(1. 中南大學 冶金與環(huán)境學院，長沙 410083；
2. 稀美資源(廣東)有限公司，清遠 513055)
摘 要: 以Zn(AC)2·2H2O和Bi(NO3)3·5H2O為原料，采用溶劑熱法制備出鋅二次電池負極用Bi2O3@ZnO復合材料，利用XRD、SEM、ICP、Tafel、EIS和恒電流充放電等研究Bi2O3@ZnO復合材料中Bi含量對材料組成、結構及電化學性能的影響。結果表明：當前驅體在600 ℃下熱處理5 h，Bi2O3@ZnO復合材料中Bi含量由2.7%提高至8.6%時，其腐蝕電位先從-1.466 V正移至-1.441 V，100次循環(huán)后，放電比容量從383.8 mA·h/g提高至621.3 mA·h/g；進一步提高Bi含量至11.4%(質量分數)時，腐蝕電位則負移至-1.447 V，100次循環(huán)后的放電比容量降低至493.3 mA·h/g。Bi含量為8.6%的Bi2O3@ZnO復合材料用于鋅二次電池負極表現出較好的電化學性能，1C倍率下循環(huán)100圈后容量保持率達97.4%，平均放電比容量為604.9 mA·h/g。
關鍵字: 鋅二次電池；鋅負極；Bi含量；電化學性能
（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
