WO2023164914A1 - Dispositif électrochimique et dispositif électronique - Google Patents

Dispositif électrochimique et dispositif électronique Download PDF

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Publication number
WO2023164914A1
WO2023164914A1 PCT/CN2022/079189 CN2022079189W WO2023164914A1 WO 2023164914 A1 WO2023164914 A1 WO 2023164914A1 CN 2022079189 W CN2022079189 W CN 2022079189W WO 2023164914 A1 WO2023164914 A1 WO 2023164914A1
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WO
WIPO (PCT)
Prior art keywords
electrode assembly
negative
electrode
material layer
active material
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PCT/CN2022/079189
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English (en)
Chinese (zh)
Inventor
郝慧
刘道林
何平
Original Assignee
宁德新能源科技有限公司
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Publication date
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 CN202280010319.5A priority Critical patent/CN116830341A/zh
Priority to PCT/CN2022/079189 priority patent/WO2023164914A1/fr
Publication of WO2023164914A1 publication Critical patent/WO2023164914A1/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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of energy storage, in particular to an electrochemical device and an electronic device.
  • the method of connecting multiple lithium-ion batteries in series is generally used to increase the output voltage, but there are many problems in series connection of multiple lithium-ion batteries, such as: the wires and contact resistances used in series introduce additional electronic resistance, resulting in waste of heat and affecting battery life. ; The higher the voltage, the more lithium-ion batteries are needed, which increases the difficulty of battery management.
  • the concept of high output voltage battery was proposed, which uses the internal series connection of electrode assemblies to achieve high voltage output of a single battery, reduces the total heat production of the battery, and reduces the temperature rise during use.
  • the carbon material used as the material of the substrate layer includes at least one of carbon felt, carbon film, carbon black, acetylene black, fullerene, conductive graphite film or graphene film.
  • the present application provides an electrochemical device, which includes a casing and a first electrode assembly and a second electrode assembly disposed in the casing, the first electrode assembly and the second electrode assembly are connected in series, and satisfy the following relationship:
  • the inventors of the present application have found through research that: the capacity difference between individual electrode assemblies has an important impact on the cycle performance of the internal series high output voltage battery, by making the capacity C1 of the first electrode assembly and the capacity C2 of the second electrode assembly satisfy According to the above relationship, during the series charge and discharge process, the potential levels between the first electrode assembly and the second electrode assembly can tend to be consistent, reducing the risk of overcharging and/or overdischarging of one of the electrode assemblies, thereby inhibiting the Premature degradation of a certain electrode assembly can not only improve the cycle performance of the internal series high output voltage battery, but also reduce the expansion rate of the internal series high output voltage battery.
  • the area of the second positive electrode active material layer is Sc2, and the area of the second negative electrode active material layer is Sa2, get the second positive electrode sheet that test area is Stc2, take lithium metal as counter electrode and assemble into button type half cell, test area is
  • the first electrode assembly and the second electrode assembly form a solid electrolyte interface film in the formation stage, and the lithium content consumed in the positive electrode piece matches, which can reduce the subsequent series charging.
  • the risk of excessively high potential of the positive pole piece in a certain electrode assembly inhibits the destruction of the positive active material in the positive pole piece and the solid electrolyte interfacial film structure, thereby improving the cycle performance of the internal series high output voltage battery.
  • W1 represents the coating weight of the first negative electrode active material layer, the unit is mg/1540.25mm 2 ;
  • W2 represents the coating weight of the second negative electrode active material layer, the unit is mg/1540.25mm 2 , CB1 and CB2 are as above definition.
  • W1 represents the coating weight of the first negative electrode active material layer, the unit is mg/1540.25mm 2 ;
  • W2 represents the coating weight of the second negative electrode active material layer, the unit is mg/1540.25mm 2 ;
  • CB1 and CB2 are as above definition.
  • the value range is 0.01% to 8%, specifically, it can be 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5% or 0.25%.
  • the electrochemical device satisfies at least one of the following conditions (iii) and (iv): (iii) the value range of W1 is 100mg/1540.25mm 2 to 200mg/1540.25mm 2 ; (iv) The value range of W2 is 100mg/1540.25mm 2 to 200mg/1540.25mm 2 .
  • the first negative pole piece and the second negative pole piece are not particularly limited, as long as the purpose of the present application can be achieved.
  • the first negative electrode sheet and the second negative electrode sheet generally include a negative electrode current collector and a negative electrode active material.
  • the negative electrode current collector is not particularly limited, and any negative electrode current collector known in the art can be used, such as copper foil, aluminum foil, aluminum alloy foil, and composite current collectors.
  • the negative active material is not particularly limited, and any negative active material known in the art can be used. For example, at least one of graphite, mesocarbon microspheres, silicon, silicon carbon, silicon oxide, soft carbon, hard carbon, lithium titanate, or niobium titanate may be included.
  • a separator may include a substrate layer and a surface treatment layer.
  • the substrate layer can be a non-woven fabric, a film or a composite film with a porous structure, and the material of the substrate layer can include at least one of polyethylene, polypropylene, polyethylene terephthalate and polyimide .
  • a polypropylene porous film, a polyethylene porous film, a polypropylene non-woven fabric, a polyethylene non-woven fabric, or a polypropylene-polyethylene-polypropylene porous composite film may be used.
  • at least one surface of the substrate layer is provided with a surface treatment layer, and the surface treatment layer may be a polymer layer or an inorganic layer, or a layer formed by mixing a polymer and an inorganic material.
  • the electrochemical device further includes an electrolytic solution.
  • the electrolytic solution mentioned in this application may contain a lithium salt and a non-aqueous solvent.
  • the lithium salt is not particularly limited, and any lithium salt known in the art can be used as long as the purpose of the present application can be achieved.
  • lithium salts may include LiPF 6 , LiBF 4 , LiAsF 6 , LiClO 4 , LiB(C 6 H 5 ) 4 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiN(SO 2 CF 3 ) 2 , LiC(SO 2 At least one of CF 3 ) 3 or LiPO 2 F 2 .
  • LiPF 6 may be selected as the lithium salt.
  • the non-aqueous solvent is not particularly limited, as long as the purpose of the present application can be achieved.
  • the nonaqueous solvent may include at least one of carbonate compounds, carboxylate compounds, ether compounds, nitrile compounds, and other organic solvents.
  • the carbonate compound may include diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methylpropyl carbonate (MPC), ethylpropyl carbonate (EPC), methyl ethyl carbonate Carbonate (MEC), Ethylene Carbonate (EC), Propylene Carbonate (PC), Butylene Carbonate (BC), Vinyl Ethylene Carbonate (VEC), Fluoroethylene Carbonate (FEC), Carbonic Acid 1 ,2-Difluoroethylene carbonate, 1,1-difluoroethylene carbonate, 1,1,2-trifluoroethylene carbonate, 1,1,2,2-tetrafluoroethylene carbonate, 1 -Fluoro-2-methylethylene carbonate, 1-fluoro-1-methylethylene carbonate, 1,2-difluoro-1-methylethylene carbonate, 1,1,2-trifluoro- At least one of 2-methylethylene carbonate and trifluoromethylethylene carbonate.
  • DEC diethyl carbonate
  • DMC
  • the present application has no special limitation on the casing, as long as the purpose of the present application can be achieved.
  • the casing includes at least one of an aluminum-plastic film, an aluminum shell, a steel shell, and a plastic shell.
  • the housing can include an inner layer and an outer layer, and the inner layer is sealed and connected with the separator, so the material of the inner layer can include a polymer material to achieve a good sealing effect; at the same time, the combination of the inner layer and the outer layer can effectively protect Internal structure of an electrochemical device.
  • the thickness of the casing there is no special limitation on the thickness of the casing, as long as the purpose of this application can be achieved.
  • the casing has a thickness of 60 ⁇ m to 500 ⁇ m, preferably 60 ⁇ m to 300 ⁇ m, more preferably 60 ⁇ m to 200 ⁇ m, and the above thickness of the casing can effectively protect the internal structure of the electrochemical device.
  • the present application has no special limitation on the sealing connection method between the spacer and the housing, as long as the purpose of the present application can be achieved.
  • the sealing method includes one of hot pressing, glue sealing and welding.
  • the hot-pressing conditions are not particularly limited, as long as the purpose of this application can be achieved, for example, for the polypropylene inner layer material, the hot-pressing temperature is 150°C to 220°C, and the hot-pressing pressure is 0.1Mpa to 0.6 MPa.
  • the structure of the electrode assembly is a wound structure, and the electrode assembly includes a single tab or multiple tabs.
  • the electrode assembly includes a monopole lug, and a positive pole lug and a negative pole lug are led out from the positive pole piece and the negative pole piece respectively.
  • the electrode assembly includes multiple tabs, one positive tab and one negative tab can be drawn from each circle of positive pole pieces and negative pole pieces, or two or more circles of positive pole pieces and negative pole pieces can be drawn out.
  • One positive pole tab and one negative pole tab are led out respectively, and finally an electrode assembly with a winding structure includes multiple sets of positive pole tabs and negative pole tabs, and then the tab leads are transferred through transfer welding.
  • the structure of the electrode assembly is a stacked sheet structure, and the electrode assembly includes multiple tabs, which may be a positive tab and a negative tab respectively drawn from each layer of positive pole pieces and negative pole pieces. Ears, the final electrode assembly of a laminated structure includes multiple sets of positive and negative pole tabs, and then the tab leads are transferred through transfer welding.
  • the electrochemical device provided in the present application may contain two electrode assemblies, or may contain three or more electrode assemblies.
  • the preparation method of the electrochemical device containing two electrode assemblies or three or more electrode assemblies can refer to the preparation method of the above electrochemical device. Electrochemical devices comprising three or more electrode assemblies are also within the scope of protection defined by the claims of the present application.
  • the present application also provides an electronic device, which includes the electrochemical device provided in the present application.
  • the electronic device in this application is not particularly limited, and it may be any electronic device known in the prior art. Examples of electronic devices include, but are not limited to, notebook computers, pen-based computers, mobile computers, e-book players, cellular phones, portable fax machines, portable copiers, portable printers, headsets, VCRs, LCD televisions, portable Cleaners, portable CD players, mini discs, transceivers, electronic organizers, calculators, memory cards, portable recorders, radios, backup power supplies, electric motors, automobiles, motorcycles, power-assisted bicycles, bicycles, lighting appliances, toys, game consoles , clocks, electric tools, flashlights, cameras, large household batteries and lithium-ion capacitors, etc.
  • the coating weight m1-m2;
  • Thickness expansion rate (h2-h1)/h1 ⁇ 100%.
  • Preparation of the negative pole piece mix the negative active material artificial graphite, conductive carbon black (Super P), and styrene-butadiene rubber (SBR) in a weight ratio of 96:1.5:2.5, add deionized water as a solvent, and prepare A slurry with a solid content of 70wt%, and stirred evenly.
  • the slurry was uniformly coated on one surface of a negative electrode current collector copper foil with a thickness of 10 ⁇ m, and dried at 110° C. to obtain a negative electrode sheet with a coating thickness of 150 ⁇ m coated on one side with a negative electrode active material layer.
  • the above steps are repeated on the other surface of the negative electrode sheet to obtain a negative electrode sheet coated with negative electrode active material layers on both sides. Then, the negative electrode sheet was cut into a size of 41 mm ⁇ 61 mm for use.
  • the positive active material lithium cobaltate (LiCoO 2 ), conductive carbon black (Super P), and polyvinylidene fluoride (PVDF) were mixed according to the weight ratio of 97.5:1.0:1.5, and N - Using methylpyrrolidone (NMP) as a solvent, prepare a slurry with a solid content of 75 wt%, and stir evenly. The slurry was uniformly coated on one surface of a positive electrode current collector aluminum foil with a thickness of 12 ⁇ m, and dried at 90° C. to obtain a positive electrode sheet with a positive electrode active material layer thickness of 100 ⁇ m. On the other surface of the positive electrode current collector aluminum foil, the above steps were repeated to obtain a positive electrode sheet coated with a positive electrode active material layer on both sides. Then, cut the positive electrode sheet into a size of 38mm ⁇ 58mm for use.
  • NMP methylpyrrolidone
  • each electrode assembly includes a positive electrode tab and a negative electrode tab, and a polyethylene (PE) film with a thickness of 15 ⁇ m is selected as the separator.
  • PE polyethylene
  • Assembly of electrode assembly A Place the aluminum-plastic film 1 formed by punching the pit in the assembly jig with the pit face up, place the electrode assembly A in the pit with the diaphragm face up, and then place the separator on the electrode On component A, make the edges aligned, and apply external force to press to obtain the assembled semi-finished product.
  • Liquid injection encapsulation separately inject electrolyte solution into the two cavities of the assembled electrode assembly, and lead all the tabs of the electrode assembly A and B out of the aluminum plastic film.
  • Embodiment 2-23 and comparative example 1 are identical to Embodiment 2-23 and comparative example 1
  • W1 represents the coating weight of the negative electrode active material layer in the electrode assembly A, and the unit is mg/1540.25mm 2 ;
  • CB1 represents the CB value of electrode assembly A
  • C2 represents the capacity of electrode assembly B
  • the capacity retention rate can reach more than 80%. This is because, through CB1 and CB2 satisfying the above relationship, the first electrode assembly and the second electrode assembly form the solid electrolyte interfacial film in the formation stage, the lithium content consumed in the positive electrode sheet matches, and the lithium content in the positive electrode sheet can be reduced. In the subsequent series charge and discharge process, the risk of the positive electrode sheet potential in a certain electrode assembly being too high can inhibit the destruction of the positive electrode active material in the positive electrode sheet and the solid electrolyte interface film structure, thereby improving the internal series connection of high output voltage batteries. cycle performance.
  • the capacity retention rate can be further improved to more than 85%, and the battery expansion rate can be further reduced to less than 8%; at this time, the reversible capacity corresponding to the same area of the negative electrode active material layer in the first electrode assembly and the second electrode assembly can be Matching can make the adaptability of each electrode assembly to the charge and discharge rate relatively consistent, thereby further improving the cycle performance and safety performance of the internal series high output voltage battery.

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

Abstract

L'invention concerne un dispositif électrochimique, comprenant un boîtier et un premier ensemble électrode et un second ensemble électrode qui sont disposés dans le boîtier. Le premier ensemble d'électrodes et le second ensemble d'électrodes sont en connexion en série, et satisfont la relation suivante : formule (I), dans laquelle C1 représente la capacité du premier ensemble d'électrodes, et C2 représente la capacité du second ensemble d'électrodes. L'invention concerne également un dispositif électronique comprenant un dispositif électrochimique.
PCT/CN2022/079189 2022-03-04 2022-03-04 Dispositif électrochimique et dispositif électronique WO2023164914A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280010319.5A CN116830341A (zh) 2022-03-04 2022-03-04 电化学装置及电子装置
PCT/CN2022/079189 WO2023164914A1 (fr) 2022-03-04 2022-03-04 Dispositif électrochimique et dispositif électronique

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PCT/CN2022/079189 WO2023164914A1 (fr) 2022-03-04 2022-03-04 Dispositif électrochimique et dispositif électronique

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WO2023164914A1 true WO2023164914A1 (fr) 2023-09-07

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201838680U (zh) * 2010-10-30 2011-05-18 比亚迪股份有限公司 一种软包装电池
US20130323563A1 (en) * 2012-05-29 2013-12-05 Soomi Eo Pouch type secondary battery
CN105514350A (zh) * 2014-09-25 2016-04-20 东莞新能源科技有限公司 锂离子电池
JP2019145628A (ja) * 2018-02-20 2019-08-29 Tdk株式会社 活物質粒子およびそれを用いた蓄電デバイス
WO2021020708A1 (fr) * 2019-07-29 2021-02-04 삼성에스디아이(주) Batterie secondaire
CN112768783A (zh) * 2021-01-07 2021-05-07 Oppo广东移动通信有限公司 电池组件及其制备方法、电子设备
CN113261151A (zh) * 2020-06-30 2021-08-13 宁德新能源科技有限公司 一种电化学装置用隔板、电化学装置及电子装置
CN113906583A (zh) * 2019-06-20 2022-01-07 苹果公司 具有不同的电极和集流体特性以实现充电率平衡的非对称电池组
CN113921993A (zh) * 2021-09-30 2022-01-11 宁德新能源科技有限公司 一种电化学装置及包含该电化学装置的电子装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201838680U (zh) * 2010-10-30 2011-05-18 比亚迪股份有限公司 一种软包装电池
US20130323563A1 (en) * 2012-05-29 2013-12-05 Soomi Eo Pouch type secondary battery
CN105514350A (zh) * 2014-09-25 2016-04-20 东莞新能源科技有限公司 锂离子电池
JP2019145628A (ja) * 2018-02-20 2019-08-29 Tdk株式会社 活物質粒子およびそれを用いた蓄電デバイス
CN113906583A (zh) * 2019-06-20 2022-01-07 苹果公司 具有不同的电极和集流体特性以实现充电率平衡的非对称电池组
WO2021020708A1 (fr) * 2019-07-29 2021-02-04 삼성에스디아이(주) Batterie secondaire
CN113261151A (zh) * 2020-06-30 2021-08-13 宁德新能源科技有限公司 一种电化学装置用隔板、电化学装置及电子装置
CN112768783A (zh) * 2021-01-07 2021-05-07 Oppo广东移动通信有限公司 电池组件及其制备方法、电子设备
CN113921993A (zh) * 2021-09-30 2022-01-11 宁德新能源科技有限公司 一种电化学装置及包含该电化学装置的电子装置

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