不同镍盐合成的球形β-Ni(OH)_2的充放电特性与结构变化规律

Abstract

采用均匀络合共沉淀法 ,以不同的镍盐分别合成出了球形 β Ni(OH) 2 ,并对其充放电循环及循环伏安特性进行了研究 .发现由不同盐合成的Ni(OH ) 2 其电化学性能有较大差别 ,用NiSO4合成的Ni(OH) 2 放电比容量高 ,循环寿命较好 ,平台电位也高于用Ni(NO3) 2 合成的Ni(OH) 2 .根据X射线 (XRD)分析和傅立叶变换红外 (FTIR)图谱对存在差别的原因进行分析 ,为原料的选择提供了理论依据

Spherical β Ni(OH) 2 was prepared from different nickel salt by homogeneous complexing precipitation method. Its charge/discharge and cyclic voltammetry properties were studied. The authors found that there are many differences in the electrochemical properties of the prepared Ni(OH) 2.The specific capacity, cycling life and the discharging plateau of the material prepared from NiSO 4 were superior to those of the material prepared from Ni(NO 3) 2.The reasons of the differences were analyzed by XRD and FTIR measurements, which will become abasis for the selection of raw materials.