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Method for preparing high-capacity artificial graphite negative electrode material by catalytic graphitization of bulk semi-closed cells

An artificial graphite negative electrode and graphitization technology, applied in chemical instruments and methods, negative electrodes, inorganic chemistry, etc., can solve the problem of uneven catalytic effect, achieve good catalytic effect, good catalytic uniformity, and achieve the effect of mass production

Active Publication Date: 2021-01-01
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the existing catalytic graphitization technology, there is a problem of inhomogeneous catalytic effect caused by catalyst escape at high temperature and uneven catalyst distribution. In order to solve this problem, the present invention provides a block semi-closed pore catalytic graphitization to prepare high-capacity Method for Artificial Graphite Negative Electrode Material

Method used

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  • Method for preparing high-capacity artificial graphite negative electrode material by catalytic graphitization of bulk semi-closed cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Mix 8 μm silicon carbide and polypropylene evenly at a mass ratio of 1:2, heat to 150°C while stirring under a nitrogen atmosphere, and spray dry after stirring to obtain a catalyst / pore-forming agent composite with a particle size of 10 μm.

[0053] (2) Mix 8 μm pitch coke with catalyst / pore former compound and coal tar pitch according to the ratio of 10:0.5:1.

[0054] (3) Isostatic pressing: the mixed material is placed in a rubber mold, and isostatically pressed under a pressure of 200 MPa, and the holding time is 2 hours.

[0055] (4) Carbonization: Under a nitrogen atmosphere, the isostatically pressed block material was heated to 750°C at a heating rate of 2°C / min, and a carbon block containing micron-sized pores was obtained after natural cooling.

[0056] (5) Catalytic graphitization: Catalytic graphitization is carried out in a conventional Acheson furnace, the maximum temperature of graphitization is 3000°C, and the temperature is kept for 24 hours.

[0...

Embodiment 2

[0059] (1) Mix 8 μm elemental silicon and polyethylene at a mass ratio of 1:2, heat to 130°C while stirring under a nitrogen atmosphere, and spray dry after stirring to obtain a catalyst / pore-forming agent composite with a particle size of 10 μm.

[0060] (2) Mix 8 μm petroleum coke with catalyst / pore-forming agent compound and coal tar pitch according to the ratio of 10:0.3:0.8.

[0061] (3) Isostatic pressing: the mixed material is placed in a rubber mold, and isostatically pressed under a pressure of 150 MPa, and the holding time is 3 hours.

[0062] (4) Carbonization: Under a nitrogen atmosphere, the isostatically pressed block was heated to 700°C at a heating rate of 1°C / min, and a carbon block containing micron-sized pores was obtained after natural cooling.

[0063] (5) Catalytic graphitization: Catalytic graphitization is carried out in a conventional Acheson furnace, the maximum temperature of graphitization is 3000°C, and the temperature is kept for 24 hours.

[006...

Embodiment 3

[0066] (1) Mix 8 μm silica and polystyrene evenly at a mass ratio of 1:0.5, heat to 180°C while stirring under a nitrogen atmosphere, and spray dry after stirring to obtain a catalyst / pore-forming agent composite with a particle size of 15 μm .

[0067] (2) Mix 5 μm petroleum coke with catalyst / pore-forming agent compound and coal tar pitch according to the ratio of 10:1:1.5.

[0068] (3) Isostatic pressing: the mixed material is placed in a rubber mold, and isostatically pressed under a pressure of 250MPa, and the holding time is 1h.

[0069] (4) Carbonization: In a helium atmosphere, the isostatically pressed block material was heated to 850°C at a heating rate of 5°C / min, and a carbon block containing micron-sized pores was obtained after natural cooling.

[0070] (5) Catalytic graphitization: Catalytic graphitization is carried out in a conventional Acheson furnace, the maximum temperature of graphitization is 3000°C, and the temperature is kept for 24 hours.

[0071] (6...

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Abstract

The invention discloses a method for preparing a high-capacity synthetic graphite negative electrode material. The method comprises the following steps: firstly mixing a silicon catalyst with a pore former to manufacture a catalyst and pore former compound, then uniformly mixing coke with the catalyst and pore former compound and an adhesive to form a mixture, then manufacturing the mixture into blocks through isostatic pressing, then carrying out heating carbonization, then putting the blocks into an Acheson furnace for catalytic graphitization, and finally carrying out crushing, grading, magnetism removal and sieving to obtain the high-capacity synthetic graphite negative electrode material. The method solves the problem that the catalytic effect is non-uniform caused by the facts that the catalyst is escaped at high temperature and the distribution of the catalyst is non-uniform existing in an existing catalytic graphitization technology.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a high-capacity artificial graphite negative electrode material and a preparation process for its block semi-closed pore catalytic graphitization. Background technique [0002] Lithium-ion batteries occupy a dominant position in electric vehicle batteries. As people's requirements for the driving range of electric vehicles increase, the development of high-capacity power lithium-ion batteries has become a top priority. [0003] At present, the most commonly used anode materials for lithium-ion batteries are graphite materials, including natural graphite anode materials and artificial graphite anode materials. Natural graphite anode materials have the characteristics of high capacity and high compaction, but their cycle performance is poor, and there is cycle diving. risk, so it is rarely used in power lithium-ion batteries. Artifici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M10/0525H01M4/02C01B32/205
CPCC01B32/205H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 石磊王志勇邵浩明皮涛黄越华余梦泽
Owner HUNAN SHINZOOM TECH
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