Patent ID: 6074785
Filing Date: 2000-06-13
Classification: H01M,Y02E

Abstract:
A nickel/metal hydride storage battery comprising:a positive electrode comprising an active material composed mainly of nickel hydroxide;a negative electrode composed mainly of a hydrogen-absorbing alloy, an alkali electrolyte and a separator,wherein the nickel hydroxide contains as a solid solution at least one transition metal selected from the group consisting of Mn, Cr and Co, in a proportion of 2 to 20 atomic % based on the amount of the nickel hydroxide in terms of metallic nickel, and the crystal structure of the nickel hydroxide at charged state is a hexagonal or tetragonal system which has a diffraction peak of 2.theta. on (00l) plane of .beta.-NiOOH at an angle of approximately 15.degree.-19.degree. in X-ray diffraction using CuK.alpha. as a source and has a regular array with a NaCl type structure,wherein the alkali electrolyte comprises an aqueous sodium hydroxide solution having a concentration of 8 to 12 mol/l, and the nickel hydroxide contains Mn as a solid solution in a proportion of 8 to 20 atomic % based on the amount of the nickel hydroxide in terms of metallic nickel.