CN110137451A - A kind of iron-based electrode of adhesive-free and the preparation method and application thereof - Google Patents

A kind of iron-based electrode of adhesive-free and the preparation method and application thereof Download PDF

Info

Publication number
CN110137451A
CN110137451A CN201910344166.8A CN201910344166A CN110137451A CN 110137451 A CN110137451 A CN 110137451A CN 201910344166 A CN201910344166 A CN 201910344166A CN 110137451 A CN110137451 A CN 110137451A
Authority
CN
China
Prior art keywords
iron
adhesive
free
electrode
based electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910344166.8A
Other languages
Chinese (zh)
Inventor
吴卓颖
曾艳娴
王卫星
雷栋均
高瑜敏
许彤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
South China University of Technology SCUT
Original Assignee
South China University of Technology SCUT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by South China University of Technology SCUT filed Critical South China University of Technology SCUT
Priority to CN201910344166.8A priority Critical patent/CN110137451A/en
Publication of CN110137451A publication Critical patent/CN110137451A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M12/00—Hybrid cells; Manufacture thereof
    • H01M12/08—Hybrid cells; Manufacture thereof composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention belongs to the technical field of electrochemical material, a kind of iron-based electrode of adhesive-free and the preparation method and application thereof is disclosed.Method: 1) polyacrylonitrile wiring solution-forming is obtained by polyacrylonitrile solution using organic solvent；2) ferriferous oxide is uniformly mixed with conductive materials, obtains powder activity substance；The ferriferous oxide is more than one in ferroso-ferric oxide or ferric oxide；The conductive materials are acetylene black, active carbon or graphene；3) polyacrylonitrile solution and powder activity substance are mixed, demulsification obtains coating material；4) coating material is dried coated on carrier, then compacting is pyrolyzed in an inert atmosphere, obtain the iron-based electrode of adhesive-free.Method of the invention is simple, and raw material is easy to get；It obtains stable iron-based electrode structure and capacity with higher and cyclical stability, improves the performance of existing adhesive-free iron electrode.The iron-based electrode of adhesive-free is used for rechargeable battery and/or supercapacitor.

Description

A kind of iron-based electrode of adhesive-free and the preparation method and application thereof
Technical field
The invention belongs to electrochemical material technical fields, and in particular to a kind of iron-based electrode of adhesive-free (i.e. carbon structure packet Cover ferrous oxide electrode material) and the preparation method and application thereof.
Background technique
Due to iron have it is safe and non-toxic, environmental-friendly, cheap, be easy to aoxidize, oxide is various and can be electrolysed In matter the features such as electro-deposition, it is considered as a kind of electrode material of great potential that can be used for rechargeable battery and supercapacitor. The open-circuit voltage of iron-air cell is 1.28V, theoretical energy density 764Wh/Kg.It can pole by using auxiliary air electrode The big specific energy density for improving battery, thus requiring the high-performance iron sky secondary cell of potentiality with the energy storage of grid specification is most to have Possible large-scale application is in one of the electrochemical kinetics of tractive force.The critical component of iron sky secondary cell first is that iron electrode, is adopted It uses cheap iron as raw material, not only there is quite high energy density, and dendrite will not be generated in cyclic process, thus With good cyclical stability.But there are also some disadvantages for iron electrode at present, since liberation of hydrogen causes charge efficiency lower, need Want overcharge that can just reach full load condition, and will form insulation ferrous hydroxide cause heavy-current discharge when can drop Low battery voltages slow down discharge rate.And binder free iron electrode most at present can cause Fe/ when carrying out electrochemistry circulation FeOxDissolution and reprecipitation outside active material particle surface, hinder the practical application of iron electrode significantly.
The preparation of iron electrode at present is by obtaining active material in conjunction with current collector layer.Make active material and current collector layer knot The method of conjunction has infusion process, coating process, growth method, sedimentation etc..The load capacity of infusion process is lower, the work of growth method and sedimentation Skill is complex, and the technique of coating process is relatively easy, and load capacity is considerable.But coating process needs to guarantee using binder Electrode has certain mechanical strength, and the electric conductivity of general binder is general, needs additionally to add conductive materials to ensure to lead Electrically, it causes the ratio of active material accordingly to reduce, significantly reduces the capacity of electrode.
Summary of the invention
In order to overcome the shortcomings and deficiencies of the prior art, the purpose of the present invention is to provide a kind of iron-based electrodes of adhesive-free And preparation method thereof.The iron-based electrode material of adhesive-free of the invention is cheap and easy to get, and preparation method is simple, obtains iron-based electrode Stable structure and capacity with higher and cyclical stability, solve and polytetrafluoroethylene (PTFE) are used to prepare iron as adhesive The defects of electrode bring iron electrode poorly conductive, improve the cycle performance of existing adhesive-free iron electrode.
Another object of the present invention is to provide the applications of the iron-based electrode of above-mentioned adhesive-free.The iron-based electricity of adhesive-free Pole is used for rechargeable battery and supercapacitor, especially iron sky secondary cell.
The purpose of the present invention is achieved through the following technical solutions:
A kind of preparation method of the iron-based electrode of adhesive-free, comprising the following steps:
1) polyacrylonitrile wiring solution-forming is obtained by polyacrylonitrile solution using organic solvent；
2) ferriferous oxide is uniformly mixed with conductive materials, obtains powder activity substance；The ferriferous oxide is four oxygen Change more than one in three-iron or ferric oxide；The conductive materials are acetylene black, active carbon or graphene；
3) polyacrylonitrile solution and powder activity substance are mixed, demulsification obtains coating material；
4) coating material is dried coated on carrier, then compacting is pyrolyzed in an inert atmosphere, obtain adhesive-free iron Base electrode.
Organic solvent described in step 1) is more than one in N,N-dimethylformamide or dimethyl sulfoxide；Polyacrylonitrile The mass concentration of polyacrylonitrile is 2%~10% in solution.
The mass ratio of ferriferous oxide described in step 2) and conductive materials is (1~3.5): 1；The partial size of the ferriferous oxide For 20~300nm.
Ferriferous oxide is ground after mixing with conductive materials, and the partial size of powder is 20~500nm.
The mass ratio of polyacrylonitrile and powder activity substance is (2~5): (8~5) in polyacrylonitrile solution in step 3), Polyacrylonitrile accounts for the total amount 20%~50% of polyacrylonitrile and active material.
The demulsifying agent of demulsification described in step 3) is dehydrated alcohol or ether；The additional amount of demulsifying agent is polyacrylonitrile solution 1~1.2 times of quality.
Carrier described in step 4) is nickel screen, titanium net, stainless (steel) wire, titanium foil or copper foil；
The temperature of the step 4) drying is 40~80 DEG C, and the time is 2~12 hours；The pressure of the compacting be 20~ 50MPa。
Inert atmosphere described in step 4) (i.e. protectiveness atmosphere) is argon atmosphere or nitrogen atmosphere；
The temperature of pyrolysis described in step 4) is 230~1000 DEG C, preferably 400~700 DEG C；The pyrolysis time is 0.5~5h.
The iron-based electrode of adhesive-free is prepared by the above method.
The iron-based electrode of adhesive-free is used for rechargeable battery and supercapacitor, especially iron sky secondary cell.
Polyacrylonitrile pyrolysis in the present invention can form trapezoidal cyclized structure and stone riprap layer of ink with high electrical conductivity Structure.In addition, the hole that there is the polyacrylonitrile after pyrolysis more multipair storage charge to play an important role.High porosity and Bi Biao Area contacts iron more fully with electrolysis mass-energy, but also effectively inhibits the dissolution and reprecipitation of iron, substantially increases The structural stability and cyclical stability of binder free electrode.
Compared with prior art, the invention has the following advantages that
1) carbon structure formed after PAN pyrolysis in the iron-based electrode of adhesive-free of the invention is when playing the role of binder The capacity of electrode can also be effectively increased, porous carbon structure not only provides electronics and ion conduction channel, but also effectively inhibits The dissolution and reprecipitation of iron substantially increase the structural stability and cyclical stability of binder free electrode.
2) raw material of the iron-based electrode of adhesive-free of the invention is cheap and easy to get, and preparation method is simple.
In short, the present invention obtains iron-based electrode structure stabilization and capacity with higher and cyclical stability, solution It is viscous to improve existing nothing for the defects of using polytetrafluoroethylene (PTFE) to prepare iron electrode bring iron electrode poorly conductive as adhesive The cycle performance of mixture iron electrode.
Detailed description of the invention
Fig. 1 is following for traditional PTFE binder iron electrode of the iron-based electrode of adhesive-free made from embodiment 1 and comparative example 1 Ring volt-ampere curve comparison diagram；
Fig. 2 is the perseverance of traditional PTFE binder iron electrode of the iron-based electrode of adhesive-free made from embodiment 1 and comparative example 1 Flow charging and discharging curve comparison diagram；
Fig. 3 is the electricity of traditional PTFE binder iron electrode of the iron-based electrode of adhesive-free made from embodiment 1 and comparative example 1 Chemical impedance spectral curve；
Fig. 4 is the constant current charge-discharge curve of iron electrode prepared by embodiment 2,3 and comparative example 2；
Fig. 5 is the constant current charge-discharge curve of iron electrode prepared by embodiment 2,4,5 and comparative example 1；
Fig. 6 is the constant current charge-discharge curve of iron electrode prepared by embodiment 3,6,7 and comparative example 2；
Fig. 7 is the constant current charge-discharge curve of iron electrode prepared by embodiment 8 and comparative example 3；
Fig. 8 is the constant current charge-discharge curve of iron electrode prepared by embodiment 9 and comparative example 4.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below, but embodiments of the present invention are not limited to This.
Embodiment 1
1) 0.25gPAN is weighed, dissolves PAN using 9.75gDMF solution, outfit mass concentration is 2.5%PAN solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen, obtain active ingredient carriers；
3) 5mg ferroso-ferric oxide (ferroso-ferric oxide partial size is 20nm) and 2mg acetylene black are weighed respectively, by ferroso-ferric oxide And acetylene black is uniformly mixed and is ground in mortar, obtains the mixture of active material；120mg mass is added into mixture Percentage is 2.5%PAN solution, obtains the slurries of black；Then 120mg ethyl alcohol is added, makes the droplet conglomerate of lotion, Form the slurries for being easy to apply；Slurries are applied on nickel screen, surface covered is 1cm × 1cm, after drying 2h at 80 DEG C, in 20MPa Pressure lower sheeting；Inert gas discharge air is passed first into furnace, is further continued for flow velocity being the lazy of 200~300ml/min Property gas is passed through in furnace；In-furnace temperature is first gradually heated to 500 DEG C by the speed of 5 DEG C/min by room temperature under an argon atmosphere, then The temperature is kept to be pyrolyzed 2 hours, the iron-based electrode (Fe of adhesive-free is made in last cooled to room temperature3O4@AB@PAN)。
Embodiment 2
1) 0.25gPAN (polyacrylonitrile is 150,000 molecular weight) is weighed, PAN is dissolved using 9.75gDMF solution, is equipped with 2.5%PAN solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen；
3) 5mg ferroso-ferric oxide (ferroso-ferric oxide partial size is 20nm) and 3mg acetylene black are weighed respectively, by ferroso-ferric oxide And acetylene black is uniformly mixed and is ground in mortar, obtains the mixture of active material；80mg mass percent, which is added, is 2.5%PAN solution obtains the slurries of black, and 80mg ethyl alcohol is then added, makes the droplet conglomerate of lotion, formation is easy to The slurries of coating；Slurries are applied on nickel screen, surface covered is 1cm × 1cm, after drying 2h at 80 DEG C, under the pressure of 20MPa Tabletting；Inert gas discharge air is passed first into furnace, is further continued for leading to the inert gas that flow velocity is 200~300ml/min Enter in furnace；In-furnace temperature is first gradually heated to 550 DEG C by the speed of 5 DEG C/min by room temperature under an argon atmosphere, then keeps the temperature Iron-based electrode (the Fe of adhesive-free is made in degree pyrolysis 2 hours, last cooled to room temperature3O4@AB@PAN)。
Embodiment 3
1) 0.25gPAN (polyacrylonitrile is 150,000 molecular weight) is weighed, PAN is dissolved using 9.75gDMF solution, is equipped with 2.5%PAN solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen (with a thickness of 1.5 millimeters), as active material Carrier；
3) 5mg ferroso-ferric oxide (ferroso-ferric oxide partial size is 20nm) and 3mg acetylene black are uniformly mixed and are ground, obtained The mixture of active material；Addition 80mg mass percent is 2.5%PAN solution, obtains the slurries of black, 80mg is then added Ethyl alcohol makes the droplet conglomerate of lotion, forms the slurries for being easy to apply；Slurries are applied on nickel screen, surface covered 1cm × 1cm, after drying 2h at 80 DEG C, in the pressure lower sheeting of 20MPa；Inert gas discharge air is passed first into furnace, followed by It is continuous that the inert gas that flow velocity is 200~300ml/min is passed through in furnace；In-furnace temperature under an argon atmosphere first by room temperature by 5 DEG C/ The speed of min is gradually heated to 550 DEG C, then the temperature is kept to be pyrolyzed 1 hour, and last cooled to room temperature is made without bonding Iron-based electrode (the Fe of agent3O4@AB@PAN)。
Embodiment 4
1) 0.25gPAN is weighed, PAN is dissolved using 9.75gDMF solution, is equipped with 2.5%PAN solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen, obtain active ingredient carriers；
3) by 5mg ferroso-ferric oxide (ferroso-ferric oxide partial size is 20nm), 2mg acetylene black is uniformly mixed and is ground in mortar Mill, obtains the mixture of active material；Addition 120mg mass percent is 2.5%PAN solution, obtains the slurries of black, then 120mg ethyl alcohol is added, makes the droplet conglomerate of lotion, forms the slurries for being easy to apply；Slurries are applied on nickel screen, are applied Area is 1cm × 1cm, after drying 2h at 80 DEG C, in the pressure lower sheeting of 20MPa；Inert gas discharge is passed first into furnace Air is further continued for for the inert gas that flow velocity is 200~300ml/min being passed through in furnace；In-furnace temperature under an argon atmosphere first by Room temperature is gradually heated to 550 DEG C by the speed of 5 DEG C/min, then the temperature is kept to be pyrolyzed 2 hours, last cooled to room temperature, Iron-based electrode (the Fe of adhesive-free is made3O4@AB@PAN)。
Embodiment 5
1) 0.25gPAN is weighed, PAN is dissolved using 9.75gDMF solution, is equipped with 2.5%PAN solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen, obtain active ingredient carriers；
3) by 6mg ferroso-ferric oxide (ferroso-ferric oxide partial size is 20nm), 2mg acetylene black is uniformly mixed and is ground in mortar Mill, obtains the mixture of active material；Addition 80mg mass percent is 2.5%PAN solution, obtains the slurries of black, then 80mg ethyl alcohol is added, makes the droplet conglomerate of lotion, forms the slurries for being easy to apply；Slurries are applied on nickel screen, are applied Area is 1cm × 1cm, after drying 2h at 80 DEG C, in the pressure lower sheeting of 20MPa；Inert gas discharge is passed first into furnace Air is further continued for for the inert gas that flow velocity is 200~300ml/min being passed through in furnace；In-furnace temperature under an argon atmosphere first by Room temperature is gradually heated to 550 DEG C by the speed of 5 DEG C/min, then the temperature is kept to be pyrolyzed 2 hours, last cooled to room temperature, Iron-based electrode (the Fe of adhesive-free is made3O4@AB@PAN)。
Embodiment 6
1) 0.25gPAN is weighed, PAN is dissolved using 9.75gDMF solution, is equipped with 2.5%PAN solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen, obtain active ingredient carriers；
3) by 5mg ferroso-ferric oxide (ferroso-ferric oxide partial size is 20nm), 3mg acetylene black is uniformly mixed and is ground in mortar Mill, obtains the mixture of active material；Addition 80mg mass percent is 2.5%PAN solution, obtains the slurries of black, then 80mg ethyl alcohol is added, makes the droplet conglomerate of lotion, forms the slurries for being easy to apply；Slurries are applied on nickel screen, are applied Area is 1cm × 1cm, after drying 2h at 80 DEG C, in the pressure lower sheeting of 20MPa；Inert gas discharge is passed first into furnace Air is further continued for for the inert gas that flow velocity is 200~300ml/min being passed through in furnace；In-furnace temperature under an argon atmosphere first by Room temperature is gradually heated to 400 DEG C by the speed of 5 DEG C/min, then the temperature is kept to be pyrolyzed 1 hour, last cooled to room temperature, Iron-based electrode (the Fe of adhesive-free is made3O4@AB@PAN)。
Embodiment 7
1) 0.25gPAN is weighed, PAN is dissolved using 9.75gDMF solution, is equipped with 2.5%PAN solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen, obtain active ingredient carriers；
3) by 5mg ferroso-ferric oxide (ferroso-ferric oxide partial size is 20nm), 3mg acetylene black is uniformly mixed and is ground in mortar Mill, obtains the mixture of active material；Addition 80mg mass percent is 2.5%PAN solution, obtains the slurries of black, then 80mg ethyl alcohol is added, makes the droplet conglomerate of lotion, forms the slurries for being easy to apply；Slurries are applied on nickel screen, are applied Area is 1cm × 1cm, after drying 2h at 80 DEG C, in the pressure lower sheeting of 20MPa；Inert gas discharge is passed first into furnace Air is further continued for for the inert gas that flow velocity is 200~300ml/min being passed through in furnace；In-furnace temperature under an argon atmosphere first by Room temperature is gradually heated to 700 DEG C by the speed of 5 DEG C/min, then the temperature is kept to be pyrolyzed 1 hour, last cooled to room temperature, Iron-based electrode (the Fe of adhesive-free is made3O4@AB@PAN)。
Embodiment 8
1) 0.25gPAN is weighed, PAN is dissolved using 9.75gDMF solution, is equipped with 2.5%PAN solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen, obtain active ingredient carriers；
3) by 5mg ferroso-ferric oxide (ferroso-ferric oxide partial size is 300nm), 3mg acetylene black is uniformly mixed simultaneously in mortar Grinding, obtains the mixture of active material；Addition 80mg mass percent is 2.5%PAN solution, obtains the slurries of black, so 80mg ethyl alcohol is added afterwards, makes the droplet conglomerate of lotion, forms the slurries for being easy to apply；Slurries are applied on nickel screen, are applied Surface application product is 1cm × 1cm, after drying 2h at 80 DEG C, in the pressure lower sheeting of 20MPa；Inert gas row is passed first into furnace Air out is further continued for for the inert gas that flow velocity is 200~300ml/min being passed through in furnace；In-furnace temperature is first under an argon atmosphere 550 DEG C are gradually heated to by the speed of 5 DEG C/min by room temperature, then the temperature is kept to be pyrolyzed 2 hours, finally naturally cools to room Iron-based electrode (the Fe of adhesive-free is made in temperature3O4@AB@PAN)。
Embodiment 9
1) 0.25gPAN is weighed, PAN is dissolved using 9.75gDMF solution, is equipped with 2.5%PAN solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen, obtain active ingredient carriers；
3) by 5mg di-iron trioxide (di-iron trioxide partial size is 30nm), 3mg acetylene black is uniformly mixed and is ground in mortar Mill, obtains the mixture of active material；Addition 80mg mass percent is 2.5%PAN solution, obtains the slurries of black, then 80mg ethyl alcohol is added, makes the droplet conglomerate of lotion, forms the slurries for being easy to apply；Slurries are applied on nickel screen, are applied Area is 1cm × 1cm, after drying 2h at 80 DEG C, in the pressure lower sheeting of 20MPa；Inert gas discharge is passed first into furnace Air is further continued for for the inert gas that flow velocity is 200~300ml/min being passed through in furnace；In-furnace temperature under an argon atmosphere first by Room temperature is gradually heated to 550 DEG C by the speed of 5 DEG C/min, then the temperature is kept to be pyrolyzed 2 hours, last cooled to room temperature, Iron-based electrode (the Fe of adhesive-free is made2O3@AB@PAN)。
Comparative example 1
1) 1g polytetrafluoroethylene (PTFE) (PTFE) is weighed, PTFE is dissolved using 9gDMF solution, is equipped with 10wt%PTFE solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen, obtain active ingredient carriers；
3) weigh 5mg ferroso-ferric oxide (ferroso-ferric oxide 20nm) respectively, 3mg acetylene black, by ferroso-ferric oxide and Acetylene black is uniformly mixed and is ground in mortar, obtains the mixture of active material；It is 10% that 20mg mass percent, which is added, PTFE solution obtains the slurries of black, and 20mg ethyl alcohol is then added, and makes the droplet conglomerate of lotion, and formation is easy to apply Slurries；Slurries are applied on nickel screen, surface covered is 1cm × 1cm, after drying 2h at 80 DEG C, is pushed in the pressure of 20MPa The iron-based electrode of adhesive-free is made in piece.
Comparative example 2
1) 0.25gPAN is weighed, PAN is dissolved using 9.75gDMF solution, is equipped with 2.5%PAN solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen, obtain active ingredient carriers；
3) by 5mg ferroso-ferric oxide (ferroso-ferric oxide 20nm), 3mg acetylene black is uniformly mixed and is ground in mortar, Obtain the mixture of active material；Addition 80mg mass percent is 2.5%PAN solution, obtains the slurries of black, is then added 80mg ethyl alcohol makes the droplet conglomerate of lotion, forms the slurries for being easy to apply；Slurries are applied on nickel screen, surface covered For 1cm × 1cm, after drying 2h at 80 DEG C, in the pressure lower sheeting of 20MPa, the iron-based electrode of adhesive-free is made.
Comparative example 3
1) 1g polytetrafluoroethylene (PTFE) (PTFE) is weighed, PTFE is dissolved using 9gDMF solution, is equipped with 10wt%PTFE solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen, obtain active ingredient carriers；
3) by 5mg ferroso-ferric oxide (ferroso-ferric oxide 300nm), 3mg acetylene black is uniformly mixed and is ground in mortar, Obtain the mixture of active material；Addition 20mg mass percent is 10%PTFE solution, obtains the slurries of black, is then added 20mg ethyl alcohol makes the droplet conglomerate of lotion, forms the slurries for being easy to apply；Slurries are applied on nickel screen, surface covered is After drying 2h at 80 DEG C, in the pressure lower sheeting of 20MPa, the iron-based electrode of adhesive-free is made in 1cm × 1cm.
Comparative example 4
1) 1g polytetrafluoroethylene (PTFE) (PTFE) is weighed, PTFE is dissolved using 9gDMF solution, is equipped with 10wt%PTFE solution；
2) it is 2cm that cut size specification, which is 1cm × 2cm area,2Nickel screen, obtain active ingredient carriers；
3) 5mg di-iron trioxide (di-iron trioxide 30nm) and 3mg acetylene black are uniformly mixed in mortar and are ground, Obtain the mixture of active material；Addition 20mg mass percent is 10%PTFE solution, obtains the slurries of black, is then added 20mg ethyl alcohol makes the droplet conglomerate of lotion, forms the slurries for being easy to apply；Slurries are applied on nickel screen, surface covered is After drying 2h at 80 DEG C, in the pressure lower sheeting of 20MPa, the iron-based electrode of adhesive-free is made in 1cm × 1cm.
Performance test:
S1: iron electrode prepared by embodiment 1 and comparative example is subjected to electrode performance test:
(1) cyclic voltammetry: head is -1.2 in scanning potential range using the electrochemical workstation of model chi660e ~-0.2V, scanning speed are respectively to carry out cyclic voltammetry to electrode obtained under the conditions of 5mV/s, 10mV/s, 20mV/s. Under the speed of sweeping of 5mV/s, the potential window of -1.2~-0.2V, the made electrode of embodiment 1 and traditional using PTFE as binder Cyclic voltammetry curve comparison diagram such as Fig. 1 of the iron electrode (comparative example 1) of preparation.Fig. 1 is that adhesive-free made from embodiment 1 is iron-based The cyclic voltammetry curve comparison diagram of traditional PTFE binder iron electrode of electrode and comparative example 1.As seen from Figure 1, of the invention Iron-based electrode (the Ni-Fe of the binder free of preparation3O4@AB@PAN) area under the curve obtained in cyclic voltammetry compared to tradition It is much greater as the electrode (comparative example 1) of binder using PTFE, in addition, binder free iron prepared by the embodiment of the present invention 1 Anodizing peak and reduction peak are more symmetrical compared with comparative example 1, and more closely, illustrate that electrode prepared by the present invention has more High invertibity and cyclical stability.
(2) constant current charge-discharge test is carried out to electrode obtained, charge and discharge potential range is -1.1~-0.2V, and electric current is close Degree is respectively 0.5A/g, 1A/g, 2A/g.Under the current density of 0.5A/g, the made electrode of embodiment 1 and traditional with PTFE Constant current charge-discharge curve comparison figure for the iron electrode (comparative example 1) of binder preparation is as shown in Figure 2.Fig. 2 is made for embodiment 1 The iron-based electrode of adhesive-free and comparative example 1 traditional PTFE binder iron electrode constant current charge-discharge curve comparison figure.
It can significantly find out that the electrode discharge time prepared by the embodiment of the present invention 1 is longer as Fig. 2, specific capacity is bigger, calculates The capacity for obtaining embodiment 1 is 171.47mAh/g, and the capacity of comparative example 1 is only 60.01mAh/g.
(3) electrochemical impedance test is carried out to electrode, the frequency range of exchange potential wave is 0.1-100000Hz.Embodiment The electrochemical impedance spectroscopy comparison diagram of 1 made electrode and traditional iron electrode (comparative example 1) prepared using PTFE as binder is such as Shown in Fig. 3.Fig. 3 is the electricity of traditional PTFE binder iron electrode of the iron-based electrode of adhesive-free made from embodiment 1 and comparative example 1 Chemical impedance spectral curve.
It can significantly find out that traditional using PTFE is electrode material made from the preparation method of binder in high frequency region as Fig. 3 Curve semicircle radius it is larger, illustrate that material impedance itself is big, and high frequency region occur impedance semicircle rotation the phenomenon that, and The appearance of this phenomenon is usually because the inhomogeneities of electrode/electrolyte interfacial property is related, and prepared by the embodiment of the present invention 1 Electrode it is small in high frequency region curve semicircle radius, it can be seen that the method that the present invention prepares electrode effectively reduces the resistance of material It is anti-, and prepare that resulting Cathode uniformity is higher, and diffusion resistance is smaller.
It can illustrate that Fe/FeO has been effectively relieved in electrode of the invention by the impedance spectra (Fig. 3) in the embodiment of the present invention 1x Dissolution and reprecipitation outside active material particle surface, because of traditional iron electrode (comparative example for thering is PTFE binder to prepare 1) after cyclic voltammetry and constant current charge-discharge test, impedance spectra high frequency region this it appears that material " disperse There is the phenomenon that impedance semicircle rotation in effect ", and the appearance of this phenomenon is usually because electrode/electrolyte interfacial property Inhomogeneities it is related.And electrode of the invention is there is no apparent impedance semicircle rotation phenomenon, and semicircle radius be much smaller than with PTFE is the iron electrode of binder preparation, illustrates that the impedance of material is smaller, chemical property is more excellent.
And by the constant current charge-discharge curve (Fig. 2) in the embodiment of the present invention 1 it can be seen that electrode discharge platform of the invention It is more negative, that is, constitute the discharge voltage that iron cell favorably increases battery.And discharge time is longer, specific capacity is higher, therefore the present invention Electrode can be effectively relieved caused by forming the ferrous hydroxide of insulation in charging process and reduce cell voltage, slow down electric discharge speed The problem of rate.
S2: iron electrode prepared by embodiment 2~9 and comparative example 1~4 is subjected to constant current charge-discharge test: test method With condition with embodiment 1.Test result is as shown in Fig. 4~8.
Fig. 4 is the constant current charge-discharge curve of iron electrode prepared by embodiment 2,3 and comparative example 2；Fig. 5 is embodiment 2,4,5 The constant current charge-discharge curve of the iron electrode prepared with comparative example 1；Fig. 6 is iron electrode prepared by embodiment 3,6,7 and comparative example 2 Constant current charge-discharge curve；Fig. 7 is the constant current charge-discharge curve of iron electrode prepared by embodiment 8 and comparative example 3；Fig. 8 is embodiment 9 The constant current charge-discharge curve of the iron electrode prepared with comparative example 4.
As seen from Figure 4, specific capacity is significantly higher than same preparation process to the electrode (embodiment 2,3) of preparation after pyrolysis The lower but electrode (comparative example 2) without pyrolysis, and it is pyrolyzed 2h (embodiment 2) and to be pyrolyzed 1h (embodiment 3) difference unobvious, through counting Calculate the capacity of 2 gained iron electrode of embodiment is 158.78mAh/g, the capacity of 3 gained iron electrode of embodiment is 156.38mAh/ G, the capacity of 2 the electrode obtained of comparative example are 70.81mAh/g.
As seen from Figure 5, under same pyrolysis temperature (550 DEG C) and pyrolysis time (2h), 2 (Fe of embodiment3O4: The mass ratio of AB:PAN is 5:3:2) the electrode obtained discharges, and duration is longer, and performance is more excellent, and 4 (Fe of embodiment3O4: the matter of AB:PAN Amount ratio is 5:2:3), 5 (Fe of embodiment3O4: the mass ratio of AB:PAN is closer to for the electric discharge duration of 6:2:2), chemical property It is close.It is computed, the capacity of 2 gained iron electrode of embodiment is 158.78mAh/g, and the capacity of 4 gained iron electrode of embodiment is The capacity of 138.03mAh/g, 5 gained iron electrode of embodiment are 137.17mAh/g, and the capacity of 1 gained iron electrode of comparative example is 60.01mAh/g.Illustrate having a certain impact with comparison electrode electro Chemical performance for polyacrylonitrile, but in present invention protection proportion In range, the iron electrode performance of the pyrolysis preparation of all provable polyacrylonitrile is than traditional electrode prepared using PTFE as binder (comparative example 1) performance is more excellent.
It as seen from Figure 6, is Fe in equally pyrolysis 2h and with 5:3:23O4: under conditions of AB:PAN mass ratio, in this hair Electricity prepared by embodiment 3 (550 DEG C), embodiment 6 (400 DEG C) and embodiment 7 (700 DEG C) in bright protection pyrolysis temperature range Comparative example 2 of the discharge time of pole obviously than not being pyrolyzed is long.It is computed, the capacity of 3 gained iron electrode of embodiment is The capacity of 156.38mAh/g, 6 gained iron electrode of embodiment are 110.08mAh/g, and the capacity of 7 gained iron electrode of embodiment is 92.59mAh/g, the capacity of 2 the electrode obtained of comparative example are 70.81mAh/g.Illustrate in pyrolysis temperature protection scope 230~1000 There are optimal pyrolysis temperature within the scope of DEG C, and have the effect that pyrolysis obtains electrode between high temperature, short time can for low temperature pyrolysis for a long time It can be close.
It can be obtained by Fig. 7, the effect that the carbon structure formed after PAN pyrolysis can ban PTFE is applicable not only to 20nm Fe3O4, It is equally applicable to the ferroso-ferric oxide of other partial sizes.It is computed, iron electrode capacity obtained by embodiment 8 is 119.69mAh/ G, iron electrode capacity obtained by comparative example 3 is only 26.75mAh/g.
It can be obtained by Fig. 8, the effect that the carbon structure formed after PAN pyrolysis can ban PTFE is applicable not only to Fe3O4, to three It is equally applicable to aoxidize two iron.It is computed, iron electrode capacity obtained by embodiment 9 is 101.17mAh/g, and comparative example 3 is made The iron electrode capacity obtained is only 29.43mAh/g.
S3: the specific capacity test data of the iron electrode of Examples 1 to 9 preparation is as shown in table 1, iron prepared by comparative example 1~4 The specific capacity test data of electrode is as shown in table 2.
The iron electrode specific capacity of 1 Examples 1 to 9 of table preparation
The iron electrode specific capacity of 2 comparative example 1~4 of table preparation

Claims (9)

1. a kind of preparation method of the iron-based electrode of adhesive-free, it is characterised in that: the following steps are included:
1) polyacrylonitrile wiring solution-forming is obtained by polyacrylonitrile solution using organic solvent；
2) ferriferous oxide is uniformly mixed with conductive materials, obtains powder activity substance；The ferriferous oxide is four oxidations three More than one in iron or ferric oxide；The conductive materials are acetylene black, active carbon or graphene；
3) polyacrylonitrile solution and powder activity substance are mixed, demulsification obtains coating material；
4) coating material is dried coated on carrier, then compacting is pyrolyzed in an inert atmosphere, obtain the iron-based electricity of adhesive-free Pole.
2. the preparation method of the iron-based electrode of adhesive-free according to claim 1, it is characterised in that: polyacrylonitrile in step 3) The mass ratio of polyacrylonitrile and powder activity substance is (2~5) in solution: (8~5), i.e., polyacrylonitrile accounts for polyacrylonitrile and work The total amount 20%~50% of property substance.
3. the preparation method of the iron-based electrode of adhesive-free according to claim 1, it is characterised in that: be pyrolyzed described in step 4) Temperature be 230~1000 DEG C；The pyrolysis time is 0.5~5h.
4. the preparation method of the iron-based electrode of adhesive-free according to claim 1, it is characterised in that: iron oxygen described in step 2) The mass ratio of compound and conductive materials is (1~3.5): 1；
The mass concentration of polyacrylonitrile is 2%~10% in polyacrylonitrile solution in step 1).
5. the preparation method of the iron-based electrode of adhesive-free according to claim 1, it is characterised in that: organic described in step 1) Solvent is more than one in N,N-dimethylformamide or dimethyl sulfoxide；The demulsifying agent of demulsification described in step 3) is anhydrous second Alcohol or ether.
6. the preparation method of the iron-based electrode of adhesive-free according to claim 1, it is characterised in that: carrier described in step 4) For nickel screen, titanium net, stainless (steel) wire, titanium foil or copper foil；
The temperature of the step 4) drying is 40~80 DEG C；The pressure of the compacting is 20~50MPa.
7. a kind of iron-based electrode of adhesive-free obtained by any one of claim 1~6 preparation method.
8. the application of the iron-based electrode of adhesive-free according to claim 7, it is characterised in that: the iron-based electrode of adhesive-free For rechargeable battery and/or supercapacitor.
9. application according to claim 8, it is characterised in that: the iron-based electrode of adhesive-free is for the empty secondary electricity of iron Pond.
CN201910344166.8A 2019-04-26 2019-04-26 A kind of iron-based electrode of adhesive-free and the preparation method and application thereof Pending CN110137451A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910344166.8A CN110137451A (en) 2019-04-26 2019-04-26 A kind of iron-based electrode of adhesive-free and the preparation method and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910344166.8A CN110137451A (en) 2019-04-26 2019-04-26 A kind of iron-based electrode of adhesive-free and the preparation method and application thereof

Publications (1)

Publication Number Publication Date
CN110137451A true CN110137451A (en) 2019-08-16

Family

ID=67575327

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910344166.8A Pending CN110137451A (en) 2019-04-26 2019-04-26 A kind of iron-based electrode of adhesive-free and the preparation method and application thereof

Country Status (1)

Country Link
CN (1) CN110137451A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112349881A (en) * 2020-11-17 2021-02-09 河南电池研究院有限公司 Manufacturing method of flexible current collector-free electrode
CN113675407A (en) * 2021-08-23 2021-11-19 中国科学院上海应用物理研究所 Preparation method of all-solid-state iron-air battery and all-solid-state iron-air battery obtained by same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102160217A (en) * 2008-10-17 2011-08-17 独立行政法人产业技术综合研究所 Sulfur-modified polyacrylonitrile, manufacturing method therefor, and application thereof
CN103545118A (en) * 2013-10-24 2014-01-29 四川大学 Polyvinylidene-fluoride-based electrode materials based on addition of conductive materials and preparation method thereof
US20140225041A1 (en) * 2011-06-30 2014-08-14 Cornell University Hybrid Materials and Nanocomposite Materials, Methods of Making Same, and Uses Thereof
WO2018071846A1 (en) * 2016-10-13 2018-04-19 Sillion, Inc. Large-format battery anodes comprising silicon particles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102160217A (en) * 2008-10-17 2011-08-17 独立行政法人产业技术综合研究所 Sulfur-modified polyacrylonitrile, manufacturing method therefor, and application thereof
US20140225041A1 (en) * 2011-06-30 2014-08-14 Cornell University Hybrid Materials and Nanocomposite Materials, Methods of Making Same, and Uses Thereof
CN103545118A (en) * 2013-10-24 2014-01-29 四川大学 Polyvinylidene-fluoride-based electrode materials based on addition of conductive materials and preparation method thereof
WO2018071846A1 (en) * 2016-10-13 2018-04-19 Sillion, Inc. Large-format battery anodes comprising silicon particles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112349881A (en) * 2020-11-17 2021-02-09 河南电池研究院有限公司 Manufacturing method of flexible current collector-free electrode
CN113675407A (en) * 2021-08-23 2021-11-19 中国科学院上海应用物理研究所 Preparation method of all-solid-state iron-air battery and all-solid-state iron-air battery obtained by same
CN113675407B (en) * 2021-08-23 2022-08-09 中国科学院上海应用物理研究所 Preparation method of all-solid-state iron-air battery and all-solid-state iron-air battery obtained by same

Similar Documents

Publication Publication Date Title
Tang et al. Mg0. 6Ni0. 4O hollow nanofibers prepared by electrospinning as additive for improving electrochemical performance of lithium–sulfur batteries
CN107946576B (en) High-rate graphite negative electrode material, preparation method thereof and lithium ion battery
Li et al. Pencil-drawing on nitrogen and sulfur co-doped carbon paper: An effective and stable host to pre-store Li for high-performance lithium–air batteries
CN108598390A (en) A kind of preparation method and lithium-sulfur cell of positive material for lithium-sulfur battery
CN107403919A (en) A kind of nitrating carbon material cladding aoxidizes composite of sub- silicon and preparation method thereof
CN105355877A (en) Graphene-metal oxide composite negative electrode material and preparation method therefor
CN108390035A (en) The preparation method of graphene/trielement composite material
CN106935916A (en) A kind of preparation method of high-performance zinc Polyaniline Secondary Battery
EP3319152A1 (en) Doped conductive oxide and improved electrochemical energy storage device polar plate based on same
CN110993944B (en) Water-based ion battery and application thereof
CN103078092A (en) Method for preparing Si/C composite cathode material of lithium ion battery
CN111146416A (en) Nitrogen-doped silicon-based material, preparation method thereof and application thereof in battery
CN102110813B (en) Graphite material at negative pole of lithium ion battery and preparation method thereof
Wang et al. Multifunctional porous VN nanowires interlayer as polysulfides barrier for high performance lithium sulfur batteries
CN103094551B (en) A kind of graphite/manganous oxide combination electrode material and preparation method thereof
CN102274965B (en) Method for improving electrochemical performance of hydrogen storage alloy powder by utilizing electropolymerization polyaniline
CN107681130A (en) A kind of preparation method of the lithium sulfur battery anode material of solid electrolyte
Xu et al. Slurry-like hybrid electrolyte with high lithium-ion transference number for dendrite-free lithium metal anode
CN101944588A (en) Capacitor carbon/lithium iron phosphate composite material, preparation method thereof and lithium-ion capacitor battery using same as cathode material
CN104659333A (en) Preparation method of Mg2Si/SiOx/C composite cathode material membrane electrode of lithium ion secondary battery
Li et al. A dendrite-free Li plating host towards high utilization of Li metal anode in Li–O2 battery
CN108321432A (en) It is a kind of to be used to inhibit carbon nitrogen polymer reference solid state electrolyte of lithium dendrite growth and its preparation method and application
CN109088065A (en) A kind of preparation method of the negative electrode material of lithium-air battery
Fu et al. Lithiophilic Sb surface modified Cu nanowires grown on Cu foam: a synergistic 1D@ 3D hierarchical structure for stable lithium metal anodes
CN109638289A (en) A kind of preparation method and application of new type lithium ion battery conductive additive carbonization silk

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20190816