Production method of interphase carbon-coated graphite negative electrode material

A graphite negative electrode, mesophase carbon technology, applied in graphite, chemical instruments and methods, battery electrodes, etc., can solve the problems of poor electrolyte compatibility, short cycle life, poor conductivity, etc., to improve electrochemical performance, The effect of safe processing and uniform conductivity

Active Publication Date: 2014-08-20
大连宏光锂业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a production method of mesophase carbon-coated graphite negative electrode material, to overcome natural defects such as low capacity, poor conductivity, short cycle life, and poor compatibility with electrolytes that exist in natural graphite or artificial graphite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 8000g of natural graphite raw material A, graphitize at 2800°C, and sieve after cooling.

[0024] The mesophase carbon microspheres are pulverized into particles of ≤80nm, which are used as raw material B for later use.

[0025] Weigh 5000 g of natural graphite material A after sieving treatment, add 200 g of mesophase carbon microsphere raw material B, and carry out airflow mixing at room temperature for 1 hour.

[0026] Weigh 5000g of the mixture of raw materials A and B, add 300g of asphalt raw material C, carry out airflow mixing at room temperature for 30 minutes, then use a reactor to stir and mix at 300°C for 1 hour, then raise the temperature to 600°C and stir and mix for 2 hours.

[0027] After the above-mentioned mixture of A+B+C is cooled, weigh 5000g of the mixture of raw materials A+B+C, put it into a graphite crucible, carry out carbonization treatment at 1300°C, and finally carry out post-processing to obtain the product.

[0028] The LIR2430 butto...

Embodiment 2

[0030] Weigh 8000g of artificial graphite raw material A, carbonize at 1400°C, and sieve after cooling.

[0031] The mesophase carbon microspheres are pulverized into particles of ≤80nm, which are used as raw material B for later use.

[0032] Weigh 5000 g of artificial graphite material A after sieving treatment, add 250 g of mesophase carbon microsphere raw material B, and carry out airflow mixing at room temperature for 1 hour.

[0033] Weigh 5000g of the mixture of raw materials A and B, add 300g of asphalt raw material C, carry out airflow mixing at room temperature for 30min, then use a reactor to stir and mix at 300°C for 1 hour, then raise the temperature to 600°C and stir and mix for 2 hours.

[0034] After the above-mentioned mixture of A+B+C is cooled, weigh 5000g of the mixture of raw materials A+B+C, put it into a graphite crucible, carry out graphitization treatment at 3100°C, and finally carry out post-processing to obtain the product.

[0035] A LIR2430 button...

Embodiment 3

[0037] Weigh 8000g of artificial graphite raw material A, graphitize at 3100°C, and sieve after cooling.

[0038] The mesophase carbon microspheres are pulverized into particles of ≤80nm, which are used as raw material B for later use.

[0039] Weigh 5000 g of artificial graphite material A after sieving treatment, add 300 g of mesophase carbon microsphere raw material B, and carry out airflow mixing at room temperature for 1 hour.

[0040] Weigh 5000g of the mixture of raw materials A and B, add 250g of asphalt raw material C, carry out airflow mixing at room temperature for 30min, then use a reactor to stir and mix at 300°C for 1 hour, then raise the temperature to 600°C and stir and mix for 2 hours.

[0041] After the above-mentioned mixture of A+B+C is cooled, weigh 5000g of the mixture of raw materials A+B+C, put it into a graphite crucible, carry out carbonization treatment at 1300°C, and finally carry out post-treatment to obtain the product.

[0042] A LIR2430 type bu...

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Abstract

The invention provides a production method of an interphase carbon-coated graphite negative electrode material. The production method is characterized in that natural graphite or artificial graphite with median particle diameter being 10 to 30 micrometers is adopted as a raw material A, interphase carbon microspheres are adopted as a raw material B, and nano-grade micro powder asphalt is adopted as a raw material C. The raw material A is carbonized at the temperature of 1200 to 1500 DEG C or is graphitized at the temperature of 2800 to 3200 DEG C. The raw material B is crushed into nano powder with median particle diameter being less than or equal to 80nm by utilizing a nano crushing method. The raw material A and the raw material B are mixed in a ratio of 100 / (3-10) to be primarily coated and modified, the raw material C is added into the mixture of the raw material A and the raw material B according to a ratio of (A+B) / C being equal to 100 / (5-10) to be secondarily coated and modified, and finally the mixture is secondarily and thermally treated at the temperature of 1200 to 1500 DEG C or 2800 to 3200 DEG C. The production method has the advantages that the conductivity is good, the capacity is high, the cycling performance is good, the service life is long, and compatibility with electrolyte is good.

Description

technical field [0001] The invention relates to a production method of mesophase carbon-coated graphite negative electrode materials, and belongs to the technical field of lithium ion battery negative electrode materials. Background technique [0002] With the miniaturization, light weight and multi-functionalization of various electrical appliances, the market has increasingly urgent requirements for high-quality battery anode materials such as high capacity, high cycle and good processing performance. The domestic output of lithium-ion battery anode materials is about 30,000 tons. Due to the continuous expansion of the application range of lithium-ion batteries, its anode materials are also showing a trend of substantial growth. Lithium-ion batteries use reversible intercalation and delithiation carbon materials to replace traditional lithium batteries, and replace the deposition and dissolution reactions on pure lithium electrodes with the intercalation and extraction rea...

Claims

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Application Information

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IPC IPC(8): H01M4/583C01B31/02C01B32/205C01B32/21
CPCC01B32/15H01M4/366H01M4/587H01M10/0525Y02E60/10
Inventor 王丽琼叶涛蔡奉翰伍上福
Owner 大连宏光锂业有限责任公司
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