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Application of micro-expanded graphite material

A graphite material, micro-expansion technology, applied in the application field of micro-expansion graphite material

Active Publication Date: 2014-11-12
RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no application of micro-expanded graphite for the negative electrode of lithium-ion capacitors

Method used

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  • Application of micro-expanded graphite material
  • Application of micro-expanded graphite material
  • Application of micro-expanded graphite material

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Embodiment Construction

[0026] According to the micro-expanded graphite negative electrode material provided by the technical solution of the first aspect of the present invention, or the preparation method provided by the technical solution of the second aspect of the present invention, or the application provided by the technical solution of the third aspect of the present invention:

[0027] 1) In some embodiments, during the oxidation intercalation, the reaction system is also stirred.

[0028] 2) In some embodiments, after the solid is washed until the pH of the filtrate is 6-7, the solid is washed with absolute ethanol and then dried.

[0029] 3) In some embodiments, the mass ratio of the battery-grade graphite powder material to the oxidizing agent and the intercalation agent is 1:0.2-0.6:2-5.

[0030] 4) In some embodiments, the drying is vacuum drying at a temperature of 60-70° C.; the vacuum drying time is 6-12 hours.

[0031] 5) In some embodiments, the puffing temperature is 400-650° C.,...

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Abstract

The invention relates to a method for preparing a micro-expanded graphite anode material of which the expansion times are controllable within 2-10 times. The method comprises the following steps: mixing a battery-grade powder graphite material with an oxidizing agent and an intercalator according to a mass ratio of 1 to (0.05-1.0) to (0.5-10), carrying out oxidization and intercalation for 30-60 minutes at 10-40 DEG C, subsequently filtering at the room temperature to separate solid, washing the solid till the pH value of filtrate is 6-7, drying, subsequently feeding into a horizontal tube type furnace for puffing for 1-30 minutes at 200-800 DEG C in the presence of inert atmosphere, and keeping the temperature, thereby obtaining the micro-expanded graphite material.

Description

technical field [0001] The invention relates to micro-expanded graphite, in particular to the application of a micro-expanded graphite material used for the negative electrode of a lithium ion capacitor. Background technique [0002] Lithium-ion capacitor (LIC, Lithium-ion capacitor) has a negative electrode graphite pre-intercalated with lithium, so it is actually an asymmetric capacitor with different charging and discharging principles between the positive electrode and the negative electrode. It combines the advantages of supercapacitors and lithium-ion batteries. Both energy density and power density are high, so it has wider application prospects. [0003] Lithium-ion capacitors have both high energy density and power density, and the charge and discharge current density required by their application fields is generally higher than that of lithium-ion batteries. When the graphite material commonly used as the negative electrode of lithium-ion batteries is used as the ...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01G11/32H01G11/86H01G11/50
CPCY02E60/13
Inventor 郭德超何凤荣张显郭义敏张啟文
Owner RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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