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Lithium ion capacitor

A lithium-ion, capacitor technology, applied in the field of lithium-ion capacitors

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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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 discloses a lithium ion capacitor which comprises a membrane, a lithium ion supplying source and a shell and further comprises a cathode piece, an anode piece and organic electrolyte containing lithium. Micro-expansion graphite materials are adopted for the cathode piece to serve as cathode active materials. The micro-expansion graphite materials, a conductive agent and a binding agent are evenly mixed in a solvent according to the mass ratio of 80-90:4-8:6-12, prepared into slurry to be coated on the positive face and the reverse face of a copper foil current collector and dried. The coating thickness of the single face ranges from 30 micron to 100 micron, roll-in is conducted on electrode pieces through a roller press, and the cathode piece of the lithium ion capacitor can be obtained by cutting the electrode pieces obtained after the roll-in is conducted through a dividing and cutting machine.

Description

technical field [0001] The invention relates to a lithium ion capacitor, in particular to a lithium ion capacitor using a micro-expanded graphite material as a negative electrode material. 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 negative electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/32H01G11/06
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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