Method for embedding lithium on two sides

Abstract

The invention discloses a double-sided lithium intercalation method, and belongs to the technical field of super capacitors for electrochemical energy storage. In the assembling process of the supercapacitor, the electrochemical energy storage device capable of being practically applied is developed through the lamination design. The carbon material with high specific surface area and low defect is used as the active material, and the obtained supercapacitor not only achieves high energy, but also is excellent in stability and super long in cycle life. And meanwhile, the method is simple in technological process, compatible with the existing process and remarkable in lithium intercalation effect, so that the method has a great application prospect.

Description

Technical Field

[0001] The invention relates to the field of lithium battery capacitors, and in particular to a method for double-sided lithium embedding. Background Art

[0002] Supercapacitors are composed of aluminum shells, electrolytes, and supercapacitor cells. Supercapacitors, also known as electrochemical capacitors, rely on double-layer ion adsorption or redox reactions on the electrode surface to store charge, and their performance is between physical capacitors and secondary batteries. Supercapacitors not only have a much higher energy density than physical capacitors, but also have characteristics that are unmatched by secondary batteries, such as a charge and discharge speed that can be completed in seconds, high power / current charge and discharge, a cycle life of tens of thousands of times, a charge and discharge efficiency close to 100%, and can be used in extreme high and low temperature environments (-40 to 70°C), as well as high safety and long-term maintenance-free. These superior properties make supercapacitors expected to be widely used in consumer electronics, electric vehicles, smart grids, energy generation systems, aerospace, and military fields. However, the widespread application of supercapacitors is still limited by their low energy density. How to further improve their energy density and bring it close to the level of secondary batteries while maintaining the advantages of supercapacitors is a problem that needs to be solved urgently. Recently, through the method of electrochemical charge injection, the energy state of a single electrode in a supercapacitor has been successfully improved to improve the energy density of carbon nanomaterial symmetrical supercapacitors. In order to further realize practical applications, the present invention proposes a device design of a double-sided lithium embedded supercapacitor. Summary of the invention

[0003] The purpose of the present invention is to provide a double-sided lithium insertion method, which has a simple manufacturing method and a simple structure, improves the lithium insertion speed, and improves the high energy performance of the supercapacitor.

[0004] To achieve the above object, the method adopted by the present invention is: A method for double-sided lithium embedding includes a supercapacitor structure in which a positive electrode, a negative electrode sheet and a diaphragm are assembled in a stacked manner, and a metal lithium electrode is arranged on both sides of the outermost negative electrode sheet respectively, and the outermost negative electrode and the metal lithium electrode are separated by a diaphragm, and an electrolyte is injected to assemble the supercapacitor.

[0005] According to the double-sided lithium embedding method, the single-piece positive and negative electrode sheets and the separator are assembled in sequence in a stacking manner. After the required number of positive and negative electrode sheets and separators are stacked, a metal lithium electrode is respectively arranged on both sides of the outermost negative electrode, and the outermost negative electrode is separated from the metal lithium electrode by a separator to obtain the supercapacitor cell.

[0006] According to the double-sided lithium insertion method, the metal lithium electrode is calculated according to the capacity of the designed supercapacitor.

[0007] According to the double-sided lithium insertion method, the positive and negative electrodes in the supercapacitor are prepared by conventional processes, that is, active electrode materials are mixed with a binder and a conductive agent, coated, pressed and sliced.

[0008] According to the double-sided lithium insertion method, the materials of the positive and negative electrodes include but are not limited to activated carbon, template carbon, activated carbon fiber, carbon aerosol, carbon nanotubes, graphene, cracked carbon or graphite; the metal oxide is ruthenium oxide, manganese oxide, nickel oxide, vanadium oxide, tin oxide, cobalt oxide or iron oxide; the metal hydroxide material is nickel hydroxide, cobalt hydroxide or iron hydroxide; the conductive polymer material is polypyrrole, polythiophene, polyaniline, polyparaphenylene or polyphenylene. One or more.

[0009] According to the double-sided lithium insertion method, the positive and negative electrode sheets in the supercapacitor are made by conventional processes, that is, the active electrode material is mixed with a binder and a conductive agent, coated, pressed and sliced, and the electrode sheet material is a composite material of one or more of carbon materials, metal oxides, metal hydroxide materials and conductive polymer materials.

[0010] According to the double-sided lithium insertion method, the carbon material is activated carbon, template carbon, activated carbon fiber, carbon aerosol, carbon nanotubes, graphene, pyrolysis carbon or graphite; the metal oxide is ruthenium oxide, manganese oxide, nickel oxide, vanadium oxide, tin oxide, cobalt oxide or iron oxide; the metal hydroxide material is nickel hydroxide, cobalt hydroxide or iron hydroxide; the conductive polymer material is polypyrrole, polythiophene, polyaniline, polyparaphenylene or polyphenylene.

[0011] According to the double-sided lithium insertion method, the separator includes but is not limited to one or more of Tencel fiber, ceramic fiber, polyimide acid ammonium salt, and PP.

[0012] On the other hand, an embodiment of the present invention provides a double-sided lithium insertion method, wherein the supercapacitor comprises the supercapacitor cell, a supercapacitor aluminum shell, and an electrolyte. The supercapacitor cell is placed in the supercapacitor aluminum shell, and the electrolyte is then injected into the supercapacitor aluminum shell.

[0013] The advantages of the present invention are: through this double-sided lithium insertion method, the lithium insertion speed can be quickly and effectively improved, saving a lot of time spent on static lithium insertion, thereby improving the reliability of the supercapacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a schematic diagram of a double-sided lithium embedded mold of the present invention. DETAILED DESCRIPTION

[0015] Exemplary embodiments will be described in detail below. However, these embodiments are exemplary, and the present disclosure is not limited thereto.

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments: The present invention Figure 1 As shown, a method for double-sided lithium embedding is provided. The supercapacitor structure is to assemble the positive electrode, the negative electrode sheet and the separator in a stacking manner. A metal lithium electrode (2) is provided on both sides of the outermost negative electrode. The outermost negative electrode (1) is separated from the metal lithium electrode (2) by a separator (3). After injecting electrolyte, the supercapacitor is assembled. Specifically, the single-piece positive and negative electrode sheets and the separator are assembled in sequence in a stacking manner. After the required number of positive and negative electrode sheets and separators are stacked, a metal lithium electrode (2) is respectively arranged on both sides of the outermost negative electrode (1), and the outermost negative electrode (1) and the metal lithium electrode (2) are separated by a separator (3), thereby obtaining the supercapacitor cell.

[0017] Specifically, the metal lithium electrode is calculated according to the capacity of the designed supercapacitor.

[0018] Specifically, the positive and negative electrode sheets in the supercapacitor are prepared by conventional processes, that is, active electrode materials are mixed with a binder and a conductive agent, coated, pressed and sliced.

[0019] Specifically, the materials of the positive and negative electrode sheets include but are not limited to activated carbon, template carbon, activated carbon fiber, carbon aerosol, carbon nanotubes, graphene, pyrolysis carbon or graphite; the metal oxide is ruthenium oxide, manganese oxide, nickel oxide, vanadium oxide, tin oxide, cobalt oxide or iron oxide; the metal hydroxide material is nickel hydroxide, cobalt hydroxide or iron hydroxide; the conductive polymer material is polypyrrole, polythiophene, polyaniline, polyparaphenylene or polyphenylene. One or more.

[0020] Specifically, the separator includes but is not limited to one or more of Tencel fiber, ceramic fiber, polyimide acid ammonium salt, and PP.

[0021] Specifically, the supercapacitor comprises the supercapacitor core, a supercapacitor aluminum shell, and an electrolyte. The supercapacitor core is placed in the supercapacitor aluminum shell, and the electrolyte is then injected into the supercapacitor aluminum shell.

[0022] The double-sided lithium insertion method can quickly and effectively increase the lithium insertion speed and reduce the time spent on lithium insertion, thereby improving the lithium insertion efficiency of the supercapacitor and reducing time costs.

[0023] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to perform equivalent replacements on parts thereof. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention. Although the above describes the specific implementation methods of the present invention, it is not intended to limit the protection scope of the present invention. Those skilled in the art should understand that, based on the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A method for double-sided lithium insertion, characterized in that: The supercapacitor structure is to assemble the positive electrode, negative electrode and diaphragm in a stacked manner. At the same time, a metal lithium electrode is set on both sides of the outermost negative electrode. The outermost negative electrode and the metal lithium electrode are separated by a diaphragm. After the electrolyte is injected, it is assembled into a supercapacitor.

2. The method for double-sided lithium insertion according to claim 1, characterized in that: The single-piece positive and negative electrode sheets and the separator are assembled in sequence in a stacking manner. After the required number of positive and negative electrode sheets and separators are stacked, a metal lithium electrode is respectively arranged on both sides of the outermost negative electrode, and the outermost negative electrode is separated from the metal lithium electrode by a separator to obtain the supercapacitor cell.

3. The method for double-sided lithium insertion according to claim 1, characterized in that: The metal lithium electrode is calculated according to the capacity of the designed supercapacitor.

4. The method for double-sided lithium insertion according to claim 1, characterized in that: The positive and negative electrode sheets in the supercapacitor are prepared by conventional processes, that is, active electrode materials are mixed with a binder and a conductive agent, coated, pressed and sliced.

5. The method for double-sided lithium insertion according to claim 1, characterized in that: The materials of the positive and negative electrode sheets include but are not limited to activated carbon, template carbon, activated carbon fiber, carbon aerosol, carbon nanotubes, graphene, pyrolysis carbon or graphite; the metal oxide is ruthenium oxide, manganese oxide, nickel oxide, vanadium oxide, tin oxide, cobalt oxide or iron oxide; the metal hydroxide material is nickel hydroxide, cobalt hydroxide or iron hydroxide; the conductive polymer material is polypyrrole, polythiophene, polyaniline, polyparaphenylene or polyphenylene. One or more of.

6. The double-sided lithium insertion method according to claim 1, characterized in that: The separator includes but is not limited to one or more of Tencel fiber, ceramic fiber, polyimide acid ammonium salt, and PP.

7. A method for double-sided lithium insertion as claimed in any one of claims 1 to 6, characterized in that: The supercapacitor comprises the supercapacitor core, the supercapacitor aluminum shell, and an electrolyte. The supercapacitor core is placed in the supercapacitor aluminum shell, and the electrolyte is then injected into the supercapacitor aluminum shell.

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