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:
- 水性离子电池面临的挑战是树状物生长,阴极溶解和低温电解质结.
- 这些问题限制了当前离子电池技术的实际应用和性能.
研究的目的:
- 为离子电池开发一种稳定,高性能的水性电解质.
- 研究2,2,2-三乙醇 (TFEA) 作为辅溶剂在提高电池稳定性和性能方面的作用.
主要方法:
- 将50%的TFEA引入1.3M Zn(CF3SO3) 2的水性电解质中.
- 使用理论计算和特征分析来理解TFEA的机制.
- 在包括低温在内的各种条件下测试Zn//Zn对称电池和充满电池.
主要成果:
- 添加TFEA有效地通过静电吸附和破坏水结合网络,抑制了阳极上的树脂的生长.
- TFEA提高了阴极的湿透性,减少了V2O5溶解,提高了电池的整体容量.
- Zn//Zn对称细胞在5 mA cm-2.2时达到782小时的循环寿命. 充满电池的容量在2000个循环后保持了87.73%的容量,温度为-25°C.
结论:
- TFEA是一种高度兼容的辅溶剂,可显著提高阳极,V2O5阴极和水性电解质的稳定性.
- 这一战略使得开发高性能和稳定的水性离子电池成为可能,特别是用于低温应用.
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