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Preparation method for graphite negative electrode of lithium ion battery

A lithium-ion battery, graphite anode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems that the material capacity, efficiency or cycle performance cannot meet the requirements of use, expensive equipment, and high production costs, and achieve industrial operability. The effect of improving the strength, capacity and efficiency, and reducing the preparation cost

Inactive Publication Date: 2013-03-20
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Patent CN1304187 discloses a composite graphite negative electrode material for lithium-ion batteries. It coats pyrolytic carbon on the surface of graphite powder and is doped with a conductive agent. The cycle performance of the material is not well reflected, and mechanical crushing is used in the process. This method is easy to destroy the structure of the coating material and affect the effect
[0008] Patent CN1549362A discloses a method for preparing a polymer coated modified graphite negative electrode with an organic system. The capacity and cycle performance of the coated modified graphite are improved, but the organic system is used in the process, which is also the reason for almost all polymer coated negative electrodes. The system used for coated modified graphite negative electrodes, the use of organic systems is not only high in cost, high in equipment requirements, unfriendly to the environment, but also very dangerous and prone to explosion
[0009] Japanese Patent Laid-Open No. 2000-106182 discloses a method of depositing a carbon layer on the surface of graphite by chemical vapor deposition (CVD). The capacity and cycle of the material are improved, but there is no cycle performance display. The equipment is expensive and the production cost is comparable. High, difficult to industrialize
[0010] From the above technologies, there are some defects in the graphite coating modification technology, or the process is complex, the equipment is expensive, the production cost is high, it is difficult to industrialize, or the material capacity, efficiency or cycle performance cannot meet the use requirements

Method used

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  • Preparation method for graphite negative electrode of lithium ion battery
  • Preparation method for graphite negative electrode of lithium ion battery
  • Preparation method for graphite negative electrode of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 70g of water-based phenolic resin (Tianjin Resin Factory 216-4#), 1330g of deionized water, fully stir and dissolve in the dispersing equipment, the temperature of the water bath is 90°C, and the stirring speed is 80Hz.

[0037] Weigh 55.6g of aluminum nitrate and 7.8g of α-type aluminum oxide with a particle size of 0.5 micron and add it to the dispersion equipment, and fully disperse at a rotating speed of 900 rpm. Dry at 150°C for 24 hours.

[0038] Put the obtained powder through a 400-mesh sieve and roast in an argon furnace. The roasting system is: 5°C / min rises to 600°C for solidification for 6 hours, then rises to 850°C for carbonization at 5°C / min, and heats it for 10h. Cool in the furnace.

[0039] Through the analysis of electron microscope photos, it can be concluded that the surface of natural graphite is covered with a layer of pyrolytic carbon and aluminum oxide, and its microscopic morphology has not changed before and after modification. figure ...

Embodiment 2

[0042] Weigh 100g of water-based phenolic resin (Tianjin Resin Factory 216-4#), 1000g of deionized water, fully stir and dissolve in the dispersing equipment, the temperature of the water bath is 40°C, and the stirring speed is 70Hz.

[0043] Weigh 13.2g of α-type aluminum oxide with a particle size of 0.5 microns and add it to the dispersing equipment. The speed is 1200 rpm to fully disperse, add 1000g of artificial graphite with a particle size of 9 microns, stir fully, impregnate and evaporate to dryness, and dry at 80°C for 24 hours. Put the obtained powder through a 200-mesh sieve and roast in an argon furnace. The roasting system is: 5°C / min rises to 550°C for solidification for 6 hours, then rises to 1050°C for carbonization at 3°C / min, and heats it for 6h. Cool in the furnace.

[0044] According to the analysis of electron microscope photos, it can be concluded that the surface of graphite is coated with a layer of pyrolytic carbon and aluminum oxide, and its microscop...

Embodiment 3

[0046] Weigh 50g of water-based phenolic resin (Tianjin Resin Factory 216-2#), 250g of deionized water, fully stir and dissolve in the dispersing equipment, the temperature of the water bath is 70°C, and the stirring speed is 120Hz.

[0047] Weigh 14.8g of aluminum chloride and add it to the dispersing equipment, rotate at 200 rpm to fully disperse and dissolve, add 1000g of natural graphite with a particle size of 7 microns, stir fully, impregnate and evaporate to dryness, and dry at 200°C for 16h. Put the obtained powder through a 500-mesh sieve and roast in a nitrogen furnace. The roasting system is: 3°C / min rises to 400°C for solidification for 8 hours, then 3°C / min rises to 950°C for carbonization, heat preservation for 8h, and then Furnace cools.

[0048] According to the analysis of electron microscope photos, it can be concluded that the surface of graphite is coated with a layer of pyrolytic carbon and aluminum oxide, and its microscopic morphology has not changed befor...

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Abstract

The invention discloses a preparation method for a high-performance modified graphite negative electrode, and in particular discloses a preparation method for a graphite negative electrode of a lithium ion battery. The preparation method mainly comprises the following steps of: conducting procedures of liquid-phase even mixing, drying, roasting, screening and the like to water-soluble phenol-formaldehyde resin, an aluminum source and graphite negative electrode material to be modified to prepare a graphite negative electrode which is modified jointly by pyrolytic carbon and aluminum oxide, wherein the surfaces of the pyrolytic carbon are coated with phenolic resin. The modified graphite negative electrode material has the characteristics of being high in reversibility specific capacity, high in first-time charging and discharging efficiency, long in recycling life and good in safety property. The modified technique is simple to operate, low in cost, and obvious in modification effect.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a method for preparing a lithium ion battery graphite negative electrode. Background technique [0002] Because lithium-ion batteries have the advantages of high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life, they have not only been widely used in mobile phones, notebook computers, video cameras, digital cameras, etc. and other civilian and military fields, and is expected to be expanded in electric vehicles, aerospace and energy storage. [0003] In recent years, due to the continuous improvement of the performance of mobile devices and communication equipment, higher requirements have been put forward for the energy density, cycle life, high and low temperature performance and safety of lithium-ion batteries. The performance is directly related, and the performance of the negative electrode material is direc...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/62
CPCY02E60/122Y02E60/10
Inventor 徐宁吕菲程晓焜吴孟涛
Owner TIANJIN B&M SCI & TECH
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