▎ 摘　　要

NOVELTY - Single-atom electrocatalyst comprises 0.5-20 wt.% single atom and single atom carrier. The bonding method between the single atom carrier and the single atom, which includes oxygen bond, nitrogen bond and sulfur bond. The single atom includes zinc, cobalt, nickel, iron, manganese and indium. The single atom carrier includes graphene carbon, carbon shell, carbon black, carbon nanotube, and onion carbon. USE - Single-atom electrocatalyst used as positive electrode material in lithium-sulfur battery (claimed). ADVANTAGE - The single-atom electrocatalyst has greatly accelerate the catalytic conversion of the polysulfide, so as to inhibiting the shuttle effect and the utilization rate of the polysulfide, and finally obtaining the lithium-sulfur battery with high capacity, high multiplying power and long cycle, and is beneficial to the commercial application of the lithium-sulfur battery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1)a method for preparing single-atom electrocatalyst, which involves: (a)dissolving the metal salt into the aqueous solution to obtain salt solution;(b) mixing the obtained salt solution with the aqueous polymer solution;(c)heating;(d)stirring under a certain temperature condition to obtain a uniform mixed solution;(e)adding the obtained mixed solution into the monoatomic carrier;(f)stirring for a certain period of time;(g)freezing, drying for a certain period of time;(h)annealing to obtain a single-atom electrocatalyst; and (2) an application method of single-atom electrocatalyst positive electrode material is used as the positive electrode of the lithium-sulfur battery, and the composite positive electrode of sulfur and catalyst is realized by molten sulfur injection, which involves: (a)mixing the single-atom catalyst with a certain amount of sulfur powder;(b)heating for a certain period of time at a certain temperature and a certain atmosphere to obtain a composite product of the single-atom catalyst and sulfur;(c)grinding the obtained composite product of the single-atom catalyst and sulfur;(d)coating with slurry;(e)processing into pieces, and assembling to obtain a lithium-sulfur battery.