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Nitrogen-containing graphene coated biomass carbon negative material and preparation method thereof

A graphene-coated, biomass carbon technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of difficult processing, low cycle stability, unstable structure, etc., and achieve low cost and excellent cycle stability. , the effect of the best high current charge and discharge performance

Active Publication Date: 2019-06-28
SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a nitrogen-containing graphene-coated biomass carbon negative electrode material and a preparation method thereof, aiming at solving the problem of low cycle stability of existing lithium-ion battery negative electrode materials, structural Unstable and difficult to process technical problems

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  • Nitrogen-containing graphene coated biomass carbon negative material and preparation method thereof
  • Nitrogen-containing graphene coated biomass carbon negative material and preparation method thereof
  • Nitrogen-containing graphene coated biomass carbon negative material and preparation method thereof

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preparation example Construction

[0035] See figure 1 A method for preparing a nitrogen-containing graphene-coated biomass carbon negative electrode material provided by the invention comprises the steps of:

[0036] S10. Thermally mixing the biomass carbon powder with the nitrogen-containing graphene precursor polymer solution to obtain a nitrogen-containing graphene-coated biomass carbon precursor suspension slurry (micro-cured and cross-linked state);

[0037] S20. Spray drying the precursor suspension slurry to obtain nitrogen-containing graphene-coated biomass carbon precursor powder;

[0038] S30. Calcining the nitrogen-containing graphene-coated biomass carbon precursor powder at a high temperature under the protection of an inert atmosphere to obtain a nitrogen-containing graphene-coated biomass carbon negative electrode material.

[0039] In a preferred embodiment, the biomass carbon powder is prepared by the following method:

[0040] S01. Take a certain amount of plant raw material, dehydrate it, ...

Embodiment 1

[0070] Take 100 g of corn stalks and place them in a blast oven for dehydration at 120°C for 24 hours. Place the dehydrated plant material in an inert atmosphere at a heating rate of 10°C / min to 900°C, carbonize for 6 hours, and then use a traditional Chinese medicine pulverizer to Crushing treatment is carried out to obtain primary biomass carbon powder with a particle size range of 10-18 μm. The primary crushed product was placed in a blast oven for micro-oxidation treatment at 150° C. for 24 hours to obtain a micro-oxidized intermediate biomass carbon powder. Mix the medium-grade biomass carbon powder with 0.5mol / L oxalic acid solution according to the mass ratio of 1:1, and stir for 6 hours under mechanical stirring to obtain an acidic suspension. The acidic suspension is filtered to remove the filtrate, and the obtained solid is washed with deionized water several times until the filtrate is neutral to obtain high-purity biomass carbon powder. The obtained biomass carbon...

Embodiment 2

[0072]Take 100 g of sawdust and place it in a blast oven for dehydration at 120°C for 24 hours, place the dehydrated plant material in an inert atmosphere at a rate of 10°C / min to 900°C, carbonize for 6 hours, and then use a traditional Chinese medicine pulverizer Crushed to obtain primary biomass carbon powder with a particle size range of 10-18 μm. The primary crushed product was placed in a blast oven for micro-oxidation treatment at 150° C. for 24 hours to obtain a micro-oxidized intermediate biomass carbon powder. Mix the medium-grade biomass carbon powder with 0.5mol / L oxalic acid solution according to the mass ratio of 1:1, and stir for 6 hours under mechanical stirring to obtain an acidic suspension. The acidic suspension is filtered to remove the filtrate, and the obtained solid is washed with deionized water several times until the filtrate is neutral to obtain high-purity biomass carbon powder. The obtained biomass carbon powder and the nitrogen-containing graphene...

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Abstract

The invention discloses a nitrogen-containing graphene coated biomass carbon negative material and a preparation method thereof. According to the method, a plant raw material is dehydrated at low temperature, the raw material is carbonized at high temperature to obtain a primary biomass powdered carbon material, a final biomass powdered carbon material is obtained after removing impurities, the biomass powdered carbon material is mixed uniformly with a nitrogen-containing graphene precursor polymer solution according to certain mass proportion, the mixed solution is heated and stirred to obtain a micro-solidified crosslinking slurry, a solvent is removed by spray drying, particle shaping is carried out by means of air-flow grinding and the like, and high-temperature calcining is implemented to obtain the nitrogen-containing graphene coated biomass carbon negative material. The preparation method is green, technology is simple, source of raw materials is wide, the cost is low, and the prepared nitrogen-containing graphene coated biomass carbon negative material has extremely high heavy current charging / discharging performance, high circulation stability, high first coulombic efficiency, and high charging / discharging specific capacity.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a nitrogen-containing graphene-coated biomass carbon negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery, as a secondary battery, realizes the storage and release of electric energy through the migration, transmission, insertion and extraction of lithium ions between the positive and negative electrodes. With the emergence and gradual popularization of hybrid electric vehicles and pure electric vehicles, there is an urgent need for next-generation lithium-ion batteries with high energy density, high safety, low cost, long cycle life, and environmental protection. [0003] Nitrogen-doped graphene, introducing nitrogen doping into the graphene lattice, changing the distribution of electrons in graphene, making graphene exhibit better electrochemical properties, and nitrogen doping makes the graphene s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/10
Inventor 刘剑洪陈文沛黄少銮李芳孔金丽张小勇刘金鑫欧阳晓平孙学良吴奇
Owner SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD
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