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Carbon composite negative electrode material and preparation method thereof

A negative electrode material and composite material technology, applied in the field of lithium-ion battery materials, can solve the problems of low initial efficiency, small tap density, and restrictions on the promotion and use of materials, and achieve high initial efficiency, high tap density, and excellent fast charging performance Effect

Active Publication Date: 2018-03-09
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this material has defects such as low first-time efficiency and low tap density, which limit the popularization and use of its materials.

Method used

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  • Carbon composite negative electrode material and preparation method thereof
  • Carbon composite negative electrode material and preparation method thereof
  • Carbon composite negative electrode material and preparation method thereof

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Effect test

Embodiment 1

[0032] The preparation method of the carbon composite negative electrode material of the present embodiment comprises the following steps:

[0033] 1) Add 5 mL of isopropanol solution of phenolic resin with a concentration of 0.5 mol / L to 1000 mL of an aqueous solution of graphene oxide with a concentration of 5 mg / mL, mix and disperse evenly, and pass gas oxidant chlorine gas into the mixed liquid for 30 min , the gas flow rate is 10mL / min, while stirring to make it evenly mixed to obtain the pretreatment mixture;

[0034] 2) Add the above-mentioned pretreatment mixture into a high-pressure reactor, the pressure in the reactor is 2MPa, and the temperature is controlled at 180°C for 6 hours, then filtered, the solid is vacuum-dried at 50°C for 48 hours, and crushed to obtain a high-density composite powder body, carbonized at 800°C for 4h to obtain a hard carbon / graphene composite;

[0035] 3) Add 100mL of a conductive dispersion of carbon nanotubes with a mass fraction of 4%...

Embodiment 2

[0038] The preparation method of the carbon composite negative electrode material of the present embodiment comprises the following steps:

[0039] 1) Add 1mL of tetrahydrofuran solution of epoxy resin with a concentration of 1mol / L to 1000mL of graphene oxide aqueous solution with a concentration of 1mg / mL. The flow rate of feeding is 1mL / min, while stirring to make it evenly mixed to obtain the pretreatment mixture;

[0040] 2) Add the above-mentioned pretreatment mixture into a high-pressure reactor, the pressure in the reactor is 1.0 MPa, and the temperature is controlled at 150°C for 12 hours, then filtered, and the solid is vacuum-dried at 50°C for 24 hours, crushed to obtain a high-density composite Powder, carbonized at 800°C for 4 hours to obtain a hard carbon / graphene composite material;

[0041] 3) Add 100mL of a conductive dispersion of carbon nanotubes with a mass fraction of 1% in water to 1000mL of an aqueous solution of sucrose with a mass fraction of 1%, and ...

Embodiment 3

[0044] The preparation method of the carbon composite negative electrode material of the present embodiment comprises the following steps:

[0045] 1) Add 10mL of pyridine solution of furfural resin with a concentration of 0.1mol / L to 1000mL of an aqueous solution of graphene oxide with a concentration of 10mg / mL. After mixing and dispersing evenly, pass gas oxidant ozone into the mixed solution for 60min, and the gas The flow rate of feeding is 50mL / min, while stirring to make it mix evenly to obtain the pretreatment mixture;

[0046] 2) Add the above-mentioned pretreatment mixture into a high-pressure reactor, the pressure in the reactor is 5MPa, and the temperature is controlled at 200°C for 2 hours, then filtered, the solid is vacuum-dried at 50°C for 96 hours, and crushed to obtain a high-density composite powder body, carbonized at 800°C for 4h to obtain a hard carbon / graphene composite;

[0047] 3) Add 100mL of a conductive dispersion of carbon nanotubes with a mass fr...

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Abstract

The invention relates to a carbon composite negative electrode material and preparation method thereof and belongs to the technical field of lithium ion battery materials. The preparation method of the carbon composite negative electrode material comprises uniformly mixing organic polymer solution with graphene oxide solution, and then inletting gaseous oxidizing agent to obtain a preprocessed liquid mixture, wherein the applied organic polymer is one of phenolic resin, epoxy resin, furfural resin and acrylic resin; enabling the obtained preprocessed liquid mixture to react at 150-200 DEG C for 2-12 h, performing solid-liquid separation, carbonizing obtained solid at 750-850 DEG C to obtain a hard carbon / graphite composite material; uniformly mixing carbon nano tubes, carbon sources, lithium salt additives and water, then adding in and uniformly mixing the obtained hard carbon / graphite composite material, and performing solid-liquid separation and solid carbonization to obtain the carbon composite negative electrode material. The prepared carbon composite negative electrode material is good in electric conductivity, high in initial efficiency and tap density and excellent in fast charge performance.

Description

technical field [0001] The invention relates to a preparation method of a carbon composite negative electrode material and the carbon composite negative electrode material, belonging to the technical field of lithium ion battery materials. Background technique [0002] As the market's requirements for start-stop power supply increase, batteries used as vehicle start-up power generally require higher charge-discharge cycle life, continuous impact discharge start-up capability, stronger charge acceptance capability, and low-temperature charge capability. In lithium-ion batteries, the negative electrode is the key factor affecting its fast charging performance. At present, the negative electrode materials used in lithium-ion batteries are graphite materials, which have disadvantages such as poor rate charge and discharge capabilities and poor safety performance, making it difficult to meet the needs of start-stop power supply. [0003] At present, the negative electrode materia...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 赵晓锋李利淼张要军万爽宋文锋怀永建
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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