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Lithium ion battery carbon microsphere negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of spherical carbon materials such as poor sphericity, difficulty in achieving sufficient fineness, and cumbersome preparation process, etc., to achieve increased strength, Improved rate performance and simple preparation process

Active Publication Date: 2015-07-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The disadvantages of the preparation method are that the preparation process is complicated, the equipment is complicated, the pollution is relatively large, and the energy consumption and cost are relatively high.
In the prior art, if graphite powder or petroleum coke is used as a raw material, it is difficult to achieve sufficient fineness, and the obtained spherical carbon material has poor sphericity and low tap density; if the raw material used is a carbon-containing polymer (such as phenolic resin), the cost of raw materials is higher

Method used

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  • Lithium ion battery carbon microsphere negative electrode material and preparation method thereof
  • Lithium ion battery carbon microsphere negative electrode material and preparation method thereof
  • Lithium ion battery carbon microsphere negative electrode material and preparation method thereof

Examples

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Embodiment 1

[0059] A preparation method of carbon microsphere negative electrode material for lithium ion battery:

[0060] (1) Mix 5 grams of carbon black, 5 grams of wheat starch and 200 grams of water, and stir at 50°C for 4 hours to obtain a slurry;

[0061] (2) The slurry obtained in step (1) is dried and formed through the process of spray drying into balls. The spray drying inlet temperature is 230°C, and the outlet temperature is 70~150°C; after drying, initial carbon microspheres can be obtained ;

[0062] (3) The initial carbon microspheres obtained in step (2) were subjected to a high-temperature treatment at 900° C. for 2 h under an argon atmosphere to obtain a carbon microsphere negative electrode material.

[0063] The carbon microsphere material prepared in Example 1 was used to observe the surface morphology of the carbon microsphere with a JSM6700 type field emission scanning electron microscope (Japan Electronics Co., Ltd.). figure 1 For the SEM figure of the carbon mi...

Embodiment 2

[0068] A preparation method of carbon microsphere negative electrode material for lithium ion battery:

[0069] (1) Mix 5 grams of carbon black, 2.5 grams of glucose and 100 grams of water, and stir at 30°C for 2 hours to obtain a slurry;

[0070] (2) The slurry obtained in step (1) is dried and formed through the spray drying process, and the spray drying inlet temperature is 250°C, and the outlet temperature is 70-150°C; after drying, the initial carbon microspheres can be obtained ;

[0071] (3) The initial carbon microspheres obtained in step (2) were subjected to a high-temperature treatment at 1300° C. for 5 h under a nitrogen atmosphere to obtain a carbon microsphere anode material.

[0072] Figure 4 For the SEM figure of the carbon microsphere negative electrode material that embodiment 2 obtains, by Figure 4 It can be seen that the sphericity of the carbon microsphere particles is good. The particle size of the carbon microspheres was analyzed by a particle size...

Embodiment 3

[0074] A preparation method of carbon microsphere negative electrode material for lithium ion battery:

[0075] (1) Mix 5 grams of carbon black, 3 grams of cellulose and 80 grams of water, and stir at 40°C for 3 hours to obtain a slurry;

[0076] (2) The slurry obtained in step (1) is dried and formed through the process of spray drying into balls. The spray drying inlet temperature is 300°C, and the outlet temperature is 70-150°C; after drying, initial carbon microspheres can be obtained ;

[0077] (3) The initial carbon microspheres obtained in step (2) were subjected to a high-temperature treatment at 900° C. for 5 h under a nitrogen atmosphere to obtain a carbon microsphere anode material.

[0078] Figure 5 It is the SEM image of the carbon microsphere negative electrode material obtained in Example 3. The carbon microsphere particles have good sphericity, and the particle size analysis shows that the carbon microsphere particle size is between 1 and 40 microns; the ele...

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Abstract

The invention relates to a preparation method of a lithium ion battery carbon microsphere negative electrode material. The method comprises: mixing carbon black, a binder and a solvent to prepare a slurry, conducting spray drying for molding, and then carrying out a high temperature treatment so as to obtain the lithium ion battery carbon microsphere negative electrode material. The lithium ion battery carbon microsphere negative electrode material provided in the invention has a high degree of sphericity and a controllable particle size, so that close packing of the negative electrode material is realized, the volume energy density of electrodes is enhanced. Meanwhile, lithium ions can be embedded from all directions, and the structural stability, the rate capability and the first coulombic efficiency of the material are improved. The carbon microspheres internally have size-controllable gaps, which make up a plurality of ion transport channels, thus being conducive to improving the charge-discharge capacity and cyclic capacity retention rate of the material. Also, the main preparation raw material is carbon black, which has wide sources, no need for breaking, and a low price. And the preparation method has the advantages of simple process, environmental friendliness, low energy consumption and cost, and is easy for large scale production.

Description

technical field [0001] The invention relates to a lithium battery negative electrode material and a preparation method thereof. More specifically, the invention relates to a lithium ion battery carbon microsphere negative electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] Lithium-ion battery refers to a secondary battery system that uses two different lithium intercalation compounds that can reversibly intercalate and deintercalate lithium ions as the positive and negative electrodes of the battery, respectively. When charging, lithium ions are deintercalated from the positive electrode, passed through the electrolyte and separator, and inserted into the negative electrode; on the contrary, lithium ions are deintercalated from the negative electrode, passed through the electrolyte and separator, and inserted into the positive electrode. [0003] Lithium-ion b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 苏发兵张美菊王艳红翟世辉
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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