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在基于的离子电池中,打破容量和稳定性之间的权衡
Weikang Jiang1,2, Kaiyue Zhu2,3, Weili Xie2,3
1Department of Chemical Physics, University of Science and Technology of China Hefei Anhui 230026 China yangws@dicp.ac.cn.
Chemical science
|February 16, 2024
概括
一种含有8%水的新型电解质在乙中显著提高了离子电池 (ZIB) 的容量和稳定性. 这种水在有机电解质克服了先进ZIB的高容量和长周期寿命之间的权衡.
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:
- 电解质中的水对离子电池 (ZIB) 构成了挑战,它们具有高容量,但会导致电极降解.
- 现有的水性电解质提供了高容量,而有机电解质提供了稳定性,创造了容量稳定性权衡.
研究的目的:
- 开发一种电解质,减轻水的有害影响,同时保持对ZIBs的好处.
- 调查控制水含量对ZIB性能和机制的影响.
主要方法:
- 作为 Zn ‖ 的溶剂,在乙酸中使用了一种含有 8% H 2 的电解质作为 Zn ‖ 的溶剂.
- 评估了电池容量,周期寿命和温度范围 (0至-50°C) 的性能.
- 分析了水含量对离子动力学和电极反应可逆性的影响.
主要成果:
- 在0.3Ag-1时达到490mAhg-1的高容量,在6Ag-1时9000个循环后保持80%的容量.
- 与纯水性或有机电解质相比,表现优越,特别是在低温下.
- 证实水含量极大地影响离子插入/提取和剥离/金动力学.
结论:
- 在有机电解质中精确控制的水含量 (8%的酸) 为高性能ZIB提供了一个有希望的策略.
- 这种方法平衡了高容量和卓越的稳定性,克服了以前的限制.
- 这些发现促进了对水在ZIB电解质中的作用的理解,为改进的电池设计铺平了道路.
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