纳米Bi_2O_3/BiO复合物表面包覆氧化锌的制备及电化学性能  

Preparation and Electrochemical Performance of Nanosized Bi_2O_3/BiO Compounds-Coated ZnO for Ni/Zn Secondary Battery

作　　者：李艳[1] 郭绍义[1] 陈红雷[2] 叶逢春[1] 李果林[1] 杨金林[1] 袁永锋[1] 

机构地区：[1]浙江理工大学机械与自动控制学院,杭州310018 [2]杭州太阳铸造工程技术有限公司,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2010年第2期259-263,共5页Journal of Zhejiang Sci-Tech University(Natural Sciences)

摘　　要：基于Bi(NO3)3水解反应制备了纳米铋复合物表面包覆ZnO,采用透射电镜(TEM)和X射线衍射仪(XRD)对表面包覆ZnO进行微结构和物相分析,发现氧化锌表面被直径约50 nm的颗粒(Bi2O3和Bi O)包覆,通过恒流充放电法和循环伏安法对表面包覆ZnO进行电化学测试,结果表明铋对ZnO的表面包覆提高了电极循环稳定性,保持了ZnO的电化学活性。与Bi2O3物理混合ZnO相比,质量分数Bi 9.3%的表面包覆ZnO放电容量增加了132 mAh g-1,平均利用率提高了27%,具有较好的性能。Surface-modified ZnO with nanosized Bi2O3/BiO compounds is prepared by the hydrolyz tion reaction of Bi（NO3）3. The characteristics of surface-coated ZnO are analyzed by transmission electron microscopy （TEM） and X-ray diffraction （XRD）, and the results reveal that some nanoparticles with a- bout 50 nm in diameter are modified on ZnO. The constant current charge-discharge test and cyclic voltam- metry of the ZnO electrode show that bismuth modifying on the surface of ZnO enhances the cycle stability of the electrode, maintains the electrochemical activity of ZnO, and increases the discharge capacity and average utilization respectively. In comparison with the untreated ZnO, discharge capacity and average utilization of ZnO coated by 9.3 wt % Bi increase 132 mAh g^-1 and 27%.

关 键 词：表面包覆 Bi复合物 循环稳定性 锌镍电池 

分 类 号：TM912.2[电气工程—电力电子与电力传动]