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High-specific-surface-area carbon negative electrode material modified by stable components, preparation method of carbon negative electrode material and sodium-ion battery using carbon negative electrode material

A carbon negative electrode material with a high specific surface area technology, which is applied in the direction of negative electrodes, secondary batteries, battery electrodes, etc., can solve the problems of surface carbon defects, affecting the first coulombic efficiency and cycle stability of materials, and avoid the overheating of metal oxides. Thick cladding and uneven cladding, avoiding costly and low-yield effects

Inactive Publication Date: 2019-04-16
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, carbon-based materials are often used as negative electrode materials for sodium-ion batteries, but various carbon-based materials, such as hard carbon, soft carbon, graphene, and porous carbon, all have problems such as many surface carbon defects, which greatly affect the The first Coulombic efficiency and cycle stability of the material

Method used

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  • High-specific-surface-area carbon negative electrode material modified by stable components, preparation method of carbon negative electrode material and sodium-ion battery using carbon negative electrode material
  • High-specific-surface-area carbon negative electrode material modified by stable components, preparation method of carbon negative electrode material and sodium-ion battery using carbon negative electrode material
  • High-specific-surface-area carbon negative electrode material modified by stable components, preparation method of carbon negative electrode material and sodium-ion battery using carbon negative electrode material

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preparation example Construction

[0028] The invention provides a preparation method of a high specific surface area carbon negative electrode material modified by a stable component. The preparation method comprises the following steps:

[0029] Step S1: Weigh graphite oxide, the mass ratio of graphite oxide to deionized water can be in the range of 1:100 to 1:1000, place graphite oxide in a plastic beaker and add deionized water in the above proportion, then place the beaker Place in an ice-water bath environment and place in an ultrasonic stirrer to stir for 0.5-6 hours. After the treatment is completed, a graphene oxide aqueous dispersion of 1 mg / mL-10 mg / mL is obtained.

[0030] Step S2: Put 80mL of the graphene aqueous dispersion with the concentration described in S1 in a 100mL hydrothermal kettle, seal the hydrothermal kettle and place it in an explosion-proof oven, and keep the hydrothermal kettle at 120-200°C Keep warm at high temperature for 4 to 24 hours. Turn off the insulation or heating functi...

no. 1 example

[0039] Step S1: Weigh 160mg of graphite oxide into a 100mL plastic beaker of a certain capacity and add 80mL of deionized water, then place the beaker in an ice-water bath environment and place it in an ultrasonic cell pulverizer for ultrasonic treatment for 2 hours, after the treatment is completed A 2 mg / mL graphene oxide aqueous dispersion was obtained.

[0040] Step S2: Put 80 mL of the graphene aqueous dispersion in a 100 mL hydrothermal kettle, seal the hydrothermal kettle and place it in an explosion-proof oven, and keep the hydrothermal kettle at a temperature of 180° C. for 12 hours. Then, the graphene aqueous dispersion was cooled to room temperature with the furnace, and then it was pre-frozen with liquid nitrogen. The graphene aqueous dispersion was placed in a lyophilizer to freeze-dry for 24 hours to obtain a graphene macrobody (PGM).

[0041] Step S3: Weigh 100 mg of aluminum chloride, and place it in an aluminum oxide solution of 10 mL of absolute ethanol and ...

no. 2 example

[0045] The only difference between the second embodiment and the first embodiment is that the mass of aluminum chloride added in step S3 of the second embodiment is 1000 mg, and the temperature is kept at 160° C. for 24 hours after washing.

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Abstract

The invention provides a high-specific-surface-area carbon negative electrode material modified by stable components. The specific surface area of the carbon negative electrode material is greater than 20 m<2> / g. The stable components modify the carbon negative electrode material, the stable components and the carbon negative electrode material have chemical bonds, the chemical bonds are located at defect positions of the carbon negative electrode material, and the mass of the stable components accounts for 0.1-20.2 w% of the total mass of the high-specific-surface-area carbon negative electrode material. The invention also provides a preparation method of the high-specific-surface-area carbon negative electrode material modified by the stable components and a sodium-ion battery using thehigh-specific-surface-area carbon negative electrode material modified by the stable components.

Description

technical field [0001] The invention relates to the field of sodium ion battery materials, in particular to a high specific surface area carbon negative electrode material modified by a stable component, a preparation method thereof and a sodium ion battery using the same. Background technique [0002] Since the beginning of the 21st century, the shortage of fossil energy and environmental pollution have become more and more serious. These problems have also attracted the attention of the whole society in China. The task of developing renewable green and environmentally friendly new energy has become very urgent. Lithium-ion batteries have been used in digital products and electric vehicles due to their advantages such as high energy density and excellent cycle performance. However, lithium reserves are low and the distribution is seriously uneven. The lack of lithium resources and the high cost of development restrict its application and large-scale energy storage. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/194H01M4/36H01M4/587H01M4/62H01M10/054
CPCC01B2204/22C01B2204/32C01B32/184C01B32/194H01M4/362H01M4/587H01M4/628H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 吕伟林乔伟张俊杨全红康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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