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Method for preparing carbon cathode material of lithium ion battery, carbon cathode material and lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of lack of wide applicability, limited source of raw materials, and high processing costs, and achieve excellent cycle performance and easy dispersion. Pulp, good processing performance

Active Publication Date: 2010-05-12
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Undoubtedly, the actual effect of these methods in improving or improving the compaction performance of materials is significant, but because of the long process, complicated procedures, or the limited source of raw materials and high processing costs, they are often not widely used in implementation. applicability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The selected eigenvalue is 0.91, and C W=89% The mixture of the low-temperature carbonization product of the heavy product of coal tar processing and the low-temperature carbonization product of the heavy product of petroleum processing is used as the raw material. The above-mentioned raw material is solid, and the above-mentioned solid raw material is pulverized in an air-flow pulverizing device, and the average particle diameter of the pulverized particles is about 50 μm, and the particle size distribution range is 0-160 μm. The obtained particles were thermochemically reformed for 8.0 hours at a temperature of 580° C., in a nitrogen atmosphere, and a pressure of 1.0 MPa. The thermochemical reforming step is carried out in a back-mixed fluidized bed, and the particles are in motion during the whole process of thermochemical reforming. After thermochemical reforming, the product obtained in the thermochemical reforming step is cooled to 60°C and then pulverized into m...

Embodiment 2

[0047] The selected eigenvalue is 0.91, and C W = 91% soft pitch low temperature carbonized product in coal tar processing is used as raw material. The above-mentioned raw material is solid, and the above-mentioned solid raw material is pulverized in an air-flow pulverizing device, and the average particle diameter of the pulverized particles is about 3 μm, and the particle size distribution range is 0-160 μm. The obtained particles were thermochemically reformed for 6.5 hours at a temperature of 600° C., in a nitrogen atmosphere, and a pressure of 2.0 MPa. The thermochemical reforming step is carried out in a rotating bed, and the particles are in motion during part of the thermochemical reforming. After thermochemical reforming, the product obtained in the thermochemical reforming step is cooled to 50°C and then pulverized into fine powder with mechanical pulverization equipment. The particle size of the pulverized micropowder is controlled to be about 28 μm, and the partic...

Embodiment 3

[0049] The selected eigenvalue is 0.91, and C W =91% low temperature carbonization of soft pitch in coal tar processing is used as raw material. The above-mentioned raw material is solid, and the above-mentioned solid raw material is pulverized in an air-flow pulverization equipment, and the average particle diameter of the pulverized particles is about 80 μm, and the particle size distribution range is 0-160 μm. The obtained particles were thermochemically reformed for 16.0 hours at a temperature of 720° C. in a nitrogen atmosphere and a pressure of 0.6 MPa. The thermochemical reforming step is carried out in a back-mixed fluidized bed, and the particles are in motion during the whole process of thermochemical reforming. The above-mentioned thermochemical reformation product is directly graphitized at 2800° C. to obtain the lithium ion battery carbon negative electrode material of the present invention. The lithium-ion battery made of this material is measured to have a dis...

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Abstract

The invention relates to a method for preparing a carbon cathode material of a lithium ion battery, the carbon cathode material prepared by the method and the lithium ion battery prepared from the carbon cathode material. The method for preparing the carbon cathode material of the lithium ion battery orderly comprises the steps of: (1) material selection; (2) grinding; (3) mixing-reforming; and (4) graphitization or charring and graphitization. The preparation method is based on the theory of selective catalysis possessed by iron series compounds in a process of reforming raw materials meeting the requirements of characteristic values, in complex phase reactions such as complex depolymerization, hydrogen migration, condensation and the like of heavy hydrocarbons with functional groups and during the charring or graphitization of reformates, so that the defects in internal structures of the materials are improved, the extent of ordered arrangement of material molecules is improved, and the aim of improving the compressive performance of specific cathode materials is finally achieved.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery carbon negative electrode material, a carbon negative electrode material and a lithium ion battery. Background technique [0002] As we all know, in order to manufacture a battery with a higher volumetric energy density, under the condition that the electrochemical gravimetric specific capacity of the carbon negative electrode active material is given, mechanical pressure is usually used to increase the density of the negative electrode coating during electrode sheet processing. [0003] In order to maximize the compaction effect of the negative electrode coating, two solutions are usually adopted: one is to increase the density of the negative electrode sheet by improving the external conditions such as increasing the rolling strength during the sheet rolling process. However, due to the particularity of the physical and chemical properties of the negative electrode active material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/38C01B31/02C01B31/04H01M10/36
CPCY02E60/12Y02E60/10
Inventor 胡博耿海龙郭雷
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS
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