不同水热工艺对钨酸钴涂层锌负极保护的影响  

Effect of Hydrothermal Process on the Zinc Anodes Protection of Cobalt Tungstate Coating

作　　者：柳勇[1,2,3] 高雨萌[1] 邢艺博 贺明亮 张万红 熊毅[1,2,3] LIU Yong;GAO Yumeng;XING Yibo;HE Mingliang;ZHANG Wanhong;XIONG Yi(College of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Henan Provincial Collaborative Innovation Center of Nonferrous Metals Common Technology,Henan University of Science and Technology,Luoyang 471023,China;Key Laboratory of Nonferrous Metals Materials and Processing Technology,Henan University of Science and Technology,Luoyang 471023,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南科技大学有色金属共性技术河南省协同创新中心,河南洛阳471023 [3]河南科技大学河南省有色金属材料与加工技术重点实验室,河南洛阳471023

出　　处：《河南科技大学学报(自然科学版)》2025年第1期16-24,M0003,共10页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(52111530068);河南省自然科学基金项目(242300420021);河南省大学生研究训练计划项目(202310464012)。

摘　　要：水系锌离子电池在循环过程中,锌负极表面会发生枝晶生长以及析氢、钝化等副反应,极大地降低了电池的循环可逆性和使用寿命。为解决上述问题,采用水热法制备钨酸钴,并将其涂覆在锌负极上作为保护层,从而抑制锌负极上存在的问题,提高水系锌离子电池的电化学性能。研究了采用不同的水热工艺制备的钨酸钴对锌负极性能的改善效果,对循环前、后的样品进行X射线衍射(XRD)、扫描电子显微镜(SEM)以及电化学性能的分析。结果表明:当水热温度为180℃,水热时间为8 h,制备出的钨酸钴作为锌负极涂层材料效果最好,可以有效抑制锌负极的副反应。在0.5 mA·cm^(-2)的电流密度下,采用CoWO4@Zn负极组装的半电池可以稳定循环200圈,且平均库仑效率保持在98.78%。组装的CoWO4@Zn||NH4V4O10全电池在5 A·g^(-1)的条件下循环100圈后,比容量仍保持在160 mAh·g^(-1)左右。During the cycle of an aqueous zinc ion battery,dendrite growth,hydrogen evolution reaction,and passivation occur on the surface of the zinc anode.These side reactions significantly reduce cycle reversibility and service life of the battery.In order to solve the above problems,cobalt tungstate was prepared by hydrothermal method and coated on the zinc anode as a protective layer,so as to suppress the problems existing on the zinc anode and improve the electrochemical performance of the aqueous zinc ion battery.Most importantly,the improvement effect of cobalt tungstate prepared by different hydrothermal processes on the properties of zinc anode was investigated.Samples before and after the cycle were analyzed through X-ray diffraction,scanning electron microscopy and electrochemical analysis.the cobalt tungstate prepared at a hydrothermal temperature of 180℃and a hydrothermal time of 8 h has the best effect as the zinc anode coating material,and the side reactions on the zinc anode were effectively inhibited.At the current density of 0.5 mA·cm^(-2),the half battery assembled with CoWO 4@Zn anode can cycle 200 cycles stably,and the average coulomb efficiency is maintained at 98.78%.The specific capacity of the CoWO 4@Zn||NH 4V 4O 10 full battery is maintained at 160 mAh·g^(-1) after 100 cycles at 5 A·g^(-1).

关 键 词：锌离子电池 钨酸钴涂层 负极保护 锌枝晶 副反应 

分 类 号：O646.21[理学—物理化学]