A preparation method of a metal-organic frame carbon nanotube composite material

Abstract

The invention provides a preparation method of a metal-organic framework carbon nanotube composite material, comprising the following steps: step 1) weighing pyromellitic acid and ceric ammonium nitrate with a molar ratio of 1: 1, adding the mixed solvent of organic solvent N, N-dimethylformamide and water is mixed to obtain a mixed solution, and the ratio of the mixed solution to the dimethylformamide is 5: 1; 2) place that mixed solution in an oil bath pot with the temperature of 80 to 120 DEG C for reaction for 30 minute to obtain grey powder; 3) that gray powder is respectively prepared byuse N, N-Dimethylformamide, and anhydrous methanol; 4) drying after the step 3), obtain nanometer metal organic frame-carbon nanotube composite material after drying. That metal organic frame-carbonnanotube composite material coating separator prepare by the invention is applied in a lithium sulfur battery, and the generation of the shuttle effect is effectively restrained, thereby improving thecycle stability of the battery and the specific capacity of the battery.

Description

technical field [0001] The invention belongs to the technical field of metal-organic framework carbon nanotube composite material preparation, and in particular relates to a preparation method of a metal-organic framework carbon nanotube composite material and a preparation method of a coating diaphragm based on the metal organic framework carbon nanotube composite material. Background technique [0002] At present, commercialized lithium-ion batteries have been dominating the secondary battery due to their relatively high energy density (usually 150-200 Wh / Kg), excellent cycle performance, high operating voltage (3.8 V) and no memory effect. secondary battery market. However, since lithium-ion batteries have always been limited by the theoretical specific energy of positive electrode materials, it is difficult to break through 300 Wh / Kg, and it is difficult to meet the current emerging market demand for high specific energy density secondary battery applications. For mil...

AI Technical Summary

Problems solved by technology

However, during the charge and discharge process of lithium-sulfur batteries, lithium polysulfide, the reaction intermediate of sulfur, which is the active material of the positive electrode of the battery, is easily dissolved in the electrolyte, which makes lithium polysulfide shuttle to the lithium metal negative electrode, and the shuttle effect occurs, so that the capacity of the lithium-sulfur battery Rapid decay with battery charge and discharge cycles

At present, for the dissolution of lithium polysulfide, porous carbon and porous metal oxides are often used to load elemental sulfur as the positive electrode of lithium-sulfur batteries to limit the dissolution of lithium polysulfide.

However, this method introduces a large amount of inactive materials, which reduces the overall energy density of the battery.

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