نبذة مختصرة : The Al and Y elements co-doped α-Ni(OH) 2 materials were prepared by a chemical complexing precipitation method. The physical properties and structures of these materials were characterized, and their electrochemical performance as a cathode for Ni-MH batteries was measured. The results show that Al and Y elements partially replaced Ni atoms in the layers and attracted more anions between interlayers, thereby neutralizing the positive charge and stabilizing the structure. Therefore, the Al and Y elements co-doped α-Ni(OH) 2 cathode displays excellent reaction reversibility, low electrochemical resistance, and fast diffusion rate. Besides, the cycling stability indicates that the discharge capacity and the activation rate are improved by adding Y element. The sample containing 2 atom % Y has the highest capacity of 388 mAh g –1 at 1 C rate, and it has great rate performance and great cycle stability. This is a promising material as a cathode applied in Ni-MH batteries.
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