Patent ID: 6194099
Filing Date: 2001-02-27
Classification: H01M,Y02E,Y10T

Abstract:
A solid composite cathode for use in an electric current producing cell, said solid composite cathode comprising:(a) an electrically conductive cathode coating layer comprising (i) an electroactive sufur-containing material which, in its oxidized state, comprises a polysulfide moiety of the formula, -S.sub.m -, wherein m is an integer from 3 to 10; and (ii) one or more conductive fillers other than a non-activated carbon nanofiber; and(b) non-activated carbon nanofibers, wherein said carbon nanofibers have a specific surface area of less than 600 m.sup.2 /g, and an aspect ratio of at least 20, and wherein individual carbon nanofibers form a random, three dimensional, microporous network in said cathode coating layer;wherein said cathode coating layer comprises 50% or greater by weight of said electroactive sulfur-containing material, and the weight ratio of said carbon nanofibers to said electroactive sulfur-containing material in said cathode coating layer is in the range of 0.01:1 to 0.1:1.