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Preparation method of coal-based graphite/carbon composite negative electrode material for power type lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in the preparation/purification of carbon, battery electrodes, negative electrodes, etc., can solve the problems of difficulty in controlling the expansion degree of layer expansion, and achieve easy process control, easy process control, and accelerated diffusion. Effect

Pending Publication Date: 2022-02-15
博尔特新材料(银川)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a method for preparing a coal-based graphite / carbon composite negative electrode material for a power lithium-ion battery, which adopts an environmentally friendly controllable low-temperature, low-pressure micro-expansion technology to solve the problem of conventional graphite expansion. Solvent treatment and environmental protection problems caused by wet processes such as oxidation exfoliation reduction and electrochemical expansion, as well as the difficulty in controlling the degree of layer expansion and expansion in conventional processes, thereby improving the power of coal-based graphite / carbon composite negative electrode materials, extending cycle life, and reducing production cost, and suitable for large-scale industrialization

Method used

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  • Preparation method of coal-based graphite/carbon composite negative electrode material for power type lithium ion battery
  • Preparation method of coal-based graphite/carbon composite negative electrode material for power type lithium ion battery
  • Preparation method of coal-based graphite/carbon composite negative electrode material for power type lithium ion battery

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Embodiment 1

[0037] The preparation method of the coal-based graphite / carbon composite negative electrode material for the power type lithium ion battery of the present embodiment comprises the following steps:

[0038] (1) 9% deionized water and 1% surfactant stearic acid are fully and uniformly mixed with a ZSJ-8 blending machine for 2 hours at a speed of 500 rpm to obtain a graphitized anthracite with a particle size D50 of 8.0 μm and a mass percentage of 9% to obtain Moisten the mixture.

[0039] (2) Put the wet mixture obtained in the above steps into a 2.5kg popcorn machine, seal the cover, heat up to 280°C at a speed of 10°C / min by gas heating, and then keep warm at this temperature until the pressure is 0.5 MPa, maintain for 5min.

[0040] (3) The above-mentioned thermal insulation and pressure keeping popcorn machine is released to the normal pressure within 10s to complete the pressure relief process, and the precursor of the micro-expanded graphitized anthracite is obtained.

...

Embodiment 2

[0045] The preparation method of the coal-based graphite / carbon composite negative electrode material for the power type lithium ion battery of the present embodiment comprises the following steps:

[0046] (1) be that the graphitized anthracite of particle size D50 is 4.0 μm and mass percent be 20% deionized water and 2% surfactant sodium dodecylbenzene sulfonate fully and evenly mix 0.5 with VC mixer with 150rpm rotating speed hours, a wet mixture was obtained.

[0047] (2) Put the wetted mixture obtained in the above steps into a Supor SY-30FC8058Q pressure cooker, cover it well, raise the temperature to 130°C at a speed of 20°C / min by means of electric heating, and then keep it warm at this temperature until the pressure is 0.15 MPa, maintain for 10min.

[0048] (3) Release the above-mentioned heat-preserving and pressure-holding pressure cooker to normal pressure within 30s to complete the pressure relief process, and prepare the precursor of micro-expanded graphitized a...

Embodiment 3

[0053] The preparation method of the coal-based graphite / carbon composite negative electrode material for the power type lithium ion battery of the present embodiment comprises the following steps:

[0054] (1) The graphitized anthracite with a particle size D50 of 18.0 μm, 1.0% deionized water and 0.05% surfactant ethanol were fully and uniformly mixed with a stirring mixer at a speed of 35 rpm for 3 hours to obtain a wet mixture.

[0055] (2) Put the wetting mixture prepared in the above steps into Qiuzuo Technology FCF-5 reactor, heat up to 350°C at a rate of 2°C / min by microwave heating, and then keep warm at this temperature until the pressure is 1.0 MPa, maintain for 2 minutes.

[0056] (3) Release the pressure of the heat-preserved and pressure-maintained reaction kettle to normal pressure within 3s to complete the pressure relief process, and prepare the precursor of micro-expanded graphitized anthracite.

[0057] (4) Add the micro-expanded graphitized anthracite prec...

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Abstract

The invention discloses a preparation method of a coal-based graphite / carbon composite negative electrode material for a power type lithium ion battery. The method comprises the steps of wetting and mixing, heating and pressurizing, pressure relief treatment, coating modification, carbonization treatment and the like. According to the invention, graphitized anthracite micro powder is used as a raw material, and an environment-friendly solid-phase, low-temperature and low-pressure controllable micro-expansion technology and processes such as coating and carbonization are adopted, so that the prepared negative electrode material has a porous structure and a microcrystal particle structure microcosmically. In addition, the interlamellar spacing of the graphite sheets is enlarged, the graphite sheets are macroscopically represented as micron-scale particles, and the specific surface area is greatly reduced; therefore, a short and developed diffusion channel is easily provided for diffusion of lithium ions, so that diffusion of the lithium ions is accelerated, the lithium ions are suitable for being embedded and embedded out in the charging and discharging process under the conditions of high power and low temperature; meanwhile, the amorphous carbon shell protection layer enables the microcrystalline structure to have structural stability, and charging and discharging under the condition of long circulation can be met. The material has excellent multiplying power, low-temperature performance and cycle performance, and is suitable for being used as a power type lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of new energy lithium-ion battery materials, in particular to a method for preparing a coal-based graphite / carbon composite negative electrode material for a power-type lithium-ion battery. Background technique [0002] Coal, as the most important basic energy and energy security ballast stone in our country, must take the innovative path of intelligent green development and clean and low-carbon utilization, and promote coal resources to become the most competitive energy and raw material resources through continuous technological innovation. The development of coal non-combustion utilization technology has a very broad market space and higher economic value in the fields of chemical industry and materials, and lithium-ion batteries, as one of the key energy storage devices and technologies for the development and utilization of new energy, use coal as lithium The development and utilization of anode materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C01B32/05H01M4/36H01M4/587H01M4/62H01M10/0525
CPCC01B32/205C01B32/05H01M4/366H01M4/587H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 侯春平马少宁王兴蔚侯佼马勇贺超杨丹
Owner 博尔特新材料(银川)有限公司
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