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Fast-charging graphite composite material and preparation method thereof

A composite material and graphite technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of solid electrolyte electronic conductivity deviation, affecting rate performance cycle performance, large expansion, etc.

Active Publication Date: 2022-04-12
惠州市禾腾能源科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In this patent, although the fast charging performance of the composite material has been improved, there is a large expansion during the charging and discharging process of the core, and the intercalation rate is slow. At the same time, the electronic conductivity of the solid electrolyte in the outer layer is biased, which affects its rate performance and cycle performance

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  • Fast-charging graphite composite material and preparation method thereof
  • Fast-charging graphite composite material and preparation method thereof
  • Fast-charging graphite composite material and preparation method thereof

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preparation example Construction

[0040] Further, in order to improve the cycle performance of the fast-filling graphite composite material and reduce the expansion of the material during the cycle, in the present invention, a preparation method of the fast-filling graphite composite material is provided, the preparation of the fast-filling graphite composite material method, comprising the steps of:

[0041] S1: Add graphite to the oxidant solution and soak for 24 hours;

[0042] S2: Add 0.5% to 5% sodium carbonate solution to S1, stir evenly, heat at 50°C to 100°C for 1h to 6h, and filter;

[0043] S3: sintering the material obtained in S2 at a temperature of 200°C to 300°C to obtain a porous graphite material;

[0044] S4: Add the porous graphite material obtained in S3 to an organic solvent containing a solid electrolyte with a concentration of 1% to 10%, and stir evenly;

[0045] S5: The reaction is carried out in a high-pressure reactor at a temperature of 150°C to 200°C, and the reaction time is 3h to 6...

Embodiment 1

[0053] First, take 100ml of potassium perchlorate solution with a concentration of 1%, put 100g of artificial graphite into the potassium perchlorate solution, and soak for 24h; then take 500ml of sodium carbonate solution with a concentration of 1%, and add the solution after soaking for 24h to Sodium carbonate solution, stirred evenly, heated at 80°C for 3h, filtered, and then sintered at 250°C for 6h to obtain a porous graphite material.

[0054] Further, measure 100ml of triethanolamine containing 5% lithium lanthanum zirconium oxygen, put the porous graphite material into triethanolamine and stir evenly, then react in an autoclave with a temperature of 180°C, and the reaction time is 3h, so that the solid electrolyte is doped in the porous graphite material, followed by filtration and drying to obtain the precursor composite material A, that is, the inner shell.

[0055] Further, take 100g of composite material A and 10g of asphalt, mix them evenly, grind them, and then c...

Embodiment 2

[0057] First, take 500ml of potassium permanganate solution with a concentration of 1%, put 100g of artificial graphite into the potassium permanganate solution, and soak for 24 hours; then take 200ml of a sodium carbonate solution with a concentration of 0.5%, and soak it for 24 hours The solution was added to the sodium carbonate solution, stirred evenly, heated at 50° C. for 6 hours, filtered, and then sintered at 200° C. for 6 hours to obtain a porous graphite material.

[0058] Further, measure 100ml of triethanolamine containing 1% lithium lanthanum titanyl oxide, put the porous graphite material into triethanolamine and stir evenly, then react in an autoclave with a temperature of 150°C, and the reaction time is 6h, so that the solid electrolyte is doped in the porous graphite material, followed by filtration and drying to obtain the precursor composite material A, that is, the inner shell.

[0059] Further, weigh 100g of composite material A and 5g of asphalt, mix them...

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Abstract

The invention relates to a fast-charging graphite composite material and a preparation method thereof.The fast-charging graphite composite material comprises an inner shell and an outer shell, the outer shell comprises inorganic lithium salt, carbon nanotubes and the balance amorphous carbon, an inner core comprises porous graphite and solid electrolyte, one part of the solid electrolyte is embedded between layers of the porous graphite, and the other part of the solid electrolyte is embedded between the layers of the porous graphite. The other part is attached to the surface of the porous graphite; according to the invention, the high ionic conductivity of the solid electrolyte, the high electronic conductivity of the carbon nanotubes and the three-dimensional lithium-intercalation channel characteristic of the inorganic lithium salt are utilized, so that the transmission rate of lithium ions can be improved, the fast charging performance of the material is improved, and the expansion is reduced; through the preparation method, the binding force between the solid electrolyte and the inorganic lithium salt is improved, the stability of the inner shell structure can be enhanced, the fast-charging graphite composite material is well protected, the capacity loss of the material is reduced, and the cycle performance is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery materials, in particular to a fast-charging graphite composite material and a preparation method thereof. Background technique [0002] As the market demand for lithium-ion battery fast charging capability and mileage increase continues to increase, lithium-ion battery anode materials are required to have high energy density while their fast charging performance is also greatly improved; [0003] At present, lithium-ion batteries generally use graphite as the negative electrode, and its surface coating material is soft carbon or hard carbon. Since the intercalation / extraction of lithium ions in this material is mainly along the interlayer of the material during charge and discharge, there is a long path and easy Due to problems such as expansion, the transmission efficiency and diffusion rate of lithium ions are limited, and the volume expansion of the material is seriou...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M10/0562
Inventor 焦坤郑军欣余庆轩刘剑
Owner 惠州市禾腾能源科技有限公司
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