METALLIC ALLOY FOR HYDROGEN STORAGE OF NI-MH BATTERY AND MANUFACTURING METHOD OF THE SAME

摘要

A hydrogen storage alloy for a Ni-MH battery, and a method for preparing the hydrogen storage alloy are provided to reduce the cost due to the use of Co by decreasing the amount of Co and to improve the pressure resistance of a battery. A hydrogen storage alloy comprises a mischmetal alloy containing La and Ce; and a hydrogen activator containing Ni, Co, Mn and Al, wherein the content of Co is 0.5 at% or less, and the content of least one of Mn and Al is 0.5 at% or more. The hydrogen storage alloy is prepared by (S1) mounting an alloy which comprises a mischmetal alloy containing La and Ce and a hydrogen activator containing Ni, Co, Mn and Al to an arc furnace; (S3) arc melting it; (S7) pulverizing the alloy to prepare a hydrogen storage alloy powder; (S9) mixing the powder with carbon black to make a slurry and coating it on a nickel sheet; (S11) drying the slurry coated on the nickel sheet and dipping the dried slurry in a PTFE solution; and (S13) re-drying the slurry dipped in a PTFE solution and rolling it.