WO2021127997A1 - 二次电池及含有该二次电池的装置 - Google Patents

二次电池及含有该二次电池的装置 Download PDF

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Publication number
WO2021127997A1
WO2021127997A1 PCT/CN2019/127976 CN2019127976W WO2021127997A1 WO 2021127997 A1 WO2021127997 A1 WO 2021127997A1 CN 2019127976 W CN2019127976 W CN 2019127976W WO 2021127997 A1 WO2021127997 A1 WO 2021127997A1
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Prior art keywords
secondary battery
lithium
electrolyte
mol
battery according
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PCT/CN2019/127976
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English (en)
French (fr)
Chinese (zh)
Inventor
梁成都
吴则利
陈培培
付成华
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Priority to JP2022522047A priority Critical patent/JP7381737B2/ja
Priority to CN201980098832.2A priority patent/CN114175338B/zh
Priority to EP19958003.6A priority patent/EP3930067B1/en
Priority to KR1020227012242A priority patent/KR102585596B1/ko
Priority to PCT/CN2019/127976 priority patent/WO2021127997A1/zh
Publication of WO2021127997A1 publication Critical patent/WO2021127997A1/zh
Priority to US17/550,934 priority patent/US12300785B2/en
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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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0568—Liquid materials characterised by the solutes
    • 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
    • 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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0569—Liquid materials characterised by the solvents
    • 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
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • H01M4/364—Composites as mixtures
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
    • 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
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • 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
    • 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
    • H01M2004/028—Positive electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H01M2300/0028—Organic electrolyte characterised by the solvent
    • H01M2300/0037—Mixture of solvents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H01M2300/0028—Organic electrolyte characterised by the solvent
    • H01M2300/0037—Mixture of solvents
    • H01M2300/004—Three solvents
    • 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
    • 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 battery technology, and in particular to a secondary battery and a device containing the secondary battery.
  • the present application provides a secondary battery and a device containing the secondary battery.
  • the secondary battery can have both good high-temperature cycle performance and high-temperature cycle performance under the premise of higher energy density. High temperature storage performance.
  • the first aspect of the present application provides a secondary battery
  • the secondary battery includes an electrolyte
  • the electrolyte includes an electrolyte salt and an organic solvent
  • the electrolyte salt includes lithium bisfluorosulfonimide ( LiFSI) and lithium hexafluorophosphate (LiPF 6 );
  • the molar concentration of the lithium bisfluorosulfonimide (LiFSI) in the electrolyte is 0.8 mol/L to 1.2 mol/L;
  • the lithium hexafluorophosphate (LiPF 6 ) is The volume molar concentration in the electrolyte is 0.15 mol/L to 0.4 mol/L;
  • the organic solvent includes ethylene carbonate (EC), and the content of the ethylene carbonate (EC) in the organic solvent is The proportion is less than or equal to 20%. .
  • a device which includes the secondary battery described in the first aspect of the present application.
  • the electrolyte salt in the electrolyte includes both lithium bisfluorosulfonimide (LiFSI) and lithium hexafluorophosphate (LiPF 6 ) at a specific content, and the organic solvent includes a specific content of ethylene carbonate (EC).
  • LiFSI lithium bisfluorosulfonimide
  • LiPF 6 lithium hexafluorophosphate
  • EC ethylene carbonate
  • the secondary battery has both good high-temperature cycle performance and high-temperature storage performance at the same time.
  • the device of the present application includes the secondary battery and therefore has at least the same advantages as the secondary battery.
  • FIG. 1 is a schematic diagram of an embodiment of a secondary battery.
  • Fig. 2 is a schematic diagram of an embodiment of a battery module.
  • Fig. 3 is a schematic diagram of an embodiment of a battery pack.
  • Fig. 4 is an exploded view of Fig. 3.
  • Fig. 5 is a schematic diagram of an embodiment of a device in which a secondary battery is used as a power source.
  • the secondary battery includes an electrolyte
  • the electrolyte includes an electrolyte salt and an organic solvent
  • the electrolyte salt includes lithium bisfluorosulfonimide (LiFSI) and lithium hexafluorophosphate (LiPF 6 )
  • the molar concentration of the lithium bisfluorosulfonimide (LiFSI) in the electrolyte is 0.8 mol/L to 1.2 mol/L
  • the lithium hexafluorophosphate (LiPF 6 ) is in the electrolyte
  • the volume molar concentration in the organic solvent is 0.15 mol/L to 0.4 mol/L
  • the organic solvent includes ethylene carbonate (EC)
  • the mass ratio of the ethylene carbonate (EC) in the organic solvent is less than or equal to 20%.
  • the inventors have discovered through a lot of research that when the electrolyte simultaneously satisfies the electrolyte salt including lithium bisfluorosulfonimide (LiFSI) and lithium hexafluorophosphate (LiPF 6 ), the double The molar concentration of lithium fluorosulfonimide (LiFSI) in the electrolyte is 0.8 mol/L to 1.2 mol/L, and the molar concentration of lithium hexafluorophosphate (LiPF 6 ) in the electrolyte is 0.1 mol /L ⁇ 0.4mol/L, and the organic solvent includes ethylene carbonate (EC), and the mass proportion of the ethylene carbonate (EC) in the organic solvent is ⁇ 20%, under the combined action of the above conditions, two The secondary battery has good high temperature cycle performance and high temperature storage performance.
  • LiFSI lithium bisfluorosulfonimide
  • LiPF 6 lithium hexafluorophosphate
  • the inventor guessed that the possible reason for the above-mentioned beneficial effects is that when LiFSI and LiPF 6 are combined as an electrolyte salt, and when the molar concentration of the two is controlled within a specific range, the advantages of the two complement each other and can effectively alleviate the oxidation of LiFSI on the positive electrode.
  • the impact on the cycle performance of the secondary battery; at the same time, on the basis of the above-mentioned mixed electrolyte salt, the organic solvent also includes a specific content of ethylene carbonate (EC), which can dissociate the above-mentioned mixed electrolyte salt well, and The high-temperature storage performance of the battery can be further improved.
  • EC ethylene carbonate
  • the molar concentration of the lithium bisfluorosulfonimide (LiFSI) in the electrolyte is 0.9 mol/L to 1.2 mol/L.
  • the molar concentration of lithium bisfluorosulfonimide (LiFSI) in the electrolyte is within this range, the high-temperature storage performance of the battery can be further improved.
  • the molar concentration of the lithium hexafluorophosphate (LiPF 6 ) in the electrolyte is 0.15 mol/L to 0.3 mol/L.
  • the molar concentration of lithium hexafluorophosphate (LiPF 6 ) in the electrolyte is within this range, the high temperature cycle performance of the battery will be further improved.
  • the mass ratio of the ethylene carbonate (EC) in the organic solvent is ⁇ 15%. If the content of EC is too high, the SEI film formed by the decomposition products on the surface of the negative electrode will be too thick, which will deteriorate the DC resistance of the secondary battery to a certain extent. More preferably, the mass ratio of the ethylene carbonate (EC) in the organic solvent is ⁇ 10%.
  • the molar concentration ratio of the lithium bisfluorosulfonimide (LiFSI) to the lithium hexafluorophosphate (LiPF 6 ) is 3-7:1.
  • the two can better exert a synergistic effect, so that the high-temperature cycle performance and high-temperature storage performance of the secondary battery are better improved.
  • the ratio of the molar concentration of the lithium bisfluorosulfonimide (LiFSI) to the lithium hexafluorophosphate (LiPF 6) is 4-6:1.
  • the organic solvent further includes one of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC) or Several kinds.
  • DMC dimethyl carbonate
  • DEC diethyl carbonate
  • EMC ethyl methyl carbonate
  • the organic solvent further includes ethyl methyl carbonate (EMC), and the mass ratio of the ethyl methyl carbonate (EMC) in the organic solvent is 60%-95%, more preferably 75%-95%.
  • EMC ethyl methyl carbonate
  • the electrolyte further includes additives.
  • the additives include fluoroethylene carbonate (FEC), vinyl sulfate (DTD), 1,3-propane sulfonate Lactone (PS), 1,3-propenyl-sultone (PST), succinic anhydride (SA), lithium difluorooxalate borate (LiDFOB), lithium difluorobisoxalate phosphate (LiDFOP), tris(tris) One or more of methylsilyl)phosphate (TMSP) and tris(trimethylsilyl)borate (TMSB).
  • FEC fluoroethylene carbonate
  • DTD vinyl sulfate
  • PS 1,3-propane sulfonate Lactone
  • PST 1,3-propenyl-sultone
  • SA succinic anhydride
  • LiDFOB lithium difluorooxalate borate
  • LiDFOP lithium difluorobisoxalate phosphate
  • TMSP methyl
  • the electrolytic solution has a conductivity of 6.5 mS/cm to 9.5 mS/cm at 25°C; more preferably, the electrolytic solution has a conductivity of 6.5 mS/cm to 9.5 mS/cm at 25°C.
  • the electrical conductivity is 7.0mS/cm ⁇ 9.0mS/cm.
  • the electrical conductivity of the electrolyte at 25° C. can be tested by a well-known method in the art, and the testing instrument used can be a lightning electrical conductivity device.
  • the molar concentration of the electrolyte salt in the electrolyte is 0.9 mol/L to 1.1 mol/L.
  • the secondary battery further includes a negative electrode piece including a negative electrode current collector and a negative electrode disposed on at least one surface of the negative electrode current collector and including a negative electrode active material Diaphragm.
  • the type of the negative electrode current collector is not particularly limited, and can be selected according to actual needs.
  • the negative electrode current collector can be selected from metal foils, such as copper foil.
  • the negative electrode active material includes one or more of a carbon material and a silicon-based material.
  • the carbon material may include one or more of graphite, soft carbon, and hard carbon; preferably, the carbon material includes graphite, and the graphite is selected from artificial One or more of graphite and natural graphite.
  • the silicon-based material may include one or more of silicon element, silicon alloy, silicon-oxygen compound, silicon-carbon composite, and silicon-nitrogen compound; preferably, the The silicon-based material includes silicon-oxygen compound.
  • the weight of the silicon-based material in the negative electrode active material is ⁇ 40%; more preferably Ground, the weight ratio of the silicon-based material in the negative electrode active material is 15%-30%.
  • the secondary battery further includes a positive pole piece including a positive electrode current collector and a positive electrode provided on at least one surface of the positive electrode current collector and including a positive electrode active material Diaphragm.
  • the type of the positive electrode current collector is not specifically limited, and can be selected according to actual needs.
  • the positive electrode current collector may be selected from metal foils, such as aluminum foil.
  • the positive electrode active material includes one or more of lithium nickel cobalt manganese oxide compound and lithium nickel cobalt aluminum oxide.
  • Lithium nickel cobalt manganese oxide compound and lithium nickel cobalt aluminum oxide have the advantages of high specific capacity and long cycle life as the positive electrode active material of the secondary battery.
  • the positive electrode active material includes the general formula Li a Ni b Co c M d M'e O f A g or at least a part of the surface provided with a coating layer li a Ni b Co c M d M 'e O f a g of one or more materials, wherein, 0.8 ⁇ a ⁇ 1.2,0.5 ⁇ b ⁇ 1,0 ⁇ c ⁇ 1,0 ⁇ d ⁇ 1 , 0 ⁇ e ⁇ 0.1, 1 ⁇ f ⁇ 2, 0 ⁇ g ⁇ 1, M is selected from one or more of Mn and Al, M'is selected from Zr, Al, Zn, Cu, Cr, Mg, Fe One or more of, V, Ti, and B, and A is selected from one or more of N, F, S, and Cl.
  • the coating layer on the surface of the positive electrode active material may be a carbon layer, an oxide layer, an inorganic salt layer or a conductive polymer layer.
  • the cycle performance of the secondary battery can be further improved by coating and modifying the surface of the positive electrode active material.
  • the positive electrode active material may further include lithium nickel oxide (such as lithium nickelate), lithium manganese oxide (such as spinel lithium manganate, layer Lithium manganate), lithium iron phosphate, lithium manganese phosphate, lithium iron manganese phosphate, lithium cobaltate and modified compounds thereof.
  • lithium nickel oxide such as lithium nickelate
  • lithium manganese oxide such as spinel lithium manganate, layer Lithium manganate
  • lithium iron phosphate lithium manganese phosphate
  • lithium iron manganese phosphate lithium iron manganese phosphate
  • lithium cobaltate lithium cobaltate
  • the secondary battery further includes an isolation film
  • the type of the isolation film is not particularly limited, and it may be various isolation films suitable for lithium ion batteries in the field.
  • the isolation film can be selected from one or more of polyethylene film, polypropylene film, polyvinylidene fluoride film and their multilayer composite film.
  • the secondary battery may include an outer package for packaging the positive pole piece, the negative pole piece, and the electrolyte.
  • the positive pole piece, the negative pole piece and the separator can be laminated or wound to form an electrode assembly with a laminated structure or an electrode assembly with a wound structure, the electrode assembly is packaged in an outer package; the electrolyte is infiltrated in the electrode assembly .
  • the number of electrode assemblies in the secondary battery can be one or several, which can be adjusted according to requirements.
  • the outer packaging of the secondary battery may be a soft bag, such as a pouch-type soft bag.
  • the material of the soft bag can be plastic, for example, it can include one or more of polypropylene PP, polybutylene terephthalate PBT, polybutylene succinate PBS, and the like.
  • the outer packaging of the secondary battery may also be a hard case, such as an aluminum case.
  • Fig. 1 shows a secondary battery 5 with a square structure as an example.
  • the secondary battery can be assembled into a battery module, and the number of secondary batteries contained in the battery module can be multiple, and the specific number can be adjusted according to the application and capacity of the battery module.
  • Fig. 2 is a battery module 4 as an example.
  • a plurality of secondary batteries 5 may be arranged in sequence along the length direction of the battery module 4. Of course, it can also be arranged in any other manner. Furthermore, the plurality of secondary batteries 5 can be fixed by fasteners.
  • the battery module 4 may further include a housing having an accommodating space, and a plurality of secondary batteries 5 are accommodated in the accommodating space.
  • the above-mentioned battery modules can also be assembled into a battery pack, and the number of battery modules contained in the battery pack can be adjusted according to the application and capacity of the battery pack.
  • Figures 3 and 4 show the battery pack 1 as an example. 3 and 4, the battery pack 1 may include a battery box and a plurality of battery modules 4 provided in the battery box.
  • the battery box includes an upper box body 2 and a lower box body 3.
  • the upper box body 2 can be covered on the lower box body 3 and forms a closed space for accommodating the battery module 4.
  • a plurality of battery modules 4 can be arranged in the battery box in any manner.
  • a second aspect of the present application provides a device including the secondary battery according to the first aspect of the present application.
  • the secondary battery can be used as a power source of the device, and can also be used as an energy storage unit of the device.
  • the device includes, but is not limited to, mobile devices (such as mobile phones, notebook computers, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf Vehicles, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.
  • the device can select a secondary battery, a battery module, or a battery pack according to its usage requirements.
  • Figure 5 is a device as an example.
  • the device is a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle, etc.
  • battery packs or battery modules can be used.
  • the device may be a mobile phone, a tablet computer, a notebook computer, and the like.
  • the device is generally required to be thin and light, and a secondary battery can be used as a power source.
  • the positive electrode active material LiNi 0.8 Co 0.1 Mn 0.1 O 2
  • the binder polyvinylidene fluoride, and the conductive agent Super P are mixed in a weight ratio of 98:1:1, and N-methylpyrrolidone (NMP) is added.
  • NMP N-methylpyrrolidone
  • the negative active material artificial graphite is mixed with the conductive agent Super P and the binder SBR in a mass ratio of 96:2:2, and deionized water is added.
  • the negative electrode slurry is obtained under the action of a vacuum mixer; the negative electrode slurry is evenly coated on The negative electrode current collector is on the copper foil; the copper foil is dried at room temperature and then transferred to an oven for drying, and then cold pressed and slit to obtain a negative electrode piece.
  • a polyethylene film is used as the isolation film.
  • Example 2-24 and Comparative Example 1-7 adjust the ratio of electrolyte in the secondary battery (See Table 1 for details).
  • the secondary batteries of Examples 25-48 and Comparative Examples 8-14 were prepared according to the following methods
  • the positive electrode active material LiNi 0.8 Co 0.1 Mn 0.1 O 2
  • the binder polyvinylidene fluoride, and the conductive agent Super P are mixed in a weight ratio of 98:1:1, and N-methylpyrrolidone (NMP) is added.
  • NMP N-methylpyrrolidone
  • the negative electrode active material silicon oxide and artificial graphite After mixing the negative electrode active material silicon oxide and artificial graphite at a mass ratio of 2:8, then mix it with the conductive agent Super P and the binder acrylate at a mass ratio of 92:2:6, add deionized water, and place it in a vacuum mixer.
  • the negative electrode slurry is obtained under the action; the negative electrode slurry is evenly coated on the negative electrode current collector copper foil; the copper foil is dried at room temperature and then transferred to an oven for drying, and then cold pressed and slit to obtain a negative electrode pole piece.
  • a polyethylene film is used as the isolation film.
  • the capacity retention rate of the secondary battery after 800 cycles at 45°C (%) (discharge capacity after 800 cycles of the secondary battery/discharge capacity at the first cycle of the secondary battery) ⁇ 100%.
  • volume expansion rate of secondary battery after storage at 60°C for 30 days (%) [(V 2 -V 1 )/V 1 ] ⁇ 100%
  • the secondary battery of the present application can take into account both good high-temperature cycle performance and high-temperature storage performance.
  • comparative examples 1-7 are compared with examples 1-24
  • comparative examples 8-14 are compared with examples 25-48, which are relatively unable to take into account high-temperature cycle performance at the same time. And high temperature storage performance.

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