A kind of synthesis method of nitrogen-doped molybdenum selenide, nitrogen-doped molybdenum selenide and its application

Abstract

The invention discloses a synthesis method of nitrogen-doped molybdenum selenide. The method comprises the following steps: (a) dissolving selenium powder in hydrazine hydrate to obtain a first solution, dissolving sodium molybdate, biomass template and GO powder in water to obtain a second solution and mixing the first solution with the second solution and performing hydrothermal reaction to obtain a third solution; and (b) centrifuging and drying the third solution to obtain molybdenum selenide power to be put into ammonia gas for annealing reaction and etching the calcined powder with HF soas to obtain the nitrogen-doped molybdenum selenide with a three-dimensional network structure. The nitrogen-doped molybdenum selenide has uniform element distribution and high nitrogen content and has the advantages of high energy density and good cycle stability when used in potassium ion energy storage devices. The three-dimensional network structure can well alleviate the volume expansion andN doping caused by the insertion and removal of potassium ions and can increase many active sites on the surface of the active material to enhance the potassium storage performance. Meanwhile, the composite with graphene can improve the electrical conductivity, the cycle stability and the mechanical stability of the active material.

Description

technical field [0001] The invention belongs to the field of alkali metal batteries, and in particular relates to a synthesis method of nitrogen-doped molybdenum selenide, nitrogen-doped molybdenum selenide and applications thereof. Background technique [0002] At present, lithium-ion batteries have occupied most of the energy storage market. Due to their high energy density and stable safety factor, they have been commercialized and are increasingly welcomed and developed by everyone. As we all know, lithium resources are quite scarce and unevenly distributed. It is predicted that by 2025, the consumption of metallic lithium will exceed 20% of its production. Therefore, it is particularly important to find an alternative alkaline metal battery. In the periodic table of elements, sodium and potassium are next to the same main group as metal lithium. Because sodium ions cannot store energy in graphite, which limits its commercial development, potassium ion energy storage sy...

AI Technical Summary

Problems solved by technology

However, the biggest problem at present is that the radius of potassium ions is too large, which can easily cause the surface of the material to collapse, so designing a new type of electrode material has become a top priority.

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