Binder solution for all-solid-state battery, electrode slurry for all-solid-state battery comprising the same and method of manufacturing all-solid-state battery using the same

Abstract

A binder solution for an all-solid-state battery, an electrode slurry for an all-solid-state battery including the same and a method of manufacturing an all-solid-state battery using the same, and more particularly to a binder solution for an all-solid-state battery, in which a polymer binder configured such that a non-polar functional group is bonded to the end of a polar functional group is used, whereby the polar functional group is provided by a deprotection mechanism of the polymer binder through a thermal treatment, thus increasing adhesion between electrode materials to thereby improve battery capacity and enabling a wet process to thereby reduce manufacturing costs, an electrode slurry for an all-solid-state battery including the same and a method of manufacturing an all-solid-state battery using the same.

What is claimed is: 
     
         1 . A binder solution for an all-solid-state battery, comprising:
 a polymer binder comprising a compound containing an ester group of Chemical Formula 1 below; and   a solvent:
   R 1 —COO—R 2   [Chemical Formula 1]
 
   wherein in Chemical Formula 1:   R 1  is an alkyl group, a —OA group or a heterocyclic group, A is selected from the group consisting of an alkyl group, a heteroalkyl group, a cyclic group, a heterocyclic group, an aryl group, a heteroaryl group and combinations thereof, and   R 2  is —C(CH 3 ) 3  or —CH(CH 3 )OR 3 , wherein R 3  is selected from the group consisting of an ethyl group, an i-propyl group, a butyl group, a tert-butyl group and combinations thereof.   
     
     
         2 . The binder solution of  claim 1 , wherein the alkyl group of R 1  includes a repeating unit of 
       
         
           
           
               
               
           
         
         wherein: 
         n is an integer from 100 to 5000, inclusive, and * represents a bonding site), 
         R 4  is selected from the group consisting of hydrogen, an alkyl group, a halogen group and combinations thereof. 
       
     
     
         3 . The binder solution of  claim 1 , wherein the polymer binder is at least one selected from the group consisting of compounds represented by Chemical Formula 2 below to Chemical Formula 6 below, wherein n is an integer from 100 to 5000, inclusive, and * represents a bonding site: 
       
         
           
           
               
               
           
         
       
     
     
         4 . The binder solution of  claim 1 , wherein the polymer binder is at least one selected from the group consisting of compounds represented by Chemical Formula 7 below to Chemical Formula 10 below, wherein n is an integer from 100 to 5000, inclusive, and * represents a bonding site: 
       
         
           
           
               
               
           
         
       
     
     
         5 . The binder solution of  claim 1 , wherein the polymer binder is a compound re resented by Chemical Formula 11 below: 
       
         
           
           
               
               
           
         
         wherein in Chemical Formula 11: 
         n is an integer from 100 to 5000, inclusive, 
         represents a bonding site; and 
         R 3  is selected from the group consisting of an ethyl group, an i-propyl group, a butyl group, a tert-butyl group and combinations thereof. 
       
     
     
         6 . The binder solution of  claim 1 , wherein the polymer binder is a compound represented by Chemical Formula 12 below: 
       
         
           
           
               
               
           
         
       
     
     
         7 . The binder solution of  claim 1 , wherein the solvent is selected from the group consisting of butyrate, toluene, xylene, anisole, hexane, heptane, dibromomethane, dichloroethane, ethanol, glycol ether and combinations thereof. 
     
     
         8 . The binder solution of  claim 1 , wherein the binder solution comprises 2.5 to 45 wt % of the polymer binder and 55 to 97.5 wt % of the solvent. 
     
     
         9 . An electrode slurry for an all-solid-state battery, comprising:
 the binder solution of  claim 1 ;   an electrode active material;   a conductive material; and   a solid electrolyte.   
     
     
         10 . The electrode slurry of  claim 9 , wherein the electrode slurry comprises 0.1 to 10 wt % of the binder solution, 75 to 93 wt % of the electrode active material, 1 to 10 wt % of the conductive material and 5 to 25 wt % of the solid electrolyte. 
     
     
         11 . The electrode slurry of  claim 9 , wherein the solid electrolyte is a sulfide-based solid electrolyte. 
     
     
         12 . A method of manufacturing an all-solid-state battery, comprising:
 preparing the binder solution of  claim 1 ;   preparing an electrode slurry by mixing the binder solution, an electrode active material, a conductive material and a solid electrolyte; and   applying the electrode slurry on a substrate and performing a thermal treatment at a temperature of 100 to 250° C. for 1 min to 12 hr to form an electrode.   
     
     
         13 . The method of  claim 12 , wherein the electrode slurry comprises 0.1 to 10 wt % of the binder solution, 75 to 93 wt % of the electrode active material, 1 to 10 wt % of the conductive material and 5 to 25 wt % of the solid electrolyte. 
     
     
         14 . The method of  claim 12 , wherein, in the applying the electrode slurry, the polymer binder in the electrode is modified into a polymer binder containing a carboxyl group through the thermal treatment. 
     
     
         15 . The method of  claim 14 , wherein an amount of the carboxyl group of the polymer binder modified in the forming the electrode is 1 to 40 wt % based on a total amount of the polymer binder. 
     
     
         16 . The method of  claim 12 , wherein the solid electrolyte is a sulfide-based solid electrolyte.