CN110828771A - Electrode pole piece, preparation method thereof and lithium ion battery - Google Patents
Electrode pole piece, preparation method thereof and 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
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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
- H01M4/043—Processes of manufacture in general involving compressing or compaction
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- H—ELECTRICITY
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- 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
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- H—ELECTRICITY
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- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
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Abstract
The application belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery pole piece, a preparation method thereof and a lithium ion battery. The preparation method of the electrode plate comprises the following steps: and fusing the electrode mixture and the conductive fibers of the electrode current collector in a hot pressing mode to form the electrode piece. According to the preparation method of the lithium ion battery pole piece, the conductive fibers are used as the electrode current collector, the weight of the pole piece is reduced, compaction of the positive electrode and the negative electrode can be improved, on the other hand, the conductive fibers and the electrode mixture are fused in a hot pressing mode, the process is simple, the manufacturing procedure of the battery core is simplified, the fusion degree of the conductive fibers and the electrode mixture is high, and a thinner battery core pole piece can be obtained, so that the energy density of the battery core is improved, and the capacity of a single battery is further improved.
Description
Technical Field
The application belongs to the technical field of lithium ion batteries, and particularly relates to an electrode plate, a preparation method thereof and a lithium ion battery.
Background
The existing lithium ion battery is divided into a cylindrical lithium ion battery, a square lithium ion battery and a soft package lithium ion battery according to the appearance of the battery, wherein the weight of the soft package battery is 40% lighter than that of a steel shell battery with the same capacity, the weight of the soft package battery is 20% lighter than that of an aluminum shell battery, the capacity of the soft package battery is 10-15% higher than that of the steel shell battery with the same specification and size, and the capacity of the soft package battery is 5-10% higher than that of the aluminum shell battery, so that the soft. How to further improve the capacity of the single battery and give consideration to the performance of the battery becomes a great challenge.
At present, besides the capacity of a single battery is improved by using a positive and negative electrode active material with higher gram capacity, many attempts are made on the structure of a battery inner part, for example, a thinner foil is used as a current collector, but the thinner foil means the sacrifice of tensile strength. In order to improve the product competitiveness in the market, higher single cell energy density is needed, the requirement on the compaction density of the positive and negative plates is higher and higher, the tensile strength of the thin foil is insufficient, and the thin foil is easy to break under high compaction.
Therefore, it is necessary to develop a new lithium ion battery electrode plate and a lithium ion battery, which can further improve the capacity of the single battery and also give consideration to the battery performance.
Disclosure of Invention
The application provides a lithium ion battery electrode plate, a preparation method thereof and a lithium ion battery, which can further improve the capacity of a single battery and give consideration to the performance of the battery.
One aspect of the present application provides a method for preparing an electrode sheet, including: and fusing the electrode mixture and the conductive fibers of the electrode current collector in a hot pressing mode to form the electrode piece.
In some embodiments of the present application, the electrode mix is a positive electrode mix, and the electrode current collector conductive fibers are positive electrode current collector conductive fibers.
In some embodiments of the present application, the positive electrode mix comprises: the composite material comprises a positive electrode active material, a positive electrode conductive agent, a positive electrode binder and a positive electrode solvent, wherein the mass ratio of the positive electrode active material to the positive electrode conductive agent to the positive electrode binder to the positive electrode solvent is (92-97) to (2-5) to (3-6) to (35-50).
In some embodiments of the present application, the positive active material includes: any one or more of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium vanadium phosphate, ternary materials and/or manganese-rich materials.
In some embodiments of the present application, the positive electrode conductive agent includes: conductive carbon black, conductive graphite, carbon fiber, carbon nanotube, graphene, and mixed conductive slurry thereof.
In some embodiments of the present application, the electrode mix is a negative electrode mix, and the electrode current collector conductive fibers are negative electrode current collector conductive fibers.
In some embodiments of the present application, the negative electrode mix comprises: the negative electrode comprises a negative electrode active material, a negative electrode conductive agent, a negative electrode binder and a negative electrode solvent, wherein the mass ratio of the negative electrode active material to the negative electrode conductive agent to the negative electrode binder to the negative electrode solvent is (92-97) to (1-3) to (3-5) to (55-65).
In some embodiments of the present application, the negative active material comprises: any one or more of a graphite material, a silicon material, a tin material, lithium titanate and/or a two-dimensional graphene material.
In some embodiments of the present application, the negative electrode conductive agent comprises: any one or more of conductive carbon black, conductive graphite, carbon fiber, carbon nanotube, graphene and mixed conductive slurry thereof.
In some embodiments of the present application, the electrode current collector conductive fibers comprise: any one or more of metal fibers, carbon black fibers, conductive metal compound fibers and conductive polymer fibers.
In some embodiments of the present application, the hot pressing temperature of the hot pressing manner is 60-80 ℃, the hot pressing pressure is 200-.
An aspect of the present application also provides an electrode tab, including: electrode mixture; and the electrode mixture is thermally fused into the electrode current collector conductive fibers.
In some embodiments of the present application, the electrode mix is a positive electrode mix, and the electrode current collector conductive fibers are positive electrode current collector conductive fibers.
In some embodiments of the present application, the electrode mix is a negative electrode mix, and the electrode current collector conductive fibers are negative electrode current collector conductive fibers.
In some embodiments of the present application, the electrode current collector conductive fibers comprise: any one or more of metal fibers, carbon black fibers, conductive metal compound fibers and conductive polymer fibers.
Another aspect of the present application provides a lithium ion battery, including an electrode plate prepared by the above-mentioned preparation method of a battery electrode plate.
According to the lithium ion battery electrode piece, the preparation method thereof and the lithium ion battery, the conductive fibers are used as the electrode current collectors, the weight of the electrode piece is reduced, compaction of the positive electrode and the negative electrode can be improved, on the other hand, the conductive fibers and the electrode mixture are fused in a hot pressing mode, the process is simple, the manufacturing procedure of the battery core is simplified, the fusion degree of the conductive fibers and the electrode mixture is high, and a thinner battery core electrode piece can be obtained, so that the energy density of the battery core is improved, and the capacity of a single battery is further improved.
Drawings
The following drawings describe in detail exemplary embodiments disclosed in the present application. Wherein like reference numerals represent similar structures throughout the several views of the drawings. Those of ordinary skill in the art will understand that the present embodiments are non-limiting, exemplary embodiments and that the accompanying drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of the present disclosure, as other embodiments may equally fulfill the inventive intent of the present application. It should be understood that the drawings are not to scale. Wherein:
FIG. 1 is a flow chart of a method for preparing an electrode sheet according to an embodiment of the present disclosure.
Detailed Description
The following description is presented to enable any person skilled in the art to make and use the present disclosure, and is provided in the context of a particular application and its requirements. Various local modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present disclosure. Thus, the present disclosure is not to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the claims.
The technical solution of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.
The embodiment of the application provides a preparation method of an electrode plate, which comprises the following steps: and fusing the electrode mixture and the conductive fibers of the electrode current collector in a hot pressing mode to form the electrode piece.
FIG. 1 is a flow chart of a method for preparing an electrode sheet according to an embodiment of the present disclosure. The preparation method comprises the following steps:
step S1, preparing raw materials of the electrode mixture;
step S2, preparing the raw materials into an electrode mixture;
and step S3, combining the electrode mixture and the electrode current collector conductive fibers in a hot-pressing mode.
In the step S1, the performance of the electrode mix directly affects the performance of the battery cell, such as energy density, cycle life, rate, and storage, so that an appropriate electrode mix is important for the battery, and the type and mass ratio of each raw material of the electrode mix are particularly important.
In the embodiment of the application, the electrode mixture can be a positive electrode mixture or a negative electrode mixture, and when the electrode mixture is the positive electrode mixture, the electrode current collector conductive fiber is a positive electrode current collector conductive fiber, and the positive electrode mixture and the positive electrode current collector conductive fiber are used for manufacturing a positive electrode piece.
In some embodiments of the present application, the positive electrode mix comprises: the composite material comprises a positive electrode active material, a positive electrode conductive agent, a positive electrode binder and a positive electrode solvent, wherein the mass ratio of the positive electrode active material to the positive electrode conductive agent to the positive electrode binder to the positive electrode solvent is (92-97) to (2-5) to (3-6) to (35-50).
The positive electrode active material is used for combining with lithium ions and releasing the lithium ions, and is a key material for completing the functions of the battery, and the more the positive electrode active material is, the more lithium ions can be theoretically accommodated, the larger the capacity of the battery is, and therefore, the mass proportion of the positive electrode active material in the positive electrode mixture should be as large as possible under the condition that the conditions allow.
In some embodiments of the present application, the positive active material includes: any one or more of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium vanadium phosphate, ternary materials and/or manganese-rich materials. The cathode active material has stable electrochemical performance, is used in a battery, and has the advantages of large discharge capacity, low price, no memory and the like.
The positive electrode conductive agent is used for ensuring that the positive electrode of the battery has good charge and discharge performance, and can play a role in collecting micro-current between positive electrode active materials and between the positive electrode active materials and the conductive fibers of the positive electrode current collector, so that the contact resistance of the positive electrode is reduced, the moving speed of electrons is accelerated, and meanwhile, the migration speed of lithium ions in a positive electrode mixture can be effectively improved, and the charge and discharge efficiency of the positive electrode is improved. In the case of ensuring the function of the positive electrode conductive agent, the mass ratio of the positive electrode conductive agent in the positive electrode slurry should be reduced as much as possible to increase the mass ratio of the positive electrode active material.
In some embodiments of the present application, the positive electrode conductive agent includes: any one or more of conductive carbon black, conductive graphite, carbon fiber, carbon nanotube and graphene. The different conductive agents have different conductive properties, and the mass ratio of the conductive agent in the positive electrode mixture and the selection of the type of the conductive agent can be specifically coordinated according to the consideration of cost.
The positive electrode binder is used for enhancing the binding strength of other components in the positive electrode mixture and improving the good adhesion of the positive electrode mixture and an adhesion matrix. Also, in the case of ensuring the function of the cathode binder, the mass ratio of the cathode binder in the cathode slurry should be reduced as much as possible to increase the mass ratio of the cathode active material.
In some embodiments of the present application, the positive electrode binder comprises: one or more of Polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF) and styrene butadiene rubber (E-SBR).
The positive electrode solvent is used for dissolving and uniformly mixing all components of the positive electrode mixture, and similarly, the mass ratio of the positive electrode solvent in the positive electrode mixture is only required to be capable of just realizing the function of the positive electrode solvent. The excessive positive electrode solvent can reduce the mass ratio of the positive electrode active material, and can also cause the positive electrode mixture to be too thin, so that the positive electrode mixture and the conductive fibers of the positive electrode current collector are inconvenient to be combined together by hot pressing.
In some embodiments of the present application, the cathode solvent comprises: deionized water or N-methylpyrrolidone.
In the embodiment of the application, the electrode mixture can be a positive electrode mixture or a negative electrode mixture, and when the electrode mixture is a negative electrode mixture, the electrode current collector conductive fibers are negative electrode current collector conductive fibers, and the negative electrode mixture and the negative electrode current collector conductive fibers are used for manufacturing a negative electrode plate.
In some embodiments of the present application, the negative electrode mix comprises: the negative electrode comprises a negative electrode active material, a negative electrode conductive agent, a negative electrode binder and a negative electrode solvent, wherein the mass ratio of the negative electrode active material to the negative electrode conductive agent to the negative electrode binder to the negative electrode solvent is (92-97) to (1-3) to (3-5) to (55-65).
The negative electrode active material is used for combining with lithium ions and releasing the lithium ions, and is a key material for completing the battery function, the more the negative electrode active material is, the more lithium ions can be theoretically accommodated, the larger the capacity of the battery is, and therefore, the mass proportion of the negative electrode active material in the negative electrode mixture should be as large as the conditions allow.
In some embodiments of the present application, the negative active material comprises: any one or more of a graphite material, a silicon material, a tin material, lithium titanate and/or a two-dimensional graphene material. The negative electrode conductive agent is used for ensuring that the negative electrode of the battery has good charge and discharge performance, and can play a role in collecting micro-current between negative electrode active materials and between the negative electrode active materials and the negative electrode current collector conductive fibers so as to reduce the contact resistance of the negative electrode, accelerate the movement rate of electrons, and effectively improve the migration rate of lithium ions in a negative electrode mixture, thereby improving the charge and discharge efficiency of the negative electrode.
In some embodiments of the present application, the negative electrode conductive agent comprises: any one or more of conductive carbon black, conductive graphite, carbon fiber, carbon nanotube and graphene.
The negative electrode binder is used for enhancing the binding strength of other components in the negative electrode mixture and improving the good adhesion of the positive electrode mixture and the adhesion matrix.
In some embodiments of the present application, the anode binder comprises: one or more of Polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF) and styrene butadiene rubber (E-SBR).
The negative electrode solvent is used for dissolving and uniformly mixing all components of the negative electrode mixture, and excessive solvent can reduce the mass ratio of the negative electrode active material and can also cause the negative electrode mixture to be too thin, so that the negative electrode mixture and the conductive fibers of the negative electrode current collector are inconvenient to combine together by hot pressing.
In some embodiments of the present application, the negative electrode solvent comprises: deionized water or N-methylpyrrolidone.
After the preparation of the raw material in step S1 is completed, step S2 is performed to prepare the raw material into an electrode mix.
In some embodiments of the present application, the method of preparing the raw materials into the electrode mix is: and stirring the binder and the solvent in advance to prepare a glue solution, uniformly mixing the electrode active material and the conductive agent, adding the prepared glue solution, and stirring to obtain a paste electrode mixture.
In the embodiments described herein, the electrode mix may be a positive electrode mix or a negative electrode mix.
And step S3, combining the electrode mixture and the electrode current collector conductive fibers in a hot-pressing mode. And (3) combining the pasty electrode mixture with the electrode current collector conductive fibers which are regularly arranged, and obtaining the electrode plate.
In some embodiments of the present application, the electrode current collector conductive fibers comprise: any one or more of metal fibers, carbon black fibers, conductive metal compound fibers and conductive polymer fibers. The traditional battery core production process takes copper foil as an electrode current collector, the foil occupies 1/3-2/3 of the thickness of an electrode, the mass and volume ratio of an electrode active substance is influenced, and the improvement of the energy density of the battery core is greatly influenced.
In some embodiments of the present application, the current collector conductive fibers have a diameter of 2 to 16 microns.
Compared with the traditional process, the hot pressing method is adopted, on one hand, a homogenization dilution stage and a coating stage in the traditional process are skipped, and the active material and the electrode current collector are directly rolled and molded, so that the production process is simplified, the energy consumption is reduced, and the production efficiency is effectively improved; on the other hand, the product quality can be adjusted and controlled by adjusting the hot pressing parameters, so that the product quality is easier to control; in addition, the conductive fiber treated in the way has higher fusion degree with the electrode mixture and better product quality.
In some embodiments of the present application, the hot pressing temperature of the hot pressing manner is 60-80 ℃, the hot pressing pressure is 200-.
In some embodiments of the present application, the thickness of the electrode sheet can be adjusted by adjusting the hot-pressing parameters, thereby adjusting the cell energy density.
Exemplary embodiment 1
Step S1, weighing lithium cobaltate, conductive carbon black, polyvinylidene fluoride and N-methyl pyrrolidone, wherein the mass ratio of the lithium cobaltate to the conductive carbon black to the polyvinylidene fluoride to the N-methyl pyrrolidone is 93: 3: 4: 45, and the lithium cobaltate to the conductive carbon black to the polyvinylidene fluoride to the N-methyl pyrrolidone are used as raw materials of a positive electrode mixture; weighing graphite, conductive carbon black, polyvinylidene fluoride and N-methyl pyrrolidone, wherein the mass ratio of the graphite to the conductive carbon black to the polyvinylidene fluoride to the N-methyl pyrrolidone is 95: 1: 4: 60 as a raw material of the negative electrode mix.
Step S2, stirring polyvinylidene fluoride and N-methyl pyrrolidone in advance to prepare a glue solution, uniformly mixing lithium cobaltate and conductive carbon black, adding the glue solution prepared in advance, and stirring to obtain a paste-like positive electrode mixture; stirring polyvinylidene fluoride and N-methyl pyrrolidone in advance to prepare a glue solution, uniformly mixing graphite and conductive carbon black, adding the glue solution prepared in advance, and stirring to obtain a paste negative electrode mixture.
Step S3, carrying out hot pressing combination on the paste-shaped positive electrode mixture and positive electrode current collector conductive fibers which are regularly arranged and have the diameters of 3 microns to obtain a positive electrode plate, wherein the hot pressing temperature of the hot pressing mode is 74 ℃, the hot pressing pressure is 220t, and the hot pressing time is 15S; and (3) carrying out hot pressing on the paste negative electrode mixture and a certain regularly arranged negative electrode current collector conductive fiber with the diameter of 3 microns to obtain a negative electrode sheet, wherein the hot pressing temperature of the hot pressing mode is 78 ℃, the hot pressing pressure is 260t, and the hot pressing time is 20 s.
Exemplary embodiment 2
Step S1, weighing lithium cobaltate, conductive carbon black, polyvinylidene fluoride and N-methyl pyrrolidone, wherein the mass ratio of the lithium cobaltate to the conductive carbon black to the polyvinylidene fluoride to the N-methyl pyrrolidone is 94: 3: 45 as the raw material of the anode mixture; weighing graphite, conductive carbon black, polyvinylidene fluoride and N-methyl pyrrolidone, wherein the mass ratio of the graphite to the conductive carbon black to the polyvinylidene fluoride to the N-methyl pyrrolidone is 95.5: 1: 3.5: 60, and using the graphite, the conductive carbon black to the polyvinylidene fluoride to serve as a raw material of a negative electrode mixture.
Step S2, stirring polyvinylidene fluoride and N-methyl pyrrolidone in advance to prepare a glue solution, uniformly mixing lithium cobaltate and conductive carbon black, adding the glue solution prepared in advance, and stirring to obtain a paste-like positive electrode mixture; stirring polyvinylidene fluoride and N-methyl pyrrolidone in advance to prepare a glue solution, uniformly mixing graphite and conductive carbon black, adding the glue solution prepared in advance, and stirring to obtain a paste negative electrode mixture.
Step S3, carrying out hot pressing combination on the paste-shaped positive electrode mixture and positive electrode current collector conductive fibers which are regularly arranged and have the diameters of 4 microns to obtain a positive electrode plate, wherein the hot pressing temperature of the hot pressing mode is 74 ℃, the hot pressing pressure is 320t, and the hot pressing time is 20S; and (3) carrying out hot pressing on the paste negative electrode mixture and a certain regularly arranged negative electrode current collector conductive fiber with the diameter of 4 microns to obtain a negative electrode sheet, wherein the hot pressing temperature of the hot pressing mode is 72 ℃, the hot pressing pressure is 370t, and the hot pressing time is 25 s.
Exemplary embodiment 3
Step S1, weighing lithium cobaltate, conductive carbon black, polyvinylidene fluoride and N-methyl pyrrolidone, wherein the mass ratio of the lithium cobaltate to the conductive carbon black to the polyvinylidene fluoride to the N-methyl pyrrolidone is 92: 4: 50, and the lithium cobaltate to the conductive carbon black to the polyvinylidene fluoride to the N-methyl pyrrolidone are used as raw materials of a positive electrode mixture; weighing graphite, conductive carbon black, polyvinylidene fluoride and N-methyl pyrrolidone, wherein the mass ratio of the graphite to the conductive carbon black to the polyvinylidene fluoride to the N-methyl pyrrolidone is 96: 1: 3: 65, and using the graphite, the conductive carbon black to the polyvinylidene fluoride to serve as a raw material of a negative electrode mixture.
Step S2, stirring polyvinylidene fluoride and N-methyl pyrrolidone in advance to prepare a glue solution, uniformly mixing lithium cobaltate and conductive carbon black, adding the glue solution prepared in advance, and stirring to obtain a paste-like positive electrode mixture; stirring polyvinylidene fluoride and N-methyl pyrrolidone in advance to prepare a glue solution, uniformly mixing graphite and conductive carbon black, adding the glue solution prepared in advance, and stirring to obtain a paste negative electrode mixture.
Step S3, carrying out hot pressing combination on the paste-shaped positive electrode mixture and positive electrode current collector conductive fibers which are regularly arranged and have the diameter of 5 microns to obtain a positive electrode plate, wherein the hot pressing temperature of the hot pressing mode is 64 ℃, the hot pressing pressure is 430t, and the hot pressing time is 30S; and (3) carrying out hot pressing on the paste negative electrode mixture and a certain regularly arranged negative electrode current collector conductive fiber with the diameter of 5 microns to obtain a negative electrode sheet, wherein the hot pressing temperature of the hot pressing mode is 68 ℃, the hot pressing pressure is 450t, and the hot pressing time is 20 s.
According to the preparation method of the lithium ion battery pole piece, the conductive fibers are used as the electrode current collector, the weight of the pole piece is reduced, compaction of the positive electrode and the negative electrode can be improved, on the other hand, the conductive fibers and the electrode mixture are fused in a hot pressing mode, the process is simple, the manufacturing procedure of the battery core is simplified, the fusion degree of the conductive fibers and the electrode mixture is high, and a thinner battery core pole piece can be obtained, so that the energy density of the battery core is improved, and the capacity of a single battery is further improved.
The embodiment of the present application further provides an electrode plate, including: electrode mixture; and the electrode mixture is thermally fused into the electrode current collector conductive fibers.
In some embodiments of the present application, the thermal fusion is a hot press process. Compared with the traditional process, the electrode mixture and the conductive fibers of the electrode current collector are combined in a hot pressing mode, a homogenization dilution stage and a coating stage in the traditional process are skipped, the active material and the electrode current collector are directly formed in a rolling mode, the production process is simplified, the risk of the coating process is avoided, the product quality can be improved, the energy consumption is reduced, and the production efficiency is effectively improved.
In some embodiments of the present application, the electrode mix is a positive electrode mix, and the electrode current collector conductive fibers are positive electrode current collector conductive fibers. The positive electrode mixture includes: the composite material comprises a positive electrode active material, a positive electrode conductive agent, a positive electrode binder and a positive electrode solvent, wherein the mass ratio of the positive electrode active material to the positive electrode conductive agent to the positive electrode binder to the positive electrode solvent is (92-97) to (2-5) to (3-6) to (35-50).
In some embodiments of the present application, the electrode mix is a negative electrode mix, and the electrode current collector conductive fibers are negative electrode current collector conductive fibers. The negative electrode mix includes: the negative electrode comprises a negative electrode active material, a negative electrode conductive agent, a negative electrode binder and a negative electrode solvent, wherein the mass ratio of the negative electrode active material to the negative electrode conductive agent to the negative electrode binder to the negative electrode solvent is (92-97) to (1-3) to (3-5) to (55-65).
In some embodiments of the present application, the current collector conductive fibers comprise: any one or more of metal fibers, carbon black fibers, conductive metal compound fibers and conductive polymer fibers. The traditional battery core production process takes copper foil as an electrode current collector, the foil occupies 1/3-2/3 of the thickness of an electrode, the mass and volume ratio of an electrode active substance is influenced, and the improvement of the energy density of the battery core is greatly influenced.
In some embodiments of the present application, the current collector conductive fibers have a diameter of 2 to 16 microns.
The application provides a lithium ion battery pole piece uses conductive fiber as the electrode mass flow body, has reduced pole piece weight, and can improve positive negative pole compaction, and on the other hand fuses conductive fiber and electrode mixture through the hot pressing mode, and simple process has simplified electric core preparation process, and conductive fiber and electrode mixture degree of fusion are high, can obtain thinner electric core pole piece to improve electric core energy density, and then improve the battery cell capacity.
The embodiment of the application also provides a lithium ion battery, which comprises the electrode pole piece prepared by the preparation method of the battery pole piece.
In some embodiments of the present application, a method of making the lithium ion battery comprises: and (3) laminating the positive plate and the negative plate after die cutting with a diaphragm, wherein the conductive fibers of the current collector of the positive plate are twisted together to be bound into a positive circuit port, the conductive fibers of the current collector of the negative plate are twisted together to be bound into a negative circuit port, and then assembling and injecting electrolyte to obtain the lithium ion battery.
According to the lithium ion battery, the electrode pole piece uses the conductive fibers as the electrode current collector, the weight of the pole piece is reduced, compaction of the positive electrode and the negative electrode can be improved, on the other hand, the conductive fibers and the electrode mixture are fused in a hot pressing mode, the process is simple, the manufacturing process of the battery core is simplified, the fusion degree of the conductive fibers and the electrode mixture is high, and a thinner battery pole piece can be obtained, so that the energy density of the battery core is improved, and the capacity of a single battery is further improved.
In conclusion, upon reading the present detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure can be presented by way of example only, and not limitation. Those skilled in the art will appreciate that the present application is intended to cover various reasonable variations, adaptations, and modifications of the embodiments described herein, although not explicitly described herein. Such alterations, improvements, and modifications are intended to be suggested by this disclosure, and are within the spirit and scope of the exemplary embodiments of this disclosure.
It is to be understood that the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present.
Similarly, it will be understood that when an element such as a layer, region or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, the term "directly" means that there are no intervening elements. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It will be further understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a first element in some embodiments may be termed a second element in other embodiments without departing from the teachings of the present invention. The same reference numerals or the same reference identifiers denote the same elements throughout the specification.
Further, exemplary embodiments are described by referring to cross-sectional illustrations and/or plan illustrations that are idealized exemplary illustrations. Accordingly, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, example embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have rounded or curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of exemplary embodiments.
Claims (16)
1. A preparation method of an electrode plate comprises the following steps:
and fusing the electrode mixture and the conductive fibers of the electrode current collector in a hot pressing mode to form the electrode piece.
2. The preparation method of the electrode plate according to claim 1, wherein the electrode mixture is a positive electrode mixture, and the electrode current collector conductive fibers are positive electrode current collector conductive fibers.
3. The method of manufacturing according to claim 2, wherein the positive electrode mix includes: the anode material comprises an anode active material, an anode conductive agent, an anode binder and an anode solvent, wherein the mass ratio of the anode active material to the anode conductive agent to the anode binder to the anode solvent is (92-97) to (2-5) to (3-6) to (35-50).
4. The production method according to claim 3, wherein the positive electrode active material includes: any one or more of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium vanadium phosphate, ternary materials and/or manganese-rich materials.
5. The production method according to claim 3, wherein the positive electrode conductive agent comprises: any one or more of conductive carbon black, conductive graphite, carbon fiber, carbon nanotube and graphene.
6. The preparation method of the electrode plate as claimed in claim 1, wherein the electrode mixture is a negative electrode mixture, and the electrode current collector conductive fibers are negative electrode current collector conductive fibers.
7. The preparation method according to claim 6, wherein the negative electrode mix includes: the cathode comprises a cathode active material, a cathode conductive agent, a cathode binder and a cathode solvent, wherein the mass ratio of the cathode active material to the cathode conductive agent to the cathode binder to the cathode solvent is (92-97) to (1-3) to (3-5) to (55-65).
8. The preparation method according to claim 7, wherein the negative active material comprises: any one or more of a graphite material, a silicon material, a tin material, lithium titanate and/or a two-dimensional graphene material.
9. The method of manufacturing according to claim 7, wherein the negative electrode conductive agent includes: any one or more of conductive carbon black, conductive graphite, carbon fiber, carbon nanotube and graphene.
10. The method of manufacturing of claim 1, wherein the electrode current collector conductive fibers comprise: any one or more of metal fibers, carbon black fibers, conductive metal compound fibers and conductive polymer fibers.
11. The method as claimed in claim 1, wherein the hot-pressing temperature of the hot-pressing method is 60-80 ℃, the hot-pressing pressure is 200-.
12. An electrode sheet comprising:
electrode mixture;
and the electrode current collector conductive fibers, wherein the electrode mixture is thermally fused into the electrode current collector conductive fibers.
13. The electrode sheet according to claim 12, wherein the electrode mixture is a positive electrode mixture, and the electrode current collector conductive fibers are positive electrode current collector conductive fibers.
14. The electrode sheet of claim 12, wherein the electrode mix is a negative mix and the electrode current collector conductive fibers are negative current collector conductive fibers.
15. The electrode sheet of claim 12, wherein the electrode current collector conductive fibers comprise: any one or more of metal fibers, carbon black fibers, conductive metal compound fibers and conductive polymer fibers.
16. A lithium ion battery, wherein an electrode plate of the lithium ion battery is prepared by the method of any one of claims 1 to 11.
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| CN114824173A (en) * | 2022-06-10 | 2022-07-29 | 蜂巢能源科技(无锡)有限公司 | Dry electrode pole piece, preparation method thereof and application of dry electrode pole piece in energy storage battery |
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