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Graphite composite material and preparation method thereof

A technology of composite materials and composite slurry, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of uneven coating, material rate performance deviation, liquid absorption capacity deviation, etc., to achieve enhanced cycle performance and Effects of rate performance, improvement of cycle performance and rate performance, and improvement of compacted density

Active Publication Date: 2018-04-24
CALB CO LTD +1
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Problems solved by technology

However, resin-based materials have poor affinity with graphite, and the carbon material resin obtained by pyrolysis has more volatiles during pyrolysis, high specific surface area, and low yield, which affects the cycle stability and cycle stability of graphite-coated materials. efficiency
When pitch is used to coat graphite, it is easy to cause graphite particles to bond to each other due to softening and deformation of pitch, making the coating uneven, and the carbon formed after pitch carbonization has deviations in liquid absorption capacity and electronic conductivity. Ion transmission, and at the same time, the small interlayer spacing of the high-rate charge-discharge material determines the deviation of the rate performance of the material, which affects the cycle performance, rate performance and cycle stability of graphite

Method used

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  • Graphite composite material and preparation method thereof
  • Graphite composite material and preparation method thereof

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Effect test

Embodiment 1

[0027] The preparation method of the graphite composite material of the present embodiment comprises the following steps:

[0028] 1) Add 8g of polyvinylidene fluoride binder to 500g of N-methylpyrrolidone, stir evenly, then add 92g of foam carbon, 3g of graphene and 3g of lithium metaaluminate, and disperse evenly at high speed to obtain foam carbon composite dispersion liquid;

[0029] 2) Add 300g of graphite to 600g of foamed carbon composite dispersion, disperse evenly, filter, transfer the solid to a tube furnace, sinter at 700°C for 3h under inert gas, then lower to room temperature, pulverize and classify to obtain porous Carbon coated graphite material;

[0030] 3) Add 15g of sodium fluoride and 3g of N-dodecylpyrrolidone to 100g of N-methylpyrrolidone, stir evenly, then add 100g of porous carbon-coated graphite material, soak at 80°C for 2h, filter, and vacuum at 80°C Drying, crushing, grading, that is.

[0031] The graphite composite material of this embodiment is...

Embodiment 2

[0034] The preparation method of the graphite composite material of the present embodiment comprises the following steps:

[0035] 1) Add 5g of polyvinylidene fluoride binder to 500g of N-methylpyrrolidone, stir evenly, then add 90g of carbon foam, 1g of graphene and 1g of lithium carbonate, and disperse evenly at high speed to obtain a composite dispersion of carbon foam;

[0036] 2) Add 200g of graphite to 600g of foamed carbon composite dispersion, disperse evenly, filter, transfer the solid to a tube furnace, sinter at 500°C for 5h under inert gas, then lower to room temperature, pulverize and classify to obtain porous Carbon coated graphite material;

[0037] 3) Add 10g of sodium fluoride and 1g of N-dodecylpyrrolidone to 100g of N-methylpyrrolidone, stir evenly, then add 100g of porous carbon-coated graphite material, soak at 50°C for 3h, filter, and vacuum at 80°C Drying, crushing, grading, that is.

[0038] The graphite composite material of this embodiment is obtain...

Embodiment 3

[0040] Add 10g of sodium alginate binder to 500g of N-methylpyrrolidone, stir evenly, then add 95g of carbon foam, 5g of graphene and 5g of lithium metaaluminate, and disperse evenly at high speed to obtain a composite dispersion of carbon foam;

[0041] 2) Add 400g of graphite to 600g of foamed carbon composite dispersion, disperse evenly, filter, transfer the solid to a tube furnace, sinter at 800°C for 1h under inert gas, then cool down to room temperature, pulverize and classify to obtain porous Carbon coated graphite material;

[0042] 3) Add 20g of sodium fluoride and 5g of N-dodecylpyrrolidone to 100g of N-methylpyrrolidone, stir evenly, then add 100g of porous carbon-coated graphite material, soak at 100°C for 1h, filter, and vacuum at 80°C Drying, crushing, grading, that is.

[0043] The graphite composite material of this embodiment is obtained by the preparation method of this embodiment.

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Abstract

The invention relates to a graphite composite material and a preparation method thereof and belongs to the technical field of the preparation of lithium-ion-battery negative-electrode active materials. The preparation method includes the steps of firstly, adding a porous-carbon material, a conductive agent, an inorganic lithium compound and an adhesive into a solvent, and evenly dispersing to obtain composite slurry; secondly, adding graphite into the composite slurry, evenly mixing, performing solid-liquid separation, sintering solid under inert gas protection and 500-800 DEG C for 1-5 hours,and coating the graphite material with porous carbon to obtain the graphite composite material. The preparation method has the advantages that a porous-carbon wrapping layer can be formed outside graphite, the compaction density of the material can be increased, and the stability of the material can be increased; by adding the inorganic lithium compound, a wrapping layer containing the inorganiclithium compound can be obtained, lithium ions consumed when a lithium-ion battery forms an SEI film during charge and discharge can be supplemented, and the circulating performance and rate performance of the material can be increased.

Description

technical field [0001] The invention relates to a graphite composite material and a preparation method thereof, belonging to the technical field of preparation of negative electrode active materials of lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and other fields due to their high energy density, good cycle life and environmental friendliness. Graphite materials are characterized by their low lithium insertion / deintercalation potential, suitable reversible capacity and abundant resources , low price and other advantages, it has become an ideal lithium-ion battery anode material, but at the same time, its low initial charge and discharge efficiency, poor cycle performance, and high selectivity to electrolyte limit the application of graphite materials. [0003] In order to solve the above-mentioned shortcomings of graphite materials, people have modified graphite through various methods, and carbon coating is ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 赵晓锋李利淼高娇阳宋文锋怀永建
Owner CALB CO LTD
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