The invention discloses a
lithium-
sulfur battery
cathode material and a preparation method thereof. The
cathode material is formed by in-situ
compositing of a mesoporous
metal-organic framework and elemental
sulfur. The mesoporous
metal-organic frame is of a laminated pore structure consisting of a
macro pore, a meso pore and a micro pore, wherein the pores are communicated with one another. The structure can adsorb more elemental
sulfur and can simultaneously inhibit the
dissolution of sulfur elementary substance and multi-sulfur compounds in
electrolyte, so that the cycle performance of a
lithium-sulfur battery is improved and high
utilization rate of an active substance of the
cathode material is kept. A sulfur and
metal-organic framework material
composite cathode material is prepared by a two-step process of low-temperature
liquid phase composition and sulfur extraction, a
composite material precursor with homogeneously dispersed
high load sulfur content can be obtained through in-situ
compositing at a low temperature with a liquid-phase preparation method, redundant sulfur on the surface of the precursor and in pore passages is extracted by an
organic solvent, the aperture of the
composite material can be further effectively adjusted and controlled,
selective distribution of sulfur is realized, and the
composite material with excellent electrochemical performance is obtained. By adopting the preparation method, the distribution of the sulfur in the composite material can be effectively improved, and the electrochemical performance of the composite material is optimized. Meanwhile, the preparation method is simple and is easy to perform industrially, and
mass production is facilitated.