CN113991062A - High-capacity energy storage lithium ion battery and preparation method thereof - Google Patents
High-capacity energy storage lithium ion battery and preparation method thereof Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 37
- 238000004146 energy storage Methods 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- JZUAITAPPPWUSR-UHFFFAOYSA-N bis(selanylidene)iron Chemical compound [Fe](=[Se])=[Se] JZUAITAPPPWUSR-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 40
- 239000004014 plasticizer Substances 0.000 claims abstract description 28
- 239000007773 negative electrode material Substances 0.000 claims abstract description 18
- 239000011267 electrode slurry Substances 0.000 claims abstract description 15
- 238000004140 cleaning Methods 0.000 claims description 37
- 238000000605 extraction Methods 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 22
- 229910052744 lithium Inorganic materials 0.000 claims description 22
- 239000002135 nanosheet Substances 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 20
- 229920000642 polymer Polymers 0.000 claims description 16
- 238000005406 washing Methods 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 239000006258 conductive agent Substances 0.000 claims description 11
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- -1 polytetrafluoroethylene Polymers 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
- 238000007731 hot pressing Methods 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 7
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 5
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims description 5
- 239000006230 acetylene black Substances 0.000 claims description 5
- 239000004917 carbon fiber Substances 0.000 claims description 5
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 5
- 239000002041 carbon nanotube Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 5
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 229920005569 poly(vinylidene fluoride-co-hexafluoropropylene) Polymers 0.000 claims description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 1
- 239000002055 nanoplate Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 12
- 238000001179 sorption measurement Methods 0.000 abstract description 9
- 239000003792 electrolyte Substances 0.000 abstract description 8
- 239000002086 nanomaterial Substances 0.000 abstract description 8
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 28
- 239000010406 cathode material Substances 0.000 description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- General Chemical & Material Sciences (AREA)
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- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
A high-capacity energy storage lithium ion battery and a preparation method thereof are disclosed, wherein an iron diselenide nano material is used as a negative electrode material, and a plasticizer is added into negative electrode slurry to form a micro porous structure. The process can be conveniently embedded into the existing lithium ion battery preparation process, and can ensure the sufficient and rapid adsorption of the electrolyte on the premise of not prolonging the injection adsorption time, thereby ensuring the capacity and the cycle characteristic of the finished lithium ion battery.
Description
Technical Field
The application relates to the technical field of lithium batteries, in particular to a high-capacity energy storage lithium ion battery and a preparation method thereof.
Background
With the development of new energy technology, especially in the field of new energy automobiles, a lithium battery is one of the battery types commonly used for new energy automobiles. In order to enable a lithium battery on a new energy automobile to have higher capacity and better cycle characteristics, the problems of improving the cycle characteristics of the lithium battery, improving the capacity of the lithium battery and the like are all main problems in the industry. At present, different battery manufacturers adopt different technologies to improve the capacity of the lithium battery and improve the cycle characteristics of the lithium battery. For example, methods of improving the anode material, improving the assembly process, etc.
At present, iron diselenide nanosheets are used as a novel lithium battery cathode material, have a good nanostructure, and lithium batteries manufactured by using the iron diselenide nanosheets as the cathode material can also have good cycle characteristics. However, how to combine the iron diselenide nanosheet preparation process into a commonly used lithium battery preparation process to minimize modification costs of the process route is a matter of consideration for manufacturers.
Disclosure of Invention
The embodiment of the application provides an energy storage lithium ion battery based on a nano electrode and a preparation method thereof, iron diselenide nanosheets are used as negative electrode materials, the liquid absorption efficiency in the battery preparation process can be improved, and the time required by the preparation process is reduced.
The embodiment of the application provides a preparation method of an energy storage lithium ion battery based on a nano electrode, which comprises the following steps:
preparing a positive plate and a diaphragm;
preparing a negative plate, comprising:
grinding the iron diselenide nanosheets to obtain iron diselenide powder with uniform particles;
adding a solvent into a container, heating the solvent to 40-50 ℃, adding a negative electrode polymer, stirring for 3-4 hours, adding a plasticizer after the negative electrode polymer is fully dissolved, stirring for 1-2 hours, adding a conductive agent, stirring for 3-4 hours, adding a negative electrode active material, and stirring for 5-6 hours to prepare a negative electrode slurry; the negative active material includes at least the iron diselenide powder;
coating the negative electrode slurry on a negative electrode substrate material, and drying to obtain a negative electrode sheet;
an extraction step, namely placing the negative plate in an extraction solution to extract the plasticizer in the negative plate;
and laminating the negative plate, the diaphragm and the positive plate, and then bonding the negative plate, the diaphragm and the positive plate together by hot pressing to obtain the battery core.
And cutting, shelling, injecting and forming the prepared battery core to obtain a finished lithium battery.
In one embodiment, when preparing the positive electrode sheet, a positive electrode slurry may be prepared, and the positive electrode slurry may include a positive electrode active material, a conductive agent, a positive electrode polymer, and the like, and then the positive electrode slurry is applied
In one embodiment, the extracting step specifically includes: and (3) placing the negative plate into an extraction solution, heating to 40-45 ℃, and maintaining for 3-4 hours to extract the plasticizer in the negative plate.
In an embodiment, the method further includes a step of vibration cleaning, in which the extracted negative electrode plate is placed in a vibration cleaning machine, and vibration cleaning is performed under a cleaning solution, so as to clean the nanopore-shaped structure of the negative electrode material in the negative electrode plate.
In one embodiment, the duration of the shaking cleaning is 0.5-1 hour.
In one embodiment, the cleaning solution is deionized water.
In an embodiment, the method further comprises drying the washed negative electrode sheet.
In one embodiment, the preparation process of the iron diselenide nanosheets comprises:
adding selenium powder and an iron source into a polytetrafluoroethylene reaction window, then adding a reducing agent, and after full reaction, cleaning and drying by using a cleaning solution to obtain the iron diselenide nanosheet.
In one embodiment, the iron source comprises FeSO4·7H2And O, the reducing agent comprises ethanolamine, and the cleaning solution comprises deionized water and/or ethanol.
In one embodiment, the negative electrode polymer comprises polyvinylidene fluoride-hexafluoropropylene; the plasticizer comprises a phthalate compound; the conductive agent comprises at least one of acetylene black, graphite powder, carbon nanotubes and carbon fibers.
The embodiment of the application also provides an energy storage lithium ion battery based on the nano electrode, and the energy storage lithium ion battery based on the nano electrode is prepared by any one of the preparation methods of the energy storage lithium ion battery based on the nano electrode.
The embodiment of the application also provides a preparation method of the high-capacity energy storage lithium ion battery, which comprises the following steps:
preparing a positive plate and a diaphragm;
preparing a negative plate, comprising:
grinding the iron diselenide nanosheets to obtain iron diselenide powder with uniform particles;
adding a solvent into a container, heating the solvent to 40-50 ℃, adding a negative electrode polymer, stirring for 3-4 hours, adding a plasticizer after the negative electrode polymer is fully dissolved, stirring for 1-2 hours, adding a conductive agent, stirring for 3-4 hours, adding a negative electrode active material, and stirring for 5-6 hours to prepare a negative electrode slurry; the negative active material includes at least the iron diselenide powder;
coating the negative electrode slurry on a negative electrode substrate material, and drying to obtain a negative electrode sheet;
and laminating the negative plate, the diaphragm and the positive plate, and then bonding the negative plate, the diaphragm and the positive plate together by hot pressing to obtain the battery core.
An extraction step, namely placing the electric core in an extraction solution to extract the plasticizer in the electric core;
and cutting, shelling, injecting and forming the prepared battery core to obtain a finished lithium battery.
In one embodiment, the extracting step specifically includes: and (3) placing the electric core into an extraction solution, heating to 40-45 ℃, and maintaining for 3-4 hours to extract the plasticizer in the electric core.
In an embodiment, the method further includes a water flow washing step, in which the extracted battery cell is placed in a water flow washing machine, and water flow washing is performed under a washing liquid, so as to clean the nanopore-shaped structure of the negative electrode material in the battery cell.
In one embodiment, the time for flushing with water is 0.5-1 hour.
In one embodiment, the cleaning solution is deionized water.
In an embodiment, the method further includes drying the cleaned battery cell.
In one embodiment, the preparation process of the iron diselenide nanosheets comprises:
adding selenium powder and an iron source into a polytetrafluoroethylene reaction window, then adding a reducing agent, and after full reaction, cleaning and drying by using a cleaning solution to obtain the iron diselenide nanosheet.
In one embodiment, the iron source comprises FeSO4·7H2And O, the reducing agent comprises ethanolamine, and the cleaning solution comprises deionized water and/or ethanol.
In one embodiment, the negative electrode polymer comprises polyvinylidene fluoride-hexafluoropropylene; the plasticizer comprises a phthalate compound; the conductive agent comprises at least one of acetylene black, graphite powder, carbon nanotubes and carbon fibers.
The embodiment of the application also provides a high-capacity energy storage lithium ion battery, which is prepared by the preparation method of any one of the high-capacity energy storage lithium ion batteries.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for preparing a nano-electrode based energy storage lithium ion battery according to an embodiment;
FIG. 2 is a schematic flow chart of a method for preparing a nanoelectrode-based energy storage lithium ion battery according to another embodiment;
FIG. 3 is a schematic flow chart of a method for manufacturing a high capacity energy storage lithium ion battery according to an embodiment;
fig. 4 is a schematic flow chart of a method for manufacturing a high-capacity energy storage lithium ion battery in another embodiment.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
At present, the iron diselenide nanosheet is used as a lithium battery cathode material, the iron diselenide nanosheet has a better structure, irregular nanoparticles are distributed in the iron diselenide nanosheet, and the prepared lithium battery has a better cycle characteristic. However, in the lithium battery using the iron diselenide nanosheet as the negative electrode material, a long time is required for the adsorption of the electrolyte, so that the sufficient and uniform adsorption can be ensured, and the capacity and the cycle characteristic of the finished lithium battery can be ensured.
In order to solve the above technical problem, as shown in fig. 1, an embodiment of the present application provides a method for preparing an energy storage lithium ion battery based on a nano electrode, including the following steps:
step 101: and preparing a positive plate and a diaphragm.
Step 102: and preparing the negative plate. Step 102 specifically comprises the following substeps:
1.1: and grinding the iron diselenide nanosheets to obtain iron diselenide powder with uniform particles.
1.2: adding a solvent into a container, heating the solvent to 40-50 ℃, adding a negative electrode polymer, stirring for 3-4 hours, adding a plasticizer after the negative electrode polymer is fully dissolved, stirring for 1-2 hours, adding a conductive agent, stirring for 3-4 hours, adding a negative electrode active material, and stirring for 5-6 hours to prepare a negative electrode slurry; the negative active material includes at least the iron diselenide powder.
1.3: and coating the negative electrode slurry on a negative electrode substrate material, and drying to obtain the negative electrode sheet. In one embodiment, the negative electrode substrate material may be a copper foil.
Step 103: and an extraction step, namely placing the negative plate in an extraction solution to extract the plasticizer in the negative plate.
Step 104: and laminating the negative plate, the diaphragm and the positive plate, and then bonding the negative plate, the diaphragm and the positive plate together by hot pressing to obtain the battery core.
Step 105: and cutting, shelling, injecting and forming the prepared battery core to obtain a finished lithium battery.
In the embodiment, the iron diselenide nano material is used as the negative electrode, and the plasticizer is added in the process, so that on one hand, the flexibility of the negative electrode plate can be increased, the negative electrode plate, the diaphragm and the positive electrode plate can be conveniently subjected to hot pressing in the step 104, and the overall strength of the finished lithium battery can also be improved; on the other hand, after the plasticizer is extracted in the subsequent extraction step, a fine porous structure can be formed, so that the electrolyte can be adsorbed more sufficiently and rapidly after liquid injection.
In one embodiment, the extracting step specifically includes: and (3) placing the negative plate into an extraction solution, heating to 40-45 ℃, and maintaining for 3-4 hours to extract the plasticizer in the negative plate. This example further increases the extraction rate and the completeness of extraction by maintaining a certain extraction temperature.
In an embodiment, as shown in fig. 2, the method for preparing a nano-electrode based energy storage lithium ion battery further includes step 201: a vibration cleaning step: and placing the extracted negative plate in a vibration cleaning machine, and performing vibration cleaning under cleaning solution to clean the nano-pore structure of the negative material in the negative plate. Vibrate the cleaning machine and can vibrate the washing with placing the negative pole piece in equipment, wash extraction solution on the one hand, on the other hand can wash mediation negative electrode material's microporous structure more completely through the mode of vibrating, guarantees better to annotate the adsorption effect to electrolyte after the liquid.
In one embodiment, the oscillating cleaning step may use deionized water as the cleaning solution.
In one embodiment, the duration of the shaking cleaning is 0.5-1 hour. It should be noted that the frequency of the oscillation cleaning machine cannot be set too high, the oscillation strength cannot be too strong, and the cleaning time cannot be too long, otherwise the prepared negative plate and the internal structure of the material thereof are easily damaged to a certain extent, thereby achieving the opposite effect.
In an embodiment, the washed negative electrode sheet needs to be dried.
In one embodiment, the preparation process of the iron diselenide nanosheets comprises: adding selenium powder and an iron source into a polytetrafluoroethylene reaction window, then adding a reducing agent, and after full reaction, cleaning and drying by using a cleaning solution to obtain the iron diselenide nanosheet.
In one embodiment, the iron source comprises FeSO4·7H2And O, the reducing agent comprises ethanolamine, and the cleaning solution comprises deionized water.
In one embodiment, the negative electrode polymer comprises polyvinylidene fluoride-hexafluoropropylene; the plasticizer comprises a phthalate compound; the conductive agent comprises at least one of acetylene black, graphite powder, carbon nanotubes and carbon fibers.
Correspondingly, the embodiment of the application also provides an energy storage lithium ion battery based on the nano electrode, and the energy storage lithium ion battery based on the nano electrode is prepared by the preparation method of the energy storage lithium ion battery based on the nano electrode in any embodiment.
According to the energy storage lithium ion battery based on the nano electrode and the preparation method thereof, the iron diselenide nano material is used as the cathode material, so that the iron diselenide nano material can be conveniently embedded into the existing lithium ion battery preparation process, and the electrolyte can be fully and quickly adsorbed on the premise of not prolonging the length of liquid injection adsorption time, so that the capacity and the cycle characteristic of the finished product lithium ion battery are ensured.
The above examples provide processes for separate extraction and cleaning of the negative plate, which are typically used without the addition of a plasticizer to the positive plate/separator material. In some processes, in order to increase the microporous structures of the positive plate and the diaphragm material, a plasticizer is also added into the positive plate slurry and the diaphragm slurry, so that in order to save process nodes, the positive plate, the diaphragm and the negative plate do not need to be extracted and cleaned separately, and the positive plate, the diaphragm and the negative plate are subjected to hot pressing to prepare a battery core and then are extracted and cleaned together.
As shown in fig. 3, an embodiment of the present application further provides a method for preparing a high-capacity energy storage lithium ion battery, including the following steps:
step 301: and preparing a positive plate and a diaphragm.
Step 302: and preparing the negative plate. Step 302 specifically includes the following substeps:
3.1: and grinding the iron diselenide nanosheets to obtain iron diselenide powder with uniform particles.
3.2: adding a solvent into a container, heating the solvent to 40-50 ℃, adding a negative electrode polymer, stirring for 3-4 hours, adding a plasticizer after the negative electrode polymer is fully dissolved, stirring for 1-2 hours, adding a conductive agent, stirring for 3-4 hours, adding a negative electrode active material, and stirring for 5-6 hours to prepare a negative electrode slurry; the negative active material includes at least the iron diselenide powder.
3.3: and coating the negative electrode slurry on a negative electrode substrate material, and drying to obtain the negative electrode sheet. In one embodiment, the negative electrode substrate material may be a copper foil.
Step 303: and laminating the negative plate, the diaphragm and the positive plate, and then bonding the negative plate, the diaphragm and the positive plate together by hot pressing to obtain the battery core.
Step 304: and an extraction step, namely placing the electric core in an extraction solution to extract the plasticizer in the electric core. In this embodiment, a plasticizer is usually added to both the positive electrode slurry and the separator slurry.
Step 305: and cutting, shelling, injecting and forming the prepared battery core to obtain a finished lithium battery.
In the embodiment, the iron diselenide nano material is used as the negative electrode, and the plasticizer is added in the process, so that on one hand, the flexibility of the negative electrode plate can be increased, the negative electrode plate, the diaphragm and the positive electrode plate can be conveniently subjected to hot pressing in the step 104, and the overall strength of the finished lithium battery can also be improved; on the other hand, after the plasticizer is extracted in the subsequent extraction step, a fine porous structure can be formed, so that the electrolyte can be adsorbed more sufficiently and rapidly after liquid injection.
In one embodiment, the extracting step specifically includes: and (3) placing the electric core into an extraction solution, heating to 40-45 ℃, and maintaining for 3-4 hours to extract the plasticizer in the electric core. This example further increases the extraction rate and the completeness of extraction by maintaining a certain extraction temperature.
In an embodiment, as shown in fig. 4, the method for preparing a high-capacity energy storage lithium ion battery further includes step 401: and a water flow washing step, namely placing the extracted battery cell in a water flow washing machine, and washing the battery cell with water flow under a washing liquid to clean the nano-pore structure of the negative electrode material in the battery cell. The rivers flushing machine can carry out the rivers with placing the electric core in the equipment and wash, washs extraction solution on the one hand, and on the other hand can wash the microporous structure of mediation cathode material, diaphragm material more completely through the mode of washing, guarantees better to annotate the adsorption effect to electrolyte after the liquid.
It should be noted that, in this embodiment, since the battery core is cleaned, the oscillation cleaning method in the above embodiment cannot be adopted, because the oscillation cleaning method is easier to damage the battery core adhered to the battery core, and therefore, the battery core can only be washed by water flow with appropriate intensity.
In one embodiment, the cleaning solution is deionized water.
In one embodiment, the time for flushing with water is 0.5-1 hour. Similarly, the strength and the speed of the water flow for washing the battery cell by the water flow cannot be set too high, the washing time cannot be too long, otherwise, the prepared battery cell and the internal structure of the battery cell are easily damaged to a certain extent, and therefore the reverse effect is achieved.
In an embodiment, the cleaned battery cell needs to be dried.
In one embodiment, the preparation process of the iron diselenide nanosheets comprises: adding selenium powder and an iron source into a polytetrafluoroethylene reaction window, then adding a reducing agent, and after full reaction, cleaning and drying by using a cleaning solution to obtain the iron diselenide nanosheet.
In one embodiment, the iron source comprises FeSO4·7H2And O, the reducing agent comprises ethanolamine, and the cleaning solution comprises deionized water.
In one embodiment, the negative electrode polymer comprises polyvinylidene fluoride-hexafluoropropylene; the plasticizer comprises a phthalate compound; the conductive agent comprises at least one of acetylene black, graphite powder, carbon nanotubes and carbon fibers.
Correspondingly, the embodiment of the application also provides a high-capacity energy storage lithium ion battery, and the high-capacity energy storage lithium ion battery is prepared by any one of the preparation methods of the high-capacity energy storage lithium ion battery.
According to the high-capacity energy storage lithium ion battery and the preparation method thereof, the iron diselenide nano material is used as the cathode material, the iron diselenide nano material can be conveniently embedded into the existing lithium ion battery preparation process, and sufficient and rapid adsorption of electrolyte can be ensured on the premise of not prolonging the length of liquid injection adsorption time, so that the capacity and the cycle characteristic of the finished product lithium ion battery are ensured.
It should be noted that, the specifications such as steps, material proportions, and the like related to the lithium battery preparation process in the embodiment of the present application may refer to a general process, and the present application only provides detailed descriptions for related points of the invention, and further details are not repeated for other secondary contents.
Reference is made herein to various exemplary embodiments. However, those skilled in the art will recognize that changes and modifications may be made to the exemplary embodiments without departing from the scope hereof. For example, the various operational steps, as well as the components used to perform the operational steps, may be implemented in differing ways depending upon the particular application or consideration of any number of cost functions associated with operation of the system (e.g., one or more steps may be deleted, modified or incorporated into other steps).
The terms "first," "second," and the like in the description and claims herein and in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, or apparatus.
The foregoing detailed description has been described with reference to various embodiments. However, one skilled in the art will recognize that various modifications and changes may be made without departing from the scope of the present disclosure. Accordingly, the disclosure is to be considered in an illustrative and not a restrictive sense, and all such modifications are intended to be included within the scope thereof. Also, advantages, other advantages, and solutions to problems have been described above with regard to various embodiments. However, the benefits, advantages, solutions to problems, and any element(s) that may cause any element(s) to occur or become more pronounced are not to be construed as a critical, required, or essential feature or element of any or all the claims. As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, system, article, or apparatus.
The above examples only show some embodiments, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A preparation method of a high-capacity energy storage lithium ion battery is characterized by comprising the following steps:
preparing a positive plate and a diaphragm;
preparing a negative plate, comprising:
grinding the iron diselenide nanosheets to obtain iron diselenide powder with uniform particles;
adding a solvent into a container, heating the solvent to 40-50 ℃, adding a negative electrode polymer, stirring for 3-4 hours, adding a plasticizer after the negative electrode polymer is fully dissolved, stirring for 1-2 hours, adding a conductive agent, stirring for 3-4 hours, adding a negative electrode active material, and stirring for 5-6 hours to prepare a negative electrode slurry; the negative active material includes at least the iron diselenide powder;
coating the negative electrode slurry on a negative electrode substrate material, and drying to obtain a negative electrode sheet;
and laminating the negative plate, the diaphragm and the positive plate, and then bonding the negative plate, the diaphragm and the positive plate together by hot pressing to obtain the battery core.
An extraction step, namely placing the electric core in an extraction solution to extract the plasticizer in the electric core;
and cutting, shelling, injecting and forming the prepared battery core to obtain a finished lithium battery.
2. The method according to claim 1, wherein the extraction step comprises in particular: and (3) placing the electric core into an extraction solution, heating to 40-45 ℃, and maintaining for 3-4 hours to extract the plasticizer in the electric core.
3. The method of claim 1 or 2, further comprising a water washing step, wherein the extracted cell is placed in a water washing machine, and water washing is performed under a washing liquid to clean the nanopore-like structure of the negative electrode material in the cell.
4. The method of claim 3, wherein the water stream rinsing is maintained for a period of 0.5 to 1 hour.
5. The method of claim 3 or 4, wherein the cleaning fluid is deionized water.
6. The method of any one of claims 3-5, further comprising drying the washed cells.
7. The method of any one of claims 1-6, wherein the process for preparing iron diselenide nanoplates comprises:
adding selenium powder and an iron source into a polytetrafluoroethylene reaction window, then adding a reducing agent, and after full reaction, cleaning and drying by using a cleaning solution to obtain the iron diselenide nanosheet.
8. The method of claim 7, wherein the iron source comprises FeSO4·7H2And O, the reducing agent comprises ethanolamine, and the cleaning solution comprises deionized water.
9. The method of any one of claims 1-8, wherein the negative electrode polymer comprises polyvinylidene fluoride-hexafluoropropylene; the plasticizer comprises a phthalate compound; the conductive agent comprises at least one of acetylene black, graphite powder, carbon nanotubes and carbon fibers.
10. A high capacity energy storage lithium ion battery, characterized in that the high capacity energy storage lithium ion battery is prepared by the method of any one of claims 1-9.
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