内部海尔姆霍尔茨层通过共同溶剂策略控制高性能铜六酸盐//电池的内部海尔姆霍尔茨层控制
Ziwei Chai1, Ziwei Zhao1, Pengcheng Li1
1Department of Mechanical Engineering, University of Alberta, 9211-116 Street NW., Edmonton, Alberta T6G 1H9, Canada.
Journal of colloid and interface science
|January 3, 2025
概括
这项研究引入了一种新的电解质,用于铜六酸盐//全细胞,显著改善稳定性和循环寿命. 新系统可以防止材料溶解,即使在低温下也能保持长期性能.
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:
- 铜六化酸盐 (CuHCF) 为储能提供高电压和成本效益.
- 由于Cu和Fe的溶解,CuHCF//Zn全细胞在水性电解质中遭受容量衰减.
- 溶解导致不可逆转的Zn2+插入和形成ZnxCu1−xHCF.
研究的目的:
- 为了提高CuHCF//Zn全细胞的稳定性和周期寿命.
- 为了减轻活性物质溶解引起的容量衰变.
- 开发一种新的电解质系统,以提高电化学性能.
主要方法:
- 电解质工程使用甲基酸盐 (MA) 与三酸盐 (Zn(OTf) 2) 盐的共同溶剂.
- 研究MA在抑制水活动和重塑界面物种分布方面的作用.
- 使用MA来抑制Cu和Fe活性物质的溶解.
主要成果:
- 在0.1 A g-1.1下,在1700个周期 (2100小时) 中实现了100%的容量保留.
- 在-50°C下表现出稳定的性能,在1200个循环中保持一半的理论容量.
- 通过MA同溶剂策略显著减轻了元素溶解.
结论:
- MA辅溶剂电解质有效抑制CuHCF//Zn全细胞中的活性物质溶解.
- 这种电解质设计导致了特殊的长期循环稳定性和低温性能.
- 开发的系统代表了水性基电池的重大进步.
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