Patent ID: 9672951
Date: 2017-06-06
CPC Classifications: C01B,H01B,H01M,Y02E

Claim:
1. A method for preparing a graphene-based LiFePO 4 /C composite material, comprising: dissolving a graphene oxide and an iron salt in a deionized water, a mass ratio of the graphene oxide over an iron element in the iron salt being 0.1:1 to 0.3:1; dispersing the graphene oxide by ultrasonic to obtain an iron salt solution having the graphene oxide dispersed therein; mixing the iron salt solution with a phosphate solution to obtain a reaction mixture, in which a molar ratio of Fe:P is 1:1 to 1:1.2; adjusting a pH value of the reaction mixture to 2 to 4; controlling a temperature of the reaction mixture to allow the reaction mixture to react at 60° C. to 80° C. to obtain an emulsion; filtering the emulsion to obtain a ferric phosphate/graphene oxide precursor; blending the ferric phosphate/graphene oxide precursor with a lithium salt at a Li:Fe molar ratio of 1:1 to 1.05:1 to form a first mixture; adding a carbon source to the first mixture to form a second mixture; and sintering the second mixture under a reducing atmosphere condition at 600° C. to 700° C., to obtain the graphene-based LiFePO