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Graphite negative electrode material, preparation and application thereof

A graphite anode and graphite technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of small interlayer spacing, large EIS, low high-rate discharge retention rate, etc., and achieve easy mass production and reduce adverse effects. , the effect of short preparation cycle

Active Publication Date: 2021-04-16
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problems of the existing graphite negative electrode materials such as small layer spacing, large EIS, and low high-rate discharge retention rate, and provide a graphite negative electrode material and its preparation and application

Method used

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  • Graphite negative electrode material, preparation and application thereof
  • Graphite negative electrode material, preparation and application thereof
  • Graphite negative electrode material, preparation and application thereof

Examples

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Embodiment 1

[0056] The preparation method of the graphite negative electrode material of the present embodiment, concrete steps are:

[0057] Step 1. Mechanically pulverizing oil-based needle coke as a raw material to obtain 100 kg of particles with an average particle size of 5.8 μm and a particle size range of 0.9-24.5 μm;

[0058] Step 2. Put the obtained granules into a horizontal reactor, and granulate under an inert atmosphere. The temperature of granulation is 700°C, and the time is 8 hours, so as to remove part of the volatile matter. The reaction process makes the surface of the granules and micropores A thin layer of gas-phase carbon is coated in the middle;

[0059] Step 3: Perform high-temperature graphitization treatment on the obtained material. The graphitization temperature is 3000°C and the time is 30 hours. ≥330mAh / g;

[0060] Step 4, classifying the obtained artificial graphite particles, screening out artificial graphite fine particles with an average particle size o...

Embodiment 2

[0065] This embodiment is similar to embodiment 1, the difference is that: the preparation process does not go through step 4 classification treatment. The obtained artificial graphite negative electrode material for lithium-ion batteries is a single particle with an average particle size of 6.3 μm and a particle size distribution range of 0.7-26.0 μm, including graphite and a hard carbon layer uniformly coated outside the graphite, the carbon The thickness of the layer is 5-50 nm.

Embodiment 3

[0067] This example is similar to Example 1, except that: in step one, the average particle size is 4.5 μm obtained by mechanical pulverization, and the particle size range is 0.3-17.5 μm; in step three, artificial graphite particles are obtained after graphitization , the average particle size is 4.6 μm, the particle size distribution range is 0.3-17.0 μm, and the discharge capacity is ≥330mAh / g; the preparation process has not undergone step four classification treatment. The obtained artificial graphite negative electrode material for lithium-ion batteries is a single particle with an average particle diameter of 5.0 μm and a particle size distribution range of 0.5-18.5 μm, including graphite and a hard carbon layer uniformly coated outside the graphite, the carbon The thickness of the layer is 2-25 nm.

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Abstract

The invention provides a graphite negative electrode material, preparation and application thereof. The graphite negative electrode material is particles with an average particle size of 5.0-9.0 [mu]m, wherein the particles comprise graphite and a carbon layer coated outside the graphite, and the thickness of the carbon layer is 5-100 nm. The graphite negative electrode material has relatively good high-rate discharge performance.

Description

technical field [0001] The invention belongs to the field of preparation of negative electrode materials for lithium batteries of hybrid electric passenger cars, and in particular relates to a graphite negative electrode material and its preparation and application. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, no memory effect, high working voltage, small self-discharge, long cycle life and environmental protection, and are widely used in many fields such as electric vehicles, portable electronic devices, and energy storage devices. Among them, the lithium-ion battery used for the starting power of the car has high requirements for the battery and material rate performance, and it is required to be able to achieve 5C to 10C charge and discharge. [0003] The main components that make up a lithium-ion battery are the positive electrode, the negative electrode, the electrolyte, the separator, etc., and the negative electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCY02E60/10
Inventor 陈跃丁晓阳吴志红苗荣荣朱丽萍
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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