| abstract |
The invention discloses a kind of composite ferric lithium phosphate material, the composite material is the composite material of LiFePO4 and 3D graphenes, and 3D graphenes content is 6 10wt% in the composite material, and carbon content is 7 7.5wt%.The 3D graphenes are intertwined the three-dimensional porous structure of combination formation for two-dimensional sheet graphene, and aperture is 5 40 μm.The preparation method of above-mentioned composite ferric lithium phosphate material is additionally provided in the present invention and using lithium ion battery of the composite ferric lithium phosphate material as positive electrode.The present invention has the characteristics that specific surface area, mechanical strength and the faster proton of bigger and electron transport rate using 3D porous graphenes compared with 2D graphenes, using 3D graphenes as a kind of carbon encapsulated material, effectively improve the electronic conductivity of LiFePO 4 material, when being applied as positive electrode in lithium ion battery, the diffusion rate of lithium ion is improved, that is, improves the cycle performance of lithium ion battery. |