Patent ID: 6287724
Filing Date: 2001-09-11
Classification: H01M,Y02E,Y02P

Abstract:
A metal hydride electrochemical cell comprising a positive electrode, a negative electrode comprising a hydrogen storage metal alloy material, and an electrolyte, wherein said cell discharges in a test discharge at a discharge rate of from about 8 C to about 18 C, wherein said voltage remains above 0.2 volts during the first half of said discharge curve and wherein said discharge is initiated at a cell temperature of 0.degree. C., said metal alloy having a particle size volume distribution whose d(50) value does not exceed a required maximum particle size defined as 2(2D.sub.h t).sup.1/2 wherein D.sub.h is the hydrogen diffusion coefficient for said alloy at 0.degree. C. and t is the time associated with said discharge rate.