Electrodes including polyacrylate binders and methods of making and using the same

Abstract

Provided is an electrode composition comprising a powdered material capable of undergoing lithiation and delithiation, and a non-elastomeric binder comprising lithium polyacrylate, along with methods of making and using the same, as well as electrochemical cells incorporating the same.

1 . An electrode composition comprising:
 a powdered active material capable of undergoing lithiation and delithiation; and   a non-elastomeric binder comprising lithium polyacrylate,   
       wherein the powdered active material comprises a lithium metal oxide comprising at least one of cobalt, manganese, and nickel. 
     
     
         2 . An electrode composition according to  claim 1 , wherein the lithium metal oxide comprises cobalt, manganese and nickel. 
     
     
         3 . An electrode composition according to  claim 1 , wherein the amount of lithium polyacrylate is 5 or more weight percent of the weight of the total composition. 
     
     
         4 . An electrode composition according to  claim 1 , wherein the powdered material further comprises iron, titanium, or vanadium. 
     
     
         5 . An electrode composition according to  claim 1 , wherein the powdered material comprises lithium cobalt oxide. 
     
     
         6 . An electrochemical cell comprising:
 a positive electrode;   a negative electrode; and   an electrolyte,   
       wherein the positive electrode comprises a non-elastomeric binder comprising lithium polyacrylate, and 
       wherein the powdered active material comprises a lithium metal oxide comprising at least one of cobalt, manganese, and nickel. 
     
     
         7 . An electrochemical cell according to  claim 6 , wherein powdered active material comprises a lithium metal oxide comprising at least one of cobalt, manganese, and nickel. 
     
     
         8 . An electrochemical cell according to  claim 6 , wherein the amount of lithium polyacrylate in the non-elastomeric binder is 5 or more weight percent of the weight of the total composition. 
     
     
         9 . An electrochemical cell according to  claim 6 , wherein the powdered active material further comprises a material selected from iron, titanium, vanadium, and combinations thereof. 
     
     
         10 . An electrochemical cell according to  claim 6 , wherein the cell further comprises a secondary electrochemical cell. 
     
     
         11 . An electrochemical cell according to  claim 6 , wherein the negative electrode comprises a silicon alloy. 
     
     
         12 . An electrochemical cell according to  claim 6 , wherein the alloy further comprises iron, titanium, or vanadium. 
     
     
         13 . An electrochemical cell according to  claim 6 , wherein the negative electrode comprises graphitic carbon. 
     
     
         14 . A battery pack comprising at least electrochemical cell according to  claim 6 . 
     
     
         15 . A method of making an electrochemical cell electrode comprising:
 providing a current collector;   providing a powdered active material capable of undergoing lithiation and delithiation; and   applying to the current collector a coating that comprises the powdered active material and lithium polyacrylate,   
       wherein the powdered active material comprises a lithium metal oxide comprising at least one of cobalt, manganese, and nickel. 
     
     
         16 . A method of making an electrochemical cell electrode according to  claim 15 , wherein powdered active material comprises a lithium metal oxide comprising at least one of cobalt, manganese, and nickel. 
     
     
         17 . A method of making an electrochemical cell electrode according to  claim 15 , wherein the amount of lithium polyacrylate in the non-elastomeric binder is 5 or more weight percent of the weight of the total composition. 
     
     
         18 . A method of making an electrochemical cell electrode according to  claim 15 , wherein the powdered active material further comprises a material selected from iron, titanium, vanadium, and combinations thereof 
     
     
         19 . A method of making an electrochemical cell electrode according to  claim 15 , wherein applying the coating further comprises:
 mixing the powdered material with a solution of lithium polyacrylate to form a dispersion;   milling the dispersion to form a coatable mixture;   coating the mixture onto the current collector; and   drying the coated current collector.