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Abstract
In this study, Sm was adopted in order to completely replace the expensive Pr/Nd elements in the A2B7 type alloy. The results indicate that Sm is a favourable element for forming Ce2Ni7 type and Ce5Co19 type phases. With the increasing amount of Sm, the discharge capacity of the alloy retains a value of 283·3 mAh g−1 at the current density of 1200 mA g−1. The maximum discharge capacity of the alloys increases with the increasing Sm content when Mg content is relatively low. By optimising the composition and processing technology, the cycle life the alloy enhances from 74 cycles to more than 540 cycles, and the maximum discharge capacity also increases from 300 to 355 mAh g−1.
Acknowledgements
The authors acknowledge Mr Ajay Orpe for his help in consulting and polishing the paper language. Financial supports from Guangdong provincial high-tech development projects ‘Research of low self-discharge rate Ni-MH battery with RE-Mg base hydrogen storage alloy’, NSFC (No. 51101037), Pearl River Science and Technology Scholar Project of Guangzhou (No. 2014J2200094 and No. 2011J2200033), Double-Win Co. Ltd and Guangdong Technology Project for Strategic Burgeoning Industries (No. 2011A091105001) and KLGHEI (No. KLB11003) are appreciated.