Super capacitor using mono-layer graphite as electrode material

A supercapacitor and single-layer graphite technology, applied in the direction of electrolytic capacitors, capacitors, hybrid capacitors, etc., can solve the problems of high cost and unsuitable for large-scale industrial applications, achieve high energy density, reduce ion migration energy barrier, and large The effect of specific surface area

Inactive Publication Date: 2009-03-11
TIANJIN PULAN NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the physical synthesis of single-layer graphite is costly and not suitable for large-scale industrial applications.

Method used

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  • Super capacitor using mono-layer graphite as electrode material
  • Super capacitor using mono-layer graphite as electrode material
  • Super capacitor using mono-layer graphite as electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1) Preparation of soluble single-layer graphite oxide material

[0027] References for the preparation of soluble single-layer graphite oxide materials (Evaluation of Solution-ProcessedReduced Graphene Oxide Films as Transparent Conductors, Héctor A.Becerril, JieMao, unfeng Liu, Randall M.Stoltenberg, Zhenan Bao, and Yongsheng Chen, AcsNano, 2(3 ), 463-470 (2008). The soluble single-layer graphite oxide material obtained therein can be dried through high-speed centrifugal layering to obtain soluble single-layer graphite oxide materials with different sheet numbers and sizes, thereby obtaining single-layer graphite materials with different specific surface areas. At 8000 r / min, 16 mg / ml aqueous solution of soluble single-layer graphite oxide material was centrifuged at high speed for 60 minutes to obtain the lower layer of solid, which was collected as the first layer of product, and the size of the flakes was 2 μm 2 ~400μm 2 Left and right distribution; the upper layer...

Embodiment 2

[0032] The reduced single-layer graphite obtained in embodiment 1 (the third layer single-layer graphite oxide product, flake size is at 300nm 2 ~800nm 2 Between) the solid powder obtained after the material is dried at low temperature is pressed on a nickel foam collector plate (diameter 13cm,) to make a circular electrode sheet, and the mass of the active material is about 7 mg; two electrode sheets with similar masses are placed face to face, The middle is separated by a hydrophilic porous diaphragm, and 30wt% KOH electrolyte is added dropwise and then packaged into a button battery case to obtain a supercapacitor. The supercapacitor prepared in this example has a specific capacitance of 180 F / g, a specific power of 18.3 kW / kg, and an energy density of 23.5 Wh / kg.

Embodiment 3

[0034] The reduced single-layer graphite obtained in embodiment 1 (the third layer single-layer graphite oxide product, flake size is at 300nm 2 ~800nm 2 Between) The solid powder obtained after the material is dried at low temperature is pressed on the foamed nickel collector plate under a certain pressure (about 160MPa, the same below) to make a circular electrode sheet with a diameter of 13cm, and the mass of the active material is about 7mg; Two electrode sheets of similar mass are placed face to face, separated by a hydrophilic porous diaphragm (polypropylene film) in the middle, and 5wt% KOH electrolyte is added dropwise and packaged into a button battery case to obtain a supercapacitor. The specific capacitance of the supercapacitor prepared in this example is 103F / g, the specific power is 10.5kW / kg, and the energy density reaches 14.3Wh / kg.

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Abstract

The invention relates to a super capacitor which uses a single-layer graphite material as an electrode material. The super capacitor comprises an electrode plate, an electrolyte and a membrane, wherein the electrode plate is prepared by a bubble nickel connecting plate of single-layer graphite which contains active substances, the quality content of the active substance single-layer graphite is 2 to 30wt percent of the quality of a collecting electrode plate, and the single-layer graphite is a soluble single-layer graphite oxide material or an annealed or reductive single-layer graphite material. Compared with the traditional super capacitor which uses active carbon as the electrode material, the super capacitor of the invention saves power resources; compared with the super capacitor which uses a carbon nano tube as the electrode material, the super capacitor of the invention has low cost and good performance and has higher specific capacitance and high energy density (which can reach 50Whkg<-1>), and the specific power of the super capacitor can reach as higher as 40kWkg<-1>.

Description

technical field [0001] The invention relates to the manufacture of a supercapacitor, in particular to a supercapacitor using a single-layer graphite material as an electrode material. Background technique [0002] Supercapacitors (supercapacitors), also known as electrochemical capacitors (ECs), have good pulse performance and large-capacity energy storage performance, can charge and discharge instantaneous high current, and are light in weight. They are a new type of green and environmentally friendly energy storage device. Therefore, it has unique application advantages in many occasions. Supercapacitors can be used as backup power sources for computers, video cameras, timers, etc., and can also be used for high-tech weapons that require continuous firing and high-current pulse power, such as laser weapons and electric guns. Supercapacitors are also called electric double layer capacitors. Electrochemical capacitors store electric energy by forming an electric double lay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/155H01G9/042H01G9/058H01G9/035H01G9/038H01G9/02H01G11/36H01G11/38
CPCY02E60/13H01G9/042H01G11/38H01G11/36H01G9/058
Inventor 陈永胜黄毅王燕马延风
Owner TIANJIN PULAN NANO TECH
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