Modification method for natural graphite, modified natural graphite and application of modified natural graphite

A natural graphite and modification technology, which is applied in the modification of natural graphite, modified natural graphite and application fields, can solve the problems such as the gap in the cycle life of artificial graphite, and achieve high initial discharge capacity, simple production process, and improved reversible capacity. Effect

Pending Publication Date: 2020-02-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned methods improve the surface defects of natural graphite by coating a layer of carbon on the surface of natural graphite, which improves the cycle life to a certain extent, but there is still a certain gap compared with the cycle life of artificial graphite.

Method used

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  • Modification method for natural graphite, modified natural graphite and application of modified natural graphite
  • Modification method for natural graphite, modified natural graphite and application of modified natural graphite
  • Modification method for natural graphite, modified natural graphite and application of modified natural graphite

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Take 1000g particle size is 5.8μm, tap density is 0.68g / m 2 , the specific surface area is 8.5m 2 / g of spheroidized natural graphite was put into a muffle furnace, treated at a constant temperature of 650°C for 3 hours in an air atmosphere, and then taken out after cooling to obtain partially oxidized natural graphite. 528g of heavy oil, 85g of asphalt and 11g of phenolic resin were stirred at room temperature for 20 minutes to obtain a liquid-phase coating agent. Then mix 820g of partially oxidized natural graphite with 180g of liquid-phase coating agent for 20min, 2 Carbonized at 1150°C for 3.5h under the protection of the carbon dioxide, then graphitized at 2500°C, and modified natural graphite was obtained after cooling.

[0026] After the above-mentioned modified natural graphite is pulverized, shaped and classified, the lithium ion battery negative electrode material is obtained.

Embodiment 2

[0028] Take 1000g, the particle size is 7.5μm, and the tap density is 0.71g / m 2 , the specific surface area is 8.2m 2 / g of spheroidized natural graphite was put into a muffle furnace, treated at a constant temperature of 600°C for 2 hours in an air atmosphere, and then taken out after cooling to obtain partially oxidized natural graphite. 678g of heavy oil, 75g of asphalt and 13g of phenolic resin were stirred at room temperature for 20 minutes to obtain a liquid-phase coating agent. Then mix 800g of partially oxidized natural graphite with 150g of liquid-phase coating agent for 20min, 2 Carbonization at 900°C for 3 hours under the protection of the carbon dioxide, and then graphitization at 2600°C, and modified natural graphite was obtained after cooling.

[0029] After the above-mentioned modified natural graphite is pulverized, shaped and classified, the lithium ion battery negative electrode material is obtained.

Embodiment 3

[0031] Take 1000g, the particle size is 8.6μm, and the tap density is 0.78g / m 2 , the specific surface area is 7.5m 2 / g of spheroidized natural graphite was put into a muffle furnace, treated at a constant temperature of 800°C for 5 hours in an air atmosphere, and taken out after cooling to obtain partially oxidized natural graphite. 615g of heavy oil, 60g of asphalt and 10g of phenolic resin were stirred at room temperature for 20 minutes to obtain a liquid-phase coating agent. Then mix 800g of partially oxidized natural graphite with 120g of liquid-phase coating agent for 20min, 2 Carbonization at 1200°C for 5 hours under the protection of the carbon dioxide, and then graphitization at 2800°C, and modified natural graphite was obtained after cooling.

[0032] After the above-mentioned modified natural graphite is pulverized, shaped and classified, the lithium ion battery negative electrode material is obtained.

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Abstract

The invention discloses a modification method for natural graphite, modified natural graphite and an application of the modified natural graphite. The modification method for the natural graphite includes the following steps: S1, performing high-temperature treatment on the natural graphite in an air atmosphere to partially oxidize the natural graphite to obtain partially oxidized natural graphite; and S2, mixing the partially oxidized natural graphite and a liquid-phase coating agent, performing high-temperature carbonization treatment in an inert atmosphere, and performing graphitizing to obtain the modified natural graphite. The modified natural graphite prepared by the method has a simple production process, and a lithium ion battery anode material prepared from the modified natural graphite has the advantages of stable performance, low costs, and excellent cycle performance.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a modification method of natural graphite, modified natural graphite and its application. Background technique [0002] At present, graphite is the most commonly used material for lithium-ion battery anode materials in commercial use, mainly including artificial graphite and natural graphite. Among them, artificial graphite is the most commonly used negative electrode material in the production of commercial lithium-ion batteries in my country. It has the advantages of stable performance, high gram capacity, and good cycle performance, but the manufacturing cost is relatively high. Compared with artificial graphite, the disadvantages of natural graphite are very obvious, mainly reflected in many surface defects, poor compatibility with electrolyte, and poor cycle performance. Mainly due to the high graphite degree of natural graphit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/21H01M4/587H01M10/0525H01M4/02
CPCC01B32/21H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 王叶林少雄蔡桂凡郭盼龙毕超奇王健石永倩辛利君梁栋栋
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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