Method for improving charge-discharge cycling capability through doping nano aluminum oxide and application

The invention discloses a method for improving the charge-discharge cycling capability through doping nano aluminum oxide and an application, and relates to the field of preparation of positive composite materials for lithium-sulfur batteries. Elemental sulfur and nano aluminum oxide are mixed evenly; and the nano aluminum oxide coats the surface of the elemental sulfur to form a stable composite material. The selected elemental sulfur is mixed with the nano aluminum oxide at a certain ratio; and then ball-milling and melting diffusion are carried out to obtain the sulfur/nano aluminum oxide composite material. By the method, the sulfur/nano aluminum oxide composite material with excellent electrochemical properties can be prepared; the synthesis method is simple; the energy consumption is low; the controllability is good; the yield is high; the cost is low; and the method is suitable for massive production. The invention further discloses the application of the sulfur/nano aluminum oxide composite material.