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聚合物涂层具有平衡的协调强度和离子导电性,用于无树的阳极
Xiaomin Cai1, Wenzhi Tian1, Zekai Zhang2
1School of Chemistry and Chemical Engineering, Zhangjiang Institute for Advanced Study, Frontiers Science Center for Transformative Molecules, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|October 11, 2023
概括
一种新型的聚-2-乙烯胺 (P2VP) 涂层有效地抑制电池中树脂的生长. 这种功能化聚合物增强了离子导电性,并降低了稳定,高性能阳极的界面电阻.
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
- 聚合物化学 聚合物化学
背景情况:
- 树突的生长是可充电电池的一个主要挑战.
- 功能化的聚合物涂层可以减轻树突的形成,但往往会增加界面电阻.
- 优化聚合物涂层,以抑制树突和有效的离子运输至关重要.
研究的目的:
- 为了开发一个聚2-乙烯二) (P2VP) 涂层,用于无树的阳极.
- 调节P2VP涂层的协调强度和离子导电性.
- 为了提高阳极的电化学性能和稳定性.
主要方法:
- 在阳极上涂上聚2-乙烯胺 (P2VP).
- 使用部分四元化的P2VP (q-P2VP) 来降低界面电阻.
- 使用静电电位计算来分析Zn2+协调.
- 进行电化学测试,以评估离子导电性,超电位和循环稳定性.
- 用修改的阳极组装和测试一个完整的电池电池.
主要成果:
- P2VP涂层提高了电解质的湿透性和 Zn2+ 的迁移速度 (tZn2+ = 0.58).
- P2VP与Zn2+的轻度协调 (吸附能量=-0.94 eV) 促进了优先的Zn沉积.
- 部分四元化P2VP (q-P2VP) 将界面电阻降低到126 Ω,并增加了Zn2+传递数 (t2+=0.78).
- 装饰着q-P2VP的Zn阳极在10mA cm-2下表现出低超电位 (≈46mV) 超过1000小时.
- 一个完整的细胞在500个周期中表现出低容量衰变率,每周期为0.018%.
结论:
- P2VP涂层,特别是部分四层化版本,有效地抑制了树脂的生长.
- 轻度协调和部分电解的协同效应增强了Zn2+运输和阳极稳定性.
- 这一战略为开发高性能,持久的可充电电池提供了一个有前途的方法.
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