WO2022143262A1 - Dispositif de stockage d'énergie - Google Patents

Dispositif de stockage d'énergie Download PDF

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Publication number
WO2022143262A1
WO2022143262A1 PCT/CN2021/139718 CN2021139718W WO2022143262A1 WO 2022143262 A1 WO2022143262 A1 WO 2022143262A1 CN 2021139718 W CN2021139718 W CN 2021139718W WO 2022143262 A1 WO2022143262 A1 WO 2022143262A1
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Prior art keywords
lithium
negative electrode
positive electrode
energy storage
storage device
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PCT/CN2021/139718
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English (en)
Chinese (zh)
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范鑫铭
蔡伟平
陈志勇
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广东微电新能源有限公司
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Publication of WO2022143262A1 publication Critical patent/WO2022143262A1/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
    • H01M10/056—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
    • 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
    • H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
    • 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
    • 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
    • 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 the technical field of batteries, and more particularly, to an energy storage device.
  • the electrolyte and electrode materials in the battery are prone to side reactions during the charging and discharging process, resulting in irreversible attenuation of the battery capacity.
  • An object of the present disclosure is to provide a new technical solution for an energy storage device.
  • an energy storage device comprising a positive electrode sheet, a negative electrode sheet, a gel polymer electrolyte membrane and an ether-based electrolyte;
  • the gel polymer electrolyte membrane is arranged between the positive electrode sheet and the negative electrode sheet, and the ether-based electrolyte is filled between the positive electrode sheet, the negative electrode sheet and the gel polymer electrolyte membrane ;
  • the components of the ether-based electrolyte include: lithium bisfluorosulfonimide, 1,2-dimethoxyethane and 1,1,2,2-tetrafluoroethyl 2,2,3,3- Tetrafluoropropane ether.
  • the lithium bisfluorosulfonimide, the 1,2-dimethoxyethane and the 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoroethylene is 0.5-1.5:0.5-1.5:3.
  • the gel polymer electrolyte membrane includes polyvinyl alcohol-lithium sulfate and/or polyvinyl alcohol-lithium nitrate.
  • the thickness of the gel polymer electrolyte membrane is 10 ⁇ m-50 ⁇ m.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode material coated on the negative electrode current collector, and the negative electrode material includes polypyrrole-lithium vanadate and/or polypyrrole-lithium titanate.
  • the negative electrode material further includes a conductive agent and a binder, and the conductive agent and the binder are mixed with the polypyrrole-lithium vanadate and/or the polypyrrole-lithium titanate .
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode material coated on the positive electrode current collector, and the positive electrode material includes lithium cobalt oxide, lithium manganate, lithium nickel manganate, lithium nickel cobalt manganate or Lithium-rich manganese.
  • the positive electrode material further includes a conductive agent and a binder, and the conductive agent and the binder are combined with the lithium cobaltate, the lithium manganate, the lithium nickel manganate, the nickel Lithium cobalt manganate or lithium rich manganese mixed together.
  • it includes a plurality of the positive electrode sheets, a plurality of the negative electrode sheets and a plurality of gel polymer electrolyte membranes, the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately and stacked, and the adjacent ones
  • the gel polymer electrolyte membrane is arranged between the positive electrode sheet and the negative electrode sheet to form a laminated structure.
  • the positive electrode sheet, the negative electrode sheet and the gel polymer electrolyte membrane are stacked and arranged to form a winding structure.
  • the wettability of the gel polymer electrolyte can be improved, the ionic conductivity can be improved, and the rate capability of the energy storage device can be improved.
  • FIG. 1 is a schematic structural diagram of an energy storage device in an embodiment of the present disclosure.
  • FIG. 2 is a discharge capacity diagram of an energy storage device in an embodiment of the present disclosure under different charge and discharge rates.
  • FIG. 3 is a graph of the capacitance change of the energy storage device in an embodiment of the present disclosure when cycled at a current density of 2C.
  • an energy storage device As shown in FIG. 1 , the energy storage device includes a positive electrode sheet 21 , a negative electrode sheet 22 , a gel polymer electrolyte membrane 23 and an ether-based electrolyte 3 .
  • the gel polymer electrolyte membrane 23 is arranged between the positive electrode sheet 21 and the negative electrode sheet 22, and the ether-based electrolyte 3 is filled in the positive electrode sheet 21, the negative electrode sheet 22 and the gel between the polymer electrolyte membranes 23 .
  • the components of the ether-based electrolyte include: lithium bisfluorosulfonimide (LiFSI), 1,2-dimethoxyethane (DME) and 1,1,2,2-tetrafluoroethyl 2, 2,3,3-Tetrafluoropropane ether (TTE).
  • LiFSI lithium bisfluorosulfonimide
  • DME 1,2-dimethoxyethane
  • TTE 1,1,2,2-tetrafluoroethyl 2, 2,3,3-Tetrafluoropropane ether
  • the housing 1 of the energy storage device has an accommodating cavity, and the battery cells 2 are arranged in the accommodating cavity.
  • the positive electrode sheet, the negative electrode sheet and the gel polymer electrolyte membrane form the structure of the battery cell 2 .
  • the ether-based electrolyte is filled between the positive electrode sheet, the negative electrode sheet and the gel polymer electrolyte membrane, so that the battery core 2 is in the ether-based electrolyte.
  • the cell 2 is in the ether-based electrolyte, so that the electrolyte wraps the cell 2 .
  • the gel polymer electrolyte membrane acts as a separator between the positive electrode sheet and the negative electrode sheet, and can selectively pass ions.
  • Gel polymer electrolyte membranes are thin films formed by gel polymer dielectric preparation.
  • the ether-based electrolyte contains lithium bisfluorosulfonimide, 1,2-dimethoxyethane and 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropane ether , the ether-based electrolyte can improve the wettability of the gel polymer electrolyte, so as to improve the electrical conductivity of the ions in the energy storage device, thereby improving the rate performance of the energy storage device. That is, the charge-discharge capacity of the energy storage device is improved under the action of the gel polymer electrolyte membrane and the ether-based electrolyte in this embodiment.
  • the molar ratio of tetrafluoropropane ether is 0.5-1.5:0.5-1.5:3.
  • the different proportions of components in the ether-based electrolyte make the ether-based electrolyte have completely different effects on improving the battery capacity in energy storage devices, especially on the wettability of the gel polymer electrolyte.
  • lithium bisfluorosulfonimide, the 1,2-dimethoxyethane, and the 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetra The molar ratio of fluoropropane ether effectively improves the wettability of the gel polymer electrolyte (GPE), effectively increases the electrical conductivity of ions in the electrolyte, and further increases the rate capability of the electrical capacity of the energy storage device. improve.
  • the gel polymer electrolyte membrane includes polyvinyl alcohol-lithium sulfate (PVA-Li 2 SO 4 ) and/or polyvinyl alcohol-lithium nitrate (PVA-LiNO 3 ).
  • the gel polymer electrolyte membrane is a membrane layer formed by a gel polymer electrolyte, and the gel polymer electrolyte membrane is arranged on the positive electrode sheet and the negative electrode sheet as the electrolyte layer of the energy storage device.
  • Gel polymer electrolytes are materials whose states are intermediate between solid electrolytes and liquid electrolytes, and have the advantages of high electrical conductivity, electrochemical stability, high mechanical strength, and high lithium ion migration numbers.
  • the gel polymer electrolyte membrane can adapt to the structure of different forms of energy storage devices, and the gel polymer electrolyte membrane has excellent structural processability, which can improve the flexibility of energy storage device design in accordance with the structural requirements of energy storage devices.
  • the gel polymer electrolyte membrane can be formed by different molding methods, so that the gel polymer electrolyte membrane can exhibit different structural characteristics, so that it is easier to confine the ether-based electrolyte in the structure of the gel polymer electrolyte membrane, which promotes the The interaction between the gel polymer electrolyte membrane and the ether-based electrolyte further improves the wettability of the gel polymer electrolyte.
  • the thickness of the gel polymer electrolyte membrane is 10 ⁇ m-50 ⁇ m.
  • a gel polymer electrolyte membrane with a thickness of 10 ⁇ m-50 ⁇ m is formed by pressing the gel polymer electrolyte, so as to be more easily arranged on the positive electrode sheet and the negative electrode sheet.
  • a gel polymer electrolyte membrane is attached to the positive electrode sheet and the negative electrode sheet.
  • the gel polymer electrolyte membrane and the ether-based electrolyte enable the positive electrode sheet and the negative electrode sheet to fully participate in the reaction, and the gel polymer electrolyte membrane further improves the conductivity of ions in the electrolyte under the action of the ether-based electrolyte. For example, the conductivity of lithium ions in the electrolyte is increased.
  • the gel polymer electrolyte membrane can effectively exchange ions between the positive electrode sheet and the negative electrode sheet, so as to satisfy the function of the electrolyte charge-discharge reaction.
  • the gel polymer electrolyte membrane does not occupy too much space, so that the battery cell can be provided with more positive electrode sheets and negative electrode sheets under a limited volume.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode material coated on the negative electrode current collector, and the negative electrode material includes polypyrrole-lithium vanadate (PPy-LVO) and/or polypyrrole- Lithium Titanate (PPy-LTO).
  • the negative electrode material includes polypyrrole-lithium vanadate (PPy-LVO) and/or polypyrrole- Lithium Titanate (PPy-LTO).
  • the negative electrode material includes polypyrrole-lithium vanadate and/or polypyrrole-lithium titanate, and the negative electrode material has better stability.
  • the phenomenon of dissolution and deposition of the electrode during the reaction process is reduced, and the damage to the electrode is effectively reduced, so as to avoid piercing or forming holes on the electric core.
  • the negative electrode material effectively avoids the safety problem caused by the short circuit between the positive electrode sheet and the negative electrode sheet.
  • a polypyrrole layer is formed on the surface of the lithium vanadate material to obtain a polypyrrole-lithium vanadate material.
  • a polypyrrole layer is formed on the surface of the lithium titanate material to obtain a polypyrrole-lithium titanate material.
  • the polypyrrole material forms a conductive coating, which improves the stability of the material.
  • the negative electrode material is more stable in the electrolyte, which effectively reduces the consumption and damage to the negative electrode material during the reaction process of the energy storage device, and reduces the short circuit between the negative electrode and the positive electrode of the energy storage device due to the formation of dendrites piercing the isolation layer and the positive electrode of the energy storage device. safety of the device.
  • the negative electrode material further includes a conductive agent and a binder, and the conductive agent and the binder are mixed with the polypyrrole-lithium vanadate and/or the polypyrrole-lithium titanate together.
  • setting the negative electrode material requires mixing a conductive agent and a binder with polypyrrole-lithium vanadate and/or polypyrrole-lithium titanate in a deionized water solvent to form a slurry.
  • the negative electrode sheet is formed by coating the negative electrode material on the negative electrode current collector.
  • the negative electrode material is a slurry, and the slurry is coated on the negative electrode current collector, and the slurry needs to be solidified to form a negative electrode sheet. For example, moisture is evaporated by drying to solidify the slurry on the negative electrode current collector.
  • the solidified slurry and the negative electrode current collector are solidified to form an integrated structure.
  • the conductive agent, the binder, and the polypyrrole-lithium vanadate and/or the polypyrrole-lithium titanate are uniformly mixed in a deionized water solvent to form a slurry.
  • the binder in the slurry makes the materials in the negative electrode material bond together more firmly, and makes the slurry bond with the negative electrode current collector more easily.
  • the conductive agent can improve the conductive effect of the negative electrode sheet.
  • the negative electrode current collector is a copper foil, and the slurry made of the negative electrode material is coated on the copper foil, and processed to form a negative electrode sheet.
  • the conductive agent may be conductive carbon black, acetylene black, carbon nanotubes, and the like.
  • the adhesive may be styrene butadiene rubber (SBR).
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode material coated on the positive electrode current collector, and the positive electrode material includes lithium cobalt oxide, lithium manganate, lithium nickel manganate, nickel cobalt manganate Lithium or Li-rich Manganese.
  • the positive electrode sheet is formed by coating the positive electrode material on the positive electrode current collector.
  • the positive electrode current collector is an aluminum foil, and the aluminum foil is coated with lithium cobalt oxide, lithium manganate, lithium nickel manganate, lithium nickel cobalt manganate, or lithium-rich manganese to form a positive electrode sheet.
  • Lithium cobalt oxide, lithium manganate, lithium nickel manganese oxide, lithium nickel cobalt manganate, or lithium-rich manganese as cathode materials can effectively provide lithium ions to participate in the reaction, reduce the consumption of cathode current collectors, and improve the efficiency of cathode current collectors.
  • the electrical contact between the positive electrode materials ensures the electrical capacity of the energy storage device.
  • the positive electrode material further includes a conductive agent and a binder, and the conductive agent and the binder are combined with the lithium cobaltate, the lithium manganate, the lithium nickel manganate, the The nickel-cobalt lithium manganate or lithium-rich manganese are mixed together.
  • setting the positive electrode material requires mixing the conductive agent and the binder with lithium cobalt oxide, lithium manganate, lithium nickel manganate, lithium nickel cobalt manganate or lithium rich manganese to form a slurry,
  • the slurry is coated on the surface of the positive electrode current collector to form a positive electrode sheet.
  • the positive electrode material slurry is formed by adding lithium cobalt oxide, lithium manganate, lithium nickel manganate, lithium nickel cobalt manganate or lithium-rich manganese, a conductive agent and a binder into an N-methylpyrrolidone solvent and mixing evenly.
  • the conductive agent can improve the conductivity of the positive electrode material.
  • Adhesives can improve the firmness of the materials mixed together, for example, the paste can bond the materials together after curing.
  • the adhesive can also form a firm bond between the positive electrode current collector and the positive electrode material.
  • the conductive agent may be conductive carbon black, carbon nanotubes, or the like.
  • the binder may be polyvinylidene fluoride (PVDF).
  • the positive electrode material is coated on the positive electrode current collector and cured to form a positive electrode sheet.
  • the negative electrode material is cured by drying, and the water evaporates after curing, so that the negative electrode material is solidified on the negative electrode current collector.
  • the positive electrode material is solidified on the positive electrode current collector to form the substrate of the positive electrode sheet, and the substrate of the positive electrode sheet is cut to meet the requirements of different cells for the structure of the positive electrode sheet, and the corresponding structure of the positive electrode sheet is prepared.
  • the negative electrode material is coated on the negative electrode current collector and cured to form a negative electrode sheet.
  • the negative electrode material is solidified on the negative electrode current collector to form the substrate of the negative electrode sheet, and the substrate of the negative electrode sheet is cut to meet the requirements of different cells for the structure of the negative electrode sheet, and the negative electrode sheet of the corresponding structure is prepared.
  • the energy storage device includes a plurality of the positive electrode sheets, a plurality of the negative electrode sheets and a plurality of gel polymer electrolyte membranes, the plurality of positive electrode sheets and the plurality of The negative electrode sheets are arranged alternately and stacked, and the gel polymer electrolyte membrane is arranged between the adjacent positive electrode sheets and the negative electrode sheets to form a stacked sheet structure.
  • the positive electrode sheet, the negative electrode sheet and the gel polymer electrolyte membrane may have a circular sheet structure, a square structure, a rectangular structure or an irregular patterned structure.
  • the positive electrode sheet, the negative electrode sheet and the gel polymer electrolyte membrane are prepared in the same structure, and the stack structure cell 2 is formed by alternately stacking the positive electrode sheet, the negative electrode sheet and the gel polymer electrolyte membrane.
  • the battery cell 2 is suitable for an energy storage device requiring a laminated structure battery cell.
  • the housing 1 forms an accommodating cavity of the energy storage device
  • the battery cell 2 is arranged in the accommodating cavity, and ether-based electrolyte is added.
  • an energy storage device is prepared.
  • the prepared energy storage device is, for example, a coin cell battery.
  • a positive electrode sheet, a negative electrode sheet, and a gel polymer electrolyte membrane are prepared in a disc structure.
  • the diameters of the positive electrode sheet, the negative electrode sheet and the gel polymer electrolyte membrane of the disc structure are, for example, 14 mm, 16 mm, 18 mm or 20 mm.
  • the added ether-based electrolyte is, for example, 0.01 mL-0.03 mL.
  • the positive electrode sheet, the negative electrode sheet and the gel polymer electrolyte membrane are stacked and arranged to form a winding structure.
  • the laminated structure of the positive electrode sheet, the negative electrode sheet and the gel polymer electrolyte membrane is wound to form a battery core of the wound structure.
  • the gel polymer electrolyte membrane forms a separation between the positive electrode sheet and the negative electrode sheet, and the gel polymer electrolyte membrane acts as a separator.
  • the positive electrode sheet and the negative electrode sheet gel polymer electrolyte membrane are cut into sheet-like structures with a width of 3mm-5mm and a length of 350mm-500mm, and are stacked to form a rolled structure.
  • the battery core with the winding structure is put into the accommodating cavity of the casing, 0.1-0.5 mL of ether-based electrolyte is added, and the casing 1 is sealed.
  • the prepared energy storage device is, for example, a coin cell battery.
  • the positive electrode material on the positive electrode sheet of the energy storage device includes lithium cobalt oxide.
  • the negative electrode material on the negative electrode sheet includes polypyrrole-lithium vanadate.
  • the electrolyte is ether-based electrolyte, and gel polymer electrolyte membranes are arranged on the positive electrode sheet and the negative electrode sheet.
  • the energy storage device was tested for discharge capacity at a voltage of 4.4V and a rate of 2C, 3C, 4C, and 5C, and cycled for 180 cycles.
  • the discharge capacities of the energy storage device at rates of 2C, 3C, 4C, and 5C correspond to 172mAhg -1 , 167mAhg -1 , 165mAhg -1 , and 161mAhg -1 .
  • the energy storage device enables the energy storage device to have higher discharge capacity at different rates under the action of the gel polymer electrolyte, the ether-based electrolyte, the positive electrode material and the negative electrode material. Due to the protective layer formed by polypyrrole and the role of the gel polymer electrolyte, the dissolution of lithium vanadate and lithium titanate in the negative electrode material is effectively suppressed, the resistance of charge transfer is reduced, and the volume change of the electrode during cycling is buffered. The cycle performance of the energy storage device is further improved.
  • the discharge capacity of the energy storage device can maintain a high discharge capacity at different rates, and has better rate performance compared to the energy storage device in the prior art.
  • Example 2 Under the conditions of Example 1, the ether-based electrolyte was replaced with the lithium ion electrolyte used in the existing energy storage device. At room temperature, the discharge capacity of the energy storage device was tested at a voltage of 4.4V and a rate of 2C, 3C, 4C, and 5C. After 180 cycles, the discharge capacity was 170mAhg -1 , 160mAhg -1 , 152mAhg -1 , 140mAhg -1 , the capacity retention rate of 180 cycles is 85%.
  • the ether-based electrolyte in the present disclosure can effectively improve the retention rate of the discharge capacity.
  • the discharge capacity can be kept stable under the condition of multiple cycles.
  • the ether-based electrolyte has an obvious effect on the gel polymer electrolyte, improving the wettability and increasing the electrical conductivity, thereby improving the performance at different rates.
  • the positive electrode material on the positive electrode sheet of the energy storage device includes lithium manganate.
  • the negative electrode material on the negative electrode sheet includes polypyrrole-lithium vanadate.
  • the electrolyte is ether-based electrolyte, and gel polymer electrolyte membranes are arranged on the positive electrode sheet and the negative electrode sheet.
  • the energy storage device was tested for discharge capacity at a voltage of 4.2V and a rate of 2C, 3C, 4C, and 5C, and cycled for 180 cycles.
  • the discharge capacity of the energy storage device corresponds to 125mAhg -1 , 123mAhg -1 , 122mAhg -1 , and 120mAhg -1 .
  • the positive electrode material on the positive electrode sheet of the energy storage device includes a high nickel ternary.
  • the negative electrode material on the negative electrode sheet includes polypyrrole-lithium vanadate.
  • the electrolyte is ether-based electrolyte, and gel polymer electrolyte membranes are arranged on the positive electrode sheet and the negative electrode sheet.
  • the energy storage device was tested for the discharge capacity at a voltage of 4.3V and a rate of 2C, 3C, 4C, and 5C for 180 cycles.
  • the discharge capacity of the energy storage device corresponds to 180mAhg -1 , 177mAhg -1 , 175mAhg -1 , and 174mAhg -1 .
  • the energy storage device can maintain the discharge capacity without loss under various angles of bending, extrusion and folding, and has excellent flexibility. In the case of perforation, the stability of the energy storage device will not be destroyed, so that the energy storage device has excellent safety performance.

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Abstract

L'0invention concerne un dispositif de stockage d'énergie, comprenant une feuille d'électrode positive, une feuille d'électrode négative, une membrane électrolytique polymère en gel et un électrolyte à base d'éther. La membrane électrolytique polymère en gel est disposée entre la feuille d'électrode positive et la feuille d'électrode négative. L'électrolyte à base d'éther est rempli entre la feuille d'électrode positive, la feuille d'électrode négative et la membrane électrolytique polymère en gel. Les composants de l'électrolyte à base d'éther comprennent : du bis(trifluorométhanesulfonyle)imide de lithium, du 1,2-diméthoxyéthane et du 1,1,2,2-tétrafluoroéthyl 2,2,3,3-tétrafluoro propane éther.
PCT/CN2021/139718 2020-12-31 2021-12-20 Dispositif de stockage d'énergie WO2022143262A1 (fr)

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