Battery

Abstract

A battery capable of improving the energy density and improving the battery characteristics such as cycle characteristics and high temperature storage characteristics is provided. A cathode and an anode are oppositely arranged with a separator in between. The open circuit voltage in full charge is in the range from 4.25 V to 6.00 V. The separator has a base material layer and a surface layer. The surface layer opposed to the cathode is formed from at least one from the group consisting of polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, and aramid.

1 . A battery in which a cathode and an anode are oppositely arranged with a separator in between, 
 wherein an open circuit voltage in a full charge state per a pair of the cathode and the anode is in the range from 4.25 V to 6.00 V, and    at least part of the cathode side of the separator is made of at least one from the group consisting of polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, and aramid.    
   
   
       2 . The battery according to  claim 1 , wherein the separator has: a base material layer made of a polyolefin porous film; and a surface layer which is provided on the cathode side of the base material layer, and is made of at least one from the group consisting of polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, and aramid.  
   
   
       3 . The battery according to  claim 2 , wherein the base material layer contains at least one of polyethylene and polypropylene.  
   
   
       4 . The battery according to  claim 1 , wherein the anode contains a carbon material.  
   
   
       5 . The battery according to  claim 1 , wherein the anode contains at least one from the group consisting of graphite, graphitizable carbon, and non-graphitizable carbon.