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）.
