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Preparation method of natural flake graphite-based negative electrode material

A technology of natural flake graphite and negative electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of not meeting the all-round needs of lithium batteries, difficult to guarantee the integrity of particle coating, and dependent on selection. Beneficial for fabrication and coating, improved electrochemical performance, improved affinity

Active Publication Date: 2016-09-21
内蒙古丰辉新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems in the method of coating natural graphite flakes with precursors such as resin or pitch alone are: 1) particle bonding causes agglomeration and reduces yield; 2) particle coating integrity is difficult to guarantee, and product consistency is poor; 3) A single carbon, including carbon quality and pore structure, is dependent on the choice of electrolyte and cannot meet the all-round needs of the lithium battery market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) The LG (-) 150-94 natural flake graphite is circularly pulverized in a cyclone vortex pulverizer. After pulverization, the particle size D50 is 18 microns, and the tap density is 0.75g / cm 3 , The yield is 75%. Then carry out acid purification until the fixed carbon content is 99.95% and dry, the yield rate is 91.5%; then infiltrate 10% ethanol solution of thermosetting phenolic resin under vacuum condition, the mass ratio of graphite and phenolic resin is 100:10, graphite and phenolic resin The mass ratio of the solution is 100:60, and finally the used solvent is evaporated in vacuum; the obtained graphite is pre-carbonized under the protection of nitrogen at 550°C. The yield rate is 95%. Among them, the phenolic resin solution is a solution added with 4% phosphoric acid and 0.5% urea hydrogen peroxide, that is, the mass ratio of phenolic resin to 85% industrial phosphoric acid is 100:4, and the mass ratio of graphite to urea hydrogen peroxide is 100:0.5 .

[0029...

Embodiment 2

[0032] The pre-carbonized graphite obtained in step 1) of Example 1 is added to the pitch coke powder and mixed, the steps are the same as in Example 1, and the pitch coke powder is prepared by mixing coal tar pitch and petroleum coke. The comprehensive finished product rate of the product is 47.5%, among which, about 33% tailings loss occurs during the crushing process.

Embodiment 3

[0034] The pre-carbonized graphite obtained in step 1) of Example 1 is added to the pitch coke powder and mixed, the steps are the same as in Example 1, and the pitch coke powder is prepared by mixing coal tar pitch and needle coke. The comprehensive yield of the product is 48.7%, of which, about 32% of the tailings are lost during the crushing process.

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Abstract

The invention discloses a preparation method of a natural flake graphite-based negative electrode material. The method specifically comprises the following steps of: (1) crushing and processing natural flake graphite, carrying out purifying and drying, then infiltrating the product with a phenolic resin solution, finally evaporating the used solvent, and carrying out pre-carbonization on the obtained graphite under nitrogen protection of 550-750 DEG C; (2) adding the pre-carbonized graphite obtained in the step (1) to pitch coke micro powder for mixing, carrying out shaping and crushing until the tap density is 0.95-1.00g / cm<3>, adding the crushed graphite to dimethicone for mixing, carrying out pre-carbonization under nitrogen protection of 550-750 DEG C and carrying out sieving and magnetic deironing; and (3) carrying out carbonization treatment on the pre-carbonized graphite obtained in the step (2) under nitrogen protection of 950-1250 DEG C to obtain the natural flake graphite-based negative electrode material. The negative electrode material is high in yield, good in material liquid absorption and holdup properties and good in electrochemical properties.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium batteries, in particular to a method for preparing a natural flake graphite-based negative electrode material and the negative electrode material prepared by the method. Background technique [0002] Natural flake graphite lithium battery anode material has a high capacity, which is about 10-20% higher than ordinary carbon materials; the cost of manufacturing anode materials is low, because it is an ideal graphite crystal structure, no high-temperature graphitization process is required; natural flake graphite is my country's dominant mine The reserves account for about 70% of the world's total; the processing technology of natural flake graphite is mature, and the processing lines are all independently manufactured. At present, carbon materials are the leading materials for lithium battery anode materials. For a long period of development, carbon materials are indi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62
CPCH01M4/587H01M4/62H01M4/625Y02E60/10
Inventor 傅云峰
Owner 内蒙古丰辉新材料科技有限公司
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