Electrolyte solution and secondary battery

Abstract

In a secondary battery wherein a positive electrode active material layer 2 and a negative electrode active material layer 3 are allowed to face each other via an electrolyte solution 1, there is used, as the electrolyte solution 1, a basic solvent containing a halogenated polyolefin dissolved therein.

What is claimed is:  
     
         1 . An electrolyte solution consisting of a basic solvent containing an alkali metal salt and a halogenated polyolefin both dissolved therein.  
     
     
         2 . An electrolyte solution according to  claim 1 , wherein the halogenated polyolefin is a fluorinated polyolefin.  
     
     
         3 . An electrolyte solution according to  claim 2 , wherein the fluorinated polyolefin is a copolymer containing a tetrafluoroethylene.  
     
     
         4 . An electrolyte solution according to  claim 1 , wherein the halogenated polyolefin is contained in a concentration of 0.1 to 20% by weight.  
     
     
         5 . An electrolyte solution according to  claim 1 , wherein the basic solvent further contains an aliphatic polyolefin dissolved therein.  
     
     
         6 . An electrolyte solution according to  claim 5 , wherein the aliphatic polyolefin is a saturated hydrocarbon having a carbon chain length of 6 to 24.  
     
     
         7 . An electrolyte solution according to  claim 5 , wherein the aliphatic polyolefin is contained in a concentration smaller than that of the halogenated polyolefin.  
     
     
         8 . A secondary battery using an alkali metal ion as a charge carrier and having a structure in which a positive electrode and a negative electrode are adjacent to each other via an electrolyte solution, in which secondary battery the electrolyte solution consists of a basic solvent containing an alkali metal salt and a halogenated polyolefin both dissolved therein.  
     
     
         9 . A secondary battery according to  claim 8 , wherein the halogenated polyolefin is a fluorinated polyolefin.  
     
     
         10 . A secondary battery according to  claim 9 , wherein the fluorinated polyolefin is a copolymer containing a tetrafluoroethylene.  
     
     
         11 . A secondary battery according to  claim 8 , wherein the halogenated polyolefin is contained in a concentration of 0.1 to 20% by weight.  
     
     
         12 . A secondary battery according to  claim 8 , wherein the basic solvent further contains an aliphatic polyolefin dissolved therein.  
     
     
         13 . A secondary battery according to  claim 8 , wherein the aliphatic polyolefin is a saturated hydrocarbon having a carbon chain length of 6 to 24.  
     
     
         14 . A secondary battery according to  claim 12 , wherein the aliphatic polyolefin is contained in a concentration smaller than that of the halogenated polyolefin.  
     
     
         15 . A secondary battery having a structure in which a positive electrode layer and a negative electrode layer are laminated via a separator and a liquid electrolyte is allowed to be present between the positive electrode layer and the negative electrode layer, in which secondary battery the liquid electrolyte is a plastisol containing an electrolyte salt.  
     
     
         16 . A secondary battery according to  claim 15 , wherein the plastisol is a dispersion of a halogenated polyolefin in a plasticizer.  
     
     
         17 . A secondary battery according to  claim 16 , wherein the halogenated polyolefin is a fluorinated polyolefin.  
     
     
         18 . A secondary battery according to  claim 16 , wherein the halogenated polyolefin is a copolymer containing tetrafluoroethylene.  
     
     
         19 . A process for producing a secondary battery, which comprises: 
 a step of laminating a positive electrode layer and a negative electrode layer via a separator,    a step of introducing a plastisol containing an electrolyte salt, between the positive electrode layer and the negative electrode layer,    a step of applying a voltage between the positive electrode layer and the negative electrode layer to heat part of the plastisol, and    a step of cooling the plastisol.    
     
     
         20 . A process according to  claim 19 , wherein the plastisol is a dispersion of a halogenated polyolefin in a plasticizer.  
     
     
         21 . A process according to  claim 20 , wherein the halogenated polyolefin is a fluorinated polyolefin.  
     
     
         22 . A process according to  claim 20 , wherein the halogenated polyolefin is a copolymer containing tetrafluoroethylene.