Characteristic Investigation of Nano-Crystal Hydrogen Storage Alloys

【Author】

Xiao Fangming Huang Lili Tang Renheng Lu Qiyun Peng Neng Wang Ying (Rare Earth Materials Research Center, Guangzhou Research Institute of Nonferrous Metals, Guangzhou 510651, China)

【Abstract】

<正> A Ml(NiCoMnAl)5 hydrogen storage alloys was prepared by double-roller rapid quenching. Its microstruc ture, electrochemically and kinetic characteristic were studied. A uniform crystal phase with CaCu5 structure could be detected by XRD analyses, whose average grain size is 30-50 nm and the ratio of c/a of nano-crystal hydrogen storage alloy is larger. The hydrogen absorption/desertion p-C isotherms of alloy show that its flat-performance is perfect and the magnetic stagnant effect is very little. An simulate cell is used for electrochemical measurement. Electrode is charged at 300 mA ·g-1 (1C), then discharged at 2000 mA ·g-1 (7C) and 3000 mA ·g-1 (10C) to cut off potential of 0.9, 0.8 V, respectively. Electrochemically capacity reaches 250 and 230 mAh ·g-1 at the discharge ratio of 7C and 10C, the capacity decreasing rate via the 450 cycles at 7C is less than 20%.

【Keywords】

nano-crystal; hydrogen storage alloys; electrochemically characteristic

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