Spherical negative electrode composite material Si@MXene with core-shell structure and preparation method of spherical negative electrode composite material Si@MXene

The invention discloses a spherical negative electrode composite material Si@MXene with a core-shell structure and a preparation method of the spherical negative electrode composite material Si@MXene.The spherical negative electrode composite material Si@MXene is of a core-shell structure with the particle size of 150-200 nm, and Si nanoparticles are uniformly distributed in a shell formed by MXene. The preparation method disclosed by the invention comprises the following steps: firstly, preparing Si/PMMA to enable Si nanoparticles to be uniformly embedded into the PMMA; then attracting MXene through hydroxyl on the surface of the PMMA to coat the surface of the PMMA to form Si/PMMA@MXene, and finally removing the PMMA through heat treatment, so that Si nanoparticles are uniformly loadedon the MXene, thereby successfully obtaining the negative electrode composite material Si@MXene disclosed by the invention. A lithium ion battery assembled by the positive electrode prepared from theSi@MXene is high in specifi