Electrode Composite Material, Preparation Method Thereof, Cathode And Battery Including The Same

Abstract

An electrode composite material is disclosed in the invention. The electrode composite material comprises AB x C y D z , wherein A is selected from at least one of polypyrrole, polyacrylonitrile, and polyacrylonitrile copolymer; B comprises sulfur, C is selected from carbon material; D is selected from metal oxides, 1≤x≤20, 0≤y<1, and 0≤z<1. Comparing to the prior art, the conductivity of the electrode composite material is obviously increased, the material is dispersed uniformly and the size of the material is small. The electrochemical performance of the electrode composite material is improved. It has a good cycle life and high discharging capacity efficiency. A method for manufacturing the electrode composite material, a positive electrode using the electrode composite material and a battery including the same are also disclosed in the invention.

1 - 10 . (canceled) 
     
     
         11 . A method for preparing an electrode composite material comprising the following steps:
 dispersing sulfur in a first solvent to get a first solution;   adding at least one of polypyrrole, polyacrylonitrile, and polyacrylonitrile copolymer into a second solvent to obtain a second solution;   mixing the first solution, the second solution, and at least one metal oxide by ball milling in an inert atmosphere to obtain a mixture;   drying the mixture to remove the solvents from the mixture; and then   heat-treating the dried mixture in a protective gas; and   cooling the heat-treated mixture to obtain the electrode composite material;   wherein the first solvent is selected from one of carbon disulfide, toluene, and liquid hydrocarbon,   wherein the second solvent is selected from one of dimethylformamide, dimethyl acrylamide, a mixture of dimethyl acrylamide and lithium chloride, and dimethyl sulfoxide, and   wherein the heat-treating step is performed at a temperature of 150-450° C. for a duration of 1-20 h.   
     
     
         12 . The method for preparing an electrode composite material according to  claim 11 , wherein the metal oxide is Mg a Ni b O, wherein 0<a<1, 0<b<1 and a+b=1. 
     
     
         13 . The method for preparing an electrode composite material according to  claim 11 , wherein the metal oxide comprises a mixture of MgO and NiO, or a mixture of MgO and CuO. 
     
     
         14 . The method for preparing an electrode composite material according to  claim 11 , wherein the ball milling is performed at a rotation speed of 200-1300 rpm for a duration of 0.5-12 h. 
     
     
         15 . The method for preparing an electrode composite material according to  claim 11 , wherein the drying step is performed at a temperature of 35-75° C. for a duration of 3-12 h. 
     
     
         16 . The method for preparing an electrode composite material according to  claim 11 , wherein the protective gas is selected from one of Ar, N 2 , a reductive gas mixture of Ar and H 2 , and a reductive gas mixture of N 2  and H 2 . 
     
     
         17 . An electrode composite material prepared by method of  claim 11 , the electrode composite material comprising AB x C y D z , wherein A is selected from at least one of polypyrrole, polyacrylonitrile, and polyacrylonitrile copolymer, B is sulfur, C is a carbon based material, and D is a metal oxide; and wherein 1≤x≤20, 0≤y<1, and 0≤z<1. 
     
     
         18 . The electrode composite material according to  claim 17 , wherein y=0 and 0<z<1. 
     
     
         19 . The electrode composite material according to  claim 17 , wherein 0<y<1 and 0<z<1. 
     
     
         20 . The electrode composite material according to  claim 17 , wherein the polyacrylonitrile copolymer is selected from at least one of polyacrylonitrile methylmethacrylate copolymer, and polyacrylonitrile polypyrrole copolymer. 
     
     
         21 . The electrode composite material according to  claim 17 , wherein the carbon based material is selected from at least one of ketjen black, acetylene black, active carbon, single wall carbon nano-tube, multi wall carbon nano-tube, and graphene. 
     
     
         22 . The electrode composite material according to  claim 17 , wherein the metal oxide of D is selected from at least one of Mg a Ni b O, MgO, NiO, V 2 O 5 , CuO, Mg c Cu d O, La 2 O 3 , Zr 2 O 3 , Ce 2 O 3 , and Mn 2 O f , wherein 0<a<1, 0<b<1, a+b=1, 0<c<1, 0<d<1, and c+d=1, and wherein the value of f is 2 or 3 or 4 or 7. 
     
     
         23 . A cathode for a battery, comprising the electrode composite material according to  claim 17 . 
     
     
         24 . A battery, comprising a cathode, an anode and an electrolyte provided between the cathode and anode, the cathode comprising a cathode current collector and the electrode composite material according to  claim 17 . 
     
     
         25 . The battery according to  claim 24 , wherein the electrolyte is selected from one of polyvinylidene fluoride, polyvinylidene fluoride-poly(methyl methacrylate) copolymer, polyvinylidene fluoride-hexafluoropropylene copolymer, and polyethylene glycol boric acid ester polymers. 
     
     
         26 . The battery according to  claim 24 , wherein the cathode current collector is selected from one of aluminum foil, nickel foam, and stainless steel net.