Self-supporting spinning sulfur positive electrode host material rich in edge boron doping sites as well as preparation method and application of self-supporting spinning sulfur positive electrode host material

The invention belongs to the technical field of lithium-sulfur batteries, and particularly discloses a self-supporting spinning sulfur positive electrode host material rich in edge boron doping sites as well as a preparation method and application of the self-supporting spinning sulfur positive electrode host material. Boron (B) doped carbon quantum dots (CDs) are used as heteroatom introduction primitives to construct self-supporting carbon nanofibers (BCDs (at) CNF) rich in edge heteroatom doping sites, and the obtained sulfur positive electrode host material has the following advantages that (1) the rich edge heteroatoms have higher catalytic performance and can efficiently accelerate conversion of polysulfide, so that the cycling stability of LSBs is improved; (2) the host material does not contain a metal-based catalyst, has the characteristic of light weight, and can guarantee the sulfur content in the positive electrode; (3) the material is easy to infiltrate and suitable for the conditions of ultrahig