La(III)与Sr(II)复合掺杂非晶态氢氧化镍电化学性能研究

Investigations on Electrochemical Performance of La(III) and Sr(II) Codoped Amorphous Nickel Hydroxide

采用微乳液快速共沉淀法制备稀土La(III)与Sr(II)复合掺杂非晶态氢氧化镍粉体。样品材料的微观结构和形貌采用XRD,Raman光谱和SEM进行表征分析。将样品作为电极活性材料,组装成MH-Ni模拟电池,研究了稀土La(III)和Sr(II)复合掺杂对氢氧化镍电极材料电化学性能的影响及其相应的作用机理。实验结果发现,在0.1 C恒电流放电,终止电压为1.0 V的放电制度下,La(III)和Sr(II)复合掺杂样品的放电平台为1.265 V,放电容量为340.56mAh.g-1,且电极材料在充放电过程中的稳定性和循环可逆性较好,并能有效抑制析氧反应的发生。

Amorphous nickel hydroxide codoped with La（Ⅲ） and Sr（Ⅱ） has been synthesized by mi- croemulsion method. The microstructure and morphology of the sample were characterized by XRD, Raman, and SEM. To investigate the effect of La（Ⅲ） and Sr（Ⅱ） codoping on the electrochemical performance of the samples, simulated batteries with the prepared codoping nickel hydroxide as cathode active material and metal hydride as counter electrode were assembled. At the 0.1 C rate, the dis- charge platform was 1. 265 V and the specific discharge capacity was 340.56 mAh g-1 for the La（Ⅲ） and Sr（Ⅱ） codoped sample. In addition, the stability and reversibility of the La（Ⅲ） and Sr（Ⅱ） codoped sample was relatively good and the oxygen evolution was impeded during the charge/discharge process.