CN111244396A - Application of reduced graphene oxide in high-capacity lithium ion battery - Google Patents
Application of reduced graphene oxide in high-capacity lithium ion battery Download PDFInfo
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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
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- 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
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0438—Processes of manufacture in general by electrochemical processing
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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
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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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
- 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
Abstract
Systems and methods of manufacturing electrodes are provided. An example method may include: disposing a slurry onto a surface of a current collector by a blade, the slurry comprising an active material and a solvent; applying an electric field between the blade and the current collector by means of an electric field source; the slurry disposed on the surface of the current collector is dried to remove the solvent. The electric field is continuously applied while the slurry is deposited onto the current blade surface. The electric field affects the structure of the slurry portion by causing van der waals interactions and polarization attraction between the active material and the current collector. The slurry may comprise 95% graphite, 3% binder and 5% reduced graphene oxide. The solvent may comprise a 4: 1 mixture of water and isopropanol.
Description
Technical Field
The application belongs to the field of batteries, and particularly relates to application of reduced graphene oxide in a high-capacity lithium ion battery.
Background
Lithium ion batteries have become very popular in products and systems that are suitable for use in rechargeable battery solutions. To manufacture lithium batteries, electrodes are constructed using a slurry coating applied to a current collector material. Currently, graphite anodes and binders, typically such as carboxymethylcellulose (CMC) and Styrene Butadiene Rubber (SBR), are used to deposit the active material onto the current collector. The capacity of the graphite anode was about 372 milliamp hours per gram (mAhg)-1). Thus, the use of graphite anodes reduces the capacity of lithium batteries. The binder does not participate in the lithiation or delithiation process. In addition, the binder increases the charge transfer resistance in the cell. Typically, the amount of binder in the cell is about 5%. Therefore, when all cells are assembled into a pack module, even if only 1%, it is an important factor for the total capacity. From a manufacturing and/or processing point of view, it is necessary to increase the amount of power supply of lithium batteries.
Disclosure of Invention
The present inventive technique, roughly described, uses an active material to reduce the amount of inactive binder material in the slurry mixture and applies an electric field to a blade (blade) to position the slurry mixture on the current electrode, thereby achieving greater contact between the slurry mixture and the current electrode surface. The active material may comprise reduced graphene oxide (redgraphene oxide). The mixture of reduced graphene oxide and slurry may improve the performance of the current electrode because reduced graphene oxide has more than 1000mAhg-1Higher than the energy density of graphite currently used in slurry mixtures. Thus, the use of reduced graphene oxide in a slurry coating of a current electrode of a battery may increase the overall capacity of the battery.
According to one embodiment of the present disclosure, a system for manufacturing an electrode is disclosed. The system may include a coater configured to protect the current collector. The system may include a blade configured to dispose the slurry on a surface of the current collector. The slurry may include an active material and an inactive material. The system can further include an electric field source configured to apply an electric field between the blade and the current collector.
The electric field may be applied continuously while the slurry is disposed on the surface of the current collector. Applying an electric field affects the structure of at least a portion of the slurry by causing an interaction between the graphene oxide active material and the current collector. Application of an electric field may result in polarization attraction and van der Waals interaction between the oxidized groups of the graphene oxide and the positively charged current collector to secure contact between the slurry and the current collector surface.
The blade is configured to dispose the slurry at a thickness of 65 microns. The electric field source may be configured to apply an electric field of at least 50 volts. The electric field source may be configured to provide a negative charge to the blade and a positive charge to the current collector.
The active material may comprise reduced graphene oxide. The slurry may comprise a 40% solution of solids (solid content) dissolved in a 4: 1 mixture of water and isopropanol. The solids may comprise 92% graphite, 3% binder and 5% reduced graphene oxide.
According to another embodiment of the present disclosure, a method of manufacturing an electrode is disclosed. The method may include disposing the slurry to a surface of the current collector by a blade. The slurry may include an active material and a solvent. The method may comprise applying an electric field between the blade and the current collector via an electric field source. The electric field may affect a portion of the structure of the slurry by causing interaction between the active material and the current collector. The method may comprise drying the slurry applied to the surface of the current collector to remove the solvent.
The active material comprises reduced graphene oxide. The slurry may comprise a 40% solution of solids dissolved in a 4: 1 mixture of water and isopropanol. The solids may comprise 92% graphite, 3% binder and 5% reduced graphene oxide. The method may comprise mixing the slurry with a planetary ball mixer (planetary ball mixer) for 30 minutes.
According to another embodiment of the present disclosure, an electrode of a rechargeable battery is disclosed. The electrode may include a current collector and a slurry coating disposed on a surface of the current collector. The slurry coating may comprise an active material. The slurry may have a structure that aligns in response to an electric field applied to the slurry and the current collector so that the slurry is disposed on the surface of the current collector. An electric field may be applied to cause van der waals interactions or polarized attraction between oxide components in the graphene oxide and the positively charged current collectors, thereby causing better adhesion between the active material and surface current collectors.
The active material may comprise reduced graphene oxide. The slurry may comprise a 40% solution of solids prior to being set. The solids may comprise 92% graphite, 3% binder and 5% reduced graphene oxide. The solids may be dissolved in 4: 1 in a mixture of water and isopropanol.
Drawings
Fig. 1A is a block diagram of a system for fabricating an electrode.
Fig. 1B is a block diagram of a system for fabricating an electrode.
Fig. 2 is a flow chart of the steps of a method of producing a lithium battery.
FIG. 3 is a flow chart of steps of a method of constructing an electrode.
Fig. 4 shows a table of slurry coating components.
Fig. 5 is a flow chart of the steps of a method of producing a slurry for coating an electrode.
Fig. 6 shows the direction of applying the slurry with active material particles to the current collector and the electric field.
Fig. 7A shows a slurry having active material particles and inactive material particles applied to a current collector.
Fig. 7B shows the application of the slurry with active material particles onto a current collector.
Detailed Description
The present technology relates to manufacturing electrodes for batteries. In particular, embodiments of the present disclosure include replacing or minimizing inactive binder materials in a slurry used to coat a current collector of an electrode in an electrochemical cell. The non-reactive binder material may be replaced with an active material to reduce the content of the non-reactive binder material in the slurry mixture.
For example, reduced graphene oxide may be embedded into the slurry to minimize the amount of inactive binder. A blade may be used to deposit the slurry with the active material onto the surface of the current collector. During the deposition of the slurry onto the surface of the current collector, an electric field may be applied to the blade and the current collector. The electric field may improve contact between the slurry and the current collector surface because the electric field causes van der waals interactions and polarization attraction between the active material and the current collector surface (e.g., copper surface). As a result, an electron path of the electrode is improved, an interfacial charge transfer resistance of the electrode is reduced, and diffusion of lithium ions in the electrode is increased.
Currently, the method of manufacturing electrodes for electrochemical cells uses slurry coating with graphite as the active material and CMC or SBR as the binder. Conventional coating methods utilize a binder to adhere the active material to the surface of the electrode current collector. The use of a binder in the slurry coating results in an increase in the charge transfer resistance of the battery, thereby reducing the overall capacity of the battery. By reducing the amount of inactive binder, and by increasing the active material, the overall capacity of the electrochemical cell can be increased. For example, the binder may be partially replaced by reduced graphene oxide. The capacity of graphite is lower than that of reduced graphene oxide. Thus, partial replacement of graphite with reduced graphene oxide may also increase the capacity of an electrochemical cell.
The use of graphene oxide as a negative active material can lead to higher capacity of lithium ion batteries. However, graphene oxide has insulation properties due to the large content of oxides on the carbon edge. This can obstruct the electron path and degrade the performance of the electrochemical cells in the cell. To mitigate these effects, in some embodiments of the present disclosure, graphene oxide is heat treated under argon flow at 350 degrees celsius for two hours to produce reduced graphene oxide. During the reduction process, lattice defects may form in the reduced graphene oxide structure. At higher levels, graphene oxide tends to agglomerate and disrupt lithium intercalation. Due to lattice defects and agglomeration effects of reduced graphene oxide, complete replacement of graphite with reduced graphene oxide in a battery may not be feasible. In some embodiments of the present disclosure, a relatively small amount of reduced graphene oxide (5% of the total content of the slurry coating) is added to the electrode. As a result, the reduced graphene oxide structure may be stabilized in the battery.
The disclosed technology provides a solution to the technical problems in manufacturing lithium ion batteries. In particular, the present technology provides an improved method of manufacturing a lithium ion battery that includes replacing or minimizing lower capacity materials and inactive binder materials with higher capacity active materials in a slurry disposed at an electrode current collector. The improved method may further comprise applying an electric field to the slurry and the surface of the current collector during the depositing of the slurry onto the surface of the current collector. The electric field may cause polarization attraction and van der waals interactions between the active material and the surface. Minimizing the content of the binder in the slurry may improve electronic and ionic conductivity (electrical and ionic conductivity) in the electrode, thereby increasing the total capacity of the lithium ion battery. By minimizing the binder and applying reduced graphene oxide in the slurry, the ionic and electronic conductivity of the electrode can be improved. Due to the interaction between the reduced graphene oxide and the current collector, the reduced graphene oxide can act as both a binder and an active material, thereby minimizing the need for inactive binder materials in the slurry coating of the lithium ion battery current collector.
FIG. 1A is a block diagram of a system 100A for fabricating electrodes according to some currently used techniques. System 100A may include a coater 110. The system of FIG. 1 is exemplary, and for purposes of this discussion, only selected portions of a typical electrode manufacturing system are shown. The applicator 110 may include a current collector 112, a slurry reservoir 114, a blade 116, and a slurry 118 applied to the current collector. The coater 110 may receive and/or support the current collector 112. The coater 110 may fix the current collector 112 so that the slurry may be applied to the surface thereof. The current collector 112 may comprise a sheet or foil of a material such as copper or aluminum.
The slurry reservoir 114 may apply the slurry in the form of a thin film to the current collector 112 using a slurry applicator device (e.g., blade 116). The blade 116 may be moved along the current collector 112 at a particular height to create a film of a predetermined thickness. The current collector 112 may be composed of different materials depending on the type and application of the electrode. In some embodiments, the anode current collector may be made of copper, and the cathode current collector may be made of aluminum.
Fig. 1B is a block diagram of a system 100B for manufacturing an electrode according to some embodiments of the present disclosure. Similar to the system 100A of FIG. 1A, the system 100B may include a coater 110. The applicator 110 may include a current collector 112, a slurry reservoir 114, a blade 116, and a slurry 118 applied to the current collector. The coater 110 may receive and/or support the current collector 112. The coater 110 may secure the current collector 112 so that its surface may receive the application of the slurry. The current collector 112 may comprise a sheet or foil of a material such as copper or aluminum.
The slurry reservoir 114 may apply the slurry in the form of a thin film onto the current collector 112 using a slurry applicator device (e.g., blade 116). The blade 116 may be moved along the current collector 112 at a particular height to create a thin film of a predetermined thickness. The current collector 112 may be constructed of different materials depending on the type and application of the electrode. In some embodiments, the anode current collector may be made of copper, and the cathode current collector may be made of aluminum.
The slurry 118 deposited onto the surface of the current collector may include an active material. In some embodiments, the active material may include reduced graphene oxide. A more detailed discussion of the slurry components is provided with reference to fig. 5. Additional details regarding the cross-section portion (cross-section) 119 of the slurry and the current collector are provided below with reference to fig. 6, 7A, and 7B.
Similar to the system 100A, the system 100B can include an electric field source 120 to apply an electric field to the slurry within the coater 110 while applying the slurry to the current collector 112. An electric field may be applied to the slurry to induce polarized attraction and van der waals interactions between the particles of the active material and the surface of the current collector, thereby securing contact between the slurry and the surface of the current collector.
The electric field source 120 can be placed, operated and fixed inside or outside the applicator 110. The electric field source 120 may be controlled by an electric field source controller. The electric field source may include a generator or a battery configured to produce direct current. Electric field source 120 can be in contact with blade 116 and current collector 112. In some embodiments, the electric field source may provide a negative charge to the current collector 112 and a positive charge to the blade 116. The electric field between the blade 116 and the current collector 112 may cause an interaction between some particles of the slurry and the surface of the current collector, as shown in fig. 6 and discussed in more detail below. The electric field source controller can manipulate current parameters, such as amperage and voltage, generated by the electric field source 120.
Fig. 2 shows a flow chart of the steps of a method of producing a lithium battery. The method for producing lithium batteries can be used for different types of rechargeable lithium batteries, such as those used in electric cars, telephones and other devices. First, in step 210, an electrode may be constructed. To produce the electrode, a slurry may be produced and placed onto a current collector. When the slurry is placed onto the surface of the current collector, it may be subjected to an electric field. Thereafter, the selected material may be divided into electrodes of appropriate size. More details for producing the electrode are provided below with reference to the method shown in fig. 3.
At step 220, battery cells may be assembled. Assembly of a lithium ion battery cell may include connecting electrodes, inserting an electrode structure into a housing, and constructing an electrode subassembly. The subassembly can then be inserted into the can and the can sealed while leaving an opening for injecting electrolyte into the can. The cell can then be filled with electrolyte and sealed. Then, in step 230, a battery formation (formation) is performed. Battery formation can include subjecting the battery to precisely controlled charge and discharge cycles to activate the active material of the battery and convert it into a usable form.
Fig. 3 shows a flow chart of steps of a method 300 of constructing an electrode. The method of fig. 3 provides additional detail for step 210 of the method of fig. 2. At step 310, the method 300 may generate a cell paste. The mixing of the active material and binder can produce a slurry in which the amount of binder decreases with the active material. The slurry may comprise a solvent. These materials are mixed in a planetary vacuum mixer (planetary vacuum mixer), sometimes with water and/or other materials for a period of time to achieve a completely uniform mix. In some cases, the material was placed in a planetary vacuum mixer for 30 to 40 minutes.
Fig. 4 is a table 400 showing the percent composition of the components of some suitable slurry coatings. The slurry may include an active material and a binder. The active material may form 97% of the slurry solids. The binder may form 3% of the slurry solids. The active material may include graphite and reduced graphene oxide. Graphite may form 92% of the slurry solids. Reduced graphene oxide may form 5% of the slurry solids. In other embodiments, the active material may also include silicon oxide or some other suitable active material for the anode. The binder may comprise SBR, CMC, or some other suitable binder. In some embodiments, the composition percentages of active and other materials in the slurry solids may be different than those shown in fig. 4, depending on the application of the battery and the desired structure in the dried slurry.
Fig. 5 shows a flow chart of steps of a method 500 for producing a slurry. The method 500 of fig. 5 provides more detail for step 310 of the method 300 of fig. 3. At step 510, the method 500 may mix graphite, a binder, and reduced graphene oxide with a solvent comprising water and isopropanol. At step 520, the method 500 may include mixing a mixture of graphite, binder, reduced graphene oxide, water, and isopropanol using a planetary ball mixer for at least 30 minutes. The amount of solids in the resulting structure can be 40%. The solids may include graphite, a binder, and reduced graphene oxide, for example, in a ratio as shown in table 400 of fig. 4. The ratio of water to isopropanol may be 4: 1.
referring again to fig. 3, the method 300 may include a step 320 of disposing the slurry to a surface of the current collector. The slurry may be applied in such a way as to leave a thin film on the surface of the current collector. For example, a doctor blade (also referred to as a knife blade) or other suitable application mechanism may apply the slurry at a thickness appropriate for a particular application. In some embodiments, the slurry may be applied to the current collector using a blade at a thickness of 65 μm.
In step 330, the method 300 may apply an electric field between the blade and the current collector while depositing the slurry onto the surface of the current collector. The configuration process using electric fields is discussed in more detail below with reference to fig. 6, 7A, and 7B.
At step 340, the method 300 may include drying the current collector provided with the slurry to remove the solvent. The slurry on the current collector may be dried at room temperature.
Fig. 6 shows the application of the slurry 114 with active material particles 630 to the current collector 122. The paste 114 and current collector shown in fig. 6 provide more detail to the paste and conductor cross-section 119 shown in fig. 1. The slurry 118 is a mixture of active material and binder. The height h of the slurry on the current collector may be about 65 micrometers (μm), corresponding to the height of the blade used to create the thin film.
The particles 630 may include reduced graphene oxide nanoparticles dispersed throughout the slurry. In some embodiments, an electric field is applied between the blade and the current collector. The electric field strength E may depend on the size of the blade and the type of material thereof, the size of the current collector and the type of material thereof, and the height h. For example, the blade may be made of stainless steel, the current collector may be made of a copper material, the height h may be about 65 μm, and the strength E of the electric field is at least 50 volts.
The electric field may cause polarization attraction and van der waals interactions 640 between the reduced graphene oxide particles 630 and the current collector. The polarization attraction and van der waals interactions 640 may secure the contact between the slurry 114 and the collector surface.
Fig. 7A shows a conventional composition 700A of a slurry disposed on a surface of a current collector 112 of a lithium ion battery. The conventional composition 700A is typically used as a slurry for coating an anode. The conventional composition 700A may include particles 710 of active materials, such as graphite and silicon oxide (SiO), and particles 720 of binder materials, such as SBR and CMC.
Fig. 7B illustrates a slurry composition 700B disposed on a surface of a current collector 112 of a lithium ion battery, according to an embodiment of the present disclosure. Composition 700B can be used as a slurry for coating an anode. The conventional composition 700B may substantially include particles 710 of active materials, such as graphite, silicon oxide (SiO), and reduced graphene oxide. The presence of binder material particles in composition 700B may be eliminated or minimized.
The foregoing detailed description of the technology herein has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the technology to the precise form disclosed. Many modifications and variations are possible in light of the above teaching. The described embodiments were chosen in order to best explain the principles of the technology and its practical application to thereby enable others skilled in the art to best utilize the technology in various embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the present technology be defined by the claims appended hereto.
Claims (20)
1. A system for manufacturing an electrode, the system comprising:
a coater configured to fix a current collector;
a blade configured to dispose a slurry on a surface of the current collector, the slurry including an active material; and
an electric field source configured to apply an electric field between the blade and the current collector, the electric field affecting at least a portion of the structure of the slurry by causing an interaction between the active material and the current collector.
2. The system of claim 1, wherein the active material comprises reduced graphene oxide.
3. The system of claim 1, wherein the electric field is applied to cause van der waals interactions between the active material particles and the surface of the current collector.
4. The system of claim 1, wherein an electric field is applied to induce polarized attraction between the active material particles and the current collector.
5. The system of claim 1, wherein the slurry comprises a 40% solution of solids comprising 92% graphite, 3% binder, and 5% reduced graphene oxide, the solids being dissolved in a 4: 1 in a mixture of water and isopropanol.
6. The system of claim 1, wherein the electric field is continuously applied while the slurry is disposed onto the surface of the current collector.
7. The system of claim 6, wherein:
the blade is configured to dispose the slurry at a thickness of 65 microns; and
the electric field source is configured to apply an electric field of at least 50 volts.
8. The system of claim 1, wherein the electric field source is configured to provide a negative charge to the blade and a positive charge to the current collector.
9. A method of manufacturing an electrode, the method comprising:
disposing a slurry to a surface of a current collector by a blade, the slurry comprising an active material and a solvent;
applying an electric field between the blade and the current collector by an electric field source, the electric field affecting a partial structure of the slurry by causing an interaction between the active material and the current collector; and
drying the slurry disposed on the surface of the current collector to remove the solvent.
10. The method of claim 9, wherein the active material comprises reduced graphene oxide.
11. The method of claim 9, wherein the electric field is applied to cause van der waals interactions between the active material particles and the current collector surface.
12. The method of claim 9, wherein the electric field is applied to induce a polarizing attraction between the particles of the active material and the current collector.
13. The method of claim 9, wherein the slurry comprises a 40% solution of solids comprising 92% graphite, 3% binder, and 5% reduced graphene oxide, the solids being dissolved in a 4: 1 in a mixture of water and isopropanol.
14. The method of claim 9, further comprising mixing the slurry by a planetary ball mixer for 30 minutes.
15. The method of claim 9, wherein the electric field is applied continuously while the slurry is disposed on the surface of a collector sheet.
16. The method of claim 15, wherein:
the blade is configured to dispose the slurry at a thickness of 65 microns; and
the electric field source is configured to apply an electric field of at least 50 volts, and to provide a negative charge to the blade and a positive charge to the current collector.
17. An electrode for a rechargeable battery, the electrode comprising:
a current collector; and
a slurry coating disposed on a surface of the current collector, the slurry coating including an active material, the slurry configured to have a structure that aligns in response to an electric field applied to the slurry and the current collector such that the slurry is disposed on the current collector surface.
18. The electrode of claim 17, wherein the active material comprises reduced graphene oxide.
19. The electrode of claim 17, wherein the electric field is applied to cause one of van der waals interactions and polarized attraction between the active material particles and the current collector surface.
20. The electrode of claim 17, wherein prior to disposing, the slurry comprises a 40% solution of solids comprising 92% graphite, 3% binder, and 5% reduced graphene oxide, the solids being dissolved in a mixture of 4: 1 in a mixture of water and isopropanol.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114628643A (en) * | 2020-12-10 | 2022-06-14 | 北京小米移动软件有限公司 | Method for manufacturing electrode, battery, electronic equipment and drying equipment |
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