Cable-type secondary battery

摘要

The present invention relates to a cable-type secondary battery comprising a polymer electrolyte having a first electrolyte layer comprising a mixture of a first polymer and a first organic electrolyte solution in a weight ratio of 50:50 and 80:20; and a second electrolyte layer formed on at least one surface of the first electrolyte layer and comprising a mixture of a second polymer and a second organic electrolyte solution in a weight ratio of 20:80 and 50:50. Since the multiple-layered polymer electrode film of the present invention exhibits good characteristics in terms of both mechanical property and ionic conductivity, the cable-type secondary battery comprising the same according to the present invention has superior battery performances and flexibility, as well as good strength for withstanding external impact.

主权项

1. A cable-type secondary battery, comprising:
an inner electrode having an open-structured inner current collector and an inner electrode active material layer coated on the surface of the inner current collector; an electrolyte layer surrounding the inner electrode, the electrolyte layer being a polymer electrolyte film; an outer electrode having an outer electrode active material layer surrounding the outer surface of the electrolyte layer and an outer current collector surrounding the outer electrode active material layer; and a protection coating disposed to surround the outer electrode, wherein the polymer electrolyte film has a first electrolyte layer comprising a mixture of a first polymer and a first organic electrolyte solution in a weight ratio of 50:50 and 80:20; and a second electrolyte layer formed on at least one surface of the first electrolyte layer and comprising a mixture of a second polymer and a second organic electrolyte solution in a weight ratio of 20:80 and 50:50, wherein the first polymer is a non-crosslinked polar polymer selected from the group consisting of polyacrylonitrile, polyvinyl chloride, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethyleneimine, polymethyl metacrylate, polybutyl acrylate, polyvinyl pyrrolidone, polyvinyl acetate, ethylene-vinyl acetate copolymer, and a mixture thereof, and wherein the second polymer is selected from a non-crosslinked polar polymer, a non-crosslinked oxide-based polymer, a crosslinked polymer structure, and a mixture thereof, wherein the non-crosslinked polar polymer is selected from the group consisting of polyacrylonitrile, polyvinyl chloride, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethyleneimine, polymethyl metacrylate, polybutyl acrylate, polyvinyl pyrrolidone, polyvinyl acetate, ethylene-vinyl acetate copolymer, and a mixture thereof.