Low-Temperature Hydrogen Storage Alloy and Its Application in Ni-MH Battery
来源期刊：JOURNAL OF RARE EARTHS2004年第6期
论文作者：吴朝玲 涂铭旌 付春艳 陈云贵 陶明大
Key words：hydrogen storage alloy; low-temperature performances; aggression analysis; Ni-MH battery; rare earths;
Abstract: Rare earth compositions, La, Ce and Pr in Mm(NiCoMnAl)5 hydrogen storage alloy, were arranged by uniform design method. The discharge performances and kinetics parameters including capacity, exchange current density, symmetry factor and hydrogen diffusion coefficient of the alloy at -40 ℃, were tested in standard tri-electrode cell. And linear regression method was used to analyze the effect of rare earth compositions on the performances of hydrogen storage alloys. The results show that the capacities of the alloys are positively correlative to the square of Ce content at -40 ℃ and under both 0.4 and 0.2C rate. The kinetics parameters and hydrogen diffusion coefficient indicate that the low-temperature performances of the alloys are mainly controlled by hydrogen diffusion process, and the surface electrochemical reaction affects the low-temperature performances to a certain extent. The low-temperature discharge capacities of the battery were also tested. The results show excellent low-temperature performances.The battery delivers 69.6% of its room-temperature capacity at -40 ℃ and 0.2C rate, 77.7% at -40 ℃ and 0.4C rate, 59.1% at -45 ℃ and 0.2C rate.
吴朝玲1，涂铭旌1，付春艳1，陈云贵1，陶明大1
(1.School of Materials Science and Engineering, Sichuan University, Chengdu 610064,China)
Abstract:Rare earth compositions, La, Ce and Pr in Mm(NiCoMnAl)5 hydrogen storage alloy, were arranged by uniform design method. The discharge performances and kinetics parameters including capacity, exchange current density, symmetry factor and hydrogen diffusion coefficient of the alloy at -40 ℃, were tested in standard tri-electrode cell. And linear regression method was used to analyze the effect of rare earth compositions on the performances of hydrogen storage alloys. The results show that the capacities of the alloys are positively correlative to the square of Ce content at -40 ℃ and under both 0.4 and 0.2C rate. The kinetics parameters and hydrogen diffusion coefficient indicate that the low-temperature performances of the alloys are mainly controlled by hydrogen diffusion process, and the surface electrochemical reaction affects the low-temperature performances to a certain extent. The low-temperature discharge capacities of the battery were also tested. The results show excellent low-temperature performances.The battery delivers 69.6% of its room-temperature capacity at -40 ℃ and 0.2C rate, 77.7% at -40 ℃ and 0.4C rate, 59.1% at -45 ℃ and 0.2C rate.
Key words:hydrogen storage alloy; low-temperature performances; aggression analysis; Ni-MH battery; rare earths;
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