Oxide nanowire-MOF derivative/S composite positive electrode material and preparation method therefor

Abstract

The invention discloses an oxide nanowire-MOF derivative / S composite positive electrode material and a preparation method therefor, and belongs to the fields of a lithium-sulfur battery positive electrode material and a preparation method therefor. According to the positive electrode material, the effects of PVP, SDS, PVA, NPAM and other surfactants are utilized; next, by taking metal oxide nanowires as the substrate, imidazole, an organic solvent and metal salt are added, and then, standing and hydrothermal and solvothermal methods are preformed to prepare an oxide nanowire / ZIF-system MOFs tomatoes-on-sticks-shaped composite material to be used as a precursor; and then the precursor is subjected to carbonization treatment, and next, sulfur fixation is carried out by the carbonized product so as to obtain the oxide nanowire-MOF derivative / S composite positive electrode material. The carbonized product has relatively large specific surface area and relatively high conductivity, so that the carbonized product is very suitable for sulfur fixation; and in addition, the composite positive electrode material and the preparation method therefor are relatively high in cycling stability and capacity, and have simple preparation and easily available raw materials, so that the advantages of accelerating commercialization of the lithium-sulfur battery and the like, as well as quite high potential value are achieved.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur battery positive electrode materials and preparation methods thereof, and specifically relates to an oxide nanowire-MOF derivative / S composite positive electrode material and a preparation method thereof. Background technique [0002] In recent years, lithium-sulfur batteries have attracted the attention of many researchers because of their excellent energy density and power density. As we all know, elemental sulfur has many excellent natural properties, such as relatively low price, abundant reserves, and environmental friendliness. However, sulfur has poor electrical conductivity and cannot be used alone as a positive electrode material, which restricts the development of lithium-sulfur batteries and makes it impossible for large-scale commercial use. In order to improve the cycle performance of lithium-sulfur batteries, we usually use conductive materials to coat sulfur to improve the conductivit...

AI Technical Summary

Problems solved by technology

[0005] In view of the existing lithium-sulfur batteries, when sulfur is used alone as a positive electrode material, the electrical conductivity is poor, the cycle performance is not stable, etc., the present invention provides an oxide nanowire-MOF derivative / S composite positive electrode material and The preparation method thereof belongs to the field of lithium-sulfur battery cathode materials and preparation methods thereof

The oxide nanowire-MOF derivative / S composite positive electrode material solves some problems such as poor conductivity when sulfur is used alone as the positive electrode of lithium-sulfur batteries. The carbonized product has a large specific surface area and high conductivity. Better, it is very suitable for sulfur fixation; in addition, the oxide nanowire-MOF derivative / S composite cathode material also has good cycle stability, relatively high capacity, simple preparation, and easy access to raw materials, which is beneficial to There are many advantages such as accelerating the commercialization of lithium-sulfur batteries, which have great potential value

Images