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Supercapacitor redox activated electrolyte

A supercapacitor and electrolyte technology, applied in the field of electrochemical energy storage, can solve the problems of poor cycle stability, low coulombic efficiency, and difficulty in practical application, and achieve the goal of ensuring coulombic efficiency and cycle stability and improving specific capacity. Effect

Active Publication Date: 2019-06-28
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But some additives (Fe 2 (SO 4 ) 3 etc.) In the process of two-electrode testing, the charge and discharge are seriously asymmetrical, and the coulombic efficiency is very low, which is difficult for practical application. Although some additives (benzoquinone, etc.) can ensure high coulombic efficiency, the cycle stability is not good. it is good

Method used

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  • Supercapacitor redox activated electrolyte
  • Supercapacitor redox activated electrolyte
  • Supercapacitor redox activated electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of electrolyte: Dissolve 3g of concentrated sulfuric acid with a mass fraction of 98% in 30ml of water, and then add FeBr with different concentrations (0.005M, 0.01M, 0.02M, 0.03M, 0.05M, 0.1M, 0.2M) 3 After that, fully stir to prepare the electrolyte solution.

[0026] The preparation of supercapacitor: be that the polyvinylidene fluoride (PVDF) of 10% by mass percentage is dissolved in the N-2 methylpyrrolidone (NMP) earlier, stir until polyvinylidene fluoride dissolves completely, then the mass percentage is 80% Activated carbon YP-50 and conductive acetylene black with a mass percentage of 10% were poured into the slurry and stirred. After 12 hours of high-speed stirring, the active material was completely dissolved, and the slurry was in the form of a black colloid. Take 20 μL of the above slurry and evenly coat it on the On the current collector, place the coated electrode flatly in a drying oven, bake at 120°C for 5 minutes to volatilize all the N-2 ...

Embodiment 2

[0035] Electrolyte: Dissolve 4.26g of sodium sulfate in 30ml of water to get 1M Na 2 SO 4 solution, and then add different concentrations (respectively 0.005M, 0.01M, 0.02M, 0.03M, 0.05M, 0.1M) of FeBr 3 After that, fully stir to prepare the electrolyte solution. The preparation of the supercapacitor is the same as in Example 1. The electrical performance test is the same as in Example 1.

Embodiment 3

[0037] Electrolyte: Dissolve 5.22g of potassium sulfate in 30ml of water to obtain 1M K 2 SO 4 solution, and then add different concentrations (respectively 0.005M, 0.01M, 0.02M, 0.03M, 0.05M, 0.1M) of FeBr 3 After that, fully stir to prepare the electrolyte solution. The preparation of the supercapacitor is the same as in Example 1. The electrical performance test is the same as in Example 1.

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Abstract

The present invention relates to a supercapacitor redox activated electrolyte. The supercapacitor redox activated electrolyte comprises a solvent, an electrolyte and a transition metal bromide. The transition metal bromide is at least one in the group of FeBr3, CuBr2, VBr3 and CrBr3. The transition metal bromide (such as FeBr3, CuBr2, VBr3 and CrBr3) is selected as an additive of the supercapacitor electrolyte to obviously improve the capacity of the supercapacitor redox activated electrolyte and allow the supercapacitor redox activated electrolyte to show high coulombic efficiency and cyclingstability.

Description

technical field [0001] The invention relates to a redox active electrolyte for a supercapacitor, in particular to adding a soluble redox active substance by modifying the traditional supercapacitor electrolyte to increase the specific capacity of the supercapacitor and improve its energy density, belonging to the field of electrochemical energy storage. Background technique [0002] With the development of portable electronic devices and hybrid electric vehicles, people's demand for environmentally friendly high-power energy storage devices is becoming stronger and stronger. Supercapacitors, also known as electrochemical capacitors, have attracted widespread attention for their high power density, excellent cycle performance (greater than 10,000 cycles) and fast charge-discharge performance. Supercapacitors are mainly composed of electrodes, electrolytes, current collectors, diaphragms, and tabs. At present, the main research direction is to improve the specific capacity by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/64
CPCY02E60/13
Inventor 黄富强常郑王远李睿哲
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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