Binder composition for non-aqueous secondary battery electrode

Abstract

Disclosed is a binder composition for a non-aqueous secondary battery electrode, which enables the production of a non-aqueous secondary battery that has excellent adhesion to a current collector or an electrode and can retain a high electric discharge capacity even when charge and discharge are repeated or under a high-temperature environment produced as a result of the generation of heat. Specifically disclosed is a binder composition for a non-aqueous secondary battery electrode, which comprises functional group-containing crosslinked resin microparticles produced by polymerizing the following components (A) to (C): (A) at least one monomer selected from the group consisting of (a) a monomer having one ethylenically unsaturated group per molecule and also having a monofunctional or polyfunctional epoxy group, (b) a monomer having one ethylenically unsaturated group per molecule and also having a monofunctional or polyfunctional amide group, and (c) a monomer having one ethylenically unsaturated group per molecule and also having a monofunctional or polyfunctional hydroxy group; (B) at least one monomer selected from the group consisting of (d) a monomer having one ethylenically unsaturated group per molecule and also having an alkoxysilyl group and (e) a monomer having at least two ethylenically unsaturated groups per molecule; and (C) (k) a monomer which has an ethylenically unsaturated group and is different from the monomers (a) to (e).

1 . A binder composition for a non-aqueous secondary battery electrode that contains fine particles of a functional group-containing cross-linkage type resin, wherein the fine particles of a functional group-containing cross-linkage type resin are fine particles of the resin obtained by emulsification polymerization of monomers having an ethylenically unsaturated group with a radical polymerization initiator in water in the presence of a surfactant, wherein the monomers having an ethylenically unsaturated group contains:
 (A) 0.1 to 20% by weight of at least one monomer that is selected from the group consisting of (a) a monomer having one ethylenically unsaturated group per molecule and also having a monofunctional or polyfunctional epoxy group, (b) a monomer having one ethylenically unsaturated group per molecule and also having a monofunctional or polyfunctional amide group, and (c) a monomer having one ethylenically unsaturated group per molecule and also having a monofunctional or polyfunctional hydroxide group;   (B) 0.1 to 5% by weight of at least one monomer that is selected from the group consisting of (d) a monomer having one ethylenically unsaturated group per molecule and also having a monofunctional or polyfunctional alkoxysilyl group, and (e) a monomer having two or more ethylenically unsaturated groups per molecule; and   (C) 75 to 99.8% by weight of (k) a monomer which has an ethylenically unsaturated group and is different from the monomers (a) to (e).   
     
     
         2 . The binder composition for a non-aqueous secondary battery electrode according to  claim 1 , wherein the (k) monomer having an ethylenically unsaturated group contains at least (m) a monomer having one ethylenically unsaturated group per molecule and also having a C 8-18  alkyl group and/or (n) a monomer having one ethylenically unsaturated group per molecule and also having a cyclic structure, wherein the monomers (m) and (n) are included in 30 to 95% by weight in sum in total monomers having an ethylenically unsaturated group ((a) to (e) and (k)). 
     
     
         3 . The binder composition for a non-aqueous secondary battery electrode according to  claim 1 , containing (D) a non-cross-linked compound that is selected from the group consisting of a non-cross-linked epoxy group-containing compound, a non-cross-linked amide group-containing compound, a non-cross-linked hydroxide group-containing compound, and a non-cross-linked oxazoline group-containing compound. 
     
     
         4 . A non-aqueous secondary battery electrode, which is obtained by using the binder composition for a non-aqueous secondary battery electrode according to  claim 1 . 
     
     
         5 . A non-aqueous secondary battery, which is obtained by using the non-aqueous secondary battery electrode according to  claim 4 . 
     
     
         6 . A non-aqueous secondary battery according to  claim 5 , wherein the non-aqueous secondary battery is a lithium ion secondary battery.