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Flexible asymmetric supercapacitor with super high energy density and preparation method thereof

A supercapacitor, energy density technology, used in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor electrolytes, etc., can solve environmental pollution, toxicity and other problems, achieve broad application prospects, long cycle life, excellent soft effect

Active Publication Date: 2018-10-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the operating voltage of symmetric supercapacitors can be increased to above 2.5V by using ionic liquid electrolytes, the components in ionic liquid electrolytes are usually toxic and have potential environmental pollution problems.

Method used

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  • Flexible asymmetric supercapacitor with super high energy density and preparation method thereof
  • Flexible asymmetric supercapacitor with super high energy density and preparation method thereof
  • Flexible asymmetric supercapacitor with super high energy density and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A flexible asymmetric supercapacitor with ultrahigh energy density, the structure of the supercapacitor is as follows figure 1 As shown, it includes the electrode plates on both sides and the electrolyte layer in the middle of the two electrode plates. The positive electrode plate is a carbon nanotube film with manganese dioxide nanosheets grown on both sides, and the negative electrode plate is a carbon nanotube film grown on both sides. The carbon nanotube film of the molybdenum sulfide nanosheet, the electrolyte in the electrolyte layer is a lithium chloride system of polyvinyl alcohol.

[0059] Carbon nanotube / manganese dioxide composites were prepared by electrochemical deposition in a three-electrode system: the nitric acid-treated carbon nanotube film, platinum sheet, and silver / silver chloride electrode were used as the working electrode, counter electrode, and reference electrode, respectively. Electrode, electrolyte contains 0.05mol L -1 Manganese sulfate, 0....

Embodiment 2

[0067] Adopt and embodiment 1 similar preparation method, specifically as follows:

[0068] (1) With the carbon nanotube thin film soaked in nitric acid as the working electrode, the platinum sheet as the counter electrode, and the silver / silver chloride electrode as the reference electrode, use 0.05mol L -1 Manganese sulfate, 0.05mol L -1 The mixed aqueous solution of sodium acetate and 15% volume ethanol was used as the electrolyte for electrochemical deposition, and the electrochemical deposition was performed at 4mA cm -2 It was carried out at a constant current density for 40 minutes. After the electrochemical deposition was completed, it was rinsed with deionized water for 3 to 5 times, and then dried at 55°C for 2 hours to obtain a positive electrode plate.

[0069] (2) Dissolve 0.519g ammonium molybdate tetrahydrate and 3.1955g thiourea in deionized water to obtain a mixed solution, then soak the treated carbon nanotube film in nitric acid into the mixed solution, and...

Embodiment 3

[0074] Adopt and embodiment 1 similar preparation method, specifically as follows:

[0075] (1) With the carbon nanotube film soaked in nitric acid as the working electrode, the platinum sheet as the counter electrode, and the silver / silver chloride electrode as the reference electrode, use 0.1mol L -1 Manganese sulfate, 0.1mol L -1 The mixed aqueous solution of sodium acetate and 10% volume ethanol was used as the electrolyte for electrochemical deposition, and the electrochemical deposition was performed at 5mA cm -2 It was carried out at a constant current density for 10 minutes. After the electrochemical deposition was completed, it was rinsed with deionized water for 3 to 5 times, and then dried at 65°C for 1 hour to obtain the positive electrode plate.

[0076] (2) Dissolve 3.638g ammonium molybdate tetrahydrate and 0.4565g thiourea in deionized water to obtain a mixed solution, then immerse the carbon nanotube film treated by soaking nitric acid in the mixed solution, ...

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Abstract

The invention relates to a flexible asymmetric supercapacitor with a super high energy density and preparation thereof. According to the supercapacitor, a carbon nano tube film of which manganese dioxide nano sheets are grown on both sides is used as an anode electrode plate, a carbon nano tube film of which molybdenum disulfide nano sheets are grown on both sides is used as a cathode electrode plate, and a lithium chloride system of polyvinyl alcohol is used as an electrolyte layer; and in the preparation process, the manganese dioxide nano sheets and the molybdenum disulfide nano sheets aregrown on both sides of the carbon nano tube films respectively by an electrochemical deposition method and a hydrothermal method so as to obtain the anode electrode plate and the cathode electrode plate, then electrolyte is coated, and pressing is carried out to obtain the supercapacitor. Compared to the prior art, the flexible asymmetric supercapacitor obtained by the invention has a working voltage of 1.8V, reaches volume specific capacity of 44F cm<-3>, reaches a high energy density of 9.8mWh cm<-3>, and has a great application potentiality in the fields of a portable wearable flexible electronic device and equipment.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a flexible asymmetric supercapacitor with ultra-high energy density and a preparation method thereof. Background technique [0002] At present, portable, flexible and wearable electronic devices (such as display screens, touch screens, detectors, etc.) have attracted widespread attention from academia and industry, and have important application value and prospects in many fields. [0003] The performance and practicability of various flexible electronic products largely depend on the energy supply system, and currently widely used energy devices include secondary batteries and supercapacitors. Compared with secondary batteries, supercapacitors not only have higher power density, longer service life and more environmentally friendly characteristics, but also can be prepared into various shapes (such as fibrous, in-plane, etc.) Flexible devices or other functionalities (s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/26H01G11/30H01G11/36H01G11/46H01G11/62H01G11/84H01G11/86
CPCH01G11/26H01G11/30H01G11/36H01G11/46H01G11/62H01G11/84H01G11/86Y02E60/13
Inventor 陈涛钱贵菊吕甜李宁姚瑶
Owner TONGJI UNIV
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