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Zn^(2+)的成核能垒和成核过电位。Zn@LaF_(3)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3000 h)。Zn@LaF_(3)||VO_(2)全电池即使在大电流密度下循环3000次后仍保持75.8%的容量(116 mAh/g),远高于Zn||VO_(2)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。
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 Zn^(2+).Zn@LaF_(3)symmetric cells exhibit exceptional cycle life(over 3000 h)at a current density of 1.0 mA·cm^(-1).Even after undergoing 3000 cycles at high current density,Zn@LaF_(3)||VO_(2)full cells still retain 75.8%capacity(116 mAh/g),which is substantially higher than that observe in Zn||VO_(2)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.
作者
刘雨秋
杨娟
李欣
龙欢
吴贤文
吴湘思
LIU Yuqiu;YANG Juan;LI Xin;LONG Huan;WU Xianwen;WU Xiangsi(Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province,College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,China)
出处
《人工晶体学报》
CAS
北大核心
2024年第6期1078-1085,共8页
Journal of Synthetic Crystals
基金
国家自然科学基金(52364038,52064014,52064013)。
关键词
锌离子电池
锌金属负极
氟化镧
涂层
循环寿命
zinc-ion battery
zinc metal anode
lanthanum fluoride
coating
cycle life
