Nitrogen-doped carbon-coated manganous-manganic oxide composite material, as well as preparation method and application thereof

A carbon-coated manganese tetroxide composite material and composite material technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve problems such as poor electrical conductivity and cycle stability, and achieve industrialized scale production, increase The effect of electrical conductivity and good stability

Inactive Publication Date: 2018-09-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current traditional manganese-based metal oxide lithium-ion battery anode materials still have disadvantages such as poor electrical conductivity and poor cycle stability.

Method used

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  • Nitrogen-doped carbon-coated manganous-manganic oxide composite material, as well as preparation method and application thereof
  • Nitrogen-doped carbon-coated manganous-manganic oxide composite material, as well as preparation method and application thereof
  • Nitrogen-doped carbon-coated manganous-manganic oxide composite material, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (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.

[0036] (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.

[0037] (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.

[0038] (4) Nitrogen-doped carbon-coated manganese oxide was oxidized in a muffle furnace at 280°C for 2 hours to obtain nitrogen-doped carbon-coated ...

Embodiment 2

[0043] (1) 1 mmol of manganese acetate and 8 mmol of ammonium bicarbonate were dissolved in 30 mL of ethylene glycol solution, and hydrothermal reaction was carried out at 200 ° C for 24 hours. After cooling to room temperature, centrifuged, washed, and dried to obtain manganese carbonate microspheres.

[0044] (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.

[0045] (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.

[0046] (4) Nitrogen-doped carbon-coated manganese oxide was oxidized in a muffle furnace at 260°C for 3 hours to obtain n...

Embodiment 3

[0049] (1) Dissolve 1mmol of manganese acetate and 12mmol 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.

[0050] (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.

[0051] (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 2h to obtain nitrogen-doped carbon-coated manganese oxide particles.

[0052] (4) Nitrogen-doped carbon-coated manganese oxide was oxidized in a muffle furnace at 300°C for 1 hour to obtain nitrogen-doped carbon-coated manganese ...

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Abstract

The invention belongs to the field of materials for lithium ion batteries, and discloses a nitrogen-doped carbon-coated manganous-manganic oxide composite material, as well as a preparation method andapplication thereof. The preparation method comprises the steps of dissolving manganese acetate and ammonium bicarbonate into ethylene glycol, carrying out solvent heat treatment at the temperature of 180 to 220 DEG C, and obtaining manganese carbonate; reacting with dopamine hydrochloride, and obtaining a manganese carbonate/polydopamine composite material; then calcining under an inert atmosphere, and finally oxidizing in a muffle furnace to obtain the nitrogen-doped carbon-coated manganous-manganic oxide composite material. The preparation method provided by the invention is simple and lowin cost; the prepared nitrogen-doped carbon-coated manganous-manganic oxide composite material is stable in structure and good in electrical conductivity, and has excellent rate performance and cyclic stability when being used as a lithium ion battery cathode material.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a nitrogen-doped carbon-coated trimanganese tetraoxide composite material and a preparation method and application thereof. Background technique [0002] With the rapid development of society, the use of fossil energy is increasing day by day. However, the problem of depletion of non-renewable fossil energy is becoming more and more serious. Scientists speculate that at the current rate of use, fossil fuels will be exhausted in 200 years. Moreover, the excessive use of fossil energy has also caused excessive emissions of greenhouse gases and serious environmental pollution. Smog is the direct result of excessive use of fossil energy, and the living environment and health of human beings are facing a huge threat. Therefore, the imminent issue is to devote ourselves to the development and utilization of clean energy. New clean energy, such as wind energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/505H01M10/0525
CPCH01M4/366H01M4/505H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 蒋仲杰秦艳敏
Owner SOUTH CHINA UNIV OF TECH
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