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Production method of spheroidized graphite with low specific surface area

A production method and specific surface technology, applied in the direction of electrochemical generators, active material electrodes, electrical components, etc., can solve the problems of specific surface area and tap density contradiction, and achieve the effect of reducing the number of processing times and reducing electricity costs

Active Publication Date: 2022-03-15
萝北奥星新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the production process of the precursor of natural graphite negative electrode material - spheroidized graphite, the specific surface area and the tap density are a pair of contradictions, and the two cannot have both

Method used

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  • Production method of spheroidized graphite with low specific surface area
  • Production method of spheroidized graphite with low specific surface area
  • Production method of spheroidized graphite with low specific surface area

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Experimental program
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Effect test

Embodiment 1

[0026] The production specification is SG17-0.96 spheroidized graphite, the quality index is D10: 10.4∽11.0μm, D50: 17.7∽18.6μm, D90≤31.0μm, Tap≥0.96g / cm 3 Specific surface area: 5.0∽6.0m 2 / g. The method in the patent of the present invention is used for production. The clockwise and counterclockwise rotation directions of the main engine 1 of the jet mill are 1:1 according to the processing times. For example, the 1st, 3rd, 5th, 7th, and 9th processing times are clockwise. Rotation, the 2nd, 4th, 6th, 8th, 10th processing times are counterclockwise rotation. Take flake graphite with a specification of -194, which is produced in Jixi Liumao Mine, put 500 kg of this batch of flake graphite into a 60-type steam pulverizer (the 60-type steam pulverizer is not equipped with an external classifier 3), and set the parameter as the main engine speed 45Hz, the speed of the fan is 35Hz, the speed of the internal classifier is 6Hz, the first stage of crushing is crushed once to D50 =...

Embodiment 2

[0033] The production specification is SG10-L spheroidized graphite, the quality index is D10=7.0±0.4μm, D50: 10.8~11.5μm, D90=17.5~18.8μm, Tap≥0.795g / cm 3 Specific surface area: ≤7.0m 2 / g.

[0034] The clockwise and counterclockwise rotation direction of the host grinding disc of the jet mill is 1:1 according to the processing times. Take the fine powder graphite with D50=10-14μm, the place of origin is Heilongjiang Jixiliu Wool, put 500 kg of this batch of graphite into the 50-type jet mill (both the 50-type and 30-type are equipped with an external classifier), and set the parameter as the main engine speed 45Hz, the speed of the fan is 33Hz, the speed of the internal classifier is 15Hz, after one crushing to D50=12.51μm; Mix one piece evenly, and then put it into the 50-type steam pulverizer repeatedly, set the parameters as the host speed is 35Hz, the fan speed is 30Hz, the inner classifier speed is 5Hz, the outer classifier speed is 90Hz, and the pulverizer is crushed...

Embodiment 3

[0040] The production specification is SG25-1.04 spheroidized graphite, the quality index is D10≥14μm, D50: 22∽24μm, D90≤35μm, Tap≥1.04g / cm 3 Specific surface area: 4.5∽5.2m 2 / g.

[0041] The clockwise and counterclockwise rotation direction of the host grinding disc of the jet mill is 1:1 according to the processing times. Take the -196 flake graphite produced by Haida Graphite Mine in Luobei, Heilongjiang, and put 500 kg of this batch of graphite into a Type 60 jet mill (Type 60 is not equipped with an external classifier). The speed of the classifier is 8Hz, after one crushing to D50=26.53μm; 2. Secondary crushing Collect the above-mentioned fine powder materials and micro powder materials crushed to D50=26.53μm into one piece and mix evenly, and then repeatedly put into 50 type air flow crushing In the machine, the parameters are set as the speed of the main machine is 34Hz, the speed of the fan is 31Hz, the speed of the internal classifier is 6.5Hz, and the speed of th...

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Abstract

The invention relates to a preparation method of spheroidized graphite. A low-specific-surface-area spheroidized graphite production method uses a steam flow pulverizer, and comprises the following steps: primary pulverizing: adding crystalline flake graphite into the steam flow pulverizer for primary pulverizing until the particle size D50 is 20-30 [mu] m, and rotating a pulverizing disc of a main machine clockwise; second-stage crushing: collecting the materials subjected to the first-stage crushing into one piece, uniformly mixing, repeatedly putting into a crushing machine, crushing for 2-6 times, and counterclockwise rotating a crushing disc of a main machine in the even number of times; shaping: the materials subjected to secondary crushing are collected together and mixed, then the materials are repeatedly put into a crusher with set parameters to be crushed and shaped for 8-12 times, and a main machine crushing disc rotates anticlockwise for the even number of times; and grading is conducted, specifically, the shaped coarse powder material is put into the steam flow pulverizer again to be pulverized, shaped and graded, and operation is repeated for 1-3 times till the particle size and the tap density of the generated coarse powder reach target values. The production method gives consideration to tap density and specific surface area.

Description

technical field [0001] The invention relates to the preparation of a lithium battery negative electrode material precursor, in particular to a preparation method of spheroidized graphite. Background technique [0002] The application prospect of lithium-ion batteries is getting wider and wider, especially when it is used in lithium-ion power batteries. After being widely used in electric vehicles and energy storage batteries, its market demand and consumption are increasing. According to statistics, lithium-ion batteries And its material market demand is increasing at a rate of 20-30% every year. As the market demand increases, more and more companies enter the industry, which intensifies market competition. Therefore, the pursuit of low-cost, high-quality products has become an industry The goal that all enterprises in the country are striving for. [0003] In order to reduce the cost of batteries and improve product quality, lithium battery manufacturers conduct in-depth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00H01M4/583H01M10/0525
CPCB02C21/00H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 陈瑞陈庚韩军李秀川赵苡锋高杨吴浩南高野谷鹏潘晓旭王汝
Owner 萝北奥星新材料有限公司
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