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Sodium-ion battery carbon negative electrode material and preparation method thereof

A carbon anode material, a technology for sodium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as effective insertion and de-insertion of unfavorable sodium ions, difficulty in meeting high-efficiency sodium-ion batteries, and lack of reactive sites. , to achieve the effect of more reactive sites, shortened transmission distance, and abundant pore channels

Active Publication Date: 2016-08-17
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Elemental metals, metal oxides, alloys and non-metallic elements all have high specific capacity, but the volume expansion of such materials is serious during the charging and discharging process, which leads to the electrode being easily pulverized and the cycle life is short. Methods such as coating and doping to reduce the volume expansion of materials are the main means at present.
[0005] Graphene material has high mechanical strength, but its low porosity and lack of reactive active sites inhibit the diffusion of sodium ions and electrolyte, which is not conducive to the effective intercalation and deintercalation of sodium ions, and it is difficult to meet the needs of high-efficiency sodium-ion batteries

Method used

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  • Sodium-ion battery carbon negative electrode material and preparation method thereof

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Embodiment 1

[0058] Add 2g of lignin to 20ml of 0.1mol / L sodium hydroxide solution, stir at room temperature for 1h to form a uniform suspension; use the modified Hummer method to prepare graphene oxide; measure 50ml of 5g / L graphene oxide dispersion, Graphene oxide was obtained by freeze-drying at -50°C for 20 hours, and the obtained graphene oxide was added into 50 ml of deionized water, and dispersed by ultrasonication at room temperature for 1 hour to obtain a uniform graphene oxide dispersion. Mix and stir the above two dispersions for 1 h, add 10 ml of silica template emulsion (the particle size of the template emulsion is 140 nm, and the volume concentration of the template emulsion is 40%), and place the mixed solution in a hydrothermal reaction kettle for hydrothermal reaction for 150 ℃ 20h, cooled to room temperature, filtered to obtain black particles. Add the obtained black granules to 20ml of 10% hydrofluoric acid, stir for 5h, filter, then wash 3 times with deionized water, t...

Embodiment 2

[0061] Add 3g of lignin to 20ml of 0.5mol / L sodium hydroxide solution, stir at room temperature for 1h to form a uniform suspension; use the modified Hummer method to prepare graphene oxide; measure 100ml of 5g / L graphene oxide dispersion, Graphene oxide was obtained by freeze-drying at -50°C for 40 hours, and the obtained graphene oxide was added to 100 ml of deionized water, and dispersed by ultrasonication at room temperature for 2 hours to obtain a uniform graphene oxide dispersion. Mix and stir the above two dispersions for 2 hours, add 20ml of magnesium carbonate template emulsion (template emulsion particle size is 50nm, template emulsion volume concentration is 20%), put the mixed solution in a hydrothermal reaction kettle for hydrothermal reaction at 160°C 15h, cooled to room temperature, and filtered to obtain black particles. Add the obtained black particles to 60ml of 10% hydrofluoric acid, stir for 5h, filter, then wash with deionized water for 3 times, then wash ...

Embodiment 3

[0064] Add 2g lignin to 20ml 1mol / L sodium hydroxide solution, stir at room temperature for 2h to form a uniform suspension; use the improved Hummer method to prepare graphene oxide; measure 100ml 5g / L graphene oxide dispersion, Freeze-dry at -50°C for 40 hours to obtain graphene oxide, add the obtained graphene oxide into 20 ml of deionized water, and disperse by ultrasonication at room temperature for 0.5 hours to obtain a uniform graphene oxide dispersion. Mix and stir the above two dispersions for 1 hour, add 15ml of calcium carbonate template emulsion (template emulsion particle size is 100nm, template emulsion volume concentration is 30%), put the mixed solution in a hydrothermal reaction kettle for hydrothermal reaction at 200°C 20h, cooled to room temperature, filtered to obtain black particles. Add the obtained black particles to 50ml of 10% hydrofluoric acid, stir for 5h, filter, then wash with deionized water for 3 times, then wash with absolute ethanol for 2 times,...

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Abstract

The invention discloses a sodium-ion battery carbon negative electrode material. Raw materials of disordered low-graphitizing carbon materials coat or clad porous oxidized graphene or porous graphene through a hydrothermal method to obtain a carbon material precursor, the carbon material precursor is subjected to further carbonization and activation to form the sodium-ion battery carbon negative electrode material with porous graphene coated or cladded with the disordered low-graphitizing carbon materials, and the raw materials of the disordered low-graphitizing carbon materials are lignin. The invention further discloses a preparation method of the sodium-ion battery carbon negative electrode material. The obtained carbon material with the porous graphene cladded with the disordered low-graphitizing carbon has the advantages of being uniform in porosity distribution, appropriate in layer spacing, high in porosity, large in specific area, good in electrical conductivity and the like, and the composite material is used for a sodium-ion battery, and the good battery performance is shown.

Description

technical field [0001] The invention relates to the field of sodium ion batteries, in particular to a carbon negative electrode material for a sodium ion battery and a preparation method thereof. Background technique [0002] Among many secondary batteries, lithium-ion batteries have developed rapidly and are widely used in many fields because of their advantages such as high energy density, high power density, good rate performance and portability. At the same time, the limitation of lithium resources is bound to limit the development of lithium-ion batteries. It is imperative to research and develop new secondary battery systems, and sodium-ion batteries are expected to become the next generation of large-scale and widely used secondary batteries. Compared with other secondary batteries, sodium-ion batteries have the following advantages: 1. The sodium reserves are abundant, laying the foundation for the development of sodium-ion batteries; 2. The principle is similar to ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/054
CPCH01M4/366H01M4/587H01M4/625H01M10/054Y02E60/10
Inventor 张治安陈玉祥李劼李军明史晓东赖延清张凯
Owner CENT SOUTH UNIV
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