Electrode for secondary battery

Claim 1

An electrode for a secondary battery, comprising: a carrier doped with lithium or lithium containing another alkali metal as the active substance, said carrier composed of a mixture of (i) from 30 to 98% by weight of a carbonaceous material having a hydrogen/carbon (H/C) atomic ratio of less than 0.15, a spacing (d 002 ) of the (002) plane as determined by X-ray wide angle diffraction of 3.37 to 3.75 Å, a total fine pore volume of 1.5×10 -3 ml/g or more and a crystallite size in the c-axis direction (Lc) of 5 Å or more, and (ii) from 2 to 70% by weight of a conductive polymer composition composed of lithium ion or lithium containing another alkali metal and an ion conducting polymer selected from the group consisting of (A) a polymer gel electrolytic composition comprising (a) a vinyl series polymer, as a matrix polymer which is obtained by polymerizing a monomer selected from the group consisting of alkyl(meth)acrylates, (meth)acrylonitrile, vinyl acetate, N-vinyl lactams, (meth)acrylic acid, hydroxyalkyl(meth)acrylates, (meth)acrylamide, glycerin mono(meth)acrylate, polyalkylene glycol(meth)acrylates, alkoxypolyalkylene glycol mono(meth)acrylates and siloxane-modified polyalkylene glycol(meth)acrylates, (b) an orangic solvent, and (c) 1,3,2,4-dibenzylidene sorbitol derivatives having at least one -COOR group, wherein R represents a hydrocarbon group having 1 to 20 carbon atoms, and (B) a polymer composition comprising polyphosphazene represented by the formula: ##STR5## wherein R 1 and R 2 each represent an alkyl group having 1 to 6 carbon atoms, n is an integer of 5 or more and m is an integer of 1 to 100, said polymer composition having an ion conductivity at 20° C. or 10 -8 S/cm or greater.