Silicon-carbon negative electrode material and preparation method thereof

Abstract

The application discloses a kind of silicon-carbon negative electrode material and preparation method thereof, belong to negative electrode material technical field.The silicon-carbon negative electrode material includes: N-doped porous carbon, using polyimide-polyurethane-phenolic resin copolymer is obtained by carbonization;Nano silicon particles are loaded in the pore and / or surface of N-doped porous carbon;Amorphous carbon coating is coated on the surface of N-doped porous carbon and / or silicon nanoparticles.The application uses polyimide-polyurethane-phenolic resin by copolymerization strategy, polyimide segment, polyurethane segment and phenolic resin segment are copolymerized into molecular main chain, realize the uniform distribution of rigid segment (phenolic, polyimide) and flexible segment (polyurethane) at molecular level, and the introduction of polyurethane can solve the phase separation problem of phenolic, polyimide in prior art, ensure that the N-doped porous carbon pore obtained after carbonization is uniform, and the mechanical properties of carbon skeleton are consistent.

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