Influence of magnetic annealing on electrochemical performance of La_(0.67)Mg_(0.33)Ni_(3.0) hydride electrode alloy

摘要

A novel magnetic annealing assisted route was applied to improve the electrochemical properties of La_(0.67)Mg_(0.33)Ni_(3.0). The effects of magnetic annealing parameters, including annealing temperature, annealing time and magnetic induction density, on electrochemical performance of La_(0.67)Mg_(0.33)Ni_(3.0) hydride electrode alloys was investigated using L9 orthogonal array based on Taguchi method. Based on the analysis of signal to noise ratio and the variance, the optimum magnetic annealing parameters for La_(0.67)-Mg_(0.33)Ni_(3.0) hydride electrode alloy are determined to be IT, 1123 K, and 2 h. A confirmation test was conducted subsequently, and the results were found to be within the confidence interval. The discharge capacity, the cyclic stability and the electrochemical kinetics of the alloy electrode were noticeably improved by magnetic annealing.