水系锌离子电池LaF3涂层对锌负极的改性研究

摘要/Abstract

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。

关键词: 锌离子电池, 锌金属负极, 氟化镧, 涂层, 循环寿命

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.

Key words: zinc-ion battery, zinc metal anode, lanthanum fluoride, coating, cycle life

中图分类号:

O646.21

刘雨秋, 杨娟, 李欣, 龙欢, 吴贤文, 吴湘思. 水系锌离子电池LaF₃涂层对锌负极的改性研究[J]. 人工晶体学报, 2024, 53(6): 1078-1085.

LIU Yuqiu, YANG Juan, LI Xin, LONG Huan, WU Xianwen, WU Xiangsi. Study on the Modification of Zinc Anode with LaF₃ Coating in Aqueous Zinc-Ion Batteries[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(6): 1078-1085.

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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

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