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High-energy-density graphite composite material and preparation method thereof

A technology of high energy density and composite material, applied in the field of high energy density graphite composite material and its preparation, can solve the problems of energy density and fast charging performance cannot be taken into account at the same time, general fast charging performance, low compaction density, etc. Rate and cycle performance, improved intercalation/deintercalation rate, reduced swelling effect

Active Publication Date: 2022-04-29
惠州市禾腾能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the raw materials of graphite materials are mainly petroleum coke / needle coke. After carbonization, artificial graphite is formed and amorphous carbon is formed on its surface. It mainly has low specific capacity (≤358mAh / g) and low compaction density (≤1.7 g / cm3), low first-time efficiency (≤94%) and general fast charging performance, and the problem that energy density and fast charging performance cannot be taken into account at the same time; while metal oxides have low impedance, high specific capacity and high performance. Compatibility with the electrolyte, inertness and other characteristics, but the cycle performance is poor, which cannot meet the needs of consumers

Method used

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  • High-energy-density graphite composite material and preparation method thereof
  • High-energy-density graphite composite material and preparation method thereof
  • High-energy-density graphite composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] First, weigh 100g of epoxy resin, 20g of benzaldehyde and 5g of sulfuric acid and add them to the mixer, stir evenly, and react at a temperature of 200°C for 24 hours to obtain a cross-linked polymer; then, the The cross-linked polymer was dissolved in 1000 ml of quinoline organic solvent, stirred evenly, filtered, and vacuum-dried for 48 hours to obtain precursor material A.

[0035] Then, measure 400ml of titanium niobate solution with a concentration of 5%, add 100g of the precursor material A and 300ml of graphene conductive liquid with a concentration of 1% in the titanium niobate solution, stir evenly, spray dry, and dry Finally, carry out pre-carbonization treatment at a temperature of 500°C, cool down after carbonization for 3 hours, pulverize after the temperature drops to room temperature, raise the temperature to 1400°C after pulverization, continue carbonization for 3 hours, and pulverize to obtain the precursor coating material B.

[0036] Finally, weigh 10...

Embodiment 2

[0038] First, weigh 100g of furfural resin, 10g of paraformaldehyde and 1g of sulfuric acid and add them to the mixer, stir evenly, and react at a temperature of 150°C for 24 hours to obtain a cross-linked polymer; then, the The cross-linked polymer was dissolved in 500 ml of toluene organic solvent, stirred evenly, filtered, and dried in vacuum for 48 hours to obtain precursor material A.

[0039] Then, measure 1000ml of titanium niobate solution with a concentration of 1%, add 100g of the precursor material A and 100ml of graphene conductive liquid with a concentration of 1% in the titanium niobate solution, stir evenly, spray dry, and dry Finally, carry out pre-carbonization treatment at a temperature of 400°C, cool down after carbonization for 6 hours, pulverize after the temperature drops to room temperature, raise the temperature to 1000°C after pulverization, continue carbonization for 6 hours, and pulverize to obtain the precursor coating material B.

[0040] Finally, ...

Embodiment 3

[0042] First, weigh 100g of furfural resin, 30g of formaldehyde and 10g of sulfuric acid and add them to the mixer, stir evenly, and react at a temperature of 300°C for 24 hours to obtain a cross-linked polymer; then, the cross-linked The joint polymer was dissolved in 500 ml of N-methylpyrrolidone organic solvent, stirred evenly, filtered, and vacuum-dried for 48 hours to obtain precursor material A.

[0043]Then, measure 300ml of titanium niobate solution with a concentration of 10%, add 100g of the precursor material A and 500ml of graphene conductive liquid with a concentration of 1% in the titanium niobate solution, stir evenly, spray dry, and dry Finally, carry out pre-carbonization treatment at a temperature of 600°C, cool down after carbonization for 1h, pulverize after the temperature drops to room temperature, raise the temperature to 1600°C after pulverization, continue carbonization for 1h, and pulverize to obtain the precursor coating material B.

[0044] Finally,...

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Abstract

The invention relates to a high-energy-density graphite composite material and a preparation method thereof.The high-energy-density graphite composite material comprises an outer shell and an inner shell, the inner shell comprises graphite, the outer shell comprises titanium niobate, graphene and amorphous carbon, and the mass ratio of the outer shell to the inner shell is (1-10): (90-100). According to the high-energy-density graphite composite material prepared by the preparation method disclosed by the invention, the surface of the graphite is coated with the titanium niobate, and the characteristics of large interlayer spacing and high lithium ion conductivity of the titanium niobate are utilized, so that the intercalation / deintercalation rate of lithium ions is increased, and the cycle performance of the lithium ions is improved; in addition, a hard carbon coating layer material is obtained through a polymerization reaction, and the surface of graphite is coated with a titanium niobate and hard carbon composite material, so that the liquid retention performance can be improved, the expansion of the graphite is reduced, and the rate and the cycle performance are further improved.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion battery materials, in particular to a high energy density graphite composite material and a preparation method thereof. Background technique [0002] As the market's requirements for high-energy-density batteries and their fast-charging performance increase, the performance requirements for lithium-ion battery anode materials also increase. [0003] At present, the raw materials of graphite materials are mainly petroleum coke / needle coke. After carbonization, artificial graphite is formed and amorphous carbon is formed on its surface. It mainly has low specific capacity (≤358mAh / g) and low compaction density (≤1.7 g / cm3), low first-time efficiency (≤94%) and general fast charging performance, and the problem that energy density and fast charging performance cannot be taken into account at the same time; while metal oxides have low impedance, high specific capacity and high perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/21C01B32/205C01G33/00H01M4/36H01M4/485H01M4/62
CPCC01B32/21C01B32/205C01G33/00H01M4/625H01M4/366H01M4/485C01P2004/03C01P2006/40C01P2006/12C01P2006/11
Inventor 焦坤郑军欣余庆轩邹如亮
Owner 惠州市禾腾能源科技有限公司
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