Universal preparation method for synthesizing carbon-coated nickel metal compound with various morphologies
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A metal compound and carbon-coated technology, which is applied in the application field of anode materials for sodium-ion batteries, can solve problems such as lengthy operation steps, material waste, and low conversion efficiency, and achieve abundant raw material reserves, good rate performance, and high specific capacity. Effect
Inactive Publication Date: 2020-12-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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Traditional synthesis methods often require lengthy operation steps. With the help of additional carbon materials (such as graphene, carbon nanotubes, and mesoporous carbon), it is easy to cause waste of materials and low conversion efficiency. Therefore, an efficient, environmentally friendly and versatile synthetic carbon has been developed. Composite metal compound approach has significant implications for improving energy storage of materials
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Embodiment 1
[0015] (1) Dissolving benzenetricarboxylic acid (0.15g), nickel nitrate hexahydrate (0.432g) and polyvinylpyrrolidone (1.033g) into the mixed solvent according to a certain quantitative ratio (V N，N-二甲基甲酰胺 :V 蒸馏水 =1:1), mixed evenly, transferred to a hydrothermal kettle, reacted in a thermostat at 160°C for 6 hours, cooled, washed and dried to obtain Ni-MOFs solid spheres.
[0016] (2) Put the Ni-MOFs spheres obtained in step (1) into a tube furnace, pass in an inert gas, and calcinate at 500 °C for 2 h to obtain a black powder, which is a carbon-coated NiO solid sphere (NiO@ C).
Embodiment 2
[0018] (1) Dissolving benzenetricarboxylic acid (0.15g), nickel nitrate hexahydrate (0.432g) and polyvinylpyrrolidone (1.033g) into the mixed solvent according to a certain quantitative ratio (V N，N-二甲基甲酰胺 :V 蒸馏水 =1:1), mixed evenly, transferred to a hydrothermal kettle, reacted in a thermostat at 160°C for 12 hours, cooled, washed and dried to obtain Ni-MOFs core-shell spheres.
[0019] (2) Place the Ni-MOFs spheres obtained in step (1) into a tube furnace, pass in an inert gas, and calcinate at 500°C for 2 hours to obtain a black powder, which is a carbon-coated NiO core-shell sphere (NiO @C).
Embodiment 3
[0021] (1) Dissolving benzenetricarboxylic acid (0.15g), nickel nitrate hexahydrate (0.432g) and polyvinylpyrrolidone (1.033g) into the mixed solvent according to a certain quantitative ratio (V N，N-二甲基甲酰胺 :V 蒸馏水 =1:1), mixed evenly, transferred to a hydrothermal kettle, reacted in a thermostat at 160°C for 20h, cooled, washed and dried to obtain Ni-MOFs hollow spheres.
[0022] (2) Put the Ni-MOFs spheres obtained in step (1) into a tube furnace, pass in an inert gas, and calcinate at 500 °C for 2 h to obtain a black powder, which is a carbon-coated NiO hollow sphere (NiO@ C).
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Abstract
The invention relates to a universal preparation method for synthesizing a carbon-coated nickel metal compound with various morphologies as a sodium ion battery negative electrode material by utilizing a metal organic framework design. The method comprises the following steps: dissolving an organic ligand, a nickel source and a surface dispersant into a mixed solvent according to a certain ratio,and controlling hydrothermal reaction time to generate nickel-containing metal organic frameworks with different morphologies (solid spheres, core-shell spheres and hollow spheres); the carbon-coatednickel-containing compounds (nickel oxide, nickel phosphide, nickel sulfide, nickel selenide and nickel telluride) with the shape similar to that of a template are synthesized by taking the frameworksas the template and adjusting an anionic ligand and utilizing an ion exchange strategy. The preparation method has the advantages that the morphology is adjustable; the components are rich; conditions are easy to control; the operation is simple; the conversion efficiency is high; the synthesis method has universality and can be expanded to synthesis of other types of carbon-coated metal compounds; and the product has high specific capacity and good rate capability.
Description
technical field [0001] The present invention belongs to the development of a general method to synthesize carbon-coated nickel-containing metal compounds (nickel oxide, nickel phosphide, nickel sulfide, selenide) with different shapes (solid sphere, core-shell sphere, hollow sphere). Nickel, nickel telluride) are applied as the technical field of sodium-ion battery negative electrode materials, specifically, by controlling the reaction temperature and time, using different ionization reactions to synthesize carbon-coated nickel-containing metal compounds of various shapes as Application of anode materials for sodium ion batteries. Background technique [0002] Compared with traditional graphite materials (<37mAh g -1 ), transition metal compounds (metal oxides, phosphides, sulfides and selenides) have been widely valued as new electrode materials with high theoretical capacity and low reduction potential. However, these compounds have poor electrical conductivity, slow ...
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