High-performance amorphous graphite negative electrode material and low-cost preparation method thereof

A technology of microcrystalline graphite and negative electrode materials, applied in chemical instruments and methods, battery electrodes, inorganic chemistry, etc., can solve the problems of unsatisfactory cycle performance, high irreversible capacity loss, low tap density and fixed carbon content, etc. problems, to achieve the effect of avoiding purification treatment, high carbon residue rate and high density

Active Publication Date: 2019-05-31
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This negative electrode material has higher capacity and better rate performance than traditional graphite negative electrode materials, but the tap density and fixed carbon content of this negative electrode material are low, the first irreversible capacity loss is high, and the cycle performance is not ideal.

Method used

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  • High-performance amorphous graphite negative electrode material and low-cost preparation method thereof
  • High-performance amorphous graphite negative electrode material and low-cost preparation method thereof

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preparation example Construction

[0023] The invention discloses a low-cost preparation method of a high-performance microcrystalline graphite negative electrode material, which includes the following steps:

[0024] (1) Grinding and shaping: the microcrystalline graphite with a fixed carbon content ≥ 90% after preliminary flotation is pulverized by a mechanical mill and then put into a stirring ball mill, adding grinding aids, stirring and grinding, after grinding, the material is dried, and then air-selected Grading to obtain microcrystalline graphite microspheres with a particle size D50=5-15 μm and smooth surface, clean and free of floating powder;

[0025] The mechanical pulverization refers to pulverizing the dry concentrate obtained after preliminary flotation with an ultra-fine mechanical mill to obtain microcrystalline graphite powder with a particle size of D50=5-25 μm.

[0026] Described grinding, the grinding ball that adopts is agate ball, diameter 5-10mm, slurry concentration 10-20%; Material bal...

Embodiment 1

[0033] A low-cost preparation method of a high-performance microcrystalline graphite negative electrode material, comprising the following steps:

[0034] (1) Grinding and shaping: the microcrystalline graphite with a fixed carbon content of 91% after preliminary flotation is pulverized by a mechanical mill and then put into a stirring ball mill, adding grinding aids, stirring and grinding, and drying the ground material, and then air selection Grading to obtain microcrystalline graphite microspheres with a particle size of D50=12 μm, smooth surface, clean and free of floating powder;

[0035] The mechanical pulverization refers to pulverizing the dry concentrate obtained after preliminary flotation with an ultra-fine mechanical mill to obtain microcrystalline graphite powder with a particle size of D50=14 μm.

[0036] In the grinding, the grinding balls used are agate balls with a diameter of 5mm and a slurry concentration of 10%; the mass ratio of the balls to the balls is 1...

Embodiment 2

[0042] A low-cost preparation method of a high-performance microcrystalline graphite negative electrode material, comprising the following steps:

[0043] (1) Grinding and shaping: the microcrystalline graphite with a fixed carbon content of 93% after preliminary flotation is pulverized by a mechanical mill and then put into a stirring ball mill, adding grinding aids, stirring and grinding, and drying the ground material, and then air selection Grading to obtain microcrystalline graphite microspheres with a particle size of D50=14 μm, smooth surface, clean and free of floating powder;

[0044] The mechanical pulverization refers to pulverizing the dry concentrate obtained after preliminary flotation with an ultra-fine mechanical mill to obtain microcrystalline graphite powder with a particle size of D50=16 μm. In the grinding, the grinding balls used are agate balls with a diameter of 10mm and a slurry concentration of 20%; the mass ratio of the ball to the ball is 1:6, and th...

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Abstract

The invention discloses a high-performance amorphous graphite negative electrode material and a low-cost preparation method thereof. The method includes the steps: (1) crushing and shaping; (2) graphene / furfural resin mixed liquid preparation; (3) coating and granulating; (4) treatment at multistage temperatures. An asphalt / furfural resin composite coating material has high carbon yield, densityand graphitization degree, graphene is doped into the material, and the material is used for enhancing high conductivity and toughness of electrons / ions and improving structure stability. By the aid of a multistage temperature treatment mode, carbonization, graphitization and amorphous graphite purification are combined and implemented, complicated purification of high-purity amorphous graphite isavoided, the method is green and environmentally friendly, processes are simplified, and cost is reduced.

Description

technical field [0001] The invention relates to the technology in the field of negative electrode materials, in particular to a high-performance microcrystalline graphite negative electrode material and a low-cost preparation method thereof. Background technique [0002] Natural graphite has become the main anode material of lithium batteries because of its high charge and discharge capacity, good charge and discharge platform, wide range of sources, and low cost. Natural graphite is divided into flake graphite and microcrystalline graphite. Flake graphite has complete crystallization and high orientation. During the charge and discharge process, the intercalation and extraction of lithium ions cause about 10% expansion and contraction of the d002 interlayer distance. In the long-term cycle process It will lead to the collapse between the layers and cause the material to pulverize and fall off. The macroscopic isotropy of microcrystalline graphite makes its cycle stability ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01M4/36H01M4/587H01M4/62H01M10/0525
CPCY02E60/10
Inventor 邱从交赵东辉周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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