Lithium secondary battery including water-dispersible binder, conduction agent, and fluoroethylenecarbonate

Abstract

The present invention relates to a lithium secondary battery. The present invention provides the lithium secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte solution. The negative electrode includes a water-dispersible binder and a conduction agent. The non-aqueous electrolyte solution includes fluoroethylenecarbonate (FEC). The batteries of the present invention are advantageous in that they have a high efficiency charging lifespan characteristic and enable high capacity charging in a short time.

What is claimed is: 
     
         1 . A lithium secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte solution, wherein
 the negative electrode comprises a negative electrode composition including a negative electrode active material, a water-dispersible binder and a conduction agent,   the water-dispersible binder is included in an amount of 1 wt % to 4 wt % based on a total amount of the negative electrode composition iimd Inc conduction agent is included in an amount of 0.2 wt % to 08 wt % based on a total amount of the negative electrode composition,   wherein the non-aqueous electrolyte solution comprises 10 wt % to 15 wt % of fluoroethylenecarbonate (FEC) based on a total amount of the non-aqueous electrolyte solution and 85 wt % to 90 wt % of ethylenecarbonate (EC) based on a total amount of the non-aqueous electrolyte solution,   wherein the conduction agent is one or more selected from acetylene black, carbon black, and graphite, and   wherein the water-dispersible binder is one or more selected from styrene-butadiene rubber, acrylonitrile-butadiene rubber, acrylonitrile-butadiene-styrene rubber, carboxymethyl cellulose, and hydroxypropylmethyl cellulose.   
     
     
         2 . The lithium secondary battery of  claim 1 , wherein the fluoroethylenecarbonate (FEC) is included in an amount of 10 wt % to 15 wt % based on a total amount of the non-aqueous electrolyte solution including the flmiroethylenecarbonate (FEC). 
     
     
         3 . The lithium secondary battery of  claim 2 , wherein ethylenecarbonate (EC) is included in an amount of 85 wt % to 90 wt % based on a total amount of the non-aqueous electrolyte solution including the ethylenecarbonate (EC). 
     
     
         4 . The lithium secondary battery of  claim 1 , wherein the conduction agent is one or a combination of two or more selected from acetylene black, carbon black, and graphite. 
     
     
         5 . The lithium secondary battery of  claim 1 , wherein the conduction agent is included in an amount of 0.2 wt % to 0.8 wt %. 
     
     
         6 . The lithium secondary battery of  claim 1 , wherein the water-dispersible binder is one or a combination of two or more selected from styrene-butadiene rubber, acrylonitrile-butadiene rubber, acrylonitrile-butadiene-styrene rubber, carboxymethyl cellulose, and hydroxypropylmethyl cellulose. 
     
     
         7 . The lithium secondary battery of  claim 1 , wherein the water-dispersible binder is included in an amount of 1 wt % to 4 wt % based on a total weight of an electrode composition. 
     
     
         8 . The lithium secondary battery of  claim 1 , wherein the negative electrode active material has a particle diameter of 5 to 30 μm.