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Preparation method of supercapacitor

A supercapacitor, gel electrolyte technology, applied in the direction of hybrid/electric double layer capacitor manufacturing, hybrid capacitor electrodes, nanotechnology for materials and surface science, etc., can solve unsatisfactory charge storage capacity, specific capacitance and Problems such as low energy density and unsatisfactory charge-discharge stability have achieved the effects of facilitating large-scale development and application, excellent rate performance, excellent rate performance and repeated charge-discharge stability

Active Publication Date: 2019-05-21
深圳特新界面科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the charge storage capacity of most of the reported flexible electrodes and flexible supercapacitors is still unsatisfactory, for example, the specific capacitance and energy density are still not high, the rate performance is relatively poor, and the charge and discharge stability is not ideal, etc. Reality

Method used

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  • Preparation method of supercapacitor
  • Preparation method of supercapacitor
  • Preparation method of supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method for a flexible composite film for supercapacitors, as follows:

[0029] The previously developed cellulose / graphene / silver nanoparticle film was cut into 0.5 cm × 3 cm rectangular strips, and then immersed in a temperature of 60 o C at a concentration of 10 mM FeSO 4 in the aqueous solution for 30 s, then quickly removed and placed at a temperature of 60 o The concentration of C is 20 mM KOH aqueous solution for 30 s, which is 1 deposition cycle. According to this method, after we repeatedly and alternately deposit 60 cycles, we can deposit γ-crystalline ferric oxide nanoparticles on the cellulose / graphene / silver nanoparticle film to obtain cellulose / graphene / silver nanoparticle film. Particle / Fe2O3 composite film.

[0030] Use it directly as a flexible electrode for electrochemical testing:

[0031] (1) The above-prepared cellulose / graphene / silver nanoparticles / ferric oxide composite film was taken out from the solution, then washed repeatedly ...

Embodiment 2

[0036] A kind of preparation of supercapacitor, make according to the following steps:

[0037] 1. Preparation of polyvinyl alcohol / potassium hydroxide gel electrolyte: Add 6 g of polyvinyl alcohol to 60 mL of water, raise the temperature to 90°C, stir for 30 minutes to dissolve it, and then cool naturally to 20°C. Next slowly add 3 mL of 2 gmL dropwise with stirring −1 The aqueous solution of potassium hydroxide is stirred evenly to obtain a clear and transparent polyvinyl alcohol / potassium hydroxide gel electrolyte;

[0038] 2. the preparation of the cellulose / graphene / silver nanoparticle / ferric oxide film that contains gel film: the cellulose / graphene / silver nanoparticle / ferric oxide composite film that make in embodiment 1 is cut A rectangular strip with a size of 0.5 cm × 3 cm was placed on a glass slide, and then the polyvinyl alcohol / potassium hydroxide gel electrolyte was poured on its surface, leaving a blank area of ​​0.5 cm × 1 cm for contact with the electrode cl...

Embodiment 3

[0041] A kind of preparation of supercapacitor, make according to the following steps:

[0042] 1. Preparation of polyvinyl alcohol / potassium hydroxide gel electrolyte: Add 6 g of polyvinyl alcohol to 60 mL of water, raise the temperature to 85°C, stir for 35 minutes to dissolve it, and then cool naturally to 25°C. Next slowly add 3 mL of 2 gmL dropwise with stirring −1 The aqueous solution of potassium hydroxide is stirred evenly to obtain a clear and transparent polyvinyl alcohol / potassium hydroxide gel electrolyte;

[0043] 2. the preparation of the cellulose / graphene / silver nanoparticle / ferric oxide film that contains gel film: the cellulose / graphene / silver nanoparticle / ferric oxide composite film that make in embodiment 1 is cut A rectangular strip with a size of 0.5 cm × 3 cm was placed on a glass slide, and then the polyvinyl alcohol / potassium hydroxide gel electrolyte was poured on its surface, leaving a blank area of ​​0.5 cm × 1 cm for contact with the electrode cl...

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Abstract

The invention discloses a preparation method of a supercapacitor. The supercapacitor is prepared by taking polyvinyl alcohol, potassium hydroxide, a cellulose / graphene / silver nanoparticle / iron sesquioxide composite thin film as raw materials through the steps of preparing polyvinyl alcohol / potassium hydroxide gel electrolyte, preparing a gel film-containing cellulose / graphene / silver nanoparticle / iron sesquioxide thin film, and preparing a symmetric all-solid-state flexible supercapacitor. The supercapacitor is assembled by taking the cellulose / graphene / silver nanoparticle / iron sesquioxide flexible composite thin film as anode and cathode, so that the supercapacitor has enough toughness, the bending state does not influence the electrochemical behaviors, the supercapacitor has high energy density, rate capability and repeated charging / discharging stability, and the supercapacitor can be connected in series or parallel to serve as a power supply for driving small electronic equipment towork.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a preparation method of a supercapacitor. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, electric double layer capacitors, gold capacitors, and farad capacitors, are electrochemical components developed in the 1970s and 1980s to store energy through polarized electrolytes. It is different from traditional chemical power sources. It is a power source with special properties between traditional capacitors and batteries. It mainly relies on electric double layers and redox pseudocapacitive charges to store electrical energy. However, no chemical reaction occurs in the process of its energy storage. This energy storage process is reversible, and it is precisely because this supercapacitor can be repeatedly charged and discharged hundreds of thousands of times. [0003] Thin and portable flexible electronic products, such a...

Claims

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Application Information

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IPC IPC(8): H01G11/84H01G11/86H01G11/24H01G11/30H01G11/36H01G11/32B82Y30/00B82Y40/00
CPCY02E60/13
Inventor 肖巍邹章华周文杰张艳华
Owner 深圳特新界面科技有限公司
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