Patent ID: 9620807
Date: 2017-04-11
CPC Classifications: H01M,Y02E,Y02P,Y02T

Claim:
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 electrolyte layer has the tensile strength from 0.3 MPa to 6.0 MPa at 200% strain and the ionic conductivity from 2.0×10 the second electrolyte layer has the tensile strength from 0.003 MPa to 0.011 MPa at 50% strain and the ionic conductivity from 3.0×10