摘要
以Zn(AC)_(2)·2H_(2)O和Bi(NO_(3))_(3)·5H_(2)O为原料,采用溶剂热法制备出锌二次电池负极用Bi_(2)O_(3)@ZnO复合材料,利用XRD、SEM、ICP、Tafel、EIS和恒电流充放电等研究Bi_(2)O_(3)@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,Bi_(2)O_(3)@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Bi_(2)O_(3)@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。
The Bi_(2)O_(3)@ZnO composite for anode of zinc secondary battery was prepared by solvothermal method,using Zn(Ac)_(2)·2H_(2)O and Bi(NO_(3))_(3)·5H_(2)O as raw materials.The effects of bismuth content on the composition,structure and electrochemical properties of Bi_(2)O_(3)@ZnO composites were investigated by XRD,SEM,ICP,Tafel,EIS and galvanostatic charge/discharge methods.The results show that,when the Bi contents in Bi_(2)O_(3)@ZnO composites increase from 2.7% to 8.6% after calcined at 600℃ for 5 h,the corrosion potential of Bi_(2)O_(3)@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 Bi_(2)O_(3)@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.
作者
田忠良
郭春
赵泽军
汪滔
李铮
邓朝勇
TIAN Zhong-liang;GUO Chun;ZHAO Ze-jun;WANG Tao;LI Zheng;DENG Chao-yong(School of Metallurgy and the Environment,Central South University,Changsha 410083,China;Ximei Resources(Guangdong)Limited,Qingyuan 513055,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2021年第12期3583-3591,共9页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51974380)。
关键词
锌二次电池
锌负极
Bi含量
电化学性能
zinc secondary battery
zinc anode
Bi content
electrochemical performance
