WO2020177623A1 - Pièce à pôle négatif, batterie secondaire et appareil associé - Google Patents

Pièce à pôle négatif, batterie secondaire et appareil associé Download PDF

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Publication number
WO2020177623A1
WO2020177623A1 PCT/CN2020/077137 CN2020077137W WO2020177623A1 WO 2020177623 A1 WO2020177623 A1 WO 2020177623A1 CN 2020077137 W CN2020077137 W CN 2020077137W WO 2020177623 A1 WO2020177623 A1 WO 2020177623A1
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Prior art keywords
negative electrode
conductive agent
coating
active material
negative
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PCT/CN2020/077137
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English (en)
Chinese (zh)
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梁成都
曾毓群
闫传苗
柳金华
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宁德时代新能源科技股份有限公司
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Publication of WO2020177623A1 publication Critical patent/WO2020177623A1/fr

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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
    • 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
    • H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • This application relates to the field of batteries, in particular to a negative electrode sheet, a secondary battery and a device thereof.
  • the purpose of the present application is to provide a negative electrode sheet, a secondary battery and a device thereof, the secondary battery having both high specific energy and excellent dynamic performance.
  • the present application provides a negative electrode sheet, which includes a negative electrode current collector and a negative electrode membrane arranged on the negative electrode current collector, the negative electrode membrane comprising a first coating Layer and a second coating layer, the first coating layer is disposed on the negative electrode current collector and includes a first negative electrode active material and a first conductive agent, and the second coating layer is disposed on the first coating layer away from the
  • the negative electrode current collector is on the surface and includes a second negative electrode active material and a second conductive agent.
  • the first negative electrode active material and the second negative electrode active material are carbon materials with different graphitization degrees, and the graphitization degree of the first negative electrode active material is greater than the graphitization degree of the second negative electrode active material.
  • the mass percentage of the first conductive agent in the first coating layer is less than the mass percentage of the second conductive agent in the second coating layer.
  • the present application provides a secondary battery including the negative electrode sheet described in the first aspect of the present application.
  • this application relates to a device including the secondary battery described in the second aspect of this application.
  • This application includes at least the following beneficial effects: This application can reasonably match the types and contents of the negative electrode active material and the conductive agent in the first coating and the second coating of the negative film during the design of the negative electrode.
  • the secondary battery has both high specific energy and excellent dynamic performance.
  • the device of the present application includes the secondary battery described in the second aspect of the present application, and thus has at least the same advantages as the secondary battery.
  • FIG. 1 is a schematic diagram of an embodiment of the secondary battery of this application.
  • FIG. 2 is a schematic diagram of an embodiment of the battery module of this application.
  • FIG. 3 is a schematic diagram of an embodiment of the battery pack of this application.
  • Figure 4 is an exploded view of Figure 3;
  • FIG. 5 is a schematic diagram of an embodiment of a device using a secondary battery as a power source of this application;
  • the negative electrode sheet according to the first aspect of the present application includes a negative electrode current collector and a negative electrode membrane provided on the negative electrode current collector.
  • the negative electrode membrane comprises a first coating and a second coating, and the first coating is provided On the negative current collector and including a first negative active material and a first conductive agent, the second coating is disposed on the surface of the first coating away from the negative current collector and includes a second negative active material And the second conductive agent.
  • the first negative electrode active material and the second negative electrode active material are carbon materials with different graphitization degrees, and the graphitization degree of the first negative electrode active material Greater than the graphitization degree of the second negative electrode active material.
  • the graphitization degree of the first negative electrode active material and the second negative electrode active material can be calculated according to the following formula:
  • g is the degree of graphitization
  • d 002 is the interlayer spacing of the (002) crystal plane of the carbon material, and the unit of measurement is nm.
  • the surface anisotropy of carbon materials with a high degree of graphitization is usually greater.
  • the unevenness of the reduction and decomposition reaction of the electrolyte on the surface of the carbon material increases, resulting in the formation of SEI on the surface of the negative electrode.
  • the membrane is loose and porous and cannot effectively block the co-intercalation of solvated ions, which may lead to the collapse of the carbon material structure.
  • the diffusion speed of ions along the ab-axis plane in the highly graphitized carbon material is greater than that along the c-axis direction, the insertion of ions is carried out at the boundary of the carbon material.
  • the boundary area of the highly graphitized carbon material is small and the particles There is a large mutual barrier effect between them, which will cause a great kinetic hindrance to the diffusion of ions in the highly graphitized carbon material, and cannot be charged and discharged at a faster rate.
  • the secondary battery has poor kinetic performance. problem.
  • the negative electrode membrane is only a single-layer structure and the carbon material has a high degree of graphitization, although it is beneficial to ion intercalation of the carbon material, it is beneficial to increase the specific energy of the secondary battery, but the layer spacing of the carbon material d 002 is small, which may hinder the diffusion of ions in the carbon material, so that the secondary battery cannot be charged and discharged at a faster rate, and the dynamic performance of the secondary battery is poor.
  • the negative electrode membrane is only a single-layer structure and the degree of graphitization of the carbon material is low, although it is beneficial to the diffusion of ions in the carbon material, the secondary battery can be charged and discharged at a faster rate.
  • using a carbon material with a low degree of graphitization as a negative electrode active material may not be conducive to the specific energy of the secondary battery.
  • the addition of a conductive agent to the single-layer structure of the negative electrode film can achieve the purpose of improving the dynamic performance of the secondary battery, since the conductive agent is usually an inactive material, the increase in the content of the inactive material in the negative electrode film means The decrease in the content of the active material will therefore impair the specific energy of the secondary battery.
  • the negative electrode membrane of the present application has a multilayer structure, and the first negative electrode active material in the first coating layer provided on the negative electrode current collector has a high degree of graphitization, which enables the secondary battery to have the characteristics of high specific energy;
  • the second negative electrode active material in the second coating layer on the first coating layer has a low graphitization degree, which can compensate for the problem of poor dynamic performance of the secondary battery caused by the high graphitization degree of the first negative electrode active material. Therefore, the secondary battery using the negative electrode film with the multilayer structure of the present application can have both high specific energy and excellent dynamic performance.
  • the graphitization degree of the first negative electrode active material is 90% to 99.5%.
  • the graphitization degree of the second negative electrode active material is 80%-98.5%.
  • the first negative electrode active material is selected from one or more of artificial graphite, natural graphite, soft carbon, hard carbon, and mesocarbon microspheres.
  • the second negative electrode active material is selected from one or more of artificial graphite, natural graphite, soft carbon, hard carbon, and mesocarbon microspheres.
  • the mass percentage of the first conductive agent in the first coating layer is less than the mass percentage of the second conductive agent in the second coating layer.
  • the addition of the first conductive agent and the second conductive agent can improve the dynamic performance of the secondary battery, especially when the second coating contains a larger amount of the second conductive agent, the second coating as a high-kinetic transition layer can further Improve the dynamic performance of the secondary battery.
  • the content of the first conductive agent and the second conductive agent existing as inactive materials is small, it is not conducive to improving the dynamic performance of the secondary battery; and the first conductive agent existing as inactive materials
  • the content of the conductive agent and the second conductive agent is continuously increasing, and the content of the first negative electrode active material and the second negative electrode active material is correspondingly reduced, which is not conducive to increasing the specific energy of the secondary battery.
  • the mass percentage of the first conductive agent in the first coating is 0.5% to 3%. Further preferably, the mass percentage of the first conductive agent in the first coating is 1% to 2%.
  • the mass percentage of the second conductive agent in the second coating is 1% to 6%. Further preferably, the mass percentage of the second conductive agent in the second coating is 2% to 5%.
  • the mass percentage of the first conductive agent in the first coating layer and the second conductive agent in the second coating layer The ratio of the mass percentage content is 1:(1.2 ⁇ 6).
  • the secondary can be balanced while reducing the amount of conductive agent as much as possible
  • the specific energy and dynamic performance of the battery enable the secondary battery to take into account both high specific energy and excellent dynamic performance.
  • the ratio of the mass percentage of the first conductive agent in the first coating to the mass percentage of the second conductive agent in the second coating is 1:(1.5 ⁇ 3).
  • the conductivity of the first conductive agent is lower than the conductivity of the second conductive agent.
  • the negative electrode film of the present application has a multi-layer structure. When the conductivity of the second conductive agent in the second coating layer is greater than that of the first conductive agent in the first coating layer, it can be more conducive to ions in the negative electrode. The extraction and embedding in the diaphragm ensure that the secondary battery has excellent dynamic performance.
  • the conductivity of the first conductive agent is 10 S/cm to 100 S/cm. Further preferably, the electrical conductivity of the first conductive agent is 10 S/cm to 50 S/cm.
  • the conductivity of the second conductive agent is 30 S/cm to 200 S/cm. Further preferably, the conductivity of the second conductive agent is 40 S/cm to 150 S/cm.
  • the first conductive agent is selected from one or more of conductive carbon black, carbon nanotubes, carbon nanofibers, and graphene.
  • the second conductive agent is selected from one or more of conductive carbon black, carbon nanotubes, carbon nanofibers, and graphene.
  • the second coating layer as a high-kinetic transition layer should not be too thick .
  • the ratio of the thickness of the first coating to the thickness of the second coating is (1-10):1.
  • the ratio of the thickness of the first coating to the thickness of the second coating is (1-5):1.
  • the first coating layer further includes a first binder and a first dispersant, and the types of the first binder and the first dispersant are not specifically limited , Can be selected according to actual needs.
  • the first binder may be selected from one of polyacrylic acid, sodium polyacrylate, sodium alginate, polyacrylonitrile, polyethylene glycol, carboxymethyl chitosan, and styrene butadiene rubber (SBR) Or several; preferably, the first dispersant may be selected from sodium carboxymethyl cellulose (CMC).
  • the second coating layer further includes a second binder and a second dispersant, and the types of the second binder and the second dispersant are not specifically limited , Can be selected according to actual needs.
  • the second binder may be selected from one of polyacrylic acid, sodium polyacrylate, sodium alginate, polyacrylonitrile, polyethylene glycol, carboxymethyl chitosan, and styrene butadiene rubber (SBR) Or several; preferably, the second dispersant may be selected from sodium carboxymethyl cellulose (CMC).
  • first adhesive and the second adhesive can be the same or different, and can be selected according to actual needs.
  • the type of the negative electrode current collector is not specifically limited, and can be selected according to actual needs.
  • the negative electrode current collector can be copper foil or stainless steel foil, preferably ,
  • the negative electrode current collector is copper foil.
  • the preparation method of the negative electrode sheet may include the steps:
  • the secondary battery according to the second aspect of the present application includes a positive electrode sheet, a negative electrode sheet, an electrolyte, and a separator, wherein the negative electrode sheet is the negative electrode sheet according to the first aspect of the present application.
  • the type of the separator is not specifically limited, and can be selected according to actual needs.
  • the isolation film may be polyethylene, polypropylene, polyvinylidene fluoride and their multilayer composite film, but is not limited to these.
  • the type of the electrolyte is not specifically limited, and can be selected according to actual needs.
  • the secondary battery according to the second aspect of the present application may be a lithium ion battery, a sodium ion battery, or any other secondary battery using the negative electrode sheet according to the first aspect of the present application.
  • the secondary battery according to the second aspect of the present application is a lithium ion battery.
  • the positive electrode active material in the positive electrode sheet may be selected from lithium transition metal composite oxides.
  • the positive electrode active material can be selected from lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium nickel cobalt manganese oxide, lithium nickel manganese oxide, lithium nickel cobalt aluminum oxide, and lithium iron phosphate.
  • lithium cobalt oxide lithium manganese oxide, lithium nickel oxide, lithium nickel cobalt manganese oxide, lithium nickel manganese oxide, lithium nickel cobalt aluminum oxide, and lithium iron phosphate.
  • the secondary battery may include an outer package for packaging the positive pole piece, the negative pole piece, and the electrolyte.
  • the positive pole piece, the negative pole piece and the separator can be laminated or wound to form a laminated structure electrode assembly or a wound structure electrode assembly, the electrode assembly is packaged in an outer package; the electrolyte can be an electrolyte, which is infiltrated In the electrode assembly.
  • the number of electrode assemblies in the secondary battery can be one or several, which can be adjusted according to requirements.
  • the outer packaging of the secondary battery may be a soft bag, such as a pouch type soft bag.
  • the material of the soft bag can be plastic, for example, it can include one or more of polypropylene (PP), polybutylene terephthalate (PBT), polybutylene succinate (PBS), and the like.
  • the outer packaging of the secondary battery may also be a hard case, such as an aluminum case.
  • Fig. 1 shows an electrochemical device 5 with a square structure as an example.
  • the secondary battery can be assembled into a battery module, and the number of electrochemical devices contained in the battery module can be multiple, and the specific number can be adjusted according to the application and capacity of the battery module.
  • Fig. 2 is a battery module 4 as an example.
  • a plurality of secondary batteries 5 may be arranged in order along the length direction of the battery module 4. Of course, it can also be arranged in any other manner. Furthermore, the plurality of secondary batteries 5 can be fixed by fasteners.
  • the battery module 4 may further include a housing having an accommodation space, and a plurality of secondary batteries 5 are accommodated in the accommodation space.
  • the above-mentioned battery modules can also be assembled into a battery pack, and the number of battery modules contained in the battery pack can be adjusted according to the application and capacity of the battery pack.
  • Figures 3 and 4 show the battery pack 1 as an example. 3 and 4, the battery pack 1 may include a battery box and a plurality of battery modules 4 provided in the battery box.
  • the battery box includes an upper box body 2 and a lower box body 3.
  • the upper box body 2 can be covered on the lower box body 3 and forms a sealed space for accommodating the battery module 4.
  • Multiple battery modules 4 can be arranged in the battery box in any manner.
  • the device includes the secondary battery described in the second aspect of the present application.
  • the secondary battery provides power to the device.
  • the device can be, but is not limited to, mobile devices (such as mobile phones, laptop computers, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf Vehicles, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.
  • the device can select an electrochemical device, a battery module or a battery pack according to its usage requirements.
  • Figure 5 is a device as an example.
  • the device is a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle.
  • battery packs or battery modules can be used.
  • the device may be a mobile phone, a tablet computer, a notebook computer, etc.
  • the device is generally required to be thin and light, and a secondary battery can be used as a power source.
  • a lithium ion battery is taken as an example, and the application is further described in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the application and not to limit the scope of the application.
  • the lithium ion batteries of Examples 1-4 and Comparative Examples 1-5 were prepared according to the following methods.
  • the positive electrode active material LiNi 0.8 Co 0.1 Mn 0.1 O 2 , the conductive agent acetylene black, and the binder PVDF were mixed in a mass ratio of 96:2:2, and the solvent NMP was added, and the system was stirred under the action of a vacuum mixer until the system was uniform.
  • Positive electrode slurry uniformly coat the positive electrode slurry on the positive electrode current collector aluminum foil, dry at room temperature and transfer to an oven to continue drying, and then undergo cold pressing and slitting to obtain a positive electrode sheet.
  • the second negative electrode active material, the second conductive agent, the second binder, and the second dispersant shown in Table 2 are dispersed in deionized water in proportion, and stirred until the system is uniform to obtain the second negative electrode slurry;
  • the extrusion coating equipment coats the first negative electrode slurry on the copper foil of the negative electrode current collector to form a first coating. After drying, coats the second negative electrode slurry on the first coating to form a second coating. After drying, transfer to an oven to continue drying, and then undergo cold pressing and slitting to obtain a negative electrode sheet.
  • Ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) are mixed in a volume ratio of 1:1:1 to obtain an organic solvent, and then the fully dried lithium salt LiPF 6 is dissolved in the mixed
  • the latter organic solvent is formulated into an electrolyte with a concentration of 1 mol/L.
  • a polyethylene film is selected as the isolation film.
  • the lithium ion battery At room temperature, the lithium ion battery is charged to the upper limit voltage at a rate of 1/3C, and then discharged to the lower limit voltage at a rate of 1/3C to obtain the energy during the discharge process of the lithium ion battery.
  • Examples 1-4 reasonably matched the types and contents of the negative active material and the conductive agent in the first coating and the second coating in the negative film of the lithium ion battery during the design of the negative film. , Can make the lithium ion battery have both high specific energy and excellent dynamic performance.
  • the negative electrode membrane has a single-layer structure, and the negative electrode active material is artificial graphite with a high degree of graphitization. Although it is beneficial to the insertion of lithium ions and is beneficial to increase the specific energy of the lithium ion battery, Comparative Example 1
  • the artificial graphite used has a small interlayer spacing d 002 , which may hinder the diffusion of lithium ions and cannot improve the dynamic performance of the lithium ion battery.
  • the negative electrode film has a multilayer structure.
  • the first coating uses artificial graphite with a lower graphitization degree
  • the second coating uses soft carbon with a higher graphitization degree.
  • the content of the conductive agent is higher than the content of the second conductive agent in the second coating. At this time, the specific energy of the lithium ion battery is lower, and the dynamic performance of the lithium ion battery is also poor.
  • the negative electrode membrane has a multi-layer structure
  • the first coating is made of natural graphite with a low degree of graphitization
  • the second coating is made of hard carbon with a high degree of graphitization
  • the first coating is the first
  • the content of the conductive agent is higher than the content of the second conductive agent in the second coating. At this time, the specific energy of the lithium ion battery is lower, and the dynamic performance of the lithium ion battery is also poor.
  • the negative electrode membrane has a multilayer structure
  • the first coating uses natural graphite with a low degree of graphitization
  • the second coating uses mesocarbon microspheres with a high degree of graphitization
  • the second coating Relative to the first coating layer is set too thick, the specific energy of the lithium ion battery is lower at this time, and the dynamic performance of the lithium ion battery is also poor.
  • the negative electrode membrane has a multilayer structure.
  • the first coating uses natural graphite with a low degree of graphitization, and the second coating uses artificial graphite with a high degree of graphitization.
  • the first coating is relatively If the coating is too thick, the specific energy of the lithium-ion battery is low, and the dynamic performance of the lithium-ion battery is also poor.

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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
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  • Inorganic Chemistry (AREA)
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Abstract

La présente invention concerne une pièce à pôle négatif, une batterie secondaire et un appareil associé. La pièce à pôle négatif comprend un collecteur de courant négatif et une membrane négative placée sur le collecteur de courant négatif ; la membrane négative comprend un premier revêtement et un second revêtement ; le premier revêtement est placé sur le collecteur de courant négatif et comprend un premier matériau actif négatif et un premier agent conducteur ; le second revêtement est placé sur la surface du premier revêtement à l'opposé du collecteur de courant négatif et comprend un second matériau actif négatif et un second agent conducteur. Le premier matériau actif négatif et le second matériau actif négatif sont des matériaux carbonés ayant des degrés de graphitisation différents, et le degré de graphitisation du premier matériau actif négatif est supérieur au degré de graphitisation du second matériau actif négatif. La teneur massique en pourcentage du premier agent conducteur dans le premier revêtement est inférieure à la teneur massique en pourcentage du second agent conducteur dans le second revêtement. La pièce à pôle négatif selon la présente invention peut permettre à la batterie secondaire d'avoir une énergie spécifique élevée et d'excellentes performances dynamiques.
PCT/CN2020/077137 2019-03-01 2020-02-28 Pièce à pôle négatif, batterie secondaire et appareil associé WO2020177623A1 (fr)

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CN201910155561.1A CN111640940A (zh) 2019-03-01 2019-03-01 负极片及二次电池
CN201910155561.1 2019-03-01

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CN116830315A (zh) * 2021-11-23 2023-09-29 宁德时代新能源科技股份有限公司 一种电极组件、二次电池、电池模块、电池包及用电装置
WO2024087068A1 (fr) * 2022-10-26 2024-05-02 宁德新能源科技有限公司 Appareil électrochimique et dispositif électronique

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