水系锌离子电池LaF3涂层对锌负极的改性研究
Study on the Modification of Zinc Anode with LaF3 Coating in Aqueous Zinc-Ion Batteries
刘雨秋 1杨娟 1李欣 1龙欢 1吴贤文 1吴湘思1
作者信息
- 1. 吉首大学化学化工学院,湖南省高校科技创新团队,吉首 416000
- 折叠
摘要
氟化镧层是一种绝缘体,其耐腐蚀性和低极化有利于促进锌离子的扩散和抑制析氢,降低电极界面阻抗.本文采用旋涂法将沉淀法制备的氟化镧涂覆到商业锌片上,研究其对锌枝晶及全电池电化学性能的影响.结果表明:氟化镧涂层大幅降低了 Zn2+的成核能垒和成核过电位.Zn@LaF3对称电池在1.0 mA·cm-1的电流密度下具有超长的循环寿命(超过3 000 h).Zn@LaF3||VO2全电池即使在大电流密度下循环3 000次后仍保持75.8％的容量(116 mAh/g),远高于Zn||VO2全电池(33 mAh/g).氟化镧作为锌负极涂层,为无枝晶锌负极和高性能水系锌离子电池的构建提供了一种实用的方法.
Abstract
The lanthanum fluoride layer functions as an insulator,and its corrosion resistance and low polarization contribute to the facilitation of zinc ion diffusion while suppressing hydrogen evolution,thereby effectively reducing electrode interface impedance.In this paper,a precipitation method was employed to prepare a spin-coated lanthanum fluoride coating on commercial zinc foil in order to investigate its impact on dendritic growth of zinc and electrochemical performance of the full cell.The results demonstrate that the lanthanum fluoride coating significantly reduces both nucleation energy barrier and overpotential for Zn2+.Zn@LaF3 symmetric cells exhibit exceptional cycle life(over 3 000 h)at a current density of 1.0 mA·cm-1.Even after undergoing 3 000 cycles at high current density,Zn@LaF3||VO2 full cells still retain 75.8％capacity(116 mAh/g),which is substantially higher than that observe in Zn||VO2 full cells(33 mAh/g).Utilizing lanthanum fluoride as a negative electrode coating for zinc provides a practical approach towards constructing dendrite-free zinc negative electrodes and achieving high-performance aqueous zinc-ion batteries.
关键词
锌离子电池/锌金属负极/氟化镧/涂层/循环寿命Key words
zinc-ion battery/zinc metal anode/lanthanum fluoride/coating/cycle life引用本文复制引用
基金项目
国家自然科学基金(52364038)
国家自然科学基金(52064014)
国家自然科学基金(52064013)
出版年
2024
国家科技期刊平台
NSTL
万方数据