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Knittable asymmetric capacitor and preparation method thereof

A capacitor, asymmetric technology, applied in the field of asymmetric capacitors and its preparation, can solve the problem of low energy density of capacitors, achieve good bending flexibility and electrochemical stability, wide application prospects, and improve the effect of flexible weaving performance

Inactive Publication Date: 2016-02-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a weavable asymmetric capacitor, the purpose of which is to solve the problem of low energy density of the weavable capacitor in the prior art by improving the materials of electrodes and electrolytes. question

Method used

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  • Knittable asymmetric capacitor and preparation method thereof
  • Knittable asymmetric capacitor and preparation method thereof
  • Knittable asymmetric capacitor and preparation method thereof

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preparation example Construction

[0041] The preparation method of the asymmetric capacitor of the present invention comprises the following steps:

[0042] (1) Select one or more carbon fibers or metal wires with a diameter of less than 100 μm as the positive current collector and the negative current collector, and then deposit a positive conductive layer and a negative conductive layer with a thickness of less than 500 nm on the surface of the positive current collector and the negative current collector, respectively, The voltage window of the positive electrode conductive layer and the negative electrode conductive layer on the surface unit length of the positive electrode current collector and the negative electrode current collector and the amount of charge of the load are balanced; + In the electrolyte, the voltage window of the positive conductive layer E 1 and the voltage window E of the negative electrode conductive layer 2 Meet, -1.23V≤E 2 1 ≤1.23V, 4:5≤|E 1 |:|E 2 |≤5:4, the amount of charge Q...

Embodiment 1

[0047] Step 1: Electrode Preparation

[0048] MnO 2 / Preparation of carbon fiber cathode material

[0049] S1. A carbon fiber with a length of 20 cm, a diameter of 10 μm, and a mass of 0.2 g was ultrasonically cleaned with acetone, ethanol, and water for 10 min, taken out and soaked in 20 ml of concentrated hydrochloric acid (H + The concentration is 12mol / L) and sonicated for 5min.

[0050] S2. 1mmol potassium permanganate, 0.5ml concentrated hydrochloric acid (H + The concentration is 12mol / L) is dissolved in the deionized water of 35ml, is mixed with permanganate solution, and described permanganate solution contains the MnO of 29mmol / L 4 - and 1.5mol / L of H + ; The carbon fiber that step (1) obtains is put into permanganate solution, and is transferred to autoclave lining, is put into 85 ℃ of baking ovens and reacts 20min; Reaction finishes and cools down to room temperature naturally, takes out sample and cleans with deionized water for 3 and dried under vacuum at ...

Embodiment 2

[0060] (1) Use cyclic voltammetry to generate polypyrrole on carbon fiber as the positive electrode, and use hydrothermal method to generate cobalt selenide on titanium wire as the negative electrode. By controlling the experimental parameters, the positive electrode material and negative electrode material per unit length can reach Charge balance, wherein the diameter of carbon fiber and titanium wire is 100μm;

[0061] (2) Dissolve 1g of lithium chloride and 10g of PVA powder in 89ml of deionized water, and stir at 90°C until the solution is clear and transparent. Soak the polypyrrole / carbon fiber electrode and the cobalt selenide / titanium wire electrode prepared in step (1) in the above PVA-LiCl solution for 10 minutes, take it out and dry it in an oven at 45°C for 10 minutes. Align a polypyrrole / carbon fiber with a cobalt selenide / titanium wire at the front and rear ends, place them side by side, dry in the air overnight, and remove excess water in the electrolyte to obtai...

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Abstract

The invention discloses a knittable asymmetric capacitor. The characteristics lie in that an anode and a cathode of the capacitor are respectively knitted by one or more current collectors, the current collectors are carbon fibers or metal wires with the diameter being less than 100mum, the surface of each current collector is sequentially attached with a conductive layer with the thickness being less than 500nm and a polyvinyl alcohol gel with the thickness being 10nm-100nm, the polyvinyl alcohol gel comprises LiCl with the mass fraction being 9%-62.5%, a voltage window E1 of the anode and a voltage window E2 of the cathode meet the conditions that the voltage window E2 is greater than or equal to -1.23V and less than 0V, and that the voltage window E1 is greater than 0V and less than or equal to 1.23V. The invention further discloses a preparation method of the asymmetric capacitor. Through the invention, a defect of low energy density of a knittable capacitor in the prior art is broken through, thereby having very important practical significance for flexible wearable electronic equipment.

Description

technical field [0001] The invention belongs to the field of energy storage devices, and more specifically relates to a braidable asymmetric capacitor and a preparation method thereof. Background technique [0002] All-solid-state flexible supercapacitors have the characteristics of high energy density, long cycle performance, ultra-light weight, excellent mechanical stability and excellent safety performance, and are widely used in digital cameras, all-electric vehicles and pulsed laser technology. As a future portable electronic product, wire-shaped supercapacitors, as energy storage devices for wearable electronic devices, have the advantages of smaller size, better flexibility and weaving performance compared with traditional flat supercapacitors. [0003] The braidable capacitors in the prior art are all symmetrical capacitors. For example, the patent document CN104240973A discloses a "transparent, flexible supercapacitor fabric and its preparation method", using carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/66H01G11/68H01G11/54H01G11/56H01G11/30H01G11/46H01G11/32H01G11/86
CPCY02E60/13H01G11/66H01G11/30H01G11/32H01G11/46H01G11/54H01G11/56H01G11/68H01G11/86
Inventor 朱明强喻能
Owner HUAZHONG UNIV OF SCI & TECH
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