(1. 中南大学 冶金与环境学院，长沙 410083；
2. 稀美资源(广东)有限公司，清远 513055)
摘 要: 以Zn(AC)2·2H2O和Bi(NO3)3·5H2O为原料，采用溶剂热法制备出锌二次电池负极用Bi2O3@ZnO复合材料，利用XRD、SEM、ICP、Tafel、EIS和恒电流充放电等研究Bi2O3@ZnO复合材料中Bi含量对材料组成、结构及电化学性能的影响。结果表明：当前驱体在600 ℃下热处理5 h，Bi2O3@ZnO复合材料中Bi含量由2.7%提高至8.6%时，其腐蚀电位先从-1.466 V正移至-1.441 V，100次循环后，放电比容量从383.8 mA·h/g提高至621.3 mA·h/g；进一步提高Bi含量至11.4%(质量分数)时，腐蚀电位则负移至-1.447 V，100次循环后的放电比容量降低至493.3 mA·h/g。Bi含量为8.6%的Bi2O3@ZnO复合材料用于锌二次电池负极表现出较好的电化学性能，1C倍率下循环100圈后容量保持率达97.4%，平均放电比容量为604.9 mA·h/g。
关键字: 锌二次电池；锌负极；Bi含量；电化学性能
（1. School of Metallurgy and the Environment, Central South University, Changsha 410083, China;
2. Ximei Resources (Guangdong) Limited, Qingyuan 513055, China）
Abstract:The Bi2O3@ZnO composite for anode of zinc secondary battery was prepared by solvothermal method, using Zn(Ac)2·2H2O and Bi(NO3)3·5H2O as raw materials. The effects of bismuth content on the composition, structure and electrochemical properties of Bi2O3@ZnO composites were investigated by XRD, SEM, ICP, Tafel, EIS and galvanostatic charge/discharge methods. The results show that, when the Bi contents in Bi2O3@ZnO composites increase from 2.7% to 8.6% after calcined at 600 ℃ for 5 h, the corrosion potential of Bi2O3@ZnO composites first moves from -1.466 V to -1.441 V, and the discharge capacity increases from 383.8 mA·h/g to 621.3 mA·h/g after 100 cycles. When the Bi contents further increase to 11.4%, the corrosion potential decreases to -1.447 V, and the discharge capacity decreases to 493.3 mA·h/g after 100 cycles. The Bi2O3@ZnO composite with Bi content of 8.6% used in the anode of zinc-nickel secondary battery shows good electrochemical performance. The capacity retention rate reaches 97.4% after 100 cycles at 1C rate, and the average discharge specific capacity is 604.9 mA·h/g.
Key words: zinc secondary battery; zinc anode; Bi content; electrochemical performance
