CN114024020A - Electrode assembly, battery and equipment - Google Patents

Electrode assembly, battery and equipment Download PDF

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Publication number
CN114024020A
CN114024020A CN202111276879.9A CN202111276879A CN114024020A CN 114024020 A CN114024020 A CN 114024020A CN 202111276879 A CN202111276879 A CN 202111276879A CN 114024020 A CN114024020 A CN 114024020A
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electrode assembly
layer
battery
anode
electrode
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CN202111276879.9A
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Chinese (zh)
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文宝华
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Goertek Techology Co Ltd
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Goertek Optical Technology Co Ltd
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Priority to CN202111276879.9A priority Critical patent/CN114024020A/en
Publication of CN114024020A publication Critical patent/CN114024020A/en
Priority to PCT/CN2022/115037 priority patent/WO2023071483A1/en
Pending legal-status Critical Current

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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
    • 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
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses an electrode assembly, which comprises a plurality of anodes and cathodes which are arranged in a stacked mode, wherein isolating films are respectively arranged between the adjacent anodes and the adjacent cathodes, and the anode positioned on the outermost layer comprises an anode material layer coated on the surface, close to the inner side, of an anode current collecting piece and a mixed slurry layer of lithium iron phosphate and an insulating material coated on the surface, close to the outer side, of the anode current collecting piece. By applying the electrode assembly provided by the invention, the anode at the outermost layer of the electrode assembly adopts a single-sided anode form, and the other side of the single-sided anode adopts a mixed slurry layer of lithium iron phosphate and an insulating material, so that the strength of the electrode assembly and the whole battery using the electrode assembly are greatly increased, and the electrode assembly has good short-circuit resistance, thereby having good protection effect on the battery. In addition, the energy density loss of the battery is small, and the energy density loss can be controlled within 2%. The invention also discloses a battery and equipment with the electrode assembly, and the technical effects are also achieved.

Description

Electrode assembly, battery and equipment
Technical Field
The present invention relates to the field of electronic devices, and more particularly, to an electrode assembly, a battery and a device.
Background
Electronic products are widely used in daily work and life. Batteries are usually required to be arranged in electronic products, and the performance and safety of the batteries have important influence on the quality of the electronic products. Particularly, for the mobile phone consumer market and the power automobile market, the battery safety technology has attracted extensive attention.
At present, mobile phone products pursue high volume energy density, if a positive electrode material adopts high-voltage Lithium Cobaltate (LCO), the energy density of a material system is very high, but the safety performance is poor, so that the safety of the battery in the mobile phone consumer market is not well solved, and particularly, the battery can hardly pass a needling test.
Lithium iron phosphate (LFP) is mostly adopted as a positive electrode material of the power battery, the safety performance of the battery can be ensured to the maximum extent, but the energy density is low, and the power battery can only be suitable for the fields of buses, household energy storage or outdoor base stations and the like with low requirements on the energy density, and is not enough to be applied to the application field of passenger vehicles due to the limited energy density at present.
In summary, how to effectively solve the problems that the safety performance and the energy density of the battery are difficult to be considered at the same time is a problem to be solved by those skilled in the art at present.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an electrode assembly, a battery and a device, in which the structural design of the electrode assembly can effectively solve the problem that the safety performance and the energy density of the battery are difficult to be compatible.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an electrode assembly, includes the anodal and the negative pole of a plurality of range upon range of settings, and adjacent the positive pole with be provided with the barrier film between the negative pole respectively, be located outmost the positive pole is including coating in the anodal current collector and be close to inboard positive material layer on the surface and coating in the anodal current collector is close to the mixed thick liquids layer of the lithium iron phosphate on the surface and insulating material in the outside.
Preferably, in the above electrode assembly, the insulating material is an insulating ceramic.
Preferably, in the above electrode assembly, the insulating material is alumina ceramic.
Preferably, in the above-described electrode assembly, the content of the alumina ceramic in the mixed slurry layer is not more than 5% by mass.
Preferably, in the electrode assembly, the thickness of the dried mixed slurry layer is in a range of 10um to 30 um.
Preferably, in the electrode assembly, the positive electrode material layer is a lithium cobalt oxide layer, a ternary 523 layer, or a ternary 811 layer.
Preferably, in the above electrode assembly, the positive electrode current collector is an aluminum foil.
Preferably, in the above electrode assembly, the negative electrode positioned at the outermost layer is a single-sided negative electrode or a double-sided negative electrode.
The electrode assembly provided by the invention comprises a plurality of anodes and cathodes which are arranged in a laminated mode and a separation film arranged between the adjacent anodes and cathodes. The anode positioned on the outermost layer comprises an anode material layer, a mixed slurry layer of lithium iron phosphate and an insulating material and an anode current collector. The anode material layer is coated on the surface of the anode current collector close to the inner side, and the mixed slurry layer of the lithium iron phosphate and the insulating material is coated on the surface of the anode current collector close to the outer side.
By applying the electrode assembly provided by the invention, the anode on the outermost layer of the electrode assembly adopts a single-sided anode form, and the other side of the single-sided anode adopts the mixed slurry of the lithium iron phosphate with high safety characteristic and the insulating material to coat the surface of the anode current collector, so that the strength of the electrode assembly and the whole battery using the electrode assembly is greatly increased by utilizing the excellent safety performance of the lithium iron phosphate, and meanwhile, the anode current collector on the outermost layer can have good short-circuit resistance by combining the arrangement of the insulating material, thereby playing a good protection role on the battery. In addition, the mixed slurry layer containing the lithium iron phosphate is adopted, so that the energy density loss of the battery is small and can be controlled within 2%. In conclusion, the electrode assembly provided by the invention can obtain good safety performance under the condition of less energy density loss, namely, the battery safety performance and the energy density are well considered.
The present invention also provides a battery including any one of the above electrode assemblies. Since the above-described electrode assembly has the above-described technical effects, a battery having the electrode assembly should also have corresponding technical effects.
The invention also provides equipment which comprises the battery. Since the above battery has the above technical effects, the device having the battery should also have corresponding technical effects.
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 structural view of an electrode assembly according to an embodiment of the present invention;
fig. 2 is a schematic view of the structure of an electrode assembly of a comparative example.
The drawings are numbered as follows:
the lithium iron phosphate battery comprises a single-sided negative electrode 01, a mixed slurry layer 02 of lithium iron phosphate and insulating ceramic, a positive electrode material layer 03, a double-sided negative electrode 04, a double-sided positive electrode 05 and an isolating membrane 06;
a double-sided cathode 001, a double-sided anode 002 and an isolating film 003.
Detailed Description
The embodiment of the invention discloses an electrode assembly, a battery and equipment, which are used for considering both the safety performance and the energy density of the battery.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an electrode assembly according to an embodiment of the present invention.
In one embodiment, the present invention provides an electrode assembly including a positive electrode, a negative electrode, and a separator 06.
The anode and the cathode are stacked in layers, and the isolating film 06 is arranged between the adjacent anode and cathode. As for the structure of the separator 06, the number of stacked positive and negative electrodes, and the like, reference is made to the prior art, and no specific limitation is made here.
The anode positioned on the outermost layer comprises an anode material layer 03, a mixed slurry layer of lithium iron phosphate and an insulating material and an anode current collector. Here, the positive electrode positioned at the outermost layer refers to an electrode assembly in which the whole is stacked, and is positioned at the outer layer for each positive electrode, that is, the structure of the positive electrode positioned at the outermost layer is limited by comparing only the positions of the positive electrodes, and the whole electrode assembly is not limited to the outermost layer.
For the outermost positive electrode, a single-sided positive electrode structure is adopted, namely, a positive electrode material is coated on one side of the positive electrode current collector, and mixed slurry of lithium iron phosphate and an insulating material is adopted on the other side of the positive electrode current collector, and the mixed slurry corresponds to the outer side of the positive electrode current collector. Namely, the anode material layer 03 is coated on the surface of the anode current collector near the inner side, and the mixed slurry layer of the lithium iron phosphate and the insulating material is coated on the surface of the anode current collector near the outer side. The lithium iron phosphate has excellent safety performance, is not exploded during puncture, and is not easy to combust and explode during overcharge.
For other inner layer anodes, a conventional anode arrangement can be used, such as a double-sided anode 05, i.e. a layer of anode material 03 is applied on both sides of the anode collector to obtain a good energy density.
For the structure of each negative electrode, a conventional negative electrode structure may be specifically adopted, and details are not described here. If a double-sided negative electrode is adopted, namely, negative electrode materials are respectively coated on two sides of the negative electrode current collecting piece. As for the negative electrode positioned at the outermost layer, it may be a single-sided negative electrode 01 or a double-sided negative electrode. Similarly, the negative electrode positioned at the outermost layer herein means that the electrode assembly positioned at the outer layer for each negative electrode in the overall stacked arrangement, that is, the position of each negative electrode alone is compared, and the structure thereof positioned at the outermost layer may be a single-sided negative electrode 01 or a double-sided negative electrode. The thickness of the cathode coating on the outermost layer is designed according to the solid content and reversible capacity of the lithium iron phosphate and the coating thickness of the mixed slurry layer.
By applying the electrode assembly provided by the invention, the anode on the outermost layer of the electrode assembly adopts a single-sided anode form, and the other side of the single-sided anode adopts the mixed slurry of the lithium iron phosphate with high safety characteristic and the insulating material to coat the surface of the anode current collector, so that the strength of the electrode assembly and the whole battery using the electrode assembly is greatly increased by utilizing the excellent safety performance of the lithium iron phosphate, and meanwhile, the anode current collector on the outermost layer can have good short-circuit resistance by combining the arrangement of the insulating material, thereby playing a good protection role on the battery. In addition, the mixed slurry layer containing the lithium iron phosphate is adopted, so that the energy density loss of the battery is small and can be controlled within 2%. In conclusion, the electrode assembly provided by the invention can obtain good safety performance under the condition of less energy density loss, namely, the battery safety performance and the energy density are well considered.
Specifically, the insulating material is insulating ceramic, that is, a mixed slurry layer 02 of lithium iron phosphate and insulating ceramic is used. The insulating ceramic has good insulating property and better mechanical property. Specifically, the insulating material is alumina ceramic. The alumina ceramic material has the characteristics of excellent insulativity, small thermal expansion coefficient, high mechanical strength, good thermal conductivity and the like. At the same time, it has excellent wear resistance. Therefore, the aluminum oxide ceramic and the lithium iron phosphate are mixed, so that the strength of the whole battery is greatly increased, and meanwhile, the outermost positive collector plate can play a good short-circuit resistance role. The specific components, i.e., the corresponding contents, etc., of the alumina ceramic may be set as required, and are not specifically limited herein.
Further, the content of alumina ceramic in the mixed slurry layer is not more than 5% by mass. Namely, in the mixed slurry of the lithium iron phosphate and the alumina ceramic, the content of the alumina ceramic is not more than 5% by mass, and the content of the alumina ceramic is controlled within the above range, so that the safety of the battery can be improved, and the influence on the energy density of the battery is small.
On the basis of the above embodiments, the thickness range of the dried mixed slurry layer is 10um-30 um. Namely, after the mixed slurry of lithium iron phosphate and alumina ceramic is coated on the positive current collector and dried, the thickness of the formed mixed slurry layer of lithium iron phosphate and alumina ceramic is within the range of 10-30 um. Because the coating thickness is less than 10um, to the improvement effect of security relatively poor, and energy density loss is too big again when the coating is too thick, so through the thickness control that mixes the thick liquids layer in 10um-30um within range, the influence of the lifting machine of security to energy density can be fine compromise.
In each of the above embodiments, the positive electrode material layer 03 may be specifically a lithium cobalt oxide layer, a ternary 523 layer, or a ternary 811 layer. Three-element 523 layers, LiNi0.5Co0.2Mn0.3O2A layer; ternary 811 layers, i.e. LiNi0.8Co0.1Mn0.1O2And (3) a layer. Of course, other conventional cathode materials may be used for the cathode material layer 03 as needed. The positive current collecting piece is specifically an aluminum foil, and the negative current collecting piece is specifically a copper foil.
In order to more clearly illustrate the electrode assembly provided in the present application, which has excellent safety, a specific example and a conventional electrode assembly structure as comparative examples are illustrated below.
In one embodiment, referring to fig. 1, fig. 1 is a schematic structural diagram of an electrode assembly according to an embodiment of the invention. In this embodiment, the electrode assembly includes a plurality of positive electrodes and negative electrodes stacked one on another with a separator 06 disposed between adjacent positive and negative electrodes. The anode positioned on the outermost layer comprises an anode material layer 03 coated on the surface, close to the inner side, of the anode current collecting piece and a mixed slurry layer 02 of lithium iron phosphate and insulating ceramic coated on the surface, close to the outer side, of the anode current collecting piece. The negative electrode positioned at the outermost layer also adopts a single-sided negative electrode 01 structure. The middle anode and cathode are stacked with a double-sided anode 05 and a double-sided cathode 04, respectively.
In a comparative example, referring to fig. 2, fig. 2 is a schematic structural view of an electrode assembly of the comparative example. In the comparative example, the electrode assembly includes a plurality of positive electrodes and negative electrodes stacked in layers with a separator 003 disposed between the adjacent positive and negative electrodes. Each layer of positive electrode adopts a double-sided positive electrode 002 structure, and each layer of negative electrode adopts a double-sided negative electrode 001 structure.
Taking the electrode assembly applied to a 5Ah mobile phone battery as an example, the test results of the electrode assembly shown in fig. 1 and the electrode assembly shown in fig. 2 are shown in table 1.
Table 1 comparison of test results of electrode assemblies of the present invention with comparative electrode assemblies
Figure BDA0003329733280000061
Figure BDA0003329733280000071
It can be seen that the electrode assembly of the present invention can greatly improve the safety performance of needle punching and weight impact as well as heat abuse at 140 c and 150 c.
Based on the electrode assembly provided in the above embodiment, the present invention also provides a battery including any one of the electrode assemblies in the above embodiments. Since the battery employs the electrode assembly in the above embodiment, the advantageous effects of the battery refer to the above embodiment.
When the battery is manufactured, corresponding coating is carried out according to the structure of the electrode assembly, a positive electrode material is coated on the positive electrode on the outermost layer of the battery, then mixed slurry of lithium iron phosphate and an insulating material is coated on the other surface of the positive electrode, the thickness of the dried positive electrode is controlled by drying after coating, all prepared electrode plates are assembled after coating of all the electrode plates is completed, and the process after assembly is consistent with that of conventional battery production.
Based on the battery provided in the above embodiment, the present invention also provides an apparatus including the battery in any one of the above embodiments. Since the device uses the battery in the above embodiment, please refer to the above embodiment for the beneficial effect of the device.
Specifically, the device may be an electronic device, such as a 3C consumer digital device like a mobile phone or a computer, or an electric device like a power automobile.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides an electrode assembly, includes the anodal and the negative pole of a plurality of range upon range of settings, and adjacent the positive pole with be provided with barrier film (06) between the negative pole respectively, its characterized in that is located outmost the positive pole is close to inboard positive material layer (03) on the surface and coats in positive current collector is close to the mixed thick liquids layer of the surperficial lithium iron phosphate and insulating material in the outside.
2. The electrode assembly of claim 1, wherein the insulating material is an insulating ceramic.
3. The electrode assembly of claim 1, wherein the insulating material is an alumina ceramic.
4. The electrode assembly according to claim 3, wherein the content of the alumina ceramic in the mixed slurry layer is not more than 5% by mass.
5. The electrode assembly of any of claims 1-4, wherein the thickness of the mixed slurry layer after drying is in the range of 10um to 30 um.
6. The electrode assembly according to claim 1, wherein the positive electrode material layer (03) is a lithium cobaltate layer, a ternary 523 layer, or a ternary 811 layer.
7. The electrode assembly of claim 1, wherein the positive electrode current collector is an aluminum foil.
8. The electrode assembly according to claim 1, wherein the negative electrode positioned at the outermost layer is a single-sided negative electrode (01) or a double-sided negative electrode.
9. A battery comprising an electrode assembly according to any one of claims 1 to 8.
10. A device comprising a battery according to any of claims 1-9.
CN202111276879.9A 2021-10-29 2021-10-29 Electrode assembly, battery and equipment Pending CN114024020A (en)

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JP2019067619A (en) * 2017-09-29 2019-04-25 株式会社村田製作所 Secondary battery
CN210224171U (en) * 2019-07-15 2020-03-31 比亚迪股份有限公司 Outermost layer utmost point piece unit, battery and core, module and package and vehicle thereof
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