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.
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