| abstract |
The invention relates to a preparation method of Fe-doped Si/C composite material for lithium ion battery negative electrode, and belongs to the technical field of lithium ion battery negative electrode material. The technical scheme of the present invention uses ZIF-8 as the substrate and adopts a new strategy based on "competitive coordination of framework metals" to realize the rapid doping of Zn and Fe; ZIF-8 undergoes high temperature pyrolysis above 900° C. Evaporation in the form of vapor forms nanopores, and the abundant pore structure can provide sufficient electrode/electrolyte interface, promote effective contact between electrolyte and Si nanoparticles, accelerate the penetration of electrolyte, and reduce the diffusion distance of lithium ions to improve lithium ions of storage. Compared with the prior art, the method of the present invention does not need to be treated with acid after calcination, which simplifies the operation, and the prepared negative electrode material can effectively improve the capacity exertion and cycle life of the material, improve the first efficiency, and improve the electrochemical performance. . |