Electrode materials with high surface conductivity

Abstract

The present invention concerns electrode materials capable of redox reactions by electron and alkali-ion exchange with an electrolyte. The applications are in the field of primary (batteries) or secondary electrochemical generators, supercapacitors and light modulating systems of the electrochromic type.

1 - 38 . (canceled) 
     
     
         39 . A lithium ion battery comprising:
 an anode;   an electrolyte; and   a cathode, wherein the cathode comprises a particle of lithium iron phosphate (LiFePO 4 ) uniformly coated with a solid polymer comprising from 60% to 100% molar carbon and the solid polymer having an electronic conductivity higher than 10 −6  S/cm at room temperature.   
     
     
         40 . The lithium ion battery of  claim 39 , wherein the solid polymer is homogenous. 
     
     
         41 . The lithium ion battery of  claim 39 , wherein the solid polymer has an electronic conductivity higher than 10 −4  S/cm at room temperature. 
     
     
         42 . The lithium ion battery of  claim 39 , wherein the solid polymer further comprises hydrogen (H), nitrogen (N), or oxygen (O). 
     
     
         43 . The lithium ion battery of  claim 39 , wherein the cathode further comprises carbon black or carbon fibers and a current collector. 
     
     
         44 . The lithium ion battery of  claim 39 , wherein the electrolyte comprises a lithium salt and a polar liquid. 
     
     
         45 . The lithium ion battery of  claim 39 , wherein the particle of LiFePO 4  coated with a solid polymer exhibits a capacity between 94% and 100% of the theoretical capacity of LiFePO 4 . 
     
     
         46 . The lithium ion battery of  claim 39 , wherein the particle of LiFePO 4  coated with a solid polymer exhibits at least 70% of the theoretical capacity of LiFePO 4  after 1000 cycles at C/1.