WO2022168835A1 - 電気化学セル - Google Patents

電気化学セル Download PDF

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Publication number
WO2022168835A1
WO2022168835A1 PCT/JP2022/003859 JP2022003859W WO2022168835A1 WO 2022168835 A1 WO2022168835 A1 WO 2022168835A1 JP 2022003859 W JP2022003859 W JP 2022003859W WO 2022168835 A1 WO2022168835 A1 WO 2022168835A1
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Prior art keywords
material layer
current collector
electrode
negative electrode
electrochemical cell
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PCT/JP2022/003859
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English (en)
French (fr)
Japanese (ja)
Inventor
順次 荒浪
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Kyocera Corp
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Kyocera Corp
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Priority to US18/263,713 priority Critical patent/US20240128442A1/en
Priority to EP22749707.0A priority patent/EP4290600A4/en
Priority to CN202280012832.8A priority patent/CN116848684A/zh
Priority to JP2022579554A priority patent/JPWO2022168835A1/ja
Publication of WO2022168835A1 publication Critical patent/WO2022168835A1/ja
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • 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
    • 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
    • H01M4/134—Electrodes based on metals, Si or alloys
    • 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
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/386—Silicon or alloys based on silicon
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
    • 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
    • H01M4/36—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
    • 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
    • H01M4/621—Binders
    • 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
    • H01M4/621—Binders
    • H01M4/622—Binders being polymers
    • 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
    • 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
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • 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 present disclosure relates to electrochemical cells.
  • Patent Document 1 An example of conventional technology is described in Patent Document 1.
  • the electrochemical cell of the present disclosure comprises a first electrode comprising a first current collector and a first electrode active material layer; a second electrode comprising a second current collector and a second electrode active material layer; a separator positioned between the first electrode and the second electrode; a package containing the first electrode, the second electrode and the separator; a first terminal electrically connected to the first current collector and extending to the outside of the package; a second terminal electrically connected to the second current collector and extending to the outside of the package;
  • the first electrode active material layer is a first region having a silicon layer located on the surface of the first current collector and a first carbon-based material layer located on the surface of the silicon layer; a second region located on the surface of the first current collector and having a second carbonaceous material layer continuous with the first carbonaceous material layer.
  • FIG. 1 is an external view of an electrochemical cell
  • FIG. FIG. 2 is a sectional view taken along the section line II-II in FIG. 1
  • 4 is an enlarged cross-sectional view of the vicinity of the negative electrode
  • FIG. FIG. 3 is a plan view showing an example of a negative electrode active material layer
  • FIG. 4 is a plan view showing another example of a negative electrode active material layer
  • FIG. 4 is a plan view showing another example of a negative electrode active material layer;
  • secondary batteries which are used repeatedly by charging and discharging, are used as power sources in various products such as home appliances, information processing equipment, and electric vehicles.
  • a lithium-ion battery using a lithium-based compound as an electrolyte has characteristics such as high output (high voltage), high energy density, and ability to be miniaturized.
  • the multilayer electrode described in Patent Document 1 includes two or more electrode active material layers on one or both sides of a current collector, and the layer closer to the current collector contains a large amount of carbon-based material and binder. , the layer on the far side from the current collector has a large content of the silicon-based material.
  • the purpose of the present disclosure is to provide an electrochemical cell that can be further miniaturized.
  • FIG. 1 is an external view of an electrochemical cell.
  • FIG. 2 is a cross-sectional view taken along section line II--II in FIG.
  • FIG. 3 is an enlarged cross-sectional view of the vicinity of the negative electrode.
  • Electrochemical cell 100 is, for example, a semi-solid lithium ion battery.
  • the electrochemical cell 100 includes a power generating element 102, a package 103, and terminals 104.
  • the electrochemical cell 100 is plate-shaped, for example.
  • the electrochemical cell 100 functions as a power source for an external device by electrically connecting it to the external device.
  • the power generation element 102 is a member for storing and releasing electricity using an electrochemical reaction.
  • the power generation element 102 includes, for example, a negative electrode 102a as a first electrode, a positive electrode 102b as a second electrode, and a separator 102c between the negative electrode 102a and the positive electrode 102b.
  • the power generating element 102 allows cations or anions to permeate between the negative electrode 102a and the positive electrode 102b through the separator 102c.
  • the power generation element 102 is, for example, a laminate of a negative electrode 102a, a separator 102c, and a positive electrode 102b.
  • the power generation element 102 is, for example, plate-shaped.
  • a negative electrode 102a, a separator 102c, and a positive electrode 102b are laminated in the plate-like thickness direction.
  • the negative electrode 102a and the positive electrode 102b contain, for example, an electrochemically active substance.
  • the negative electrode 102a and the positive electrode 102b may contain an electrolyte, for example.
  • an electrolyte for example, a solvent or a mixture of solvents to which a salt is added can be used.
  • the negative electrode 102 a includes a negative electrode current collector 10 and a negative electrode active material layer 11 .
  • the negative electrode current collector 10, which is the first current collector is, for example, plate-shaped, sheet-shaped, or foil-shaped, and includes a conductive material.
  • the negative electrode active material layer 11, which is the first electrode active material layer, is provided on one surface or both surfaces of the negative electrode current collector 10 in a layered manner.
  • the negative electrode active material layer 11 may contain a negative electrode active material and an electrolyte.
  • the negative electrode current collector 10 includes, for example, a metal material containing aluminum, copper, lithium, nickel, stainless steel, tantalum, titanium, tungsten, vanadium, or alloys thereof.
  • the negative electrode current collector 10 may contain nonmetallic materials such as metal oxides (eg, TiN, TiB 2 , MoSi 2 , n-BaTiO 3 , Ti 2 O 3 , ReO 3 , RuO 2 , IrO 2 , etc.).
  • the negative electrode current collector 10 has a thickness of, for example, 5 to 15 ⁇ m.
  • the outer dimensions of the negative electrode current collector 10 are substantially the same as the outer dimensions of the negative electrode 102 a , and can be appropriately set according to the dimensions of the electrochemical cell 100 .
  • the negative electrode active material layer 11 includes a first region 11a having a silicon layer 12 located on the surface of the negative electrode current collector 10 and a first carbon-based material layer 13 located on the surface of the silicon layer 12; and a second region 11 b having a second carbon-based material layer 14 located on the surface and contiguous with the first carbon-based material layer 13 .
  • the silicon layer 12 of the first region 11 a is directly provided on the surface of the negative electrode current collector 10 .
  • the silicon layer 12 is a thin film made of a silicon material including, for example, pure silicon (Si), silicon oxide (SiOx (0 ⁇ x ⁇ 2)), a silicon alloy, or the like.
  • the silicon layer 12 may be a crystalline silicon thin film or an amorphous silicon thin film. If the thin film is amorphous silicon, the silicon layer 12 is easily deformed, and the possibility of cracking of the silicon layer 12 even if the negative electrode current collector 10 is deformed can be reduced.
  • the first carbonaceous material layer 13 in the first region 11a is provided directly on the surface of the silicon layer 12.
  • the first carbon-based material layer 13 includes a carbon-based material and an electrolyte.
  • the first carbonaceous material layer 13 can be formed, for example, by mixing an electrolyte and a carbonaceous material to form a paste, and applying the mixture to the surface of the silicon layer 12 .
  • Carbon-based materials include, for example, graphite, hard carbon, soft carbon, carbon nanotubes, graphene, and the like.
  • the form of the carbon-based material may be, for example, particulate, short fiber, scaly, or the like, and graphite particles, scaly graphene, or the like can be used.
  • Electrolytes include non-aqueous electrolytes such as lithium salts (for lithium ion batteries) or sodium salts (for sodium ion batteries) in solvents.
  • Lithium salts include, for example, LiPF6 , LiBF4 , and LiClO4 .
  • Sodium salts include, for example, NaClO 4 , NaPF 6 and sodium bis(trifluoromethanesulfonimide) (Na-TFSI).
  • Solvents include, for example, propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), dimethoxyethane (DME), diethyl carbonate (DEC), tetrahydrofuran (THF), and triethylene glycol dimethyl ether.
  • the second carbonaceous material layer 14 in the second region 11b is provided directly on the surface of the negative electrode current collector 10.
  • the second carbon-based material layer 14 includes a carbon-based material and an electrolyte.
  • the second carbonaceous material layer 14 can be formed, for example, by mixing an electrolyte and a carbonaceous material to form a paste, and applying the mixture to the surface of the negative electrode current collector 10 .
  • Both the carbon-based material and the electrolyte of the second carbon-based material layer 14 can use the same materials as those of the first carbon-based material layer 13 .
  • the first carbon-based material layer 13 and the second carbon-based material layer 14 may optionally contain an additive material such as silicon, silicon oxide, or polyimide as a binder in addition to the electrolyte and the carbon-based material. good.
  • an additive material such as silicon, silicon oxide, or polyimide as a binder in addition to the electrolyte and the carbon-based material. good.
  • the first carbonaceous material layer 13 and the second carbonaceous material layer 14 do not substantially contain a binder material.
  • the negative electrode current collector 10 is a copper foil, and as the silicon layer 12, a silicon thin film is formed on the surface of the copper foil by sputtering. At this time, the silicon layer 12 is not provided over the entire surface of the negative electrode current collector 10, but is provided partially. The entire surface of the negative electrode current collector 10 may be partially exposed without being covered with the silicon layer 12 .
  • a paste obtained by mixing an electrolyte and a carbon-based material is applied to the entire surface of the negative electrode current collector 10 provided with the silicon layer 12 .
  • the paste applied to the portion with the silicon layer 12 becomes the first carbonaceous material layer 13
  • the paste applied to the portion without the silicon layer 12 becomes the second carbonaceous material layer 14 . Since the first carbon-based material layer 13 and the second carbon-based material layer 14 are formed by applying the same paste, they can be formed so as to be connected to each other.
  • the thickness of the first region 11a and the thickness of the second region 11b may be the same or different.
  • the silicon layer 12 in the first region 11a has a thickness of, for example, 0.5 to 15 ⁇ m
  • the first carbon-based material layer 13 in the first region 11a has a thickness of, for example, 0.5 to 349.5 ⁇ m.
  • the second carbonaceous material layer 14 in the second region 11b has a thickness of, for example, 15.5 to 350 ⁇ m.
  • the negative electrode active material layer 11 only needs to include the first region 11a and the second region 11b.
  • the energy density of the electrochemical cell 100 can be increased by providing the silicon layer 12 directly on the surface of the negative electrode current collector 10 in the first region 11a.
  • the second carbon-based material layer 14 is provided directly on the surface of the negative electrode current collector 10, and the second carbon-based material layer 14 and the first carbon-based material layer 13 are provided so as to be continuous. Therefore, an increase in the electrical resistance of the negative electrode 102a can be suppressed.
  • the energy density can be increased by the silicon layer 12 while suppressing an increase in the electrical resistance value, and the electrochemical cell 100 can be miniaturized.
  • the positive electrode 102b includes a positive electrode current collector 20 and a positive electrode active material layer 21.
  • the positive electrode current collector 20, which is the second current collector is, for example, plate-shaped, sheet-shaped, or foil-shaped, and includes a conductive material.
  • the positive electrode active material layer 21, which is the second electrode active material layer is provided on one surface or both surfaces of the positive electrode current collector 20 in a layered manner.
  • the positive electrode active material layer 21 may contain a positive electrode active material and an electrolyte.
  • Positive electrode active materials include, for example, nickel-cobalt-aluminum-based lithium composite oxide (NCA), spinel-based lithium manganate (LMO), lithium iron phosphate (LFP), lithium cobaltate (LCO), and nickel-cobalt-manganese-based lithium composite oxide. (NCM).
  • NCA nickel-cobalt-aluminum-based lithium composite oxide
  • LMO spinel-based lithium manganate
  • LFP lithium iron phosphate
  • LCO lithium cobaltate
  • Cathode 102b may comprise solid compounds known to those skilled in the art, such as those used in nickel-metal hydride batteries, nickel-cadmium batteries, and the like.
  • the positive electrode 102b may contain, for example, LiCoO 2 or LiNiO 2 doped with Mg.
  • the electrolyte may be the same electrolyte as the anode active material layer 11 described above.
  • the positive electrode active material layer 21 can be formed, for example, by mixing an electrolyte and a positive electrode active material to form a paste, and applying the mixture to the surface of the positive electrode current collector 20 .
  • the positive electrode current collector 20 has a thickness of, for example, 5 to 30 ⁇ m, and the positive electrode active material layer 21 has a thickness of, for example, 100 to 450 ⁇ m.
  • the separator 102c allows cations or anions to pass between the negative electrode 102a and the positive electrode 102b.
  • the first carbonaceous material layer 13 and the second carbonaceous material layer 14 of the negative electrode 102a are in contact with the separator 102c.
  • the positive electrode active material layer 21 of the positive electrode 102b is in contact with the separator 102c.
  • the power generation element 102 can electrically insulate the positive electrode 102b and the negative electrode 102a by having the separator 102c.
  • the power generation element 102 When the power generation element 102 is plate-shaped, it can be set to have a length of 50 to 500 mm, a width of 50 to 300 mm, and a thickness of 0.1 to 2.0 mm, for example.
  • the package 103 is a member having a space for housing the power generation element 102 inside the package.
  • a packaging body 103 is provided to protect the power generation element 102 from the external environment. More specifically, wrapper 103 is provided to electrically insulate power generating element 102 from the external environment.
  • the package 103 is provided so as to cover the entire power generating element 102 .
  • the packaging body 103 has, for example, a flat bag shape.
  • the package 103 is formed, for example, by forming a laminate film into a flat bag shape.
  • the package 103 may be formed by welding two laminated films, for example.
  • the packaging body 103 may have, for example, a rectangular shape when viewed from the stacking direction of the negative electrode 102a, the separator 102c, and the positive electrode 102b.
  • the package 103 has an insulating material, for example. As a result, the package 103 can protect the power generation element 102 from the external environment without causing a short circuit between the power generation element 102 and the external environment through the package 103 .
  • the package 103 has, for example, a resin material. More specifically, polyethylene terephthalate or polyethylene, for example, can be used as the resin material.
  • the package 103 may have a multilayer structure, for example.
  • the package 103 includes, for example, a heat-adhesive resin material and a heat-resistant resin material.
  • a heat-adhesive resin material is specifically a resin material having a melting temperature lower than 150°C.
  • the heat-resistant resin material is specifically a resin material having a melting temperature of 150° C. or more and 300° C. or less.
  • polyethylene terephthalate or polyethylene naphthalate can be used as the heat-resistant resin material.
  • polyethylene or polypropylene can be used as the heat-adhesive resin material.
  • the terminal 104 is provided for electrically connecting the power generation element 102 and an external device.
  • the terminal 104 is, for example, plate-shaped or strip-shaped. Specifically, the terminal 104 has, for example, a rectangular shape when viewed from the stacking direction of the power generating elements 102 .
  • Terminals 104 may be rectangular, for example.
  • Terminal 104 includes a negative terminal 104a and a positive terminal 104b. Negative electrode terminal 104 a is electrically connected to negative electrode current collector 10 and extends to the outside of package 103 .
  • the positive terminal 104 b is electrically connected to the positive current collector 20 and extends to the outside of the package 103 .
  • terminals 104 When viewed from the stacking direction of the power generating elements 102 , the terminals 104 are positioned on either side of the outer periphery of the power generating elements 102 . Terminals 104 are electrically connected to external connection terminals outside package 103 .
  • the terminal 104 is made of, for example, a conductive member.
  • Terminal 104 may comprise, for example, a metallic material. More specifically, aluminum or copper, for example, can be used as the metal material.
  • the terminal 104 has a plate shape, it can be set to have a length of 30 to 100 mm, a width of 10 to 100 mm, and a thickness of 0.1 to 0.5 mm, for example.
  • FIG. 4 is a plan view showing an example of a negative electrode active material layer.
  • the negative electrode active material layer 11 for example, strip-shaped first regions 11a and strip-shaped second regions 11b are alternately arranged in plan view.
  • strip-shaped silicon layers 12 are provided on the surface of the negative electrode current collector 10 at regular intervals, and the surface of the negative electrode current collector 10 is exposed in strips.
  • a first carbon-based material layer 13 is further provided on the strip-shaped silicon layer 12
  • a second carbon-based material layer 14 is provided on the exposed strip-shaped surface of the negative electrode current collector 10 . Adjacent first carbon-based material layer 13 and second carbon-based material layer 14 are connected to each other.
  • the width of the strip-shaped first region 11a and the width of the strip-shaped second region 11b may be the same or different.
  • the width of the strip-shaped first regions 11a and the width of the strip-shaped second regions 11b are made the same, and the number of the strip-shaped first regions 11a and the number of the strip-shaped second regions 11b are made the same.
  • FIG. 5 is a plan view showing another example of the negative electrode active material layer.
  • the second region 11b is surrounded by the first region 11a in plan view.
  • a silicon layer 12 having a plurality of through holes is provided on the surface of the negative electrode current collector 10, and the surface of the negative electrode current collector 10 is exposed through the through holes.
  • a first carbon-based material layer 13 is further provided on the silicon layer 12
  • a second carbon-based material layer 14 is provided on the exposed surface of the negative electrode current collector 10 .
  • the second region 11b is surrounded by the first region 11a, and the first carbon-based material layer 13 and the second carbon-based material layer 14 are connected to each other.
  • the shape of the second region 11b in plan view that is, the shape of the through hole is circular, but the shape is not limited.
  • the shape of the second region 11b in a plan view may be a polygonal shape such as a triangular shape or a square shape, an elliptical shape, an elongated hole shape, or the like, or an irregular shape.
  • the area S1 occupied by the first region 11a can be made larger than the area S2 occupied by the second region 11b (S1>S2).
  • FIG. 6 is a plan view showing another example of the negative electrode active material layer.
  • the negative electrode active material layer 11 has a first region 11a surrounded by a second region 11b in plan view.
  • a plurality of island-shaped silicon layers 12 are provided on the surface of the negative electrode current collector 10, and the surface of the negative electrode current collector 10 is exposed at other portions.
  • a first carbon-based material layer 13 is further provided on the plurality of silicon layers 12
  • a second carbon-based material layer 14 is provided on the exposed surface of the negative electrode current collector 10 .
  • the first region 11a is surrounded by the second region 11b, and the first carbon-based material layer 13 and the second carbon-based material layer 14 are connected to each other.
  • the shape of the first region 11a in plan view that is, the shape of the silicon layer 12 is circular, but the shape is not limited.
  • the shape of the first region 11a in plan view may be a polygonal shape such as a triangle or a square, an ellipse, an elongated hole, or an irregular shape.
  • the area S1 occupied by the first region 11a can be made smaller than the area S2 occupied by the second region 11b (S1 ⁇ S2).
  • the structure of the negative electrode consists of a copper foil negative electrode current collector, an amorphous silicon layer provided in a strip shape on the surface of the negative electrode current collector as shown in FIG.
  • An electrochemical cell having a negative electrode active material layer containing a negative electrode active material in which 1 weight percent of conductive carbon powder is mixed with graphite powder and an electrolyte was used as an example.
  • Comparative Example 1 was an electrochemical cell of a conventional configuration having a negative electrode current collector and a negative electrode active material layer containing a negative electrode active material and an electrolyte.
  • the structure of the negative electrode is composed of a copper foil negative electrode current collector, an amorphous silicon layer provided on the entire surface of the negative electrode current collector, and 1% by weight of conductive carbon powder in graphite powder provided on the surface of the amorphous silicon layer.
  • Comparative Example 2 was an electrochemical cell having a negative electrode active material layer containing a mixed negative electrode active material and an electrolyte.
  • the positive electrode was constructed by using a graphite-coated aluminum foil as a positive electrode current collector, and using a kneaded mixture of lithium iron phosphate, carbon black, and an electrolytic solution.
  • the energy density and electrical resistance of the electrochemical cell of Example and Comparative Examples 1 and 2 were measured. ⁇ Energy density measurement The weight of the positive electrode active material, the weight of the negative electrode active material, copper foil or copper foil with amorphous silicon, aluminum foil, and separator having the same area as the positive electrode active material are measured and added together. was taken as the measurement weight. In each electrochemical cell, initial charge/discharge was performed, generated gas was degassed, and charge/discharge was repeated twice, for a total of three charge/discharge cycles. The energy density was obtained by dividing the energy at the time of the third discharge by the previously calculated measurement weight. ⁇ Measurement of electrical resistance value It was calculated by dividing the difference between the voltage when a current of 30 seconds was applied and the OCV by the applied current value.
  • Example 1 when compared with Comparative Example 1, the energy density could be increased without increasing the electrical resistance value. In comparison with Comparative Example 1, Comparative Example 2 was able to increase the energy density, but the electrical resistance value also increased.
  • the electrochemical cell of the present disclosure comprises a first electrode comprising a first current collector and a first electrode active material layer; a second electrode comprising a second current collector and a second electrode active material layer; a separator positioned between the first electrode and the second electrode; a package containing the first electrode, the second electrode and the separator; a first terminal electrically connected to the first current collector and extending to the outside of the package; a second terminal electrically connected to the second current collector and extending to the outside of the package;
  • the first electrode active material layer is a first region having a silicon layer located on the surface of the first current collector and a first carbon-based material layer located on the surface of the silicon layer; a second region located on the surface of the first current collector and having a second carbonaceous material layer continuous with the first carbonaceous material layer.
  • electrochemical cell of the present disclosure further miniaturization is possible by increasing the energy density while suppressing an increase in electrical resistance.

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