The influence of Co content on LaNi3.2-xMn03Cox (x=0.2∼0.8) Alloy Hydrogen Storage and Electrochemical Properties

AbstractThe cold crucible levitation melting prepared LaNi3.2-xMn03Cox (x = 0.2 ∼ 0.8) series alloys, the system of Co substitution of Ni on the alloy structure, hydrogen storage performance and electrochemical properties. XRD analysis showed that the cast alloy by the La2Ni7 phase, LaNi5 phase and LaNi3 phase composition; PCT test shows that with the Co substitution increases, the amount of the cast alloy of hydrogen first increased and then decreased, alloy hydrogen absorption and desorption plateau pressure changed little . Electrochemical tests show that as x increases the maximum discharge capacity of alloy electrodes decreases, the maximum discharge capacity Cmax by the x = 0.2 when 320.5mAh / g decreased to x = 0.8 when 286.6mAh / g, but the cycle stability significantly improved after 60 charge-discharge cycles, the alloy electrode capacity retention rate (S60) by the x = 0.2 and gradually increased to 72.9% when x = 0.8 at 84.9%