关键词:

非晶态氢氧化镍, 快速冷冻沉淀法, Fe（Ⅲ）和Al（Ⅲ）复合掺杂, 电极材料与性能

Abstract:

Amorphous nickel hydroxide powders codoped by Fe(Ⅲ) and Al(Ⅲ) were prepared by the method of deep freeze deposition. The microstructure and morphology of sample were characterized by XRD, SAED, SEM, Raman spectrometry, TG-DSC and IR, and the electrochemical properties were tested by using a simulated MH-Ni battery composed of amorphous nickel hydroxide particles as active material. The results showed many structure defects, uniform size, and a large amount of crystal water. To investigate the effect of codoped Fe(Ⅲ) and Al(Ⅲ) on the electrochemical performance of the samples, simulated batteries with the prepared codoped nickel hydroxide as cathode active material were assembled. When the charging current, discharging current and end potential were respectively 80 mA·g^-1 for 5.5 h, 40 mA·g^-1 and 1.0 V, the specific capacity was 357.6 mAh·g^-1 and the sample had longer discharge time at 1.30 V. In addition, the stability and reversibility of the Fe(Ⅲ) and Al(Ⅲ) codoped samples were good during the charge/discharge process, and the electrochemical impedance was small.

Key words:

非晶态氢氧化镍, 快速冷冻沉淀法, Fe（Ⅲ）和Al（Ⅲ）复合掺杂, 电极材料与性能