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A kind of preparation method of porous nitrogen-doped carbon-coated graphite material

A technology of nitrogen-doped carbon and graphite materials, applied in structural parts, electrical components, battery electrodes, etc., to achieve good spreadability, excellent cycle performance and rate performance, and good conductivity

Active Publication Date: 2021-01-19
HUBEI RT ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on nitrogen-doped carbon-coated graphite to improve the electrical properties of graphite.

Method used

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  • A kind of preparation method of porous nitrogen-doped carbon-coated graphite material
  • A kind of preparation method of porous nitrogen-doped carbon-coated graphite material
  • A kind of preparation method of porous nitrogen-doped carbon-coated graphite material

Examples

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Effect test

Embodiment 1

[0020] This embodiment provides a method for preparing a porous nitrogen-doped carbon-coated graphite material, which at least includes the following steps:

[0021] Step 1, first weigh 150g melamine, 200g citric acid as organic acid, 0.5g modified graphene powder, 1000g ethanol as solvent, mix well on a small stirrer, then weigh 1000g D50=15 μm artificial graphite, pour Put it into a mixing tank, stir evenly, transfer it to an oven at 80°C for drying. Wherein, the modified graphene is graphene grafted with -OOH, -OH functional groups.

[0022] Step 2: Grind after drying, pass through a 325-mesh sieve, and put the powder into the cavity of the rotary furnace. The rotating speed of the rotary furnace is 800rpm, and N2 protection is introduced, heated to 300°C, and kept for 3 hours. The amino groups of melamine and The organic acid and the carboxyl group in the modified graphene react to form functional structural components containing C-N bonds, and the carboxyl group of the o...

Embodiment 2

[0025] This embodiment provides a method for preparing a porous nitrogen-doped carbon-coated graphite material, which at least includes the following steps:

[0026] Step 1, first take by weighing 250g melamine, 250g citric acid as organic acid, 8g modified graphene powder, 2000g ethanol as solvent, mix on small stirrer, then take by weighing 1000g D50=6 μ m natural graphite, pour into In a stirring tank, after stirring evenly, transfer to a 100°C oven for drying. Among them, the modified graphene is graphene grafted with -OOH, -OH functional groups

[0027] Step 2: Grind after drying, pass through a 325-mesh sieve, and put the powder into the cavity of the rotary furnace. React with organic acids and carboxyl groups in modified graphene to form functional structural components containing C-N bonds, carboxyl groups of organic acids and hydroxyl groups in modified graphene to generate esters, and then continue to heat up to 900°C for carbonization for 5 hours. After the sampl...

Embodiment 3

[0030] This embodiment provides a method for preparing a porous nitrogen-doped carbon-coated graphite material, which at least includes the following steps:

[0031] Step 1, first weigh 200g melamine, 180g stearic acid as organic acid, 4g modified graphene powder, 1500g isopropanol as solvent, mix well on a small stirrer, and then weigh 1000g D50=18 μm natural graphite , poured into a mixing tank, stirred evenly, transferred to a 150°C oven for drying. Wherein, the modified graphene is graphene grafted with -OOH, -OH functional groups.

[0032] Step 2: Grind after drying, pass through a 325-mesh sieve, and put the powder into the cavity of the rotary furnace. React with organic acid and carboxyl group in modified graphene to generate functional structural components containing C-N bonds, carboxyl group of organic acid and hydroxyl group in modified graphene to generate esters. Then continue to heat up to 700°C for carbonization for 6h. After the sample is cooled, the sample...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a porous nitrogen-doped carbon-coated graphite material. The preparation method comprises the following steps: uniformly mixing melamine, organic acid and modified graphene in a solvent, wherein the melamine is used as a nitrogen source, the organic acid is used as a carbon source and the modified graphene is used as a conductive bridge, then adding graphite, evenly mixing, and drying; grinding and sieving the mixed dry material, then transferring the material to a rotarykiln, introducing an inert atmosphere, heating up to 100-500 DEG C, and then continuously heating and carbonizing for 0.5-24h; cooling and then scattering, and sieving to obtain the porous nitrogen-doped carbon-coated graphite material having a coating layer pore size of less than 5 nm. Compared with the prior art, the preparation method adopts an in-situ nitrogen-doped carbon graphite material so as to obtain the modified graphite material; the cycle performance of the material is obviously improved, and the rate capability of the material is good. Furthermore, the method is simple and low in cost, thus being suitable for large-scale production application.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a preparation method of a porous nitrogen-doped carbon-coated graphite material. Background technique [0002] Due to the advantages of low cost and high energy density, graphite-based carbon materials have always occupied a dominant position in the entire lithium-ion battery anode material market. It relies on the deintercalation of lithium ions in the graphite layer in the electrochemical system: 6C+xLi+→LixC6 (0<x<1), the theoretical capacity is 372mAh / g. [0003] In recent years, due to the continuous development of the field of electric vehicles, the Ministry of Industry and Information Technology currently requires the energy density of a single battery to reach 300wh / kg in the 2020 planning goal, and the cost is reduced to below 1.5 yuan / wh. is a huge challenge. Focusing on carbon materials, researchers have carried out in-depth research on nano-micropo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/366Y02E60/10
Inventor 贺艳兵谌芳园康飞宇何中林王鹏武洪彬其他发明人请求不公开姓名
Owner HUBEI RT ADVANCED MATERIALS CO LTD
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