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Carbon/carbon composite microsphere material, production method and lithium ion battery

A technology of lithium-ion batteries and production methods, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of poor sphericity of materials, complicated preparation process, and harsh process conditions, etc. Achieve the effect of enhancing the compression resistance, reducing the specific surface area and good compatibility

Active Publication Date: 2013-07-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The methods reported above generally have problems such as poor sphericity of materials, high cost of raw materials, complicated preparation process, high equipment requirements, harsh process conditions, serious pollution, and difficulties in mass production.

Method used

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  • Carbon/carbon composite microsphere material, production method and lithium ion battery
  • Carbon/carbon composite microsphere material, production method and lithium ion battery
  • Carbon/carbon composite microsphere material, production method and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Mix 5 grams of crushed petroleum coke, 10 grams of gas black, 5 grams of glucose and 150 grams of water, and stir at 50°C for 4 hours to prepare a slurry. The slurry is dried and granulated by a spray dryer, the spray drying inlet temperature is 230°C, and the outlet temperature is 70°C; after drying, initial carbon / carbon composite microspheres can be obtained. Then, the obtained material was heat-treated in a fixed bed at 900° C. for 2 h under the protection of an argon atmosphere to obtain a carbon / carbon composite microsphere material.

[0061] The carbon / carbon composite microsphere material prepared above was observed with a JSM-7001F field emission scanning electron microscope produced by JEOL Oxford Instruments.

[0062] figure 1 It is the SEM image of the carbon / carbon composite microsphere material obtained in Example 1. The material has a high degree of sphericity.

[0063] The carbon / carbon composite microspheres prepared above were analyzed for particle ...

Embodiment 2

[0067] Mix 7 grams of crushed oil-based needle coke, 3 grams of gas black, 5 grams of wheat starch and 120 grams of water, and stir at 40°C for 2 hours to prepare a slurry. The slurry is dried and granulated by a spray dryer, the spray drying inlet temperature is 230°C, and the outlet temperature is 150°C; after drying, initial carbon / carbon composite microspheres can be obtained. Then, the obtained material was heat-treated in a fluidized bed at 1400° C. for 5 h under the protection of a nitrogen atmosphere to obtain a carbon / carbon composite microsphere material. After particle size analysis, the particle size of carbon / carbon composite microspheres is between 2-60 μm; the electrochemical performance test results are shown in Table 1.

Embodiment 3

[0069]Mix 15 grams of crushed coal-based needle coke, 15 grams of cellulose, 10 grams of furnace black, 5 grams of channel black and 300 grams of water, and stir at 30°C for 1.5 hours to prepare a slurry. The slurry is dried and granulated by a spray dryer, the spray drying inlet temperature is 200°C, and the outlet temperature is 100°C; after drying, initial carbon / carbon composite microspheres can be obtained. Then, the obtained material was heat-treated in a stirred bed at 800° C. for 3 h under the protection of a nitrogen atmosphere to obtain a carbon / carbon composite microsphere material. After particle size analysis, the particle size of carbon / carbon composite microspheres is between 10 and 80 μm; the electrochemical performance test results are shown in Table 1.

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Abstract

The invention relates to a carbon / carbon composite microsphere material, a production method and a lithium ion battery. The carbon / carbon composite microsphere material is prepared through the following steps of: grinding petroleum coke, needle coke or other soft carbon materials into particles which are less than 2 microns in granularity, and mixing the particles with a binding agent, carbon black and a solvent by a certain proportion to obtain a slurry; carrying out spray-balling and drying to obtain an initial composite microsphere, and implementing heat treatment in the atmosphere of an inert gas to obtain the carbon / carbon composite microsphere material. The carbon / carbon composite microsphere material disclosed by the invention has a good sphericity degree and a proper microporous channel, the microsphere material, serving as a negative electrode material of a lithium ion battery, is well compatible with an electrolyte solution, and simultaneously, the microsphere material has a relatively high specific capacity and an excellent circulating performance. The preparation process is environmental-friendly, simple in process, low in cost and easy for industrial promotion.

Description

technical field [0001] The invention relates to a lithium battery negative electrode material and a preparation method thereof, more specifically, the present invention relates to a carbon / carbon composite microsphere material, a production method and a lithium battery using the carbon / carbon composite microsphere material as a negative electrode material An ion battery belongs to the technical field of negative electrode materials for lithium ion batteries. Background technique [0002] Lithium-ion battery is a chemical power source that can meet the wide use and high-speed development needs of various portable electronic devices, electric tools and new energy electric vehicles. It has the advantages of high voltage, large specific energy, stable discharge voltage, good low temperature performance, excellent safety performance, easy storage and long working life. The preparation of negative electrode materials is one of the key technologies for lithium-ion batteries. Grap...

Claims

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Application Information

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IPC IPC(8): C04B35/52C04B35/622H01M4/587H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 苏发兵张美菊王艳红张在磊翟世辉
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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