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Porous carbon microsphere, preparation method and lithium ion battery negative electrode material

A technology of porous carbon and microspheres, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low output, complicated preparation process, and difficulty in repeating

Inactive Publication Date: 2014-01-29
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, the above-mentioned preparation method has the disadvantages of complex preparation process, low yield, difficulty in repeating and difficult to achieve large-scale preparation.

Method used

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  • Porous carbon microsphere, preparation method and lithium ion battery negative electrode material
  • Porous carbon microsphere, preparation method and lithium ion battery negative electrode material
  • Porous carbon microsphere, preparation method and lithium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Phenolic resin, hexamethylenetetramine according to the mass ratio of 50:7, phenolic resin, copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) Mix evenly according to the mass ratio of 1:4; stir the vegetable oil containing 8% span80 evenly; the ratio of organic solvent n-propanol to vegetable oil is 1:2; take 1.0g of phenolic resin, 0.14g of hexamethylene tetra Amine, 4 g of copper nitrate, measure 48 mL of vegetable oil, 3.8 mL of span80, 24 mL of n-propanol.

[0023] The mixed solid obtained above was added into 24 mL of n-propanol and mixed evenly to obtain a first mixed solution with a mass concentration of 214 g / L. The mixture was poured into 48 mL of vegetable oil containing 8% span80, stirred for 1 h, heated to 150° C., kept for 2 h, and cooled to room temperature. Centrifuge, wash, and dry to obtain a solidified product.

[0024] The solidified product obtained above was placed in a carbonization furnace, heated to 600° C. for 6 hours under the protection of nitrogen, an...

Embodiment 2

[0032] The operating conditions are the same as in Example 1, except that the carbon source is changed to furfural resin, and the acid solution is sulfuric acid. The diameter of the obtained porous carbon microspheres is 10-20um, and the specific surface area of ​​the product is 421.1m 2 / g, the pore volume is 0.441cm 3 / g, the micropore diameter is 0.5-2nm, the mesopore diameter is 5-50nm, and the macropore diameter is 50-150nm. Compared with the product obtained in Example 1, the proportion of macropores decreased. The electrochemical test was carried out by the same method as in Example 1, and the results showed that the reversible capacity reached 782mAh / g at a current density of 50mA / g, and the capacity remained at 497mAh / g after 50 cycles.

Embodiment 3

[0034] The operating conditions are the same as in Example 1, except that the carbon source used is urea-formaldehyde resin, the organic solvent is absolute ethanol, and the curing agent is tartaric acid. The diameter of the obtained porous carbon microspheres is about 10um, and the specific surface area of ​​the product is 500m 2 / g, the micropore diameter is 0.5-2nm, the mesopore diameter is 5-50nm, and the macropore diameter is 50 - 150nm. The electrochemical test was carried out by the same method as in Example 1, and the results showed that the reversible capacity reached 697mAh / g at a current density of 50mA / g, and the capacity remained at 460mAh / g after 50 cycles.

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Abstract

The invention relates to a porous carbon microsphere prepared by utilizing an emulsion aggregation method. The porous carbon microsphere is simultaneously provided with a microporous structure, a mesoporous structure and a macroporous structure. When the porous carbon microsphere is applied to the lithium ion battery negative electrode material, the macroporous structure is used for providing a fast migration passage for electrolyte, the mesoporous structure is identical to size of ion in the organic electrolyte, so that the rapid adsorption and desorption of the ion can be favored; the microporous structure favors the insertion of lithium ions, so that a lithium ion secondary battery has high specific capacitance and good high-power charging-discharging performance.

Description

technical field [0001] The invention relates to the application field of lithium-ion battery electrode materials, in particular to a porous carbon microsphere, a preparation method and an application in lithium-ion battery negative electrode materials. Background technique [0002] Lithium-ion batteries have been widely used in convenient electronic devices due to their high energy density, long cycle life, and low self-discharge rate. However, the large-scale equipment required for power batteries and long-term energy storage requires lithium-ion batteries to have high rate performance and long-term stable performance at high temperatures. These are urgent problems to be solved in the development of power lithium-ion batteries. Reducing the scale of lithium storage materials to the nanoscale is considered an effective way to improve the high power density of lithium-ion batteries, because the small particle size can reduce the diffusion path of lithium ions. In addition, d...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/62H01M4/133
CPCY02E60/122H01M4/604Y02E60/10
Inventor 宋怀河王芳芳宋冉冉陈晓红范成伟高利
Owner BEIJING UNIV OF CHEM TECH
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