Summary:

The invention discloses a sulfur composite cathode material and its preparation method and application, the preparation method comprises: mixing a metal sulfur-carbon polymer with conductive carbon and ball grinding it evenly to obtain a powder mixture; The powder mixture and the coating precursor were added to the organic solvent and stirred evenly to obtain the dispersion. In an anhydrous environment, the organic solvent in the dispersion is removed and heated, so that the precursor undergoes a liquid-phase in-situ reaction on the surface of the metal sulfur-carbon polymer and conductive carbon to form a coating layer, and the cathode material powder with a coating layer is obtained. The cathode material powder is mixed with the solid electrolyte powder and ground evenly to obtain a sulfur composite cathode material. The invention coats a coating layer capable of conducting metal ions on the surface of the metal sulfur-carbon polymer and conductive carbon by the liquid phase coating method, effectively reduces the interfacial impedance, improves the rate performance of the battery, and simultaneously, alleviates the collapse of the interface structure and maintains the stability of the electrode structure.

Link: http://epub.cnipa.gov.cn/patent/CN110350158A