2results about How to "Meet fast charging needs" patented technology

The present application relates to a new type of negative electrode material for lithium ion batteries, and particularly relates to a boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material and a preparation method thereof. The boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material is prepared by mixing a resin with a template agent, doping a boron source, adding a spheroidizing agent and an initiator for spheroidization polymerization, removing impurities and drying, and then performing gas-phase etching to form pores. Silicon is deposited in the pores of the porous carbon and a carbon layer is deposited on the surface of the silicon-carbon precursor by twice chemical vapor deposition, so as to obtain the boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material. The boron element is doped to optimize the electronic conductivity, the spheroidized porous carbon structure is improved to improve the lithium ion transmission channel and enhance the substrate stiffness, and the material has excellent performance of high rate, low expansion and long cycle, so as to solve the problems of insufficient rate performance, low substrate strength and blocked lithium ion transmission of the existing gas-phase silicon-carbon composite negative electrode material in the prior art.