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Preparation method of micro-expansive graphite anode material

A technology of graphite material and graphite negative electrode, which is applied in the field of preparation of micro-expanded graphite material

Active Publication Date: 2014-11-19
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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  • Preparation method of micro-expansive graphite anode material
  • Preparation method of micro-expansive graphite anode material
  • Preparation method of micro-expansive graphite anode material

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Embodiment Construction

[0027] 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:

[0028] 1) In some embodiments, during the oxidation intercalation, the reaction system is also stirred.

[0029] 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.

[0030] 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.

[0031] 4) In some embodiments, the drying is vacuum drying at a temperature of 60-70° C.; the vacuum drying time is 6-12 hours.

[0032] 5) In some embodiments, the puffing temperature is 400-650° C.,...

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Abstract

The invention relates to a preparation method of a micro-expansive graphite anode material which has a controllable expansion times being 2-10. The method includes following steps: mixing a battery-class powdery graphite material, an oxidizing agent and an intercalator according to a mass ratio of 1:0.05-1.0:0.5-10, performing an oxidizing and intercalating process for 30-60 min at 10-40 DEG C; performing a filtering process at room temperature to separate a solid subject, washing the solid subject until a pH value of a filtrate is 6-7; performing a drying process; feeding the solid subject to a horizontal tubular furnace; performing expansion in an inner atmosphere at 200-800 DEG C for 1-30 min; and performing thermal insulation to obtain the anode material.

Description

technical field [0001] The invention relates to micro-expanded graphite, in particular to a method for preparing 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 ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01G9/042
CPCH01G11/06H01G11/32H01M4/5835H01M10/0525Y02E60/10
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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