WO2023093576A1 - Pièce polaire et batterie au lithium-ion - Google Patents

Pièce polaire et batterie au lithium-ion Download PDF

Info

Publication number
WO2023093576A1
WO2023093576A1 PCT/CN2022/132059 CN2022132059W WO2023093576A1 WO 2023093576 A1 WO2023093576 A1 WO 2023093576A1 CN 2022132059 W CN2022132059 W CN 2022132059W WO 2023093576 A1 WO2023093576 A1 WO 2023093576A1
Authority
WO
WIPO (PCT)
Prior art keywords
protective layer
pole piece
current collector
thickness
layer
Prior art date
Application number
PCT/CN2022/132059
Other languages
English (en)
Chinese (zh)
Inventor
张健
彭冲
Original Assignee
珠海冠宇电池股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 珠海冠宇电池股份有限公司 filed Critical 珠海冠宇电池股份有限公司
Publication of WO2023093576A1 publication Critical patent/WO2023093576A1/fr

Links

Images

Classifications

    • 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
    • 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
    • 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
    • H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary 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
    • 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

  • the application relates to a pole piece and a lithium ion battery, and relates to the technical field of electrochemistry.
  • Lithium-ion batteries are widely used in smartphones, laptops, Bluetooth, wearable devices and other fields due to their advantages such as high platform voltage, high energy density, no memory effect, and long life.
  • advantages such as high platform voltage, high energy density, no memory effect, and long life.
  • mechanical damage such as acupuncture, heavy impact, etc.
  • an internal short circuit will occur, and a large amount of heat will be released in a short period of time, causing the lithium-ion battery to catch fire and fail. big security risk.
  • the present application provides a pole piece, which is used to solve the problem that the safety and electrical performance of lithium-ion batteries cannot be balanced.
  • the application also provides a lithium ion battery, which has better safety and electrical performance.
  • the first aspect of the present application provides a pole piece, including a base, the base includes a current collector and a protective layer provided on the surface of the current collector, and an active material layer is also provided on the protective layer;
  • the protective layer includes 62%-96% of inactive materials, 0.1%-8% of conductive agent, and 3%-30% of binder according to mass percentage;
  • the thickness H1 of the protective layer and the D50 of the inactive material satisfy the relationship H1 ⁇ 2*D50;
  • the thickness H1 of the protective layer and the D90 of the inactive material satisfy the relationship H1 ⁇ D90;
  • the thickness H1 of the protective layer and the thickness H2 of the active material layer satisfy the relationship H1/H2 ⁇ 1/5.
  • the inactive material includes inorganic particles and/or organic particles, wherein:
  • the inorganic particles include one or more of oxides, carbides, nitrides, inorganic salts, and first carbon coating materials, and the first carbon coating materials include first matrix particles and coated on the A first carbon layer on at least part of the surface of the first base particle, wherein the first base particle is selected from one or more of oxides, carbides, nitrides, and inorganic salts;
  • the organic particles include one or more of polystyrene, polymethyl methacrylate, polytetrafluoroethylene, and a second carbon coating material, and the second carbon coating material includes a second matrix particle and a coating A second carbon layer covering at least part of the surface of the second base particle, wherein the second base particle is selected from one or more of polystyrene, polymethyl methacrylate, and polytetrafluoroethylene.
  • the oxide is selected from at least one of alumina, titanium oxide, magnesium oxide, zirconium oxide, stimbine, barium oxide, manganese oxide, silicon oxide, iron oxide, and ferroferric oxide.
  • the carbide includes metal carbide and/or non-metal carbide, and the metal carbide includes at least one of titanium carbide, calcium carbide, chromium carbide, tantalum carbide, vanadium carbide, zirconium carbide, and tungsten carbide
  • the non-metallic carbides include boron carbide and/or silicon carbide
  • the nitrides include metal nitrides and/or non-metal nitrides
  • the metal nitrides include lithium nitride, magnesium nitride, aluminum nitride, At least one of titanium nitride and tantalum nitride
  • the non-metallic nitride includes at least one of boron nitride, phospho
  • the thickness H1 of the protective layer and the D10 of the inactive material satisfy a relationship H1 ⁇ 8 ⁇ D10.
  • D10 ⁇ 0.5 ⁇ m, D50 ⁇ 2 ⁇ m, and D90 ⁇ 5 ⁇ m of the inactive material are provided.
  • the D10 of the inactive material is 0.01-0.2 ⁇ m
  • the D50 is 0.05-0.5 ⁇ m
  • the D90 is 1-3 ⁇ m.
  • the protective layer has a thickness of 0.1 ⁇ m-10 ⁇ m.
  • the pole piece is a positive pole piece.
  • At least one of the first end and the second end of the pole piece, the vertical distance from the protective layer to the outer edge of the current collector is smaller than the distance from the active material layer to the the vertical distance of the outer edge of the current collector, the first end and the second end are opposite; or,
  • the active material layer includes a first part, and the first part and the first part A connected second part, the first part is arranged on the surface of the protective layer, and the second part is arranged on the surface of the current collector in the empty foil area.
  • the second aspect of the present application provides a lithium-ion battery, including any one of the pole pieces described above.
  • the pole piece provided by the application includes a protective layer, and controls the mass fraction of each component in the protective layer, the relationship between the thickness of the protective layer and the particle size of the inactive material and the thickness of the active material layer, which not only effectively solves the problem of lithium-ion batteries Problems such as fire time limit caused by mechanical abuse, etc., while keeping the electrical performance of lithium-ion batteries basically unaffected, solve the problem that the safety and electrical performance of lithium-ion batteries cannot be balanced.
  • the lithium ion battery provided by this application has good safety and electrical performance.
  • Fig. 1 is a schematic structural diagram of a pole piece provided by an embodiment of the present application
  • Fig. 2 is a schematic structural diagram of a pole piece provided by another embodiment of the present application.
  • the first aspect of the present application provides a pole piece, including a base, the base includes a current collector and a protective layer arranged on the surface of the current collector, and an active material layer is also arranged on the protective layer;
  • the protective layer includes 62%-96% of inactive materials, 0.1%-8% of conductive agent, and 3%-30% of binder according to mass percentage;
  • the thickness H1 of the protective layer and the D50 of the inactive material satisfy the relationship H1 ⁇ 2*D50;
  • the thickness H1 of the protective layer and the D90 of the inactive material satisfy the relationship H1 ⁇ D90;
  • the thickness H1 of the protective layer and the thickness H2 of the active material layer satisfy the relationship H1/H2 ⁇ 1/5.
  • the application provides a pole piece, including a base, the base includes a current collector and a protective layer arranged on the surface of the current collector, the protective layer is also provided with an active material layer, and the current collector is used in the pole piece to attach the protective layer material, active material
  • the base metal of other materials, including two surfaces for attaching protective layer materials, active materials and other materials, the protective layer is set on the surface of the current collector, the current collector and the protective layer constitute the base of the pole piece, and the protective layer is also set There is an active material layer.
  • the application selects the inactive material as the main component of the protective layer.
  • Relative function in the charging and discharging process of lithium-ion batteries, it will not continue to deteriorate and affect the use of lithium-ion batteries, reduce the impact of the protective layer on the cycle stability of lithium-ion batteries, and take into account the electrical properties of lithium-ion batteries; inactive materials are used as protection
  • the main component of the layer 200 mainly plays the role of supporting the protective layer. When the content of the inactive material is too low, the structural stability of the protective layer will be poor, and it will be destroyed by the action of the active material layer in the subsequent coating process of the active material layer.
  • the protective layer is crushed under pressure, so the mass percentage of the inactive material should not be lower than 62%; it can be understood that the protective layer 200 also includes binder and Conductive agent, binder is used to bond inactive materials, conductive agents and other components together to form a coating, and to bond the protective layer with the current collector to improve the stability of the protective layer and the relationship between it and the current collector Adhesive force, thereby improving the stability and safety of the pole piece.
  • binder is used to bond inactive materials, conductive agents and other components together to form a coating, and to bond the protective layer with the current collector to improve the stability of the protective layer and the relationship between it and the current collector Adhesive force, thereby improving the stability and safety of the pole piece.
  • binder is too low, it cannot play a bonding role, which is not conducive to the good adhesion of the protective layer on the current collector.
  • the binder Excessively high content will easily cause the pole piece to become brittle, reduce the compaction density, and affect the energy density of the lithium-ion battery; the conductive agent can build an electronic conductive network, especially when the protective layer is located between the current collector and the active material layer.
  • the electronic pathway between the current collector and the active material layer is conducive to the function of the current collector and improves the performance of the electrode sheet. If the content is too low, the electrical conductivity of the protective layer will be insufficient, which will affect the electrical properties of the electrode sheet. If the mass content of the conductive agent is too large, it will also affect the protective function of the protective layer on the pole piece to a certain extent.
  • the protective layer When an internal short circuit occurs, the protective layer has high conductivity, and it contacts with the pole piece of the other polarity. It will cause severe heat generation at the short circuit point and cause thermal runaway. Therefore, in order to take into account the safety and electrical performance of the lithium-ion battery, the protective layer includes 62%-96% of inactive materials, 0.1%-8% of Conductive agent, 3%-30% binder, that is, the total mass of the protective layer is 100%, the mass of inactive materials is 62%-96% of the total mass of the protective layer, and the mass of the conductive agent is the total mass of the protective layer 0.1%-8% of the total mass of the adhesive, and the mass of the binder is 3%-30% of the total mass of the protective layer.
  • the inactive material is a key factor for the protection support.
  • the inactive material in the protective layer At least two layers on the plane perpendicular to the current collector can have a good protective effect, so the thickness H1 of the protective layer and the average particle size D50 of the inactive material need to satisfy H1 ⁇ 2 ⁇ D50.
  • the protective layer evenly distribute at least two inactive material particles in its thickness direction (direction perpendicular to the surface of the current collector), which is equivalent to forming at least two single-layer protective layers (each single-layer protective layer
  • the average number of inactive material particles in the thickness direction of the layer is one), which is more conducive to the function of the protective layer and improves the safety of the pole piece
  • the thickness H1 of the protective layer and the D90 of the inactive material satisfy H1 ⁇ D90, thus ensuring protection
  • the particle size of more than 90% of the particles in the layer is lower than the thickness of the protective layer, effectively avoiding the occurrence of coating scraping, avoiding the phenomenon of foil leakage, and improving the processing performance of the protective layer
  • D50 is in the volume-based particle size distribution, inactive The particle diameter at which the material reaches 50% of the volume accumulation from the small particle diameter side
  • D90 is the particle diameter at which the inactive material reaches 90% of the volume accumulation from the small particle diameter side in the volume-based particle size distribution.
  • the thickness H1 of the protective layer is equal to the thickness H2 of the active material layer. The relationship satisfies H1/H2 ⁇ 1/5.
  • the pole piece provided by the application includes a protective layer, and controls the mass fraction of each component in the protective layer, the relationship between the thickness of the protective layer and the particle size of the inactive material and the thickness of the active material layer, which can not only effectively improve the safety of lithium-ion batteries Especially in the event of mechanical abuse, reduce the probability of lithium-ion battery fire failure, improve the pass rate of lithium-ion battery nail penetration test, and keep the electrical performance of lithium-ion battery basically unaffected, solve the problem of lithium-ion battery safety and The problem that the electrical performance cannot be taken into account.
  • the inactive material comprises inorganic particles and/or organic particles, wherein:
  • the inorganic particles include one or more of oxides, carbides, nitrides, inorganic salts, and first carbon coating materials, and the first carbon coating materials include first matrix particles and coated on the A first carbon layer on at least part of the surface of the first base particle, wherein the first base particle is selected from one or more of oxides, carbides, nitrides, and inorganic salts;
  • the oxide is selected from at least one of aluminum oxide, titanium oxide, magnesium oxide, zirconium oxide, stibnite, barium oxide, manganese oxide, silicon oxide, iron oxide, and ferroferric oxide;
  • Carbides include metal carbides and/or non-metal carbides, the metal carbides include at least one of titanium carbide, calcium carbide, chromium carbide, tantalum carbide, vanadium carbide, zirconium carbide, tungsten carbide, the non-metal Carbides include boron carbide and/or silicon carbide;
  • the nitrides include metal nitrides and/or non-metal nitrides, and the metal nitrides include lithium nitride, magnesium nitride, aluminum nitride, titanium nitride, nitride At least one of tantalum nitride, the non-metallic nitride includes at least one of boron nitride, phosphorus pentanitri
  • the organic particle is a tiny particle composed of a polymer material, such as one or more of polystyrene, polymethyl methacrylate, polytetrafluoroethylene, and a second carbon coating material, and the second carbon
  • the coating material includes a second matrix particle and a second carbon layer coated on at least part of the surface of the second matrix particle, and the second matrix particle is selected from polystyrene, polymethyl methacrylate, polytetrafluoroethylene one or more.
  • the thickness H1 of the protective layer and the D10 of the inactive material meet H1 ⁇ 8 ⁇ D10, and the selection of inactive materials in this particle size range helps to make the protective layer have enough small particles Material filling improves the compactness of the protective layer.
  • D10 is the particle size of inactive materials starting from the small particle size side and reaching 10% of the volume accumulation in the volume-based particle size distribution.
  • the thickness of the protective layer is 0.1 ⁇ m-10 ⁇ m
  • the D10 of the inactive material is ⁇ 0.5 ⁇ m
  • the D50 is ⁇ 2 ⁇ m
  • the D90 is ⁇ 5 ⁇ m.
  • the inactive material The D10 is 0.01-0.2 ⁇ m
  • the D50 is 0.05-0.5 ⁇ m
  • the D90 is 1-3 ⁇ m.
  • the binder and conductive agent in the protective layer can be conventional materials in the art, for example, the binder includes polyvinylidene fluoride (PVDF), carboxylic acid modified polyvinylidene fluoride (PVDF), polymethyl methacrylate ( PMMA), polyacrylonitrile (PAN), polyacrylic esters, polyimide (PI) in one or more, wherein, the PVDF of carboxylic acid modification comprises the PVDF of acrylic acid modification;
  • Conductive agent comprises conductive carbon One or more of black, acetylene black, graphite, graphene, carbon nanotubes, carbon nanofibers, those skilled in the art can select appropriate materials and mix them with inactive materials to obtain a protective layer slurry, and coat On the surface of the current collector, a protective layer is obtained after drying.
  • the coating length of the protective layer and the active material layer on the surface of the current collector is not further limited in this application.
  • the active material layer can be located entirely on the surface of the protective layer away from the current collector, or partially on the surface of the protective layer away from the current collector. Specifically, at least one of the first end and the second end of the pole piece, the vertical distance from the protective layer to the outer edge of the current collector is smaller than the vertical distance from the active material layer to the outer edge of the current collector distance, the first end and the second end are opposite; or,
  • the active material layer includes a first part, and the first part and the first part A connected second part, the first part is arranged on the surface of the protective layer, and the second part is arranged on the surface of the current collector in the empty foil area.
  • FIG. 1 is a schematic structural diagram of a pole piece provided by an embodiment of the present application.
  • the active material layer 300 that is, the vertical distance from the protective layer 200 to the outer edge of the current collector 100 is smaller than the vertical distance from the active material layer 300 to the outer edge of the current collector 100;
  • FIG. 2 is a schematic structural diagram of a pole piece provided by another embodiment of the present application , as shown in Figure 2, the pole piece includes a current collector 100, a protective layer 200 and an active material layer 300, the protective layer 200 is located on the upper surface of the current collector 100, the active material layer 300 includes two parts, the first part of the active material layer 300 is located in the protective The layer 200 is away from the upper surface of the current collector, and the second part of the active material layer 300 is located on the upper surface of the current collector without a protective layer.
  • Figure 1-2 shows the arrangement of the protective layer and active material layer on the upper surface of the current collector.
  • the arrangement of the other surface of the current collector 100 may be the same as or different from the upper surface.
  • the lower surface of the current collector 100 may be provided with a protective layer 200 and an active material layer 300, or only the active material layer 300 may be provided, but the surface of the current collector 100 Among the two surfaces, at least one surface should be provided with a protective layer 200 , which can be provided by those skilled in the art according to actual needs, which is not further limited in this application.
  • the above-mentioned pole piece can be a positive pole piece or a negative pole piece.
  • the pole piece when the pole piece is a positive pole piece, it includes a positive electrode current collector, a protective layer and a positive electrode active material layer.
  • the pole piece when the pole piece is a negative pole piece, it includes a negative electrode current collector, a protective layer layer and negative electrode active material layer, wherein the positive electrode current collector can be aluminum foil composed of aluminum as the main component, or a composite current collector formed by pressing aluminum foil and other materials (such as polymer materials, etc.), or a composite current collector comprising aluminum foil and a composite current collector of a conductive carbon layer coated on the surface of aluminum foil, etc., wherein the mass content of aluminum in the aluminum foil is generally not less than 95%; the negative current collector can be copper foil.
  • the active material layer includes an active material, a binder and a conductive agent.
  • the active material is a material that participates in the electrochemical reaction during the charging and discharging process of the pole piece/electrochemical device.
  • the active material therein is a positive pole Active materials, such as positive electrode active materials that provide lithium ions, specifically include lithium positive electrode composite metal oxides (that is, lithium-containing inorganic materials), such as lithium cobaltate (LiCoO 2 ), lithium nickelate (LiNiO 2 ), manganic acid At least one of lithium (LiMn 2 O 4 ), lithium iron phosphate (LiFePO 4 ), and a ternary material.
  • the active material therein is a negative pole active material
  • the negative pole active material can include artificial graphite, natural graphite, soft carbon, hard carbon, mesocarbon microspheres (MCMB), silicon, silicon-carbon composite At least one of silicon oxide, lithium titanate, and lithium metal.
  • the binder in the active material layer and the conductive agent have the same effect as the binder and the conductive agent in the protective layer.
  • the selection of the binder and the conductive agent is as mentioned above.
  • the conductive agent and the binder in the protective layer and the active material layer The binders can be the same or different.
  • the negative electrode active material layer may further include a dispersant, and the dispersant includes sodium carboxymethylcellulose and the like.
  • the protective layer is provided on the surface of the positive electrode collector, while the negative electrode sheet is not provided with a protective layer.
  • the pole piece provided by the present application also includes a tab, and the position of the tab can be a conventional position in the field, for example, it can be set at the end or middle of the pole piece.
  • the positive pole tab can be aluminum foil; when the pole piece is a negative pole piece, the negative pole tab can be copper foil.
  • the pole piece provided by this application can be prepared by conventional methods in the field such as coating method.
  • the raw materials of the protective layer can be dispersed in a solvent, stirred evenly to prepare a protective layer slurry, and then the protective layer slurry Coated on the surface of the current collector and dried to form a protective layer; disperse the raw materials of the active material layer in a solvent, stir evenly to prepare the active material layer slurry, and then apply the active material layer slurry on the protective layer away from the The surface of the current collector or the area where the protective layer is not provided on the surface of the current collector is dried and rolled to form an active material layer, and then the tab is placed on the surface of the current collector to obtain a pole piece.
  • the pole piece provided by this application includes a protective layer, and controls the mass fraction of each component in the protective layer, the relationship between the thickness of the protective layer and the particle size of the inactive material and the thickness of the active material layer, which not only effectively solves the problem of lithium-ion batteries.
  • the electrical performance of the lithium-ion battery is basically not affected, and the problem that the safety and electrical performance of the lithium-ion battery cannot be balanced is solved.
  • the second aspect of the present application provides a lithium-ion battery, including any one of the pole pieces described above.
  • the application provides a lithium-ion battery, including the pole piece provided in the first aspect of the application.
  • the pole piece is a positive pole piece
  • conventional technical means can be used to prepare a lithium-ion battery with a conventional negative pole piece, a separator, and an electrolyte
  • the diaphragm includes one or more of polyethylene (PE), polypropylene (PP), and polyimide
  • the electrolyte includes carbonates, carboxylate solvents, lithium salts, and appropriate additives.
  • the above-mentioned positive electrode sheet, negative electrode sheet and separator are wound or stacked in order to form a battery cell, and then the battery cell is packaged with a packaging material such as aluminum-plastic film and injected with electrolyte, and the lithium-ion battery is prepared after charging and discharging.
  • the lithium ion battery provided by the application has better safety and electrical properties.
  • the pole piece provided in this embodiment is a positive pole piece, including a current collector aluminum foil, a protective layer located on the surface of the current collector, and a positive electrode active material layer located on the protective layer away from the surface of the current collector, wherein:
  • the protective layer includes 62 parts by mass of aluminum oxide, 30 parts by mass of acrylic modified PVDF and 8 parts by mass of carbon black;
  • the thickness of the protective layer is 2 ⁇ m
  • the D10 of alumina is 0.2 ⁇ m, the D50 is 0.5 ⁇ m, and the D90 is 2 ⁇ m;
  • the positive electrode active material layer includes 96 parts by mass of positive electrode active material LCO, 2 parts by mass of binder PVDF and 2 parts by mass of conductive agent carbon black;
  • the thickness of the positive electrode active material layer was 40 ⁇ m.
  • the preparation method of the pole piece provided in this embodiment includes: mixing alumina, acrylic acid-modified PVDF and carbon black according to the above mass fractions, dispersing in the solvent NMP and stirring uniformly to prepare a protective layer slurry, coating the protective layer slurry On the surface of the aluminum foil, dry to obtain a protective layer; mix LCO, PVDF and carbon black according to the above mass fractions, disperse them in the solvent NMP and stir evenly to prepare a positive electrode active material layer slurry, and coat the positive electrode active material layer slurry on the protective layer.
  • the layer is far away from the surface of the current collector, and dried to obtain the positive electrode active material layer; the tab is welded on the surface of the current collector to obtain the positive electrode sheet;
  • the pole piece provided in this example can refer to Example 1, the difference is that the protective layer includes 70 parts by mass of alumina, 25 parts by mass of acrylic-modified PVDF and 5 parts by mass of carbon black.
  • the protective layer includes 80 parts by mass of alumina, 15 parts by mass of acrylic-modified PVDF, and 5 parts by mass of carbon black.
  • the protective layer includes 90 parts by mass of alumina, 8 parts by mass of acrylic-modified PVDF, and 2 parts by mass of carbon black.
  • the pole piece provided in this example can refer to Example 1, the difference is that the protective layer includes 96 parts by mass of alumina, 3.9 parts by mass of acrylic-modified PVDF and 0.1 part by mass of carbon black.
  • the pole piece provided in this embodiment can refer to Embodiment 1, the difference is:
  • the D10 of alumina is 0.1 ⁇ m, the D50 is 0.5 ⁇ m, and the D90 is 2.3 ⁇ m;
  • the thickness of the protective layer was 4 ⁇ m.
  • the pole piece provided in this embodiment can refer to Embodiment 6, the difference is:
  • the D10 of alumina is 0.2 ⁇ m, the D50 is 1 ⁇ m, and the D90 is 3 ⁇ m.
  • the pole piece provided in this embodiment can refer to Embodiment 6, the difference is:
  • the D10 of alumina is 0.5 ⁇ m, the D50 is 2 ⁇ m, and the D90 is 4 ⁇ m.
  • the pole piece provided in this embodiment can refer to Embodiment 1, the difference is:
  • the thickness of the protective layer is 4 ⁇ m.
  • the pole piece provided in this embodiment can refer to Embodiment 1, the difference is:
  • the thickness of the protective layer is 8 ⁇ m.
  • the pole piece provided in this comparative example can refer to Example 1, the difference is that the protective layer includes 50 parts by mass of alumina, 45 parts by mass of acrylic-modified PVDF and 5 parts by mass of carbon black.
  • the pole piece provided in this comparative example can refer to Example 1, the difference is that the protective layer includes 62 parts by mass of alumina, 20 parts by mass of acrylic-modified PVDF and 18 parts by mass of carbon black.
  • the pole piece provided in this comparative example can refer to Example 1, the difference is that the protective layer includes 92 parts by mass of alumina, 2 parts by mass of acrylic-modified PVDF and 6 parts by mass of carbon black.
  • the pole piece provided in this comparative example may refer to Example 1, except that the protective layer includes 92 parts by mass of aluminum oxide and 8 parts by mass of acrylic-modified PVDF.
  • the pole piece provided in this comparative example does not include a protective layer.
  • pole piece that this comparative example provides can refer to embodiment 6, difference is:
  • the D10 of alumina is 0.8 ⁇ m, the D50 is 3 ⁇ m, and the D90 is 5 ⁇ m.
  • pole piece that this comparative example provides can refer to embodiment 6, difference is:
  • the D10 of alumina is 0.4 ⁇ m, the D50 is 2 ⁇ m, and the D90 is 6 ⁇ m.
  • pole piece that this comparative example provides can refer to embodiment 1, difference is:
  • the thickness of the protective layer is 10 ⁇ m.
  • pole piece that this comparative example provides can refer to embodiment 1, difference is:
  • the D10 of alumina is 0.5 ⁇ m, the D50 is 2 ⁇ m, and the D90 is 7 ⁇ m.
  • the positive electrode sheet provided in Examples 1-10 and Comparative Example 1-9 is matched with the negative electrode sheet and the separator to prepare a bare battery cell, and the bare battery cell is packaged with an aluminum-plastic film, and a certain amount of electrolyte is injected and sealed, and the chemical synthesis is prepared.
  • Lithium-ion battery energy density ED E/V, where E is the discharge energy of the battery.
  • the test method is to fully charge the battery and then discharge it at 0.2C to 3.0V.
  • the discharged energy is E.
  • V is the system of the battery, which is obtained by measuring the length, width and height.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention concerne une pièce polaire et une batterie au lithium-ion. Dans un premier temps, l'application fournit une pièce polaire, comprenant un substrat. Le substrat comprend un collecteur de courant et une couche de protection disposée sur la surface du collecteur de courant. Une couche de substance active est en outre disposée sur la couche de protection. La couche de protection comprend, en pourcentage en masse, 62 % à 96 % d'un matériau non actif, 0,1 % à 8 % d'un agent conducteur, et 3 % à 30 % d'un liant. L'épaisseur H1 de la couche de protection et le D50 du matériau inactif satisfont la relation H1 ≥ 2 * D50. L'épaisseur H1 de la couche de protection et le D90 du matériau inactif satisfont la relation H1 ≥ D90. L'épaisseur H1 de la couche de protection et l'épaisseur H2 de la couche de substance active satisfont la relation H1/H2 ≤ 1/5. La pièce polaire selon la présente invention peut résoudre le problème selon lequel la sécurité et les performances électriques d'une batterie au lithium-ion ne peuvent pas être toutes deux garanties.
PCT/CN2022/132059 2021-11-29 2022-11-15 Pièce polaire et batterie au lithium-ion WO2023093576A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202111446122.X 2021-11-29
CN202111446122.XA CN114156434A (zh) 2021-11-29 2021-11-29 一种极片和锂离子电池

Publications (1)

Publication Number Publication Date
WO2023093576A1 true WO2023093576A1 (fr) 2023-06-01

Family

ID=80455194

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/132059 WO2023093576A1 (fr) 2021-11-29 2022-11-15 Pièce polaire et batterie au lithium-ion

Country Status (2)

Country Link
CN (1) CN114156434A (fr)
WO (1) WO2023093576A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114156434A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 一种极片和锂离子电池
CN116802851A (zh) * 2022-03-31 2023-09-22 宁德新能源科技有限公司 电化学装置和电子装置
CN117936693A (zh) * 2022-10-26 2024-04-26 珠海冠宇电池股份有限公司 一种电极组件和电池
CN116111037B (zh) * 2023-04-07 2023-08-22 宁德新能源科技有限公司 电化学装置和电子装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106784617A (zh) * 2016-12-15 2017-05-31 宁德时代新能源科技股份有限公司 一种锂离子电池正极极片，其制备方法及使用该极片的电池
CN111900392A (zh) * 2020-06-22 2020-11-06 珠海冠宇电池股份有限公司 一种正极片及含有该正极片的锂离子电池
CN114122404A (zh) * 2021-11-29 2022-03-01 珠海冠宇电池股份有限公司 极片及电化学装置
CN114156479A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 极片及电化学装置
CN114156434A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 一种极片和锂离子电池
CN114156487A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 一种极片和锂离子电池
CN114156429A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 一种极片和锂离子电池
CN114156450A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 极片及电化学装置
CN114156430A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 极片及电化学装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013073924A (ja) * 2011-09-29 2013-04-22 Panasonic Corp リチウムイオン二次電池用負極及びそれを用いたリチウムイオン二次電池
JP6602130B2 (ja) * 2014-12-26 2019-11-06 パナソニック株式会社 非水電解質二次電池用正極及び非水電解質二次電池
CN110431692B (zh) * 2017-03-31 2022-10-04 松下知识产权经营株式会社 二次电池
CN109755463B (zh) * 2017-11-08 2020-12-29 宁德时代新能源科技股份有限公司 一种电极极片、电化学装置及安全涂层
CN109755670B (zh) * 2017-11-08 2020-11-17 宁德时代新能源科技股份有限公司 一种电极极片、电化学装置及安全涂层
CN111200131A (zh) * 2018-11-16 2020-05-26 宁德时代新能源科技股份有限公司 一种正极极片及电化学装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106784617A (zh) * 2016-12-15 2017-05-31 宁德时代新能源科技股份有限公司 一种锂离子电池正极极片，其制备方法及使用该极片的电池
CN111900392A (zh) * 2020-06-22 2020-11-06 珠海冠宇电池股份有限公司 一种正极片及含有该正极片的锂离子电池
CN114122404A (zh) * 2021-11-29 2022-03-01 珠海冠宇电池股份有限公司 极片及电化学装置
CN114156479A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 极片及电化学装置
CN114156434A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 一种极片和锂离子电池
CN114156487A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 一种极片和锂离子电池
CN114156429A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 一种极片和锂离子电池
CN114156450A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 极片及电化学装置
CN114156430A (zh) * 2021-11-29 2022-03-08 珠海冠宇电池股份有限公司 极片及电化学装置

Also Published As

Publication number Publication date
CN114156434A (zh) 2022-03-08

Similar Documents

Publication Publication Date Title
CN111969214B (zh) 一种异型结构的正极片及包括该正极片的锂离子电池
WO2023093576A1 (fr) Pièce polaire et batterie au lithium-ion
WO2022037092A1 (fr) Collecteur de courant, pièce polaire et batterie
WO2023093503A1 (fr) Feuille d'électrode et dispositif électrochimique
US9595745B2 (en) Nonaqueous electrolyte secondary battery
CN113410469A (zh) 一种负极极片和二次电池以及电动汽车
CN110419128B (zh) 用于锂二次电池的负极以及包括该负极的锂二次电池
US20220376265A1 (en) Positive electrode plate and lithium-ion battery
CN112820855B (zh) 极片及电池
CN114156429A (zh) 一种极片和锂离子电池
WO2022057189A1 (fr) Batterie à semi-conducteur, module de batterie, bloc-batterie, et dispositif associé
WO2023093505A1 (fr) Pièce polaire et dispositif électrochimique
CN114156487A (zh) 一种极片和锂离子电池
WO2023093506A1 (fr) Feuille d'électrode et dispositif électrochimique
JP2012182084A (ja) 非水電解質二次電池
CN114122404A (zh) 极片及电化学装置
JP2001357855A (ja) 非水電解液二次電池
CN116093247A (zh) 一种极片及锂离子电池
WO2019102900A1 (fr) Procédé de fabrication d'électrode de batterie secondaire et procédé de fabrication de batterie secondaire
CN114204038A (zh) 集流体及其应用
KR20220008907A (ko) 전고체 전지 및 그의 제조 방법
CN116154140A (zh) 电极片及电池
CN115036458B (zh) 一种锂离子电池
JP7248043B2 (ja) 全固体電池
CN212161973U (zh) 电极极片和二次电池

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22897659

Country of ref document: EP

Kind code of ref document: A1