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A high specific capacitance symmetric electrochemical capacitor and its preparation method

A high-capacitance, symmetrical technology, applied in the field of high-capacitance symmetric electrochemical capacitors and its preparation, to achieve high stability, simple equipment, and easy promotion

Active Publication Date: 2018-07-10
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as we know, no one has reported the bacterial cellulose-based carbon materials co-doped with nitrogen, phosphorus and sulfur.

Method used

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  • A high specific capacitance symmetric electrochemical capacitor and its preparation method
  • A high specific capacitance symmetric electrochemical capacitor and its preparation method
  • A high specific capacitance symmetric electrochemical capacitor and its preparation method

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Experimental program
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Embodiment 1

[0032] A symmetrical electrochemical capacitor with high specific capacitance includes positive and negative electrodes, electrolyte, diaphragm and current collector. The material of the positive and negative electrodes is N / P / S-PBC, wherein PBC is pyrolyzed bacterial cellulose.

[0033] At the same time, the above electrolyte is H 2 SO 4 solution, the diaphragm is made of PP / PE film, and the collector is made of stainless steel sheet.

Embodiment 2

[0035] A symmetrical electrochemical capacitor with high specific capacitance includes positive and negative electrodes, electrolyte, diaphragm and current collector. The material of the positive and negative electrodes is N / P / S-PBC, wherein PBC is pyrolyzed bacterial cellulose.

[0036] At the same time, the above electrolyte is potassium chloride solution, the diaphragm is made of filter paper, and the current collector is made of metal foil.

Embodiment 3

[0038] A preparation method of high specific capacitance symmetric electrochemical capacitor, which comprises the following steps:

[0039] Step a, prepare positive and negative electrode materials: place the diced bacterial cellulose in NH 4 h 2 PO 4 and (NH 4 ) 2 SO 4 Oscillation reaction in the mixed solution, and then freeze-drying and pyrolysis treatment to obtain positive and negative electrode materials N / P / S-PBC;

[0040] Step b, assembling the positive and negative electrodes: the positive and negative electrode materials N / P / S-PBC are separated by a diaphragm, the electrolyte is injected, and a current collector is added to the outside of the positive and negative electrode materials to obtain a symmetrical electrochemical capacitor.

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Abstract

The invention discloses a high specific capacitance symmetric electrochemical capacitor and a preparation method thereof. The symmetric electrochemical capacitor prepared by it comprises positive and negative electrodes, electrolyte solution, a diaphragm and a current collector. The material of the positive and negative electrodes is N / P / S‑PBC, where PBC is pyrolyzed bacterial cellulose. The symmetric electrochemical capacitor provided by the present invention uses cheap and abundant bacterial cellulose as the electrode raw material, and the symmetric electrochemical capacitor prepared has high specific capacitance, good cycle performance, high stability, and high energy density. Methods The anode and cathode materials with excellent electrochemical properties were obtained by a simple, effective and environmentally friendly solution impregnation method, and a symmetrical electrochemical capacitor was assembled. The equipment used was simple and easy to popularize. By adjusting the concentration of the reaction solution and the reaction time, In order 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 with high specific capacitance and a preparation method thereof. Background technique [0002] Supercapacitors are a new class of energy storage devices that have attracted widespread attention due to their high power density relative to batteries and high energy density relative to conventional dielectric capacitors. However. A major disadvantage of commercial supercapacitors is the low energy density, which limits their practical applications in certain fields. [0003] There is a lot of work to improve the energy density by using electrode materials with high capacitance in symmetric capacitors. Supercapacitors can be divided into electric double layer capacitors and pseudocapacitors, and the latter usually have higher capacitance due to the faradaic process in redox. Therefore, it is an important approach to utilize electrod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/84H01G11/86
CPCY02E60/13
Inventor 李政夏文张旭令巩继贤张美玲张健飞贾士儒
Owner TIANJIN POLYTECHNIC UNIV