PREPARATION METHOD OF HOLLOW CARBON SPHERE AND CARBON SHELL-SULFUR COMPOSITE, HOLLOW CARBON SPHERE, AND CARBON SHELL-SULFUR COMPOSITE FOR SECONDARY LITHIUM SULFUR BATTERY

摘要

A preparation method of a hollow carbon sphere includes preparing a hollow carbon sphere including fine pores by using mold particles and a material including metal-phthalocyanine. The prepared hollow carbon sphere has a carbon shell surface including fine pores, and the hollow carbon sphere may be impregnated with sulfur to prepare a carbon shell-sulfur composite and may be utilized as an anode material of a lithium-sulfur secondary battery. The carbon-sulfur composite material may improve extremely low electrical conductivity of sulfur, confine sulfur and lithium polysulfide originated from sulfur in the carbon shell in which fine pores are distributed to prevent lithium polysulfide having an extended chain structure from being dissolved in an electrolyte, minimize a shuttle reaction, reduce an overcharge amount between charging and discharging, and improve performance of a secondary battery. In addition, a method for mass-producing hollow carbon sphere and carbon shell-sulfur composite material is provided.

主权项

1. A preparation method of a hollow carbon sphere, the method comprising the steps of:
(1) mixing mold particles and a material including metal-phthalocyanine to prepare a mixed material; (2) heat-treating the mixed material under the condition of an inert atmosphere to form a carbon shell-mold particle composite which is mold particle covered with a carbon layer including fine pores; and (3) removing the mold particles from the carbon shell-mold particle composite to obtain a hollow carbon sphere having carbon shell including fine pores and an internal space thereof.