A kind of preparation method of high energy density lithium-sulfur battery cathode material

Abstract

The invention discloses a preparation method of a high-energy density lithium-sulfur battery positive electrode material, and belongs to the technical field of the preparation of lithium-sulfur battery positive electrode materials. The preparation method comprises the following steps: reacting hydrochloric acid with sodium thiosulfate to prepare nanometer sulfur, coating the nanometer sulfur with silica to prepare microspheres, loading the prepared microspheres to a polyurethane foam material, plating copper to prepare a foam copper material, melting internal nanometer sulfur single substance in the calcining process of the foam copper and sublimation sulfur to fill internal foam copper pores, and calcining the filled foam copper material and external sublimation sulfur to generate penetration. The high-energy density lithium-sulfur battery positive electrode material has the advantages of effectively enhanced elemental sulfur load, improvement of the energy density of lithium-sulfur batteries, ,excellent stability, excellent cycle life, rapid activation in the cycle process, and effective improvement of the cycle and rate performances of the batteries.

Description

technical field [0001] The invention discloses a preparation method of a high-energy-density lithium-sulfur battery cathode material, and belongs to the technical field of lithium-sulfur battery cathode material preparation. Background technique [0002] Compared with traditional commercial power sources such as nickel-chromium batteries and nickel-metal hydride batteries, lithium-ion batteries meet the requirements of the rapid development of current electronic technology. They have the advantages of high working voltage, long cycle life, and environmental protection and pollution-free. . However, with the rapid development of mobile electronic devices and new energy vehicles, the requirements for specific energy and specific power of energy storage devices are getting higher and higher. However, currently commercial lithium-ion battery cathode materials such as lithium iron phosphate, lithium manganese oxide, lithium nickel oxide, lithium cobalt oxide and other materials ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: In the positive electrode of the existing lithium-sulfur battery, the loading capacity of elemental sulfur is modified through pore binding, coating or adsorption, etc., resulting in low energy density of the lithium-sulfur battery and poor practical performance. For poorer problems, it provides a method of preparing modified microspheres with nanometer elemental sulfur, filling them inside the lithium-sulfur battery, combining them with the sulfur loaded in the external pores, and forming a lithium-sulfur battery cathode material with a high loading rate through calcination. The method, the present invention prepares nano-sulfur by reacting hydrochloric acid and sodium thiosulfate, coats nano-sulfur with silicon dioxide and prepares microspheres, loads the prepared microspheres into polyurethane foam materials, and then prepares copper foam materials by copper plating. During the calcination process of foamed copper and sublimated sulfur, the internal nano-sulfur element is melted to fill the internal copper foam pores, and the external sublimated sulfur is calcined to form a connection at the same time, which effectively enhances the elemental sulfur load and improves the energy density of lithium-sulfur batteries. It has broad application prospects.