Binder for electricity storage devices

Abstract

The present invention relates to a binder for electricity storage devices containing a salt of a polymer containing structural units derived from (i) an ethylenically unsaturated carboxylic acid monomer and (ii) an ethylenically unsaturated monomer having at least one group selected from a hydroxy group, a dialkylamino group, an acetyl group, a sulfo group, a phosphate group, or a cyano group and neutralized with a monoamine, a polyvalent amine having an amine value of less than 21, and/or an onium hydroxide; a slurry composition and an electrode, each of which uses this binder; an electricity storage device which is provided with this electrode; and the like.

1 . A binder for electricity storage devices, comprising:
 a salt of a polymer containing structural units derived from (i) an ethylenically unsaturated carboxylic acid monomer and (ii) an ethylenically unsaturated monomer having at least one group selected from a hydroxy group, a dialkylamino group, an acetyl group, a sulfo group, a phosphate group, or a cyano group, wherein the salt of the polymer is neutralized with a monoamine, a polyvalent amine having an amine value of less than 21, and/or an onium hydroxide.   
     
     
         2 . The binder according to  claim 1 , wherein the polyvalent amine has a molecular weight of 600 or less. 
     
     
         3 . The binder according to  claim 1 , wherein the monomer of (ii) has a solubility in water at 20° C. of 1 g/L or more. 
     
     
         4 . The binder according to  claim 1 , wherein the monomer of (ii) has an SP value of 11.5 (cal/cm 3 ) 1/2  or more. 
     
     
         5 . The binder according to  claim 1 , wherein the monomer of (ii) is a monomer represented by the following general formula [1]: 
       
         
           
           
               
               
           
         
         in the general formula [1], R 1  represents a hydrogen atom or a methyl group, Y 1  represents —O— or —NR 2 —, R 2  represents a hydrogen atom or a methyl group, and A 1  represents a monovalent group having at least one group selected from a hydroxy group, a dialkylamino group, an acetyl group, a sulfo group, a phosphate group, or a cyano group. 
       
     
     
         6 . The binder according to  claim 1 , wherein the monomer of (ii) is a monomer represented by the following general formula [2]: 
       
         
           
           
               
               
           
         
         in the general formula [2], R 1  represents a hydrogen atom or a methyl group, Y 1  represents —O— or —NR 2 —, R 2  represents a hydrogen atom or a methyl group, and A 2  represents an alkyl group having 1 to 10 carbon atoms and having 1 to 3 of any one of a group selected from a hydroxy group, a dialkylamino group, an acetyl group, a sulfo group, a phosphate group, or a cyano group; or a linear alkyl group having 3 to 36 carbon atoms and having 1 hydroxy group and 1 to 5 ester bonds in a chain thereof. 
       
     
     
         7 . The binder according to  claim 1 , wherein the salt of the polymer further contains a structural unit derived from (iii) a monomer having two or more polymerizable unsaturated groups. 
     
     
         8 . The binder according to  claim 1 , wherein, in a case where the polymer contains a structural unit(s) derived from a monomer(s) other than the monomers (i) and (ii), a total content of the structural unit(s) derived from the monomer(s) other than the monomers (i) and (ii) in the polymer is 10 mol % or less with respect to a total content of the structural units derived from the monomers (i) and (ii) in the polymer. 
     
     
         9 . A slurry composition for electricity storage devices, comprising the binder according to  claim 1 . 
     
     
         10 . An electrode for electricity storage devices, comprising the slurry composition according to  claim 9 . 
     
     
         11 . An electricity storage device comprising the electrode according to  claim 10 .