| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery electrode film useful for providing an electrode having an improved heat resistance, a longer life, and a greater capacity due to a smaller thickness by forming a metallic thin film on the surface of a biaxially oriented film of specific physical properties and made of a prescribed polyester-based resin. SOLUTION: A metallic (such as Al, Ni, etc.,) thin film of the thickness preferably 1-1000 nanometers, more preferably 10-1000 nanometers is formed on at least one surface of a biaxially oriented film of the following properties: made of polyester-based resin (such as polyethylene terephthalate, polyethylene 2,6-naphthalate), the thickness is 0.2-30 micrometers, preferably 0.2-20 micrometers, more preferably 0.5-15 micrometers, specially preferably 0.9-10 micrometers, the Young's modulus is 500kg/mm<2> or greater, preferably 600kg/mm<2> or greater, and the melting peak temperature by DSC temperature rise measurement is 200 deg.C or higher, preferably 230 deg.C or higher. |
