The invention discloses a
lithium-
sulfur battery
cathode material, a preparation method, and a
lithium-
sulfur battery, and belongs to the technical field of
lithium-
sulfur battery materials. The lithium-sulfur battery
cathode material is a carbon-sulfur
composite material, which is coated by a carbon cladding layer with a micro-porous structure. In the preparation method, under a vacuum condition, the raw materials are heated, just in one step, the sulfur and the
carbon matrix are uniformly combined, the carbon precursor is carbonized, and the
coating on the carbon-sulfur
composite material is achieved. Compared with the conventional low-temperature
coating method, the carbon cladding layer, which is carbonized at a high temperature and has a micro-porous structure, can form interactions just like the chemical bonds with the carbon-sulfur
composite material; so that the micro-
porous carbon cladding layer and the carbon-sulfur composite material are tightly combined together, thus the sulfur and
discharge products cannot be easily dissolved in the
electrolyte, the shuttling effect is prevented, the
utilization rate of sulfur is improved, at the same time, the
conductivity of the
cathode material is better improved, and the cycle stability and capacity
retention rate of the lithium-sulfur battery are both improved.