CN109979765A - Method based on sodium sulfite electrolyte building Asymmetric Supercapacitor - Google Patents

Method based on sodium sulfite electrolyte building Asymmetric Supercapacitor Download PDF

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CN109979765A
CN109979765A CN201711458361.0A CN201711458361A CN109979765A CN 109979765 A CN109979765 A CN 109979765A CN 201711458361 A CN201711458361 A CN 201711458361A CN 109979765 A CN109979765 A CN 109979765A
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electrolyte
sodium sulfite
asymmetric
supercapacitor
cation
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CN109979765B (en
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夏晖
孙硕
翟腾
陈琪
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/54Electrolytes
    • H01G11/58Liquid electrolytes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/54Electrolytes
    • H01G11/58Liquid electrolytes
    • H01G11/62Liquid electrolytes characterised by the solute, e.g. salts, anions or cations therein
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/84Processes for the manufacture of hybrid or EDL capacitors, or components thereof
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/13Energy storage using capacitors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

The invention discloses a kind of methods based on sodium sulfite electrolyte building Asymmetric Supercapacitor.The method separates positive electrode with negative electrode material iron oxide with cation-exchange membrane, instills electrolyte in anode portion, instills sodium sulfite electrolyte in cathode, MnO is made in encapsulation2//Fe2O3The double electrolyte Asymmetric Supercapacitors of water system.The present invention successfully limits inferior sulfate radical and enters anode, so as to avoid the oxidation process of inferior sulfate radical using the function of the barrier anion transmission of cation-exchange membrane.The supercapacitor that the present invention constructs has the general character of asymmetric super supercapacitor, has high power density, overlength cycle life, and the operating potential window with 2.6V ultra-wide.

Description

Method based on sodium sulfite electrolyte building Asymmetric Supercapacitor
Technical field
The present invention relates to the methods based on sodium sulfite electrolyte building Asymmetric Supercapacitor, belong to electrochemical energy storage Technical field.
Background technique
Supercapacitor is the new and effective secondary power supply of one kind between battery and traditional capacitance, has the circulation longevity Life length, power density height, safety, advantages of environment protection.Its power density ratio battery will be higher by 10 to 100 times, can release moment Ultrahigh current is put, therefore is highly suitable for electric vehicle.Such as supercapacitor can be with the high energy electricity such as lithium secondary battery Pond, which is used cooperatively, is used as electric vehicle, and super capacitor is used under the operating condition of the high-power output such as starting, climbing, acceleration Device can greatly improve the performance of electric vehicle.In addition, supercapacitor is alternatively arranged as backup power source, independent current source It is widely applied in fields such as communication, industry.Therefore, supercapacitor always is the hot spot of research.
Asymmetric super electric appliance is mainly made of electrode, electrolyte, diaphragm and encapsulation, and wherein electrolyte is that influence is super One of key factor of capacitor.Currently based on MnO2//Fe2O3Asymmetric super electric appliance is frequently with sodium sulphate electrolyte, but mesh Preceding report such as Adv.Funct.Mater.2016, the works such as 26,3711-3719, Nano Energy 2016,22,189-201 Make, potential window, capacitor and energy density are all extremely limited, mainly since conventional sulfuric acid sodium electrolyte cannot provide additionally Fake capacitance and sodium sulphate caused by the reasons such as stability is not strong of high potential.
Since sodium sulfite electrolyte can be used as redox electrolytes liquid, it can be additionally provided fake capacitance, and sub- Sodium sulphate electrolyte has the potential window of ultra-wide in minus zone, according to density energy formula E=1/2CV2, energy density (E) It is related with its operating potential window (V) and its capacity (C).But current sodium sulfite electrolyte can be only applied to the super electricity of symmetric form Container, voltage window V maximum can only arrive 1.2V, significantly limit the application of sodium sulfite.
Summary of the invention
It is an object of the invention to break through sodium sulfite to can be only applied to the status of symmetric form supercapacitor, by sulfurous acid Sodium electrolyte is applied on Asymmetric Supercapacitor, overcomes symmetry supercapacitor current potential window narrows, energy density low Disadvantage, the method for constructing the double electrolyte Asymmetric Supercapacitors of water system of 2.6V ultra-wide potential window, it has high simultaneously Capacity, excellent cycle life, 2.6V ultra-wide operating potential window, high energy density and low cost and good safety The features such as energy.
The technical solution of the present invention is as follows:
Based on the method for sodium sulfite electrolyte building Asymmetric Supercapacitor, sulfurous is obstructed using cation-exchange membrane Sour sodium enters anode, prepares double electrolyte asymmetric type supercapacitors, the specific steps are as follows:
Positive electrode is separated with negative electrode material iron oxide with cation-exchange membrane, instills electrolyte in anode portion, Cathode instills sodium sulfite electrolyte, and MnO is made in encapsulation2//Fe2O3The double electrolyte Asymmetric Supercapacitors of water system.
The positive electrode can be conventional use of any positive electrode, can be manganese oxide, ruthenium-oxide, cobalt oxide Deng.
Preferably, the negative electrode material is the composite material or nanometer rods iron oxide of iron oxide quantum dot and graphene.
The electrolyte of the anode portion can be neutral, acid, alkaline electrolyte, specifically can be sodium sulphate, hydrogen Potassium oxide, dilute sulfuric acid electrolyte.
Preferably, the concentration of the sodium sulfite electrolyte is 0.2M-2M.
Preferably, the cation-exchange membrane can be CMI7000.
Supercapacitor is by polarized electrolytic matter come energy storage, and by being powered on pole plate, positive plate attracts in electrolyte Anion, negative plate attract cation, actually form two capacitive accumulation layers, the cation being separated is attached in negative plate Closely, anion is near positive plate.
Compared with prior art, advantages of the present invention is as follows:
(1) sodium sulfite electrolyte can be additionally provided fake capacitance, and sodium sulfite as redox electrolytes liquid Electrolyte has the potential window of ultra-wide in minus zone, to construct the supercapacitor of ultra high energy density.
(2) breaking through sodium sulfite can be only applied to the status for forming supercapacitor, and sodium sulfite electricity is successfully utilized The advantages of solving liquid high capacity high potential window, the asymmetric type supercapacitor being assembled into can be worked normally in 2.6V, for height The development of energy density supercapacitor is of great significance.
(3) present invention is using double electrolyte, the situation different suitable for all kinds of positive and negative anodes electrolyte, and can make in this way Positive and negative pole material utilization rate reaches maximization, there is important promotion to make the development of double electrolyte Asymmetric Supercapacitors With.
Detailed description of the invention
Fig. 1 is the cyclic voltammetry curve based on sodium sulfite Yu sodium sulphate electrolyte different potentials in embodiment 1.
Fig. 2 is in embodiment 1 based on sodium sulfite and sodium sulphate electrolyte 2.6V charging and discharging curve.
Fig. 3 is the circulation longevity based on iron oxide cathode Yu double electrolyte Asymmetric Supercapacitor devices of manganese oxide anode Life figure.
Fig. 4 is that double electrolyte Asymmetric Supercapacitor device architectures based on iron oxide cathode and manganese oxide anode are illustrated Figure.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and examples:
The cation-exchange membrane that embodiment uses commercially available can obtain, model CMI7000.
Embodiment 1
The preparation of first step manganese oxide: 0.15g potassium permanganate is dissolved in 40 water, then 100 DEG C of hydro-thermal 10h, success Prepare the manganese oxide nanometer sheet grown on carbon cloth.
Step 2: the preparation of iron oxide quantum dot: by the functional graphene of the ferric nitrate of 0.5g and 0.05g in 30ml alcohol Stirring is to dry in solution, and the compound of iron oxide quantum dot and graphene is then resolved at 200 DEG C.
Step 3: the assembling of the double electrolyte Asymmetric Supercapacitors of water system: using aluminum plastic film and sealant by sun from Proton exchange is fixed up with cathode sealing, and sodium sulfite electrolyte is instilled cathode portion from reserved opening.It then again will oxidation Manganese is fixed on cation-exchange membrane another side, and three sides are sealed with sealant and aluminum plastic film, instills sodium sulphate electrolyte, finally Device is assembled by hot sealing.
By test, Fig. 1 is the cyclic voltammetry curve based on sodium sulfite Yu sodium sulphate electrolyte different potentials, can be seen Out, this device can be operated normally in 2.6V.Fig. 2 device normal charging and discharging curve of 2.6V again thus, showing can be just in 2.6V Often work.Fig. 3 is the cycle life figure of device, it can be seen that sweeps speed in height based on the Asymmetric Supercapacitor of sodium sulfite Under, capacity remains to reach 105F/g, 2000 circle of circulation, and capacity retention ratio is up to 93.2%.Fig. 4 is the photomacrograph and knot of device Structure schematic diagram.
Embodiment 2
The preparation of first step manganese oxide: 0.15g potassium permanganate is dissolved in 40 water, then 100 DEG C of hydro-thermal 10h, success Prepare the manganese oxide nanometer sheet grown on carbon cloth.
Step 2: the preparation of nanometer rods iron oxide: the iron chloride of 0.54g and 0.284g sodium sulphate being dissolved in water, so After be transferred in water heating kettle, be put into carbon cloth carry out 120 DEG C of 10h hydro-thermal, then under air anneal 400 DEG C of 1h, successfully prepare Ferric oxide nano rod out.
Step 3: the assembling of the double electrolyte Asymmetric Supercapacitors of water system: using aluminum plastic film and sealant by sun from Proton exchange is fixed up with cathode sealing, and sodium sulfite electrolyte is instilled cathode portion from reserved opening.It then again will oxidation Manganese is fixed on cation-exchange membrane another side, and three sides are sealed with sealant and aluminum plastic film, instills sodium sulphate electrolyte, finally Device is assembled by hot sealing.
By test, device can work in 2.6V normal operation, and since 3 material of electrode is flexible, Ke Yiying For flexible electronic device.
Embodiment 3
The preparation of first step manganese oxide: 0.15g potassium permanganate is dissolved in 40 water, then 100 DEG C of hydro-thermal 10h, success Prepare the manganese oxide nanometer sheet grown on carbon cloth.
Step 2: the preparation of iron oxide quantum dot: by the functional graphene of the ferric nitrate of 0.5g and 0.05g in 30ml alcohol Stirring is to dry in solution, and the compound of iron oxide quantum dot and graphene is then resolved at 200 DEG C.
Step 3: the assembling of the double electrolyte Asymmetric Supercapacitors of water system: using aluminum plastic film and sealant by sun from Proton exchange is fixed up with cathode sealing, and sodium sulfite electrolyte is instilled cathode portion from reserved opening.It then again will oxidation Manganese is fixed on cation-exchange membrane another side, and three sides are sealed with sealant and aluminum plastic film, instills NaOH electrolyte, most Device is assembled by hot sealing afterwards.
Embodiment 4
The preparation of first step manganese oxide: 0.15g potassium permanganate is dissolved in 40 water, then 100 DEG C of hydro-thermal 10h, success Prepare the manganese oxide nanometer sheet grown on carbon cloth.
Step 2: the preparation of iron oxide quantum dot: by the functional graphene of the ferric nitrate of 0.5g and 0.05g in 30ml alcohol Stirring is to dry in solution, and the compound of iron oxide quantum dot and graphene is then resolved at 200 DEG C.
Step 3: the assembling of the double electrolyte Asymmetric Supercapacitors of water system: using aluminum plastic film and sealant by sun from Proton exchange is fixed up with cathode sealing, and sodium sulfite electrolyte is instilled cathode portion from reserved opening.It then again will oxidation Manganese is fixed on cation-exchange membrane another side, and three sides are sealed with sealant and aluminum plastic film, instills dilute sulfuric acid electrolyte, finally Device is assembled by hot sealing.

Claims (8)

1. the method based on sodium sulfite electrolyte building Asymmetric Supercapacitor, which is characterized in that specific step is as follows:
Positive electrode is separated with negative electrode material iron oxide with cation-exchange membrane, electrolyte is instilled in anode portion, in cathode Sodium sulfite electrolyte is instilled, MnO is made in encapsulation2//Fe2O3The double electrolyte Asymmetric Supercapacitors of water system.
2. the method according to claim 1, wherein the positive electrode is selected from manganese oxide, ruthenium-oxide or oxygen Change cobalt.
3. the method according to claim 1, wherein the negative electrode material is selected from iron oxide quantum dot and graphite The composite material or nanometer rods iron oxide of alkene.
4. the method according to claim 1, wherein the electrolyte of the anode portion is selected from neutral, acidity Or alkaline electrolyte.
5. according to the method described in claim 4, it is characterized in that, the electrolyte of the anode portion is selected from sodium sulphate, hydrogen Potassium oxide or dilute sulfuric acid electrolyte.
6. the method according to claim 1, wherein the concentration of the sodium sulfite electrolyte is 0.2M-2M.
7. the method according to claim 1, wherein preferably, the cation-exchange membrane is CMI7000.
8. the asymmetric super capacitor based on sodium sulfite electrolyte made from method according to any one of claims 1 to 7 Device.
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Cited By (1)

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CN113113676A (en) * 2021-03-29 2021-07-13 南京理工大学 Method for expanding voltage of water system energy storage device by introducing competitive type oxidation-reduction reaction

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