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Nitrogen-doped hollow carbon sphere composite and preparation method and application thereof

A technology of composite materials and hollow carbon spheres, applied in active material electrodes, electrical components, electrochemical generators, etc., can solve the problem of low capacitance, achieve low cost, simple polymerization method, and promote development

Inactive Publication Date: 2018-08-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the fact that the current traditional carbon-based negative electrode materials have low theoretical capacitance and are difficult to meet the needs of the people, the primary purpose of the present invention is to provide a method for preparing a nitrogen-doped hollow carbon sphere composite material

Method used

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  • Nitrogen-doped hollow carbon sphere composite and preparation method and application thereof
  • Nitrogen-doped hollow carbon sphere composite and preparation method and application thereof
  • Nitrogen-doped hollow carbon sphere composite and preparation method and application thereof

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Effect test

Embodiment 1

[0038] (1) Dissolve 1 mmol of manganese acetate and 10 mmol of ammonium bicarbonate in 30 mL of ethylene glycol solution, perform hydrothermal reaction at 180° C. for 12 h, cool to normal temperature, then centrifuge, wash, and dry to obtain manganese carbonate microspheres.

[0039] (2) 100 mg of manganese carbonate microspheres and 100 mg of dopamine hydrochloride were dissolved in a Tris buffer solution with pH ≈ 8.5, reacted at room temperature, and then the reaction product was separated from solid to liquid, washed and dried to obtain a manganese carbonate / polydopamine complex.

[0040] (3) Under the protection of nitrogen, the manganese carbonate / polydopamine composite was calcined at 700°C for 5h, then cooled to 500°C, and the reaction was continued for 2h to obtain nitrogen-doped carbon-coated manganese oxide particles.

[0041] (4) Nitrogen-doped carbon-coated manganese oxide particles were treated with 0.5 mol / L sulfuric acid for 24 hours, centrifuged with absolute e...

Embodiment 2

[0046] (1) Dissolve 1mmol of manganese acetate and 12mmol of ammonium bicarbonate in 30mL of ethylene glycol solution, perform hydrothermal reaction at 200°C for 24h, cool to normal temperature, then centrifuge, wash and dry to obtain manganese carbonate microspheres.

[0047] (2) 100 mg of manganese carbonate microspheres and 300 mg of dopamine hydrochloride were dissolved in a Tris buffer solution with pH ≈ 8.5, reacted at room temperature, and then the reaction product was separated from solid to liquid, washed and dried to obtain a manganese carbonate / polydopamine complex.

[0048] (3) Under the protection of nitrogen, the manganese carbonate / polydopamine composite was calcined at 800°C for 8h, then cooled to 400°C, and the reaction was continued for 3h to obtain nitrogen-doped carbon-coated manganese oxide particles.

[0049] (4) Nitrogen-doped carbon-coated manganese oxide particles were treated with 0.1 mol / L hydrochloric acid for 24 hours, centrifuged with absolute etha...

Embodiment 3

[0052] (1) Dissolve 1mmol of manganese acetate and 8mmol of ammonium bicarbonate in 30mL of ethylene glycol solution, perform hydrothermal reaction at 220°C for 12h, cool to room temperature, then centrifuge, wash and dry to obtain manganese carbonate microspheres.

[0053] (2) 100 mg of manganese carbonate microspheres and 200 mg of dopamine hydrochloride were dissolved in a Tris buffer solution with pH ≈ 8.5, reacted at room temperature, and then the reaction product was separated from solid to liquid, washed and dried to obtain a manganese carbonate / polydopamine complex.

[0054] (3) Under the protection of nitrogen, the manganese carbonate / polydopamine composite was calcined at 700°C for 6h, then cooled to 500°C, and the reaction was continued for 3h to obtain nitrogen-doped carbon-coated manganese oxide particles.

[0055] (4) Nitrogen-doped carbon-coated manganese oxide particles were treated with 1mol / L oxalic acid for 48 hours, centrifuged with absolute ethanol, and dri...

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Abstract

The invention belongs to the field of lithium-ion battery materials and discloses a nitrogen-doped hollow carbon sphere composite and a preparation method and application thereof. Manganese acetate and ammonium bicarbonate are dissolved in ethylene glycol, solvothermal reaction is carried out at 180-220 DEG C to obtain manganese carbonate; the manganese carbonate is subjected to reaction with dopamine hydrochloride to obtain manganese carbonate / polydopamine composite; the manganese carbonate / polydopamine composite is calcined in an inert atmosphere to obtain nitrogen-doped carbon-coated manganese oxide composite; the nitrogen-doped carbon-coated manganese oxide composite is treated with an acid solution; washing and drying are performed to obtain the nitrogen-doped hollow carbon sphere composite. The preparation method herein is simple, low in cost and environmentally friendly. The prepared nitrogen-doped hollow carbon sphere composite has stable structure and good conductivity and hasexcellent cycle stability when acting as a lithium-ion battery anode material.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a nitrogen-doped hollow carbon sphere composite material and a preparation method and application thereof. Background technique [0002] The three major themes of science and technology development in the 21st century are energy, environment and information, among which the lack of energy and serious environmental pollution have become two major problems that need to be solved urgently. Energy and the environment are important foundations for human survival and development, and are closely related to the sustainable development of human society. The contradiction between the primary energy-based energy development and utilization model and the ecological environment is increasing day by day. A series of energy and environmental problems such as the gradual depletion of fossil energy and the increasingly serious environmental pollution are seriously threate...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/0525
CPCH01M4/366H01M4/50H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 蒋仲杰秦艳敏
Owner SOUTH CHINA UNIV OF TECH
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