Electrical storage device electrode binder composition, electrical storage device electrode slurry, electrical storage device electrode, and electrical storage device

Abstract

An electrode binder composition that is used to produce an electrode used for an electrical storage device, includes (A) a polymer, (B) a carboxylic acid or a salt thereof, and (C) a liquid medium, and has a concentration of the carboxylic acid or a salt thereof (B) of 20 to 1000 ppm.

1 . An electrical storage device electrode binder composition that is used to produce an electrode used for an electrical storage device, the binder composition comprising (A) a polymer, (B) a carboxylic acid or a salt thereof, and (C) a liquid medium, the polymer (A) being polymer alloy particles formed of an interpenetrating polymer network (IPN) that includes (Aa) a polymer that includes a repeating unit derived from at least one compound selected from a group consisting of vinylidene fluoride, tetrafluoroethylene, and hexafluoropropylene, and (Ab) a polymer that includes a repeating unit derived from an unsaturated carboxylic acid ester, the polymer (Aa) and the polymer (Ab) not being covalently bonded, and the binder composition having a concentration of the carboxylic acid or a salt thereof (B) of 20 to 1000 ppm. 
     
     
         2 . The electrical storage device electrode binder composition according to  claim 1 , wherein the polymer alloy particles have only one endothermic peak within a temperature range of −50 to +250° C. when subjected to differential scanning calorimetry (DSC) in accordance with JIS K 7121. 
     
     
         3 . The electrical storage device electrode binder composition according to  claim 2 , wherein the polymer alloy particles have the only one endothermic peak within a temperature range of −30 to +30° C. 
     
     
         4 . The electrical storage device electrode binder composition according to  claim 1 , wherein the polymer alloy particles include the polymer (Aa) in an amount of 1 to 60 parts by mass based on 100 parts by mass of the polymer alloy particles. 
     
     
         5 . The electrical storage device electrode binder composition according to  claim 1 , wherein the polymer alloy particles have a number average particle size of 50 to 400 nm. 
     
     
         6 . An electrical storage device electrode binder composition that is used to produce an electrode used for an electrical storage device, the binder composition comprising (A) a polymer, (B) a carboxylic acid or a salt thereof, and (C) a liquid medium, the polymer (A) being diene polymer particles that include (a) a repeating unit derived from a conjugated diene compound, (b) a repeating unit derived from an aromatic vinyl compound, (c) a repeating unit derived from a (meth)acrylate compound, and (d) a repeating unit derived from an unsaturated carboxylic acid, and the binder composition having a concentration of the carboxylic acid or a salt thereof (B) of 20 to 1000 ppm. 
     
     
         7 . The electrical storage device electrode binder composition according to  claim 6 , wherein the diene polymer particles have only one endothermic peak within a temperature range of −50 to +5° C. when subjected differential scanning calorimetry (DSC) in accordance with JIS K 7121. 
     
     
         8 . The electrical storage device electrode binder composition according to  claim 6 , wherein the diene polymer particles have a number average particle size of 50 to 400 nm. 
     
     
         9 . An electrical storage device electrode slurry comprising the electrical storage device electrode binder composition according to  claim 1 , and an electrode active material. 
     
     
         10 . An electrical storage device electrode slurry comprising the electrical storage device electrode binder composition according to  claim 6 , and an electrode active material. 
     
     
         11 . An electrical storage device electrode comprising a collector, and a layer that is formed by applying the electrical storage device electrode slurry according to  claim 9  to a surface of the collector, and drying the slurry. 
     
     
         12 . An electrical storage device electrode comprising a collector, and a layer that is formed by applying the electrical storage device electrode slurry according to  claim 10  to a surface of the collector, and drying the slurry. 
     
     
         13 . An electrical storage device comprising the electrical storage device electrode according to  claim 11 . 
     
     
         14 . An electrical storage device comprising the electrical storage device electrode according to  claim 12 .