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盐阳离子两性激活电解质溶剂选择策略向耐用Zn金属阳极进行选择
Liyang Liu1,2,3, Haiying Lu2, Chao Han4
1State Key Laboratory for Powder Metallurgy, Central South University, Changsha, 410083, China.
ACS nano
|November 10, 2023
概括
使用logP值来选择离子电池的辅溶剂有效地抑制了树突的生长. 这种方法优化了电解质溶解结构,提高了电池的性能和稳定性.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 水性离子电池 (ZIBs) 面临诸如副作用和树生长等挑战,限制了其性能和安全性.
- 将辅溶剂添加到三酸盐 (Zn(CF3SO3) 2) 电解质中,可以形成ZnF2和ZnS的保护性固体电解质接口 (SEI).
- 为了合理的电解质设计,需要基于溶剂-溶解物相互作用选择辅溶剂的系统方法.
研究的目的:
- 建议并验证使用logP值 (八醇-水分区系数) 作为在Zn(CF3SO3) 2电解质中选择辅溶剂的标准.
- 为了证明辅溶剂logP如何影响电解质溶解结构和SEI形成.
- 通过优化电解质组成,提高ZIB的电化学性能.
主要方法:
- 评估了七种不同的辅溶剂,基于它们在Zn(CF3SO3) 2电解质中的logP值.
- 利用实验和理论方法分析电解质中的溶解结构和相互作用.
- 测试了//和//NaV3O8·1.5H2O细胞的电化学性能,使用和不使用选择的辅溶剂 (甲基酸盐).
主要成果:
- 具有类似于三叶酸离子 (CF3SO3-) 的logP值的辅溶剂具有有利的相互作用,重建电解质的溶解结构.
- 甲基酸盐 (MA),具有合适的logP,进入溶解,与CF3SO3-, Zn2+和H2O协调,减少水的活动.
- 优化的溶解结构促进了富含ZnCO3-ZnF2的SEI的形成,从而提高了ZIB的循环稳定性和性能.
结论:
- LogP 作为一个方便和有效的参数来选择辅溶剂,以量身定制 ZIB 中的电解质特性.
- 拟议的辅溶剂选择策略允许合理设计具有改进的溶解结构和SEI层的电解质.
- 这种方法通过对电解质化学的基本理解,为高性能和稳定的水性ZIB提供了一条途径.
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