Effects of conductive ceramic on the electrochemical performance of ZnO for Ni/Zn rechargeable battery
Effects of conductive ceramic on the electrochemical performance of ZnO for Ni/Zn rechargeable battery
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DOI：
10.1016/j.electacta.2008.02.087
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发表时间：
2008-06
影响因子：
6.6
通讯作者：
Liqiang Zhang;H. Huang;W. Zhang;Y. Gan;C. T. Wang
中科院分区：
文献类型：
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作者：
Liqiang Zhang;H. Huang;W. Zhang;Y. Gan;C. T. Wang
采用均匀沉淀法制备了一种新型的氧化锌/导电陶瓷纳米复合材料。采用球磨和表面改性工艺制备了以(ZnO)0.92(Bi2O3)0.054(Co2O3)0.025(Nb2O5)0.00075(Y2O3)0.00025，为成核中心的导电陶瓷，并通过充放电循环、慢速循环伏安和交流阻抗谱研究了其对氧化锌电化学性能的影响。与纯氧化锌相比，氧化锌/导电陶瓷电极具有更好的电化学性能，如更好的循环稳定性、更高的放电容量和利用率。当导电陶瓷含量达到14wt.%时，纳米氧化锌/导电陶瓷复合材料的放电容量在50次循环测试后几乎没有下降，平均利用率可达99.5%，循环测试后电极没有明显的重量损失。
A novel ZnO/conductive-ceramic nanocomposite was prepared by a homogeneous precipitation method. The conductive ceramic with the nominal chemical composition of (ZnO)0.92(Bi2O3)0.054(Co2O3)0.025(Nb2O5)0.00075(Y2O3)0.00025, as the nucleation sites of ZnO, was prepared by ball milling and surface modification process and its effects on electrochemical performance of ZnO were investigated by charge/discharge cycling, slow rate cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Compared with pure ZnO, the ZnO/conductive-ceramic electrode exhibited improved electrochemical properties, such as superior cycle stability, higher discharge capacity and utilization ratio. When the conductive ceramic content reached 14wt.%, the discharge capacity of the ZnO/conductive-ceramic nanocomposite hardly declined over 50 cycling test, the average utilization ratio could reach 99.5%, and the electrodes had no obvious weight loss after cycling tests.