Hybrid power device and method for manufacturing the same

• US 20030035982A1
• Filed: 03/26/2002
• Published: 02/20/2003
• Est. Priority Date: 08/14/2001
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Chang, Soon-ho, Ryu, Kwang-sun, Park, Yong-joon
• Application Number:
  US10/107,520
• Publication Number:
  US 20030035982A1
• Time in Patent Office: Days
• US Class Current: 429/7
• CPC Class Codes: H01G 11/06 with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
• CPC Class Codes: H01G 11/08 Structural combinations, e.g. assembly or connection, of hybrid or EDL capacitors with other electric components, at least one hybrid or EDL capacitor being the main component
• CPC Class Codes: H01G 11/50 specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation
• CPC Class Codes: H01M 10/4264 with capacitors
• CPC Class Codes: H01M 14/00 Electrochemical current or voltage generators not provided for in groups H01M6/00 - H01M12/00; Manufacture thereof
• CPC Class Codes: H01M 16/00 Structural combinations of different types of electrochemical generators
• CPC Class Codes: H01M 2300/0025 Organic electrolyte
• CPC Class Codes: H01M 4/381 Alkaline or alkaline earth metals elements H01M4/40 takes precedence
• CPC Class Codes: H01M 4/602 Polymers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A hybrid power device having three electrodes and a method for fabricating the same are provided. The hybrid power device includes a lithium secondary battery and a supercapacitor in a cell and has three electrodes. The three electrodes have a common electrode including a positive electrode of the lithium secondary battery, which is as the positive electrode of the supercapacitor, a negative electrode of the lithium secondary battery including lithium metal and the other electrode of the supercapacitor. This hybrid power device is superior to that of a lithium secondary battery, and further is more economical and practical than a case where a lithium secondary battery and a supercapacitor are individually fabricated and used as a hybrid.

Claims

1. A hybrid power device including a lithium secondary battery and a supercapacitor in a cell, and having three electrodes,

wherein the three electrodes comprise:

a common electrode including a positive electrode of the lithium secondary battery, which is as the positive electrode of the supercapacitor;

a negative electrode of the lithium secondary battery including lithium metal and the other electrode of the supercapacitor.

2. The hybrid power device of claim 1, wherein the common electrode comprises a conducting polymer electrode that can be used as the positive electrode of the lithium secondary battery and the one electrode of the supercapacitor.

3. The hybrid power device of claim 2, wherein an electrode active material for the conducting polymer electrode is a material selected from a group of consisting of polyaniline, polyppyrrole, polythiopene, or their derivative.

4. The hybrid power device of claim 1, wherein the same electrolyte solution that available both in the lithium secondary battery and the supercapacitor is used.

5. The hybrid power device of claim 4, wherein lithium salt for the electrolyte solution is a material selected from a group of LiPF₆, LiClO₄, LiBF₄, LiCF₃SO₃ or LiN(CF₃SO₂)₃, or a mixing material of at least two materials selected from the group.

6. The hybrid power device of claim 4, wherein the solvent of the electrolyte solution is a material selected from a group of ethylene carbonate, diethyl carbonate, dimethyl carbonate, propylene carbonate, acetonitrile, diethoxyethane, dioxolane, tetrahydrouran, γ

-butyrolactone or dimethylsulfoxide, or a mixing material of at least two materials selected from the group.

7. The hybrid power device of claim 1, wherein a porous separator or a polymer electrolyte is positioned between the positive and negative electrodes of the lithium secondary battery, and between both the electrodes of the supercapacitor.

8. The hybrid power device of claim 7, wherein the porous separator is formed of polyethylene, polypropylene, or their multilayers.

9. The hybrid power device of claim 7, wherein the polymer electrolyte is formed of a material selected from a group of poly(vinylenedene fluoride-co-hexafluoro propylene), polyacrylonitrile or polymethylmethacrylate.

10. The hybrid power device of claim 1, further comprising a logic circuit that is switched properly according to the extent of energy required in an outer load.

11. The hybrid power device of claim 10, wherein the common electrode is connected with the positive terminal of the logic circuit, and

the negative electrode of the lithium secondary battery and one electrode of the supercapacitor are independently connected with the negative terminal of the logic circuit, thereby reducing the interference between the negative electrode of the lithium secondary battery and the one electrode of the supercapacitor, and,

the logic circuit is connected with the negative electrode of the lithium secondary battery to operate the lithium secondary battery for the supply of energy when energy required by an outer side is small or connected with the one electrode of the supercapacitor to operate the supercapacitor for the supply of energy when energy required by an outer side is large.

12. A method of fabricating a hybrid power device comprising:

preparing a conducting polymer electrode, which is to be used as a common electrode, by coating the both sides of an electric charge collector with an electrode active material, and then, preparing a conducting polymer electrode, which is to be used as the other electrode of the supercapacitor, by coating one side of another electric charge collector with an electrode active material;

sequentially depositing a lithium metal electrode, a porous separator, a conducting polymer electrode, which is to be used a common electrode, a porous separator, and a conducting polymer electrode, which is to be used as electrodes of the supercapacitor;

applying an electrolyte solution to the resultant; and

packing the resultant by a material that is available for thermal vacuum packing.

13. A method of fabricating a hybrid power device comprising:

sequentially depositing a conducting polymer electrode in the shape of an electrode sheet, a polymer electrolyte, a conducting polymer electrode in the shape of an electrode sheet, which is a common electrode, and a polymer electrolyte;

laminating the resultant at a predetermined time under a predetermined pressure to glue the materials of the resultant together;

dipping the glued resultant into an electrolyte solution;

depositing a piece of lithium metal on the resultant; and

packing the resultant by a material that is available for thermal vacuum packing.