钕掺杂非晶态Ni(OH)_2的电化学性能

Electrochemical Performances of Neodymium-Substituted Amorphous Ni(OH)_2

采用微乳液快速冷冻沉淀法制备出Nd掺杂非晶态氢氧化镍粉体材料,采用Raman,XRD,SEM和IR对其结构形态进行了表征分析,并对其交流阻抗谱(EIS)和充放电性能进行了测量。结果发现,Nd的掺入使非晶态氢氧化镍结构缺陷增多,无序性增强,电化学反应的电荷转移电阻降低,材料的电化学性能和结构稳定性提高。样品作为MH-Ni电池正极材料在恒流80 mA.g-1下充电5 h,40 mA.g-1放电,终止电压为1.0 V时,放电电压稳定于1.240 V,开路电位为1.474 V,放电容量高达348.89 mAh.g-1,并具有优良的电化学循环性能。

Nd-substituted amorphous nickel hydroxide powder was prepared by the method of rapid freezing precipitation of micro-emulsion. The structure and morphology of the sample material were analyzed using XRD, SEM, Raman spectra and IR. Charge-discharge performance and electrochemical impedance spectroscopy （EIS） were also studied. It was found that, with Nd doping, the faults and randomness of amorphous nickel hydroxide were increased, the charge transfer resistance was decreased, and the electrochemical performance and stability of the structure were improved. As the anode material of MH-Ni battery, when it was charged at 80 mA·g^-1 for 5 h and discharged at 40 mA·g^-1 to 1.0 V, the discharge voltage maintained at 1. 240 V, the open circuit voltage was 1. 474 V and the discharge specific capacity reached as high as 348.89 mAh·g^-1, and it also had a better cycling performance.