一个绿色不对称的循环共溶剂分子用于高压水性离子电池
Yan Wang1,2, Ting Ou3, Yue Dong1,2
1Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, 325000, China.
Advanced materials (Deerfield Beach, Fla.)
|January 11, 2024
概括
一种新型的绿色混合水性电解质使用异二甲基乙烯 (IDE) 为水性电池提供了增强的安全性和4.3V的电压窗口. 这一突破可以实现稳定的循环,为更安全,高性能的储能解决方案铺平了道路.
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
- 绿色化学 绿色化学
背景情况:
- 水性电解质提供安全优势,但具有有限的电压窗口.
- 有机辅溶剂可以扩大电压窗口,但往往会带来安全和毒性风险.
- 开发安全,高性能水性电解质仍然是电池技术的关键挑战.
研究的目的:
- 开发一种非易燃,非有毒,低盐度的混合水性电解质.
- 调查异二甲基乙烯 (IDE) 作为绿色辅溶剂的使用.
- 为了提高电化学性能和水性电池的安全性.
主要方法:
- 一种混合水性电解质与1.85m盐度的异吸附二甲基乙烯 (IDE) 的配方.
- 研究IDE的分子结构及其与离子和水分子的相互作用.
- 分析固体电解质间相 (SEI) 层的形成和界面化学.
- 电化学测试一个Li$_{4}$Ti$_{5}$O$_{12}${(LTO) 给LiMn_{2}$O$_{4}${(LMO) 完整的细胞.
主要成果:
- 使用IDE.成功开发了一种具有低盐度 (1.85m) 的新型非易燃,非有毒的水性电解质.
- IDE独特的3D结构促进了离子参与溶解,并形成了一个强大的LiF丰富的SEI层.
- 电解质通过抑制界面侧面反应,实现了广泛的4.3V电压窗口.
- 全细胞LTO下载器LMO在2°C的450个周期中表现出卓越的循环稳定性.
结论:
- 基于IDE的绿色混合水性电解质为传统危险电解质提供了一个有希望的替代品.
- 独特的溶解结构和IDE的结调节是实现高电压和稳定的关键.
- 这项工作提出了开发安全和高性能水性电池的新战略.
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