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Preparation method for purifying resistance material artificial graphite pore-forming negative electrode material by acid pickling method and material

A technology of artificial graphite and negative electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of increased active specific surface area, battery short circuit, and short battery life, and achieve improved material volume expansion, improved material volume expansion, and The effect of improving charge and discharge performance

Inactive Publication Date: 2018-12-21
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the industry, this kind of resistance material is mechanically crushed to the micron level, and then subjected to simple shape treatment, demagnetization, and then used as a type of negative electrode material. It is applied in the field of low-end negative electrode materials. When it is used in batteries, there is a short circuit in the battery, and the risk of self-discharge is very high. The multiple increases, these active sites react violently with the electrolyte during the charging and discharging process, and will continue to consume and decompose the electrolyte battery to produce gas swelling, which seriously affects the cycle storage performance and safety performance, causing the battery to spontaneously ignite, explode, etc., and the battery life is short. high application cost
[0003] In view of this, it is necessary to provide and develop a kind of preparation method and material thereof for the pickling method of purifying resistance material, artificial graphite, and hole-making negative electrode material that solve problems such as battery short circuit and self-discharge caused by graphitization impurities and ash content.

Method used

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  • Preparation method for purifying resistance material artificial graphite pore-forming negative electrode material by acid pickling method and material
  • Preparation method for purifying resistance material artificial graphite pore-forming negative electrode material by acid pickling method and material
  • Preparation method for purifying resistance material artificial graphite pore-forming negative electrode material by acid pickling method and material

Examples

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Effect test

Embodiment 1

[0030] Example 1: A method of purifying resistance material artificial graphite pore-forming negative electrode material by pickling method provided in this example: pulverize block resistance material and micronize it to 10-50 μm to obtain resistance powder, and destroy the raw material interlayer in advance , to expose the impurities in the interlayer; add the resistance powder and hydrofluoric acid solution to the reaction tank for soaking, heat to 60°C, stir at a frequency of 5r / min, react with the heated hydrofluoric acid solution for 8h, and then add the hydrofluoric acid solution The acid solution is separated from the resistance powder; the separated resistance powder is dried under the protection of an inert gas at a temperature of 800°C to make the carbon content reach 98%; after that, the dried material is dispersed, and the dispersed powder is Composite with the modifier at a ratio of 99:1 by mass and number, high-speed fusion and dispersion, and heat to 300°C at th...

Embodiment 2

[0032] Example 2: A method for purifying resistance material artificial graphite pore-forming negative electrode material by pickling method provided in this example: pulverize the block resistance material and micronize it to 10-50 μm to obtain resistance powder, and destroy the raw material interlayer in advance , to expose the impurities in the interlayer; add the resistance powder and hydrofluoric acid solution to the reaction tank for soaking, heat to 80°C, stir at a frequency of 20r / min, react with the heated hydrofluoric acid solution for 12h, and then add the hydrofluoric acid solution The acid solution is separated from the resistance powder; the separated resistance powder is dried at 1000°C under the protection of an inert gas to make the carbon content reach 98%-99.99%; after that, the dried material is dispersed, and the The dispersing powder and the modifier are compounded according to the mass-number ratio of 99:15, fused and dispersed at a high speed, and heated...

Embodiment 3

[0034] Example 3: A method for purifying resistance material artificial graphite pore-forming negative electrode material by pickling method provided in this example: pulverize block resistance material and micronize it to 10-50 μm to obtain resistance powder, and destroy the raw material interlayer in advance , to expose the impurities in the interlayer; add the resistance powder and hydrofluoric acid solution to the reaction tank for soaking, heat to 100°C, stir at a frequency of 40r / min, react with the heated hydrofluoric acid solution for 12h, and then add the hydrofluoric acid solution The acid solution is separated from the resistance powder; the separated resistance powder is dried under the protection of an inert gas at a temperature of 1300°C to make the carbon content reach 98%-99.99%; after that, the dried material is dispersed, and the The dispersing powder and the modifier are compounded at a ratio of 99:10 in parts by mass, fused and dispersed at a high speed, and...

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Abstract

The invention discloses a preparation method for purifying resistance material artificial graphite pore-forming negative electrode material by acid pickling method, including steps of pulverizing andmicronizing block resistance material, adding resistance powder and acid solution into a reaction tank, soaking, heating, stirring, separating, drying at high temperature, dispersing, compounding dispersed powder and modifier according to mass fraction ratio of 99: 1 to 99: 15, high-speed fusing and dispersing, heating, fully dispersing and then carbonization at 800 to 1300 degree centigrade, repairing crushed powders surface to form core-shell structure, and then mixing and dispersing at low speed to obtain artificial graphite pore-forming cathode material after sieving. The invention thoroughly removes impurities in the material, The purity of the raw material is greatly improved, and some hidden dangers such as short circuit, self-discharge, bulging and the like caused by the impurityfactors of the material in the application are solved, and the porous structure is formed, which improves the rate charge-discharge performance of the material and the volume expansion of the material.

Description

technical field [0001] The invention relates to the technical field of artificial graphite negative electrode materials for lithium-ion batteries, in particular to a preparation method and materials for the artificial graphite hole-making negative electrode materials of resistance materials purified by pickling. Background technique [0002] The lithium battery energy industry has developed rapidly in recent years, and lithium battery related industries have also developed rapidly at the same time. Among them, the demand for graphite anode materials is also increasing, and one of the important links in the preparation process of graphite anode material precursors is graphitization. During the bulk graphitization process, along with the product processing, the resistance material in the furnace will also be graphitized simultaneously. However, since this type of material functions as a resistance material during the graphitization process, it generally has a low degree of grap...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 晏荦彭飞仰韻霖
Owner DONGGUAN KAIJIN NEW ENERGY TECH