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Capacitor, and capacitor electrode

A technology for capacitors and positive electrodes, which is applied in the field of capacitors and electrodes for capacitors, which can solve the problems of low energy density and achieve high energy density and high durability

Active Publication Date: 2021-04-13
TEIKOKU PISTON RING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electric double layer capacitors have a problem of low energy density (volume energy density) compared with secondary batteries.

Method used

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  • Capacitor, and capacitor electrode
  • Capacitor, and capacitor electrode
  • Capacitor, and capacitor electrode

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0077] The synthesis method of the graphene porous carbon material constituting the graphene porous carbon sheet of the present embodiment includes: forming a graphene layer on the surface of nanoparticles composed of metal oxides; removing the nanoparticles composed of metal oxides and a process of heating the graphene layer covering the fine pores. For example, a single-layer to three-layer graphene is formed to cover aluminum oxide particles with an average particle diameter of 2nm to 20nm, preferably 3nm to 10nm, preferably a single-layer to two-layer graphene, and more preferably a single-layer graphene .

[0078] Specifically, for example, (1) Keep at 700° C. to 1,200° C. for 1 to 5 hours while flowing methane gas, preferably at 800° C. to 1,000° C. for 1 to 3 hours, and then cool to room temperature. (2) Next, alumina is removed by immersing the alumina particles covered with graphene in hydrofluoric acid. (3) Thereafter, after raising the temperature to 1800° C., kee...

Embodiment 1

[0128] (Synthesis of powdered graphene porous carbon material)

[0129] Alumina particles (trade name: TM300) manufactured by Daimei Chemical Industry Co., Ltd. with an average particle diameter of 7 nm were placed in a quartz retort (autoclave) and then placed in a rotary furnace.

[0130] (1) Heating to 900° C. at a temperature increase rate of 10° C. / min while flowing argon gas at a flow rate of 500 ml / min.

[0131] (2) Thereafter, the temperature was kept at 900° C. for 2 hours while flowing methane gas at a flow rate of 500 ml / min.

[0132] (3) Thereafter, it was cooled to room temperature while flowing argon gas at a flow rate of 500 ml / min.

[0133] (4) The set alumina particles were taken out and immersed in hydrofluoric acid to remove alumina.

[0134] (5) Thereafter, while flowing argon gas at a flow rate of 500ml / min, heat it to 1800°C at a rate of 10°C / min, keep it for 2 hours, take it out after cooling to room temperature, and obtain the powdered graphite of thi...

Embodiment 2

[0146] A graphene porous carbon sheet (GMS sheet B) was produced in the same manner as in Example 1 except that the length of the carbon nanotubes used in the graphene porous carbon sheet was 0.5 mm. A 2032-type coin cell was produced in the same manner as in Example 1 except that the produced graphene porous carbon sheet (GMS sheet B) was used. The cross-section of the GMS sheet A was observed using a scanning electron microscope JSM-IT100 manufactured by JEOL Ltd., and the length of the carbon nanotubes was 10 μm to 70 μm. The thickness of the active material layer of the fabricated electrode is 450 μm, and the density of the active material layer is 0.11 g / cm 3 .

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Abstract

Provided is a capacitor having excellent withstand voltage and high energy density by increasing capacitance and voltage. The capacitor comprises at least a positive electrode, a negative electrode, and an electrolyte. The positive electrode contains a positive electrode active material, and the negative electrode contains a negative electrode active material. The positive electrode active material and the negative electrode active material include a graphene porous carbon sheet including a graphene porous carbon material and carbon nanotubes. The graphene porous carbon material is a porous carbon material comprising graphene, the positive electrode-side current collector and the negative electrode-side current collector are aluminum materials, the aluminum materials are covered with an amorphous carbon coating film, and the thickness of the amorphous carbon coating film is 60 nm or more and 300 nm or less.

Description

technical field [0001] The present invention relates to a capacitor and an electrode for a capacitor. [0002] This application claims priority based on Japanese Patent Application No. 2018-197975 filed in Japan on October 19, 2018, and the contents of the Japanese application are incorporated in the present invention. Background technique [0003] Conventionally, electric double layer capacitors (for example, refer to Patent Document 1) and secondary batteries are known as techniques for storing electric energy. Electric double-layer capacitors (EDLC: Electric double-layer capacitor) are exceptionally superior in life, safety, and output density compared to secondary batteries. However, the electric double layer capacitor has a problem that its energy density (volume energy density) is lower than that of a secondary battery. [0004] Here, the energy (E) stored in the electric double layer capacitor is expressed as E=1 / 2×C×V using the capacitance (C) of the capacitor and ...

Claims

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Application Information

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IPC IPC(8): H01G11/36H01G11/24H01G11/28H01G11/68
CPCH01G11/24H01G11/68H01G11/36H01G11/28
Inventor 小林直哉矶田绫乃川合清行志水利彰川口佑介京谷隆西原洋知野村启太
Owner TEIKOKU PISTON RING CO LTD
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