Nitrogen-doped porous carbon ball/manganic manganous oxide nanometer composite electrode material and preparation method thereof

A technology of trimanganese tetraoxide nanometer and nitrogen-doped porous carbon, which is applied in battery electrodes, nanotechnology, nanotechnology, etc., to achieve the effects of strong operability, less stringent equipment requirements, and excellent high-rate discharge performance

Inactive Publication Date: 2016-02-24
HUBEI ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, manganese tetraoxide nanoparticles, porous carbon materials and nitrogen doping are combined, and a method with strong operability and mild preparation conditions is used to load trimanganese tetraoxide nanoparticles on nitrogen-doped porous carbon spheres to prepare high Reports of high-performance nanocomposite electrode materials are still rare

Method used

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  • Nitrogen-doped porous carbon ball/manganic manganous oxide nanometer composite electrode material and preparation method thereof
  • Nitrogen-doped porous carbon ball/manganic manganous oxide nanometer composite electrode material and preparation method thereof
  • Nitrogen-doped porous carbon ball/manganic manganous oxide nanometer composite electrode material and preparation method thereof

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Experimental program
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Embodiment 1

[0030] After adding 0.36g of cetyltrimethylammonium bromide to 180ml of deionized water and absolute ethanol mixed solvent with a volume ratio of 1.9:1 to dissolve, continue to add 3ml of tetraethyl orthosilicate and 3ml of ammonia water (NH 3The mass percentage is 25~28%), stirring for 10h; dissolving carboxymethyl chitosan in deionized water and stirring for 10h to form 100ml of a solution with a mass percentage of 5%, and then mixing with the above solution for 24h; then evaporating the mixed solution solvent , and put it into a drying oven at 100°C for curing treatment for 20 hours. After the solid material was ground, it was carbonized under the protection of high-purity nitrogen. The carbonization temperature was 800°C, the carbonization time was 2 hours, and the heating rate was 5°C / min; The product was placed in a 10% hydrofluoric acid solution by mass and stirred for 24 hours, washed three times with deionized water, dried at 80°C to obtain nitrogen-doped porous carbon...

Embodiment 2

[0034] Add 0.32g of cetyltrimethylammonium bromide to 160ml of a mixed solvent of deionized water and absolute ethanol with a volume ratio of 2.0:1 to dissolve, then continue to add 2ml of ethyl orthosilicate and 2ml of ammonia water (NH 3 The mass percentage is 25~28%), stirring for 8h; dissolving carboxylated chitosan in deionized water and stirring for 8h to form 100ml of a solution with a mass percentage of 3%, and then mixing with the above solution for 18h; then evaporating the mixed solution solvent, And put it in a drying oven at 80°C for 18 hours, and then grind the solid material and carry out carbonization treatment under the protection of high-purity nitrogen. The carbonization temperature is 700°C, the carbonization time is 2h, and the heating rate is 5°C / min; The product was placed in an 8% hydrofluoric acid solution by mass and stirred for 18 h, washed twice with deionized water, and dried at 80°C to obtain nitrogen-doped porous carbon spheres.

[0035] Weigh 70...

Embodiment 3

[0038] After adding 0.4g of cetyltrimethylammonium bromide to 200ml of a mixed solvent of deionized water and absolute ethanol with a volume ratio of 2.2:1 to dissolve, continue to add 4ml of tetraethyl orthosilicate and 4ml of ammonia water (NH 3 The mass percentage is 25~28%), stirred for 8h; 600,000 molecular weight chitosan was dissolved in acetic acid aqueous solution with a volume concentration of 3% to form 120ml of a solution with a mass percentage of 2%, and then mixed with the above solution for 24h; then the The solvent of the mixed solution was evaporated, and put into a drying oven at 120°C for solidification treatment for 24 hours. After the solid material was ground, it was carbonized under the protection of high-purity nitrogen. The carbonization temperature was 850°C, the carbonization time was 3 hours, and the heating rate was 5°C / minutes; the carbonized product was placed in a 6% hydrofluoric acid solution and stirred for 24 hours, then washed three times wi...

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Abstract

The invention discloses a nitrogen-doped porous carbon ball/manganic manganous oxide nanometer composite electrode material and a preparation method thereof. The preparation method comprises that chitosan and its derivative as carbon source and nitrogen source predecessors and porous silica as a hard template are carbonized, then silica is removed so that nitrogen-doped porous carbon balls are obtained, manganic manganous oxide nanometer particles grow on the nitrogen-doped porous carbon balls by a mild solvothermal method, and the nitrogen-doped porous carbon balls with the manganic manganous oxide nanometer particles are subjected to centrifugation washing and drying so that the nitrogen-doped porous carbon ball/manganic manganous oxide nanometer composite electrode material is obtained. The prepared material as a lithium ion battery negative electrode material has a high reversible specific capacity, good cycling stability and excellent multiplying power discharge performances. The preparation method can be operated easily, has mild preparation conditions and no harsh requirement on equipment and is suitable for industrial production. The nitrogen-doped porous carbon ball/manganic manganous oxide nanometer composite electrode material has a wide application prospect in the electrochemistry fields of high performance lithium ion batteries and super capacitors.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic nano-composite materials, in particular to a nitrogen-doped porous carbon sphere / manganese tetraoxide nano-composite material and a preparation method thereof. Background technique [0002] At present, the graphite anode material used commercially in lithium-ion batteries not only has a low theoretical specific capacity (only 372mAh / g), but also has poor safety when charging and discharging at a high rate. These defects limit the use of lithium-ion batteries in pure electric vehicles (EVs). ), hybrid electric vehicles (HEV) and aerospace and other large-scale power supply fields. The lithium storage behavior of transition metal oxides is based on the conversion reaction mechanism and thus has a higher theoretical specific capacity than graphite, but the electronic conductivity of this type of material is generally low in practical applications, and there are serious problems in the repeated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/50H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/50H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 郭连贵覃彩芹李伟丁瑜王锋方衎孙双桥
Owner HUBEI ENG UNIV
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