SEPARATOR FOR NON-AQUEOUS ELECTROLYTE BATTERY AND NON-AQUEOUS ELECTROLYTE BATTERY
A separator is made by using a copolymer for the separator including a monomer component derived from an olefin compound containing a fluorine atom and a monomer component derived from a polymerizable organic compound containing an oxygen atom in its molecule. This separator is excellent in resistance to oxidation and wettability to electrolytes. Therefore, by making a non-aqueous electrolyte battery using this separator, charge and discharge cycle life and storage characteristics of the battery improve. Further, similar effects can be obtained by using this separator, even in the case of a non-aqueous electrolyte battery using a high-potential positive electrode active material.
1 . A separator for a non-aqueous electrolyte battery, comprising a resin film including a copolymer of an olefin compound containing a fluorine atom in its molecule, and a polymerizable organic compound containing an oxygen atom in its molecule.
2 . The separator for a non-aqueous electrolyte battery in accordance with claim 1 , wherein the copolymer contains at least one carbonyl group in its molecule.
3 . The separator for a non-aqueous electrolyte battery in accordance with claim 2 , wherein a hydrogen atom is not bonded to the α-position atom adjacent to the carbon atom of the carbonyl group.
4 . The separator for a non-aqueous electrolyte battery in accordance with claim 1 , wherein a hydrogen atom is not bonded to the carbon atom in the main-chain of the copolymer.
5 . The separator for a non-aqueous electrolyte battery in accordance with claim 1 , wherein the olefin compound containing a fluorine atom in its molecule is perfluoroolefin, and the polymerizable organic compound containing an oxygen atom in its molecule is carbon monoxide.
6 . The separator for a non-aqueous electrolyte battery in accordance with claim 1 , wherein an olefin compound is substituted at a terminal position of the copolymer and the olefin compound is perfluoroolefin.
7 . The separator for a non-aqueous electrolyte battery in accordance with claim 6 , wherein the perfluoroolefin is tetrafluoroethylene.
8 . A non-aqueous electrolyte battery including the separator for a non-aqueous electrolyte battery in accordance with claim 1 .