Electrode mixture, battery, and method for producing electrode

Abstract

An electrode mixture includes a sulfide solid electrolyte and a carbon-containing material having contact with the sulfide solid electrolyte. An intensity ratio C/S determined from a spectrum obtained by analyzing the electrode mixture by Auger electron spectroscopy satisfies 0.2≤C/S≤1, where C is an intensity of a peak in the spectrum which corresponds to carbon included in the carbon-containing material, and S is an intensity of a peak in the spectrum which corresponds to sulfur included in the sulfide solid electrolyte.

What is claimed is: 
     
         1 . An electrode mixture comprising:
 a sulfide solid electrolyte; and   a carbon-containing material having contact with the sulfide solid electrolyte,   wherein an intensity ratio C/S determined from a spectrum obtained by analyzing the electrode mixture by Auger electron spectroscopy satisfies 0.2≤C/S≤1, where C is an intensity of a first peak in the spectrum, the first peak corresponding to carbon included in the carbon-containing material, and S is an intensity of a second peak in the spectrum, the second peak corresponding to sulfur included in the sulfide solid electrolyte.   
     
     
         2 . The electrode mixture according to  claim 1 ,
 wherein the carbon-containing material is a binder.   
     
     
         3 . A battery comprising the electrode mixture according to  claim 1 . 
     
     
         4 . A battery comprising the electrode mixture according to  claim 2 . 
     
     
         5 . The battery according to  claim 3 ,
 wherein the battery further comprises a positive electrode; and   wherein the positive electrode includes the electrode mixture.   
     
     
         6 . The battery according to  claim 4 ,
 wherein the battery further comprises a positive electrode; and   wherein the positive electrode includes the electrode mixture.   
     
     
         7 . A method for producing an electrode, the method comprising:
 preparing a slurry including a sulfide solid electrolyte, an electrode active material, a carbon-containing material, and a solvent;   applying the slurry to a current collector to form a coating film on the current collector; and   removing the solvent from the coating film to form an electrode mixture layer,   wherein an intensity ratio C/S determined from a spectrum obtained by analyzing the electrode mixture layer by Auger electron spectroscopy satisfies 0.2≤C/S≤1, where C is an intensity of a first peak in the spectrum, the first peak corresponding to carbon included in the carbon-containing material, and S is an intensity of a second peak in the spectrum, the second peak corresponding to sulfur included in the sulfide solid electrolyte.   
     
     
         8 . The method for producing an electrode according to  claim 7 ,
 wherein the slurry is prepared by   stirring a first mixture including the sulfide solid electrolyte, the carbon-containing material, and the solvent,   adding the electrode active material to the first mixture to prepare a second mixture, and   stirring the second mixture.