Effect of annealing treatment on hydrogen storage properties of La-Ti-Mg-Ni-based alloy

蒋卫卿¹，莫晓华²，韦银燕¹，周正诚¹，郭进^1,3

1. Key Laboratory of National Education Ministry for Nonferrous Metals and Materials Processing Technology,College of Physics Science and Technology,Guangxi University2. College of Physics and Electronic Engineering,Guangxi University for Nationalities3. International Centre for Materials Physics,Chinese Academy of Sciences

摘 要：The present study dealt with investigations on the effects of annealing on the hydrogen storage properties of La 1.6 Ti 0.4 MgNi 9 alloys.The experimental alloys were prepared by magnetic levitation melting followed by annealing treatment.For La 1.6 Ti 0.4 MgNi 9 alloys,LaNi 5,LaNi 3 and LaMg 2 Ni 9 were the main phases,Ti 2 Ni phase appeared at 900℃.Annealing not only enhanced the maximum and effective hydrogen storage capacity,improved the hydrogen absorption/desorption kinetics,but also increased the discharge capacity.The cyclic stability had been improved markedly by annealing,e.g.,when the discharge capacity reduced to 60% of maximum discharge capacity,the charge/discharge cycles increased from 66（as-cast） to 89（annealed at 800℃） and 127 times（annealed at 900℃）.La 1.6 Ti 0.4 MgNi 9 alloy annealed at 900℃ exhibited better electrochemical properties compared to the other two alloy electrodes.

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