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A kind of Fe-doped iron oxide large-area capacitance material, high energy density and power density capacitor and its preparation method and application

A large-area, iron oxide technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of limited area power density, low conductivity, etc., and achieve easy promotion, high power density, and simple equipment Effect

Active Publication Date: 2018-04-10
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for FeOOH, its low conductivity greatly limits its areal power density

Method used

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  • A kind of Fe-doped iron oxide large-area capacitance material, high energy density and power density capacitor and its preparation method and application
  • A kind of Fe-doped iron oxide large-area capacitance material, high energy density and power density capacitor and its preparation method and application
  • A kind of Fe-doped iron oxide large-area capacitance material, high energy density and power density capacitor and its preparation method and application

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preparation example Construction

[0030] The present invention further discloses a method for preparing the above-mentioned symmetrical electrochemical capacitor, which includes the following steps:

[0031] Step a) Prepare the electrode material as CC@Fe 2 o 3 -F;

[0032] Step b) Assembling positive and negative electrodes: two pieces of electrode material CC@Fe 2 o 3The middle of -F is separated by a diaphragm, the electrolyte is injected, and a current collector is added to the outside of the positive and negative materials to obtain a symmetrical electrochemical capacitor. In order to further increase the energy density of the symmetrical electrochemical capacitor, the concentration of the KOH solution is preferably 4-6 mol / L.

Embodiment 1

[0037] 1. Preparation of electrode materials:

[0038] At room temperature, weigh 2.0mmol Fe(NO 3 ) 3 9H 2 O, a certain amount of NH 4 F and 5.0mmol urea, add 17.5mL H 2 O with 17.5 mL ethanol to dissolve. A piece of carbon cloth (2 cm x 1.5 cm) was then placed into the solution after sonication in deionized water and ethanol for 20 min. After soaking the carbon cloth for 30 minutes, the solution was transferred to a 50 mL Teflon-lined stainless steel autoclave. Next, the kettle was sealed and heated to 120° C. in an electric oven. After heating for 6 hours, the product was washed several times with water and ethanol, then vacuum-dried at 60°C for 3 hours, and finally pyrolyzed in air (2°C / min to 400°C and held for 2 hours).

[0039] NH 4 The addition amount of F is respectively 1, 2, 4mmol, and another comparison: with 2mmol NH 4 Cl instead of 2 mmol NH 4 The comparison of F without doping with fluorine.

[0040] The above parts are recorded as CC@Fe in turn 2 o ...

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Abstract

The invention provides a F-doped iron oxide large-area capacitance material and a preparation method thereof. The capacitance material is CC@Fe2O3-F, wherein CC is carbon cloth, and @ represents Fe2O3-F coated on the surface of CC. The invention provides a symmetrical electrochemical capacitor, which includes a positive electrode, a negative electrode, an electrolyte, a diaphragm and a current collector, and the material of the positive electrode and the negative electrode is CC@Fe2O3-F. The symmetrical electrochemical capacitor provided by the present invention uses cheap and easy-to-obtain carbon cloth as the electrode raw material, and the prepared symmetrical electrochemical capacitor has high capacitance per unit area, good cycle performance, high stability, and high energy density and power density. . The symmetrical electrochemical capacitor provided by the present invention obtains electrode materials with superior electrochemical properties through a simple, effective and environmentally friendly reaction, and assembles a symmetrical electrochemical capacitor. The equipment used is simple and easy to popularize, and the concentration of the reaction solution can be adjusted and reaction time to obtain electrode materials with different electrochemical properties.

Description

technical field [0001] The invention relates to the field of electrochemical capacitors, in particular to a symmetrical electrochemical capacitor and its preparation method and application. Background technique [0002] Supercapacitors, ie electrochemical capacitors, are one of the most promising candidates to interface conventional dielectric capacitors with lithium batteries due to their high power density and long lifetime. Therefore, many governments and enterprises have invested a lot of time and money in developing, researching and developing this technology. However, supercapacitors also have some disadvantages, such as low energy density and high production cost, which will become great challenges for their further development. In addition, for small electronic products or fixed energy storage devices, energy storage per unit area (distributed capacitance) is an important indicator for evaluating the performance of supercapacitors. [0003] Designing new electrodes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/46H01G11/86
CPCY02E60/13
Inventor 俞书宏陈立锋马骁
Owner UNIV OF SCI & TECH OF CHINA
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