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Crystal structure and electrochemical performance of La_(0.75)Ce_(0.25)Ni_(3.46^-)Al_(0.17)Mn_(0.04)Co_(1.33) alloy for high-power-type 29 Ah Ni-MH battery 被引量:2
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作者 栗欢欢 费扬 +2 位作者 王亚平 陈龙 江浩斌 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第6期633-638,共6页
An AB5 type alloy, La0.75Ce0.25Ni3.46A10.17Mn0.04COl.33, was successfully prepared via partial substitution of Ce for La and A1, Mn, Co for Ni, respectively. The structure, morphology, and chemical composition of the ... An AB5 type alloy, La0.75Ce0.25Ni3.46A10.17Mn0.04COl.33, was successfully prepared via partial substitution of Ce for La and A1, Mn, Co for Ni, respectively. The structure, morphology, and chemical composition of the as-obtained alloy powders were care- fully examined by X-ray diffraction, scanning electron microscopy equipped with energy dispersive X-ray spectroscopy. Electro- chemical properties of the hydrogen storage alloy were systematically investigated in standard 29 Ah Ni-MH batteries. The 29 Ah Ni-MH battery exhibited a theoretical discharge capacity of 29 Ah at 1 C. The capacity retention was 99% after 2000 cycles. Fur- thermore, excellent low temperature performance of this hydrogen storage alloy was obtained at -25 ~C. And the results showed that it exhibited not only high discharge capacity (21 Ah at -25 ~C and 1 C), excellent high current densities instantaneous discharge performance (discharge 0.9 Ah in 10 s at 12.5 C rate and the voltage could be maintained around 0.73 V), but also remarkable high-rate discharge capacity (discharge 17.7 Ah at 50% SOC and 6.25 C, and the voltage could be maintained around 0.95 V). 展开更多
关键词 hydrogen storage alloy ni-metal-hydride battery microstnacture low temperature property electrochemical performance rare earths
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