WO2023184232A1 - Dispositif électrochimique et dispositif électronique - Google Patents

Dispositif électrochimique et dispositif électronique Download PDF

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Publication number
WO2023184232A1
WO2023184232A1 PCT/CN2022/084048 CN2022084048W WO2023184232A1 WO 2023184232 A1 WO2023184232 A1 WO 2023184232A1 CN 2022084048 W CN2022084048 W CN 2022084048W WO 2023184232 A1 WO2023184232 A1 WO 2023184232A1
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Prior art keywords
protective layer
electrochemical device
active material
positive electrode
mass
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PCT/CN2022/084048
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English (en)
Chinese (zh)
Inventor
刘晓欠
韩冬冬
王可飞
Original Assignee
宁德新能源科技有限公司
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Application filed by 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to CN202280010584.3A priority Critical patent/CN116783725A/zh
Priority to PCT/CN2022/084048 priority patent/WO2023184232A1/fr
Publication of WO2023184232A1 publication Critical patent/WO2023184232A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-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
    • H01M4/13—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
    • 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
    • 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 energy storage, and specifically to an electrochemical device and an electronic device.
  • the present application provides an electrochemical device, which includes: a positive electrode, the positive electrode includes a positive electrode current collector, a protective layer and a positive electrode active material layer, the protective layer is disposed between the positive electrode current collector and the positive electrode active material layer between the positive active material layers; wherein the protective layer includes a first insulating material, the first insulating material includes A element, and the A element includes Al, Si, Mg, Ca, Ti, Ce, Zn, Y , Hf, Zr, Ba, or Sn at least one.
  • the risk of a short circuit between the positive electrode current collector and the negative electrode active material layer can be reduced when the electrochemical device is impacted or punctured by external forces, thereby improving the performance of the electrochemical device.
  • Safety performance By providing a protective layer between the positive electrode current collector and the positive electrode active material layer, the risk of a short circuit between the positive electrode current collector and the negative electrode active material layer can be reduced when the electrochemical device is impacted or punctured by external forces, thereby improving the performance of the electrochemical device. Safety performance.
  • the protective layer further includes a first active material, the first active material includes Li element and M element, and the M element includes at least one of Mn or Fe.
  • the mass percentage of the A element is a%, and the mass percentage of the M element is m%, satisfying: 0.3 ⁇ m/a ⁇ 170.
  • the electrochemical device has an internal resistance of 20 m ⁇ to 55 m ⁇ at a 50% state of charge.
  • the infrared spectrum of the protective layer has a characteristic peak in the range of 1400 cm-1 to 1700 cm-1 or 2100 cm-1 to 2300 cm-1.
  • the protective layer includes a first adhesive that includes a polymer formed from at least one of acrylic acid, acrylate, acrylate, or acrylonitrile.
  • the mass percentage of the first binder is 1% to 20% based on the mass of the protective layer.
  • the first adhesive is an aqueous adhesive.
  • the first insulating material includes aluminum oxide, magnesium oxide, titanium oxide, hafnium dioxide, tin oxide, ceria, zinc oxide, calcium oxide, zirconium oxide, yttrium oxide, boehmite, hydrogen At least one of aluminum oxide, magnesium hydroxide, calcium hydroxide, calcium silicate, diaspore, barium sulfate, calcium sulfate or calcium silicate.
  • the mass percentage of the first insulating material is 0.5% to 99%.
  • the first active material includes at least one of lithium iron phosphate, lithium iron manganese phosphate, or lithium manganate.
  • the protective layer further includes a leveling agent.
  • the leveling agent includes at least one of a silicone compound, a silicone derivative, an oxygen-containing olefin polymer, an acrylate polymer, an acrylate polymer, or a fluorocarbon compound. kind.
  • the mass percentage of the leveling agent is 0.001% to 6% based on the mass of the protective layer.
  • the thickness of the protective layer is H1 ⁇ m, 0.5 ⁇ H1 ⁇ 10.
  • the thickness of the cathode active material layer is H2 ⁇ m, 20 ⁇ H2 ⁇ 90.
  • the protective layer further includes a first conductive agent.
  • the first conductive agent includes at least one of graphene, graphite fiber, carbon nanotube, Ketjen black or conductive carbon.
  • the mass percentage of the first conductive agent is 0.1% to 20%.
  • the positive active material layer includes a second active material, a second binder, and a second conductive agent.
  • the mass percentage of the second active material is 95% to 98% based on the mass of the cathode active material layer.
  • the second adhesive includes at least one of polyvinylidene fluoride, nitrile rubber, or polyacrylate.
  • the mass percentage of the second binder is 1.0% to 3.0% based on the mass of the cathode active material layer.
  • the second conductive agent includes at least one of graphene, graphite fiber, carbon nanotube, Ketjen black or conductive carbon. In some embodiments, the mass percentage of the second conductive agent is 1.0% to 2.0% based on the mass of the cathode active material layer.
  • the present application relates to an electronic device comprising an electrochemical device according to any of the preceding embodiments.
  • a list of items connected by the term "at least one of,” “at least one of,” “at least one of,” or other similar terms may mean that the listed items any combination of.
  • the phrase “at least one of A and B” means only A; only B; or A and B.
  • the phrase “at least one of A, B, and C” means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B and C.
  • Project A can contain a single component or multiple components.
  • Project B can contain a single component or multiple components.
  • Project C may contain a single component or multiple components.
  • the present application provides an electrochemical device, which includes: a positive electrode including a positive current collector, a protective layer and a positive active material layer.
  • the protective layer is disposed between the cathode current collector and the cathode active material layer.
  • the protective layer includes a first insulating material, the first insulating material includes A element, and the A element includes Al, Si, Mg, Ca, Ti, Ce, Zn, Y, Hf, Zr, Ba, or At least one of Sn.
  • the risk of a short circuit between the positive electrode current collector and the negative electrode active material layer can be reduced when the electrochemical device is impacted or punctured by external forces, thereby improving the performance of the electrochemical device.
  • Safety performance By providing a protective layer between the positive electrode current collector and the positive electrode active material layer, the risk of a short circuit between the positive electrode current collector and the negative electrode active material layer can be reduced when the electrochemical device is impacted or punctured by external forces, thereby improving the performance of the electrochemical device. Safety performance.
  • the first insulating material includes aluminum oxide, magnesium oxide, titanium oxide, hafnium dioxide, tin oxide, ceria, zinc oxide, calcium oxide, zirconium oxide, yttrium oxide, boehmite, aluminum hydroxide , at least one of magnesium hydroxide, calcium hydroxide, calcium silicate, diaspore, barium sulfate, calcium sulfate or calcium silicate.
  • the protective layer further includes a first active material, the first active material includes Li element and M element, and the M element includes at least one of Mn or Fe.
  • the first active material includes at least one of lithium iron phosphate, lithium iron manganese phosphate, or lithium manganate.
  • Mn is derived from at least one of lithium iron manganese phosphate (LFMP) or lithium manganate (LMO).
  • Fe is derived from at least one of lithium iron phosphate (LFP) or lithium iron manganese phosphate (LFMP).
  • the first active material has a greater resistance after being fully charged, thereby further improving the safety performance of the electrochemical device.
  • it has electrochemical activity itself, which not only improves the safety performance of the electrochemical device, but also improves the internal resistance of the electrochemical device, allowing the electrochemical device to have better rate performance.
  • the mass percentage of the A element is a%, and the mass percentage of the M element is m%, where 0 ⁇ m/a ⁇ 170 is satisfied. In some embodiments, 0.3 ⁇ m/a ⁇ 170. In some embodiments, 0.3 ⁇ m/a ⁇ 15.
  • 0.26% ⁇ a ⁇ 52.5%, and/or m ⁇ 34.5% In some embodiments, 0.26% ⁇ a ⁇ 52.5%, and/or m ⁇ 34.5%.
  • the electrochemical device has an internal resistance of 20 m ⁇ to 55 m ⁇ at a 50% state of charge. In some embodiments, the internal resistance of the electrochemical device at 50% state of charge is 20m ⁇ , 22m ⁇ , 25m ⁇ , 30m ⁇ , 40m ⁇ , 50m ⁇ , or a range between any two of the aforementioned values.
  • the mass percentage of the first insulating material is 9% to 98% based on the mass of the protective layer. In some embodiments, the mass percentage of the first insulating material is 9%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72% , 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 95%, 98% or the range between any two of the aforementioned values.
  • the mass percentage of the first active material is 1% to 95%. In some embodiments, based on the mass of the protective layer, the mass percentage of the first active material is 20% to 70%. In some embodiments, the mass percentage of the first active material is 0.8%, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or the range between any two of the aforementioned values.
  • the protective layer includes a first adhesive.
  • the infrared spectrum of the protective layer has a characteristic peak in the range of 1400 cm-1 to 1700 cm-1 or 2100 cm-1 to 2300 cm-1.
  • the first binder in the protective layer contains polar groups such as carboxyl or cyano groups, which can improve the bonding effect between the protective layer and the positive electrode current collector and reduce the risk of the electrochemical device being impacted or irritated by external forces. The risk of falling off during wear is thereby suppressed from the occurrence of short circuit between the positive electrode current collector and the negative electrode active material layer, and the safety performance of the electrochemical device is improved.
  • the first binder is a water-based binder, which can improve the bonding effect between the safety layer and the positive electrode current collector and the positive electrode active material layer, thereby improving the safety performance of the electrochemical device.
  • the first binder includes a polymer formed from at least one of acrylic acid, acrylamide, an acrylate, acrylonitrile, or an acrylate.
  • the first binder includes an acrylate and a polymer formed from at least one of acrylic acid, acrylonitrile, and acrylate. At this time, the first binder can have good stability while ensuring high bonding effect, thereby reducing the occurrence of side reactions and inhibiting the occurrence of flatulence in the electrochemical device.
  • the mass percentage of the first binder is 1% to 20% based on the mass of the protective layer. In some embodiments, the mass percentage of the first binder is 1%, 2%, 3%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8% , 8.5%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20% or the range between any two of the aforementioned values.
  • the protective layer further includes a first conductive agent.
  • the first conductive agent includes at least one of graphene, graphite fiber, carbon nanotube, Ketjen black or conductive carbon.
  • the mass percentage of the first conductive agent is 0.1% to 20% based on the mass of the protective layer. In some embodiments, the mass percentage of the first conductive agent is 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.2%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.2% , 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 10%, 12 %, 14%, 16%, 18%, 20% or the range between any two of the aforementioned values.
  • the protective layer further includes a leveling agent.
  • the leveling agent includes at least one of a silicone compound, a silicone derivative, an oxygen-containing olefin polymer, an acrylate polymer, an acrylate polymer, or a fluorocarbon compound.
  • a silicone compound for example: polysiloxane, ethoxypropylene-propoxypropylene polymer, etc.
  • the mass percentage of the leveling agent is 0.001% to 6% based on the mass of the protective layer.
  • the mass percentage of the leveling agent is 0.001%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.15%, 0.2 %, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6% or the range between any two of the aforementioned values.
  • the addition of leveling agent is conducive to forming a uniform and smooth protective layer, increasing the contact area between the protective layer and the current collector and the positive active material layer, thereby improving the safety of the electrochemical device.
  • the protective layer may have a thickness of H1 ⁇ m, and the positive active material layer may have a thickness of H2 ⁇ m.
  • the value of H2/H1 is or ranges between any two values mentioned above. When H2/H1 is within the above range, it can suppress the risk of the positive active material layer falling off when the electrochemical device is hit or punctured by external forces, further improving the safety performance of the electrochemical device.
  • H1 is 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, or any of the foregoing
  • the range between two values. H1 is within the above range. On the one hand, it can improve the shielding effect of the safety layer on the positive electrode current collector, thereby reducing the risk of short circuit between the positive electrode current collector and the negative electrode active material layer when the electrochemical device is impacted or squeezed by external force. On the other hand, it is possible to prevent the safety layer from being too thick, which would lead to a reduction in the energy density of the electrochemical device.
  • H2 is 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90 or a range between any two of the aforementioned values.
  • the positive active material layer includes a second active material, a second binder, and a second conductive agent.
  • the second active material includes lithium cobalt oxide (abbreviated as LCO).
  • the mass percentage of the second active material is 94% to 99% based on the mass of the cathode active material layer. In some embodiments, based on the mass of the cathode active material layer, the mass percentage of the second active material is 94%, 94.5%, 95%, 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5 %, 99% or the range between any two of the aforementioned values.
  • the second adhesive includes at least one of polyvinylidene fluoride (abbreviated as PVDF), nitrile rubber, or polyacrylate.
  • the mass percentage of the second binder is 0.5% to 2.5% based on the mass of the cathode active material layer. In some embodiments, based on the mass of the cathode active material layer, the mass percentage of the second binder is 0.5%, 1%, 1.5%, 2%, 2.5% or a range between any two of the aforementioned values.
  • the second conductive agent includes at least one of graphene, graphite fibers, carbon nanotubes, Ketjen black, or conductive carbon.
  • the mass percentage of the second conductive agent is 0.5% to 3.5% based on the mass of the cathode active material layer. In some embodiments, based on the mass of the cathode active material layer, the mass percentage of the second conductive agent is 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5% or between any two of the aforementioned values. scope.
  • the present application can reduce the risk of short circuit between the positive current collector and the negative active material layer when the electrochemical device is impacted or punctured by external force, thus Improve the safety performance of electrochemical devices.
  • the present application recognizes that by controlling the material composition in the protective layer to include a first insulating material and a first active material, the protective layer can improve the safety performance of the electrochemical device while also improving the internal performance of the electrochemical device. block.
  • the electrochemical device of the present application also includes a separator, an electrolyte and a negative electrode.
  • electrochemical devices of the present application include, but are not limited to: all kinds of primary or secondary batteries.
  • the electrochemical device is a lithium secondary battery.
  • lithium secondary batteries include, but are not limited to: lithium metal secondary batteries, lithium ion secondary batteries, lithium polymer secondary batteries, or lithium ion polymer secondary batteries.
  • the preparation method of the electrochemical device of the present application is described in detail below by taking a lithium-ion battery as an example.
  • Preparation of the negative electrode Disperse the negative electrode active material (at least one of carbon material, silicon material or lithium titanate) and negative electrode binder, as well as optional conductive material, into the solvent system according to a certain mass ratio and stir thoroughly. After uniformity, it is coated on the negative electrode current collector, dried and cold pressed to obtain the negative electrode.
  • the negative electrode active material at least one of carbon material, silicon material or lithium titanate
  • the negative electrode binder as well as optional conductive material
  • First slurry a protective layer slurry
  • step (3) Drying the positive electrode current collector containing the first slurry obtained in step (2) to remove the solvent to obtain a positive electrode current collector coated with a protective layer;
  • second slurry Disperse the second active material, the second conductive agent, and the second binder in the solvent system according to a certain mass ratio, stir and mix thoroughly to obtain a slurry of the positive electrode active material (hereinafter referred to as "second slurry”). material”);
  • step (6) Dry the positive electrode current collector containing the second slurry in step (5) to remove the solvent, thereby obtaining the desired positive electrode.
  • the types of the first insulating material, the first conductive agent, the first binder, the first active material, the second active material, the second conductive agent and the second binder are as described above.
  • examples of the solvent include, but are not limited to, N-methylpyrrolidone, acetone, or water. In some embodiments, the amount of solvent can be adjusted appropriately.
  • the current collector has a thickness in the range of 3 microns to 20 microns, although the disclosure is not limited thereto.
  • the current collector is not particularly limited as long as the current collector is conductive without causing adverse chemical changes in the manufactured battery.
  • Examples of the current collector include copper, stainless steel, aluminum, nickel, titanium, or alloys such as copper-nickel alloys, but the disclosure is not limited thereto.
  • fine irregularities eg, surface roughness
  • the current collector can be used in various forms, and examples thereof include films, sheets, foils, meshes, porous structures, foams, or similar materials, but the disclosure is not limited thereto.
  • Isolation film In some embodiments, a polyethylene (abbreviated as PE) porous polymer film is used as the isolation film.
  • the material of the isolation membrane may include fiberglass, polyester, polyethylene, polypropylene, polytetrafluoroethylene or combinations thereof.
  • the pores in the isolation film have a diameter in the range of 0.01 micron to 1 micron, and the thickness of the isolation film ranges from 5 microns to 500 microns.
  • the electrolyte includes an organic solvent, a lithium salt, and additives.
  • the organic solvent includes ethylene carbonate (abbreviated as EC), propylene carbonate (abbreviated as PC), diethyl carbonate (abbreviated as DEC), ethyl methyl carbonate (abbreviated as EMC), dimethyl carbonate At least one of ester (abbreviated as DMC), propylene carbonate or ethyl propionate.
  • the lithium salt includes at least one of an organic lithium salt or an inorganic lithium salt.
  • lithium salts include lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium difluorophosphate (LiPO 2 F 2 ), lithium bistrifluoromethanesulfonimide LiN (CF 3 SO 2 ) 2 (LiTFSI), lithium bis(fluorosulfonyl)imide Li(N(SO 2 F) 2 )(LiFSI), lithium bis(fluorosulfonyl)borate LiB(C 2 O 4 ) 2 (LiBOB) or lithium difluoroxalatoborate At least one of LiBF 2 (C 2 O 4 ) (LiDFOB).
  • LiPF 6 lithium hexafluorophosphate
  • LiBF 4 lithium tetrafluoroborate
  • LiPO 2 F 2 lithium difluorophosphate
  • LiN CF 3 SO 2 ) 2
  • LiTFSI lithium bis(fluorosulfonyl)imide Li(N
  • the bare battery core obtained by winding is placed in an outer package, electrolyte is injected and packaged, and a lithium-ion battery is obtained through processes such as formation, degassing, and trimming.
  • the present application provides an electronic device comprising the electrochemical device according to the foregoing content.
  • the electronic devices include, but are not limited to: notebook computers, pen-input computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, head-mounted Stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini discs, transceivers, electronic notepads, calculators, memory cards, portable recorders, radios, backup power supplies, motors, cars, motorcycles, power-assisted bicycles , bicycles, lighting equipment, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries or lithium-ion capacitors, etc.
  • Step (1) Add the first insulating material, the first conductive agent, the first binder, and the optional first active material and/or leveling agent to deionized water and mix evenly to obtain a protective layer slurry. (hereinafter referred to as "first slurry");
  • Step (2) Coating the first slurry in step (1) on the target area of the positive electrode current collector;
  • Step (3) drying the positive electrode current collector containing the first slurry obtained in step (2) to remove the solvent to obtain a positive electrode current collector coated with a protective layer;
  • Step (4) Combine the second active material (lithium cobalt oxide, 97.3% by mass), the second conductive agent (0.6% by mass of conductive carbon (trade name: Super P)) and 0.5% by mass of carbon nanotubes (abbreviated as CNT)), the second binder (polyvinylidene fluoride (abbreviated as PVDF) with a mass percentage of 1.6%) are dispersed in the N-methylpyrrolidone solvent system and stirred thoroughly to obtain a slurry of the positive electrode active material (which will be called "second slurry");
  • Step (5) applying the second slurry to the target area of the positive electrode current collector coated with the protective layer obtained in step (3);
  • Step (6) Drying the positive electrode current collector containing the second slurry in step (5) to remove the solvent, thereby obtaining the desired positive electrode.
  • Table 1 below specifically shows the differences in protective layers in the positive electrodes in Examples 1 to 38 and Comparative Examples 1 to 3.
  • the positive electrode of the electrochemical device was fabricated as described above.
  • Negative electrode Combine the active material artificial graphite, conductive agent acetylene black, binder styrene-butadiene rubber (abbreviated as SBR), and thickener sodium carboxymethylcellulose (abbreviated as CMC) in a mass ratio of approximately 95:2:2: 1. After fully stirring and mixing in the deionized water solvent system, apply it on Cu foil, dry it, and cold-press it to obtain the negative electrode.
  • SBR binder styrene-butadiene rubber
  • CMC thickener sodium carboxymethylcellulose
  • Electrolyte In an argon atmosphere glove box with a water content of ⁇ 10 ppm, mix ethylene carbonate (abbreviated as EC), diethyl carbonate (abbreviated as DEC), and propylene carbonate (abbreviated as PC) according to 2:6: Mix evenly at a weight ratio of 2, and then dissolve the fully dried lithium salt LiPF 6 in the above solvent. The content of LiPF 6 is 12.5%. Add 1.5% 1,3-propane sultone and 3% fluoroethylene carbonate. , 2% adiponitrile. The content of each substance is based on the total weight of the electrolyte.
  • EC ethylene carbonate
  • DEC diethyl carbonate
  • PC propylene carbonate
  • Isolation film Polyethylene (abbreviated as PE) porous polymer film is used as the isolation film.
  • the positive electrode, isolation film, and negative electrode in order, so that the isolation film is between the positive and negative electrodes for isolation, roll it up, place it in the outer package, inject the prepared electrolyte and package it, and then form and degas , trimming and other processes to obtain the battery.
  • the lithium-ion battery to be tested is charged with a constant current at a rate of 0.05C to the full charge design voltage of 4.45V, and then charged with a constant voltage of the full charge design voltage of 4.45V until the current is 0.025C (cut-off current), so that the lithium-ion battery reaches full charge.
  • Charging status record the appearance of the lithium-ion battery before testing.
  • Table 2 below shows various properties of Examples 1 to 38 and Comparative Examples 1 to 3.
  • the insulating material used in the protective layer in Embodiments 1 to 38 of the present application includes at least one of boehmite, alumina, barium sulfate, calcium sulfate or calcium silicate.
  • the insulating material used in the protective layer of the present application is not limited to the types listed in the specific embodiments, and may include its analogs.
  • the first binder used for the protective layer in Examples 1 to 38 of the present application may include acrylonitrile, acrylate, acrylamide polymer, polyacrylic acid, sodium carboxymethylcellulose, sodium polyacrylate, polyacrylate, polypropylene At least one of nitrile or nitrile rubber.
  • the first adhesive used in the protective layer of the present application is not limited to the types listed in the specific embodiments. It may include a polymer formed from at least one of acrylic acid, acrylamide, acrylate, acrylonitrile or acrylate. things.
  • the first active material used in the protective layer in Embodiments 1 to 38 of the present application may include at least one of lithium iron phosphate, lithium iron manganese phosphate, or lithium manganate.
  • the first active material used in the protective layer of the present application is not limited to the types listed in the specific embodiments, and may include analogs thereof.
  • the electrochemical device of the present application can have a higher center penetration rate and can have an improved high-temperature storage internal resistance growth rate.
  • references throughout this specification to “some embodiments,” “partial embodiments,” “one embodiment,” “another example,” “example,” “specific example,” or “partial example” mean the following: At least one embodiment or example in this application includes a specific feature, structure, material or characteristic described in the embodiment or example. Accordingly, phrases such as “in some embodiments,” “in an embodiment,” “in one embodiment,” “in another example,” “in one example,” etc. may appear in various places throughout this specification. "in”, “in a particular example” or “for example” do not necessarily refer to the same embodiment or example in this application. Furthermore, the specific features, structures, materials, or characteristics herein may be combined in any suitable manner in one or more embodiments or examples.

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Abstract

La présente demande concerne un dispositif électrochimique. Ce dispositif électrochimique comprend : une électrode positive qui comprend un collecteur de courant d'électrode positive, une couche de protection et une couche de matériau actif d'électrode positive. La couche de protection est disposée entre le collecteur de courant d'électrode positive et la couche de matériau actif d'électrode positive, la couche de protection comprenant un premier matériau isolant, ce premier matériau isolant comportant un élément A, et l'élément A comprenant au moins un élément parmi Al, Si, Mg, Ca, Ti, Ce, Zn, Y, Hf, Zr, Ba ou Sn. Le dispositif électrochimique peut comporter des caractéristiques de sécurité améliorées.
PCT/CN2022/084048 2022-03-30 2022-03-30 Dispositif électrochimique et dispositif électronique WO2023184232A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280010584.3A CN116783725A (zh) 2022-03-30 2022-03-30 一种电化学装置及电子装置
PCT/CN2022/084048 WO2023184232A1 (fr) 2022-03-30 2022-03-30 Dispositif électrochimique et dispositif électronique

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