ELECTROCHEMICAL PERFORMANCES OF M1_(1-x)Ca_x(Ni,Co,Al)_5 HYDROGEN STORAGE ALLOYS

Acta Metall Sin

1998, Vol. 34

Issue (6): 640-644 DOI:

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ELECTROCHEMICAL PERFORMANCES OF M1_(1-x)Ca_x(Ni,Co,Al)_5 HYDROGEN STORAGE ALLOYS

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CHEN Weixiang; LIU Wei; CHEN Yun; PAN Hongge; CHEN Changpin(Department of Materials Science and Engineering; Zhejiang University; Haugzhou 310027)Comspondent: CHEN Weixiang ; post-doctor Tel: (0571)7951406; Fan(0571)7951152. ELECTROCHEMICAL PERFORMANCES OF M1_(1-x)Ca_x(Ni,Co,Al)_5 HYDROGEN STORAGE ALLOYS. Acta Metall Sin, 1998, 34(6): 640-644.

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Abstract The effects of the Ca content in M11-x Ca (Ni, Co,Al) 5 hydrogen storage alloys on the electrochendcal performances of hydride electrodes were investigated. It was found that when the Ca cobment in alloys increased, the electrodes actiVation poverty was approved but their cycling durability deCr~d. At x=0.1, alloy has the most discharge capaCity of 331 mAh.g--'(C/3). MIO.sCaO.,(Ni,Co,AI)s and Mfo.sCaO.:(Ni,Co,AI)s alloys have better high--rate dischargeability at iC and ZC rates. At x <0.3, the plateau pressures of the hydrogen storage alloys increases with increasing x. But the plateau pressure of Mad.6CaO.4(Ni,Co,AI)~ alloy is slight lower than that of Mad.:CaO.3(Ni,Co,AI)5 alloy.

Key words: hydrogen storage alloy hydride electrode calcium cycling durability plateau pressure

Received: 18 June 1998

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1998/V34/I6/640

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