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Preparation method of natural microcrystalline graphite negative electrode material, negative electrode material and application

A technology of natural microcrystalline graphite and negative electrode materials, which is applied in the field of lithium-ion batteries, can solve problems that do not involve the use of catalysts, and achieve the effects of improving oxidation resistance, reducing production costs, and good rate performance

Active Publication Date: 2020-05-08
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The intercalation treatment is mainly realized through the oxidation of graphite and strong oxides, but it does not involve the use of catalysts

Method used

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  • Preparation method of natural microcrystalline graphite negative electrode material, negative electrode material and application
  • Preparation method of natural microcrystalline graphite negative electrode material, negative electrode material and application
  • Preparation method of natural microcrystalline graphite negative electrode material, negative electrode material and application

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[0051] refer to figure 1 , the present invention provides a method for preparing a natural microcrystalline graphite negative electrode material and the obtained microcrystalline graphite negative electrode material. The method uses natural microcrystalline graphite ore as a raw material, through airflow crushing, lye high-temperature reflux stirring, and acid liquid high-temperature reflux stirring , high-temperature graphitization treatment and other steps to obtain powder materials, which can be used as raw materials for lithium-ion battery negative electrode materials.

[0052] Specifically, the preparation method of the natural microcrystalline graphite negative electrode material provided by the invention comprises the following steps:

[0053] S1, crushing treatment: crush the natural microcrystalline graphite ore to obtain microcrystalline graphite secondary particles; generally use natural microcrystalline graphite ore with a fixed carbon content of 70-85%;

[0054] ...

Embodiment 1

[0071] refer to figure 1 , the present embodiment provides a low-cost natural microcrystalline graphite negative electrode material preparation method, comprising the following steps:

[0072] S1. Pulverization treatment: add the microcrystalline graphite ore into the jet pulverizer for jet pulverization, the pulverization pressure is 0.1-1.0Mpa, and at the same time complete pulverization, classification to remove fine powder and bottom particles, sieve, and magnetic separation to obtain a fixed carbon content of 70%. ~85% microcrystalline graphite secondary particles, the microcrystalline graphite secondary particles are accumulated by primary particles with a particle size of about 1 μm;

[0073] S2. Alkali treatment: Mix the microcrystalline graphite secondary particles treated in S1 with sodium hydroxide solution at a solid-to-liquid mass ratio of 5:1, the concentration of the sodium hydroxide solution is 1.0mol / L, and the mixing operation is performed on the belt liner ...

Embodiment 2

[0078] refer to figure 1 , the present embodiment provides a low-cost natural microcrystalline graphite negative electrode material preparation method, comprising the following steps:

[0079] S1. Pulverization treatment: add the microcrystalline graphite ore into the jet pulverizer for jet pulverization, the pulverization pressure is 0.1-1.0Mpa, and at the same time complete pulverization, classification to remove fine powder and bottom particles, sieve, and magnetic separation to obtain a fixed carbon content of 70%. ~85% microcrystalline graphite secondary particles, the microcrystalline graphite secondary particles are formed by the accumulation of primary particles with a particle size of about 1 μm;

[0080] S2. Alkali treatment: Mix the microcrystalline graphite secondary particles treated in S1 with sodium hydroxide solution at a solid-to-liquid mass ratio of 5:1, the concentration of the sodium hydroxide solution is 1.0mol / L, and the mixing operation is performed on t...

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Abstract

The invention relates to a preparation method of a natural microcrystalline graphite negative electrode material, the negative electrode material and application, the preparation method comprises thefollowing steps: S1, crushing microcrystalline graphite ore to obtain microcrystalline graphite secondary particles; s2, performing alkali processing to obtain alkali-leached graphite; s3, performingstrong oxidizing acid processing to obtain acid-leached graphite; s4, introducing a catalyst, and performing high-temperature graphitization processing to obtain the microcrystalline graphite negativeelectrode material; wherein the catalyst is a co-catalyst composed of a transition metal oxide and magnesium oxide, the transition metal oxide is a main catalyst, the magnesium oxide is a catalyst promoter, and the weight ratio of the main catalyst to the catalyst promoter is 3: 1. The invention also provides the microcrystalline graphite negative electrode material prepared by the preparation method and the application of the microcrystalline graphite negative electrode material in a lithium ion battery. The negative electrode material prepared by the method is formed by stacking primary particles with the particle size D50 of 1 mu m, the graphitization degree is 90% or above, the carbon content is 99.9% or above, and the negative electrode material has relatively large interlayer spacing and high gram capacity and can be used as the negative electrode material of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a low-cost natural microcrystalline graphite negative electrode material. [0002] technical background [0003] my country is a big country of graphite ore. Natural graphite includes flake graphite (crystalline graphite) and microcrystalline graphite (or earthy graphite). At present, the purification methods of the two types of graphite mainly include flotation method, hydrofluoric acid method and acid-base method: [0004] (1) Flotation is a commonly used purification method for graphite raw ore. The commonly used collectors are kerosene, heavy oil, etc., the foaming agent is terpineol oil, ether alcohol, etc., the regulator is lime and sodium carbonate, and the inhibitor is water glass. and lime. For the flotation method, it is suitable for preliminary purification, and its quality can only reach a certain range, and some impurities are dif...

Claims

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Application Information

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IPC IPC(8): C01B32/21H01M4/587H01M10/0525
CPCC01B32/21H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 周奇周晓航娄忠良
Owner 桑顿新能源科技(长沙)有限公司
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