CN112713301B - Energy storage device - Google Patents
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- CN112713301B CN112713301B CN202011639493.5A CN202011639493A CN112713301B CN 112713301 B CN112713301 B CN 112713301B CN 202011639493 A CN202011639493 A CN 202011639493A CN 112713301 B CN112713301 B CN 112713301B
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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
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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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
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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
- H01M10/0569—Liquid materials characterised by the solvents
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- 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
Abstract
The invention discloses an energy storage device, which comprises a positive plate, a negative plate, a gel polymer electrolyte membrane and an ether-based electrolyte; the gel polymer electrolyte membrane is arranged between the positive plate and the negative plate, and the ether-based electrolyte is filled between the positive plate, the negative plate and the gel polymer electrolyte membrane; the ether-based electrolyte comprises the following components: lithium bis (fluorosulfonyl) imide, 1, 2-dimethoxyethane, and 1,1,2, 2-tetrafluoroethyl 2,2,3, 3-tetrafluoropropane ether. According to one embodiment of the disclosure, through interaction between the gel polymer electrolyte film in the battery cell and the ether-based electrolyte, the wettability of the gel polymer electrolyte can be improved, and the ionic conductivity in the battery is improved, so that the rate capability of the battery is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an energy storage device.
Background
At present, electronic products mainly rely on batteries to provide electric energy, and along with the updating and development of electronic products, batteries also need to adapt to different electronic products. Under the condition of using electronic products for a long time, electrode materials in the battery participate in reaction for a long time, the electrode materials are worn too fast, and the battery capacity is irreversibly attenuated.
In the prior art, the electrolyte and the electrode material in the battery are easy to generate side reaction in the charging and discharging process, so that the battery capacity is irreversibly attenuated.
Therefore, a new technical solution is needed to solve the above technical problems.
Disclosure of Invention
An object of the present invention is to provide a new solution for an energy storage device.
According to a first aspect of the present invention, there is provided an energy storage device comprising a positive electrode sheet, a negative electrode sheet, a gel polymer electrolyte membrane, and an ether-based electrolyte solution;
the gel polymer electrolyte membrane is arranged between the positive plate and the negative plate, and the ether-based electrolyte is filled between the positive plate, the negative plate and the gel polymer electrolyte membrane;
the ether-based electrolyte comprises the following components: lithium bis (fluorosulfonyl) imide, 1, 2-dimethoxyethane, and 1,1,2, 2- tetrafluoroethyl 2,2,3, 3-tetrafluoropropane ether.
Optionally, the molar ratio of the lithium bis-fluorosulfonylimide, the 1, 2-dimethoxyethane, and the 1,1,2, 2- tetrafluoroethyl 2,2,3, 3-tetrafluoropropane ether is 0.5-1.5:0.5-1.5: 3.
Optionally, the gel polymer electrolyte membrane comprises polyvinyl alcohol-lithium sulfate and/or polyvinyl alcohol-lithium nitrate.
Optionally, the gel polymer electrolyte membrane has a thickness of 10 μm to 50 μm.
Optionally, the negative electrode sheet includes a negative electrode current collector and a negative electrode material coated on the negative electrode current collector, where the negative electrode material includes polypyrrole-lithium vanadate and/or polypyrrole-lithium titanate.
Optionally, the negative electrode material further comprises a conductive agent and a binder, and the conductive agent and the binder are mixed together with the polypyrrole-lithium vanadate and/or the polypyrrole-lithium titanate.
Optionally, the positive plate includes a positive current collector and a positive electrode material coated on the positive current collector, and the positive electrode material includes lithium cobaltate, lithium manganate, lithium nickel manganese, lithium nickel cobalt manganese, or lithium-rich manganese.
Optionally, the positive electrode material further comprises a conductive agent and a binder, and the conductive agent and the binder are mixed with the lithium cobaltate, the lithium manganate, the lithium nickel cobalt manganate or the lithium-rich manganese.
Optionally, the laminated structure comprises a plurality of positive plates, a plurality of negative plates and a plurality of gel polymer electrolyte membranes, wherein the positive plates and the negative plates are arranged alternately and in a laminated manner, and the gel polymer electrolyte membranes are arranged between the adjacent positive plates and the adjacent negative plates to form the laminated structure.
Alternatively, the positive electrode sheet, the negative electrode sheet, and the gel polymer electrolyte membrane are stacked and formed in a wound structure.
In one embodiment of the disclosure, through interaction between the gel polymer electrolyte film and the ether-based electrolyte, the wettability of the gel polymer electrolyte can be improved, the ionic conductivity is improved, and thus the rate capability of the energy storage device is improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
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 at different charge and discharge rates in an embodiment of the disclosure.
Fig. 3 is a graph of the change in capacitance of an energy storage device cycled at a current density of 2C in one embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
According to an embodiment of the present disclosure, there is provided an energy storage device, as shown in fig. 1, including 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 plate and the negative plate, and the ether-based electrolyte is filled among the positive plate, the negative plate and the gel polymer electrolyte membrane.
The ether-based electrolyte comprises the following components: lithium bis (fluorosulfonyl) imide (LiFSI), 1, 2-Dimethoxyethane (DME) and 1,1,2, 2- tetrafluoroethyl 2,2,3, 3-tetrafluoropropane ether (TTE).
Energy memory's casing 1 has and holds the chamber, and electric core 2 sets up and holds the intracavity. The positive plate, the negative plate and the gel polymer electrolyte membrane form the structure of the cell 2. The ether-based electrolyte is filled among the positive plate, the negative plate and the gel polymer electrolyte membrane, so that the battery cell 2 is in the ether-based electrolyte.
In this embodiment, the battery cell 2 is in an ether-based electrolyte, so that the electrolyte wraps the battery cell 2. The gel polymer electrolyte membrane plays a role of an isolating layer between the positive plate and the negative plate and can selectively pass ions. The gel polymer electrolyte membrane is a thin film formed by preparing a gel polymer dielectric.
The ether-based electrolyte comprises lithium bis (fluorosulfonyl) imide, 1, 2-dimethoxyethane and 1,1,2, 2- tetrafluoroethyl 2,2,3, 3-tetrafluoropropane ether, and can improve the wetting performance of a gel polymer electrolyte, so that the ionic conductivity in an energy storage device is improved, and the rate capability of the energy storage device can be improved. Namely, the gel polymer electrolyte membrane and the ether-based electrolyte in this embodiment improve the charge and discharge capacity of the energy storage device.
In one embodiment, the molar ratio of the lithium bis-fluorosulfonylimide, the 1, 2-dimethoxyethane, and the 1,1,2, 2- tetrafluoroethyl 2,2,3, 3-tetrafluoropropane ether is from 0.5 to 1.5:0.5-1.5: 3.
the different component proportions in the ether-based electrolyte enable the ether-based electrolyte to have completely different effects of improving the battery capacity in the energy storage device, and especially have great difference on the influence of the wettability of the gel polymer electrolyte.
In this embodiment, the molar ratio of lithium bis (fluorosulfonyl imide), the 1, 2-dimethoxyethane, and the 1,1,2, 2- tetrafluoroethyl 2,2,3, 3-tetrafluoropropane ether effectively improves the wettability of the Gel Polymer Electrolyte (GPE), effectively increases the conductivity of ions in the electrolyte, and further improves the rate capability of the capacitance of the energy storage device.
In one embodiment, the gel polymer electrolyte membrane includes polyvinyl alcohol-lithium sulfate (PVA-Li)2SO4) And/or polyvinyl alcohol-lithium nitrate (PVA-LiNO)3)。
The gel polymer electrolyte membrane is a membrane layer formed by gel polymer electrolyte, and the gel polymer electrolyte membrane is arranged on the positive plate and the negative plate to serve as electrolyte layers of the energy storage device. The gel polymer electrolyte is a material between a solid electrolyte and a liquid electrolyte, and has the advantages of high conductivity, electrochemical stability, high mechanical strength and high transference number of lithium ions.
The gel polymer electrolyte membrane can adapt to the structures of energy storage devices in different forms, has excellent structural processability, and can improve the design flexibility of the energy storage devices by matching with the structural requirements of the energy storage devices.
The gel polymer electrolyte membrane can be formed by different forming methods, so that the gel polymer electrolyte membrane can present different structural characteristics, the ether-based electrolyte is more easily limited in the structure of the gel polymer electrolyte membrane, the interaction between the gel polymer electrolyte membrane and the ether-based electrolyte is promoted, and the wettability of the gel polymer electrolyte is further improved.
In one embodiment, the gel polymer electrolyte membrane has a thickness of 10 μm to 50 μm.
The gel polymer electrolyte membrane is formed to a thickness of 10 μm to 50 μm by pressing the gel polymer electrolyte to be more easily disposed on the positive and negative electrode sheets. For example, 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 plate and the negative plate to fully participate in reaction, and the gel polymer electrolyte membrane further improves the ionic conductivity of the electrolyte under the action of the ether-based electrolyte. For example, the conductivity of lithium ions in the electrolyte is improved.
In the thickness range of 10-50 μm, the gel polymer electrolyte membrane can effectively exchange ions between the positive plate and the negative plate, and meets the function of the electrolyte in charge-discharge reaction.
In the thickness range, the gel polymer electrolyte membrane does not occupy excessive space, so that the battery cell can be provided with more positive plates and more negative plates under the limited volume.
In one embodiment, 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).
In this embodiment, the negative electrode material includes polypyrrole-lithium vanadate and/or polypyrrole-lithium titanate, and the negative electrode material has better stability. The phenomena of dissolution, deposition and the like of the electrode in the reaction process are reduced, and the damage to the electrode is effectively reduced, so that the electric core is prevented from being pierced or holes are prevented from being formed. The safety problem caused by the short circuit of the positive plate and the negative plate is effectively avoided through the negative electrode material.
For example, a polypyrrole layer is formed on the surface of a lithium vanadate material to obtain a polypyrrole-lithium vanadate material. Or forming a polypyrrole layer on the surface of the lithium titanate material to obtain the polypyrrole-lithium titanate material.
The polypyrrole material forms a conductive coating, so that the stability of the material is improved. The cathode material is more stable in the electrolyte, so that the consumption and damage to the cathode material in the reaction process of the energy storage device are effectively reduced, the short circuit between the anode of the energy storage device and the anode of the isolation layer pierced by dendrites formed by the cathode is reduced, and the safety of the energy storage device is improved.
In one embodiment, the negative electrode material further comprises a conductive agent and a binder, the conductive agent and the binder being mixed together with the polypyrrole-lithium vanadate and/or the polypyrrole-lithium titanate.
In this example, disposing 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 a negative electrode material on a negative electrode current collector. The negative electrode material is slurry, the slurry is coated on a negative current collector, and a negative plate is formed after the slurry needs to be solidified. For example, moisture is evaporated by drying to solidify the slurry on the negative electrode current collector. And the solidified slurry and the negative current collector are solidified to form an integral structure.
For example, a conductive agent, a binder, and 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 bonds the materials within the negative electrode material together more strongly and the slurry bonds with the negative current collector more easily. The conductive agent can improve the conductive effect of the negative plate.
For example, 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.
Alternatively, the conductive agent may be conductive carbon black, acetylene black, carbon nanotubes, or the like. The adhesive may be Styrene Butadiene Rubber (SBR).
In one embodiment, 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 cobaltate, lithium manganate, lithium nickel manganese, lithium nickel cobalt manganese, or lithium rich manganese.
In this example, the positive electrode sheet was formed by coating a positive electrode material on a positive electrode current collector. For example, the positive electrode current collector is an aluminum foil, and lithium cobaltate, lithium manganate, lithium nickel manganese, lithium nickel cobalt manganese, or lithium-rich manganese is coated on the aluminum foil to form a positive electrode sheet. Lithium cobaltate, lithium manganate, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide or rich lithium manganese can effectively provide lithium ions to participate in the reaction as the positive electrode material, so that the consumption of the positive electrode current collector is reduced, the electrical contact between the positive electrode current collector and the positive electrode material is improved, and the capacitance of the energy storage device is ensured.
In one embodiment, the positive electrode material further includes a conductive agent and a binder, and the conductive agent and the binder are mixed with the lithium cobaltate, the lithium manganate, the lithium nickel manganese manganate, the lithium nickel cobalt manganese manganate, or lithium-rich manganese.
In this embodiment, providing the positive electrode material requires mixing a conductive agent and a binder with lithium cobaltate, lithium manganate, lithium nickel cobalt manganate or lithium-rich manganese to form a slurry, and coating the slurry on the surface of the positive electrode current collector to form a positive electrode sheet. Adding lithium cobaltate, lithium manganate, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide or lithium-rich manganese, a conductive agent and a bonding agent into an N-methyl pyrrolidone solvent, and uniformly mixing to form slurry of the cathode material. In the slurry, the conductive agent can improve the conductivity of the positive electrode material. The binder can improve the firmness of the mixed materials, for example, the slurry can bond the materials together after curing. And the adhesive can also form firm adhesion between the positive electrode current collector and the positive electrode material.
Alternatively, the conductive agent may be conductive carbon black, carbon nanotubes, or the like. The binder may be polyvinylidene fluoride (PVDF).
Optionally, a positive electrode material is coated on the positive electrode current collector and cured to form a positive electrode sheet. For example, the negative electrode material is cured by baking, and water is evaporated after curing, so that the negative electrode material is cured on the negative electrode current collector.
For example, the positive electrode material is cured on the positive electrode current collector to form a substrate of the positive electrode sheet, and the substrate of the positive electrode sheet is cut to meet the requirements of different cells on the structure of the positive electrode sheet, so as to prepare the positive electrode sheet with a corresponding structure.
And coating the negative electrode material on a negative electrode current collector and curing to form a negative electrode sheet. For example, the negative electrode material is solidified on the negative electrode current collector to form a substrate of the negative electrode sheet, and the substrate of the negative electrode sheet is cut to meet the requirements of different battery cores on the structure of the negative electrode sheet, so as to prepare the negative electrode sheet with a corresponding structure.
In one embodiment, as shown in fig. 1, the energy storage device includes a plurality of positive electrode sheets, a plurality of negative electrode sheets, and a plurality of gel polymer electrolyte membranes, wherein the positive electrode sheets and the negative electrode sheets are alternately and laminated, and the gel polymer electrolyte membranes are arranged between the adjacent positive electrode sheets and the adjacent negative electrode sheets to form a lamination structure.
The positive plate, the negative plate and the gel polymer electrolyte membrane can be in a wafer structure, a square structure, a rectangular structure or an irregular pattern structure.
In this embodiment, the positive electrode sheet, the negative electrode sheet, and the gel polymer electrolyte membrane are prepared in the same structure, and the laminated 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 of a battery cell with a laminated structure.
For example, the housing 1 forms a containing cavity of the energy storage device, the battery cell 2 is disposed in the containing cavity, and an ether-based electrolyte is added. And sealing the shell 1 to form the energy storage device. The energy storage device is prepared, for example, as a button cell.
For example, the positive electrode sheet, the negative electrode sheet, and the gel polymer electrolyte membrane are prepared as a wafer structure. The diameters of the positive electrode sheet, the negative electrode sheet, and the gel polymer electrolyte membrane of the disk structure are, for example, 14mm, 16mm, 18mm, or 20 mm. The amount of the ether-based electrolyte added is, for example, 0.01mL to 0.03 mL.
In one embodiment, the positive electrode sheet, the negative electrode sheet, and the gel polymer electrolyte membrane are stacked and formed in a wound structure.
In this example, the structure in which the positive electrode sheet, the negative electrode sheet, and the gel polymer electrolyte membrane were laminated was wound to form a cell of a wound structure. In the cell of the winding 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 functions as a separation membrane.
For example, the gel polymer electrolyte membrane of the positive electrode sheet and the negative electrode sheet is cut into sheet structures with the width of 3mm-5mm and the length of 350mm-500mm, and the sheet structures are stacked to form a winding structure.
And (3) placing the battery core with the winding structure into an accommodating cavity of a shell, adding 0.1-0.5mL of ether-based electrolyte and sealing the shell 1. The resulting energy storage device is prepared, for example, as a button cell battery.
First embodiment, as shown in fig. 2 and 3, according to the energy storage device in the above embodiments, the positive electrode material on the positive electrode sheet of the energy storage device includes lithium cobaltate. The negative electrode material on the negative electrode plate comprises polypyrrole-lithium vanadate. The electrolyte is ether-based electrolyte, and gel polymer electrolyte membranes are arranged on the positive plate and the negative plate.
The energy storage device was tested for discharge capacity at 4.4V and 2C,3C,4C,5C rate at room temperature for 180 cycles.
In this example, as shown in fig. 2, the discharge capacity of the energy storage device at a rate of 2C,3C,4C,5C corresponds to 172mAhg-1,167mAhg-1,165mAhg-1,161mAhg-1。
As shown in fig. 3, at 2C current density, the capacity remained stable after 180 cycles with little attenuation.
The energy storage device has higher discharge capacity under different multiplying powers under the action of the gel polymer electrolyte, the ether-based electrolyte, the anode material and the cathode material. Due to the protective layer formed by polypyrrole and the action of the gel polymer electrolyte, the dissolution of lithium vanadate and lithium titanate in the negative electrode material is effectively inhibited, the resistance of charge transfer is reduced, the volume change of the electrode in the circulating process is buffered, and the circulating performance of the energy storage device is further improved.
The discharge capacity of the energy storage device can maintain higher discharge capacity under different multiplying powers, and the energy storage device has better multiplying power performance compared with the energy storage device in the prior art.
In comparison example one, under the conditions of example one, the ether-based electrolyte is replaced by a lithium ion electrolyte used in the existing energy storage device. Under the condition of room temperature, the energy storage device is subjected to discharge capacity test under the multiplying power of 2C,3C,4C and 5C at the voltage of 4.4V, the cycle lasts for 180 weeks, and the discharge capacity is 170mAhg-1,160mAhg-1,152mAhg-1,140mAhg-1The capacity retention at 180 weeks of cycling was 85%.
By contrast, the ether-based electrolyte disclosed by the disclosure can effectively improve the retention rate of discharge capacity. The discharge capacity can be kept stable under the condition of multiple cycles. The ether-based electrolyte has obvious effect on gel polymer electrolyte, improves the wettability and the conductivity, thereby improving the performances under different multiplying powers.
In a second embodiment, the positive electrode material on the positive electrode sheet of the energy storage device comprises lithium manganate. The negative electrode material on the negative electrode plate comprises polypyrrole-lithium vanadate. The electrolyte is ether-based electrolyte, and gel polymer electrolyte membranes are arranged on the positive plate and the negative plate.
The energy storage device was tested for discharge capacity at 4.2V and 2C,3C,4C,5C rate at room temperature for 180 cycles.
In this example, the discharge capacity of the energy storage device corresponds to 125mAhg corresponding to a magnification of 2C,3C,4C,5C-1,123mAhg-1,122mAhg-1,120mAhg-1。
In a third embodiment, the positive electrode material on the positive electrode sheet of the energy storage device comprises a high nickel ternary. The negative electrode material on the negative electrode plate comprises polypyrrole-lithium vanadate. The electrolyte is ether-based electrolyte, and gel polymer electrolyte membranes are arranged on the positive plate and the negative plate.
The energy storage device was tested for discharge capacity at 4.3V and 2C,3C,4C,5C rate at room temperature for 180 cycles.
In this embodiment, the magnification ratio corresponding to 2C,3C,4C,5C,the discharge capacity of the energy storage device corresponds to 180mAhg-1,177mAhg-1,175mAhg-1,174mAhg-1。
In the above-described embodiments, the energy storage device can maintain discharge capacity without loss under various angles of bending, pressing, and folding by the action of the gel polymer electrolyte membrane, and has excellent flexibility. The stability of the energy storage device can not be damaged under the condition of perforation, so that the energy storage device has excellent safety performance.
In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. An energy storage device is characterized by comprising a positive plate, a negative plate, a gel polymer electrolyte membrane and an ether-based electrolyte;
the gel polymer electrolyte membrane is arranged between the positive plate and the negative plate, and the ether-based electrolyte is filled between the positive plate, the negative plate and the gel polymer electrolyte membrane;
the ether-based electrolyte comprises the following components: lithium bis (fluorosulfonyl) imide, 1, 2-dimethoxyethane, and 1,1,2, 2-tetrafluoroethyl 2,2,3, 3-tetrafluoropropane ether.
2. The energy storage device according to claim 1, wherein a molar ratio of the lithium bis-fluorosulfonylimide, the 1, 2-dimethoxyethane, and the 1,1,2, 2-tetrafluoroethyl 2,2,3, 3-tetrafluoropropane ether is 0.5-1.5:0.5-1.5: 3.
3. The energy storage device according to claim 1, wherein the gel polymer electrolyte membrane comprises polyvinyl alcohol-lithium sulfate and/or polyvinyl alcohol-lithium nitrate.
4. The energy storage device according to claim 1, wherein the gel polymer electrolyte membrane has a thickness of 10 μm to 50 μm.
5. The energy storage device according to claim 1, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode material coated on the negative electrode current collector, and the negative electrode material comprises polypyrrole-lithium vanadate and/or polypyrrole-lithium titanate.
6. The energy storage device according to claim 5, wherein the negative electrode material further comprises a conductive agent and a binder, and the conductive agent and the binder are mixed together with the polypyrrole-lithium vanadate and/or the polypyrrole-lithium titanate.
7. The energy storage device according to claim 1, wherein 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 cobaltate, lithium manganate, lithium nickel cobalt manganate, or lithium-rich manganese.
8. The energy storage device according to claim 7, wherein the positive electrode material further comprises a conductive agent and a binder, and the conductive agent and the binder are mixed together with the lithium cobaltate, the lithium manganate, the lithium nickel cobalt manganate, or lithium-rich manganese.
9. The energy storage device according to claim 1, comprising a plurality of the positive electrode sheets, a plurality of the negative electrode sheets, and a plurality of gel polymer electrolyte membranes, wherein the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately and laminated, and the gel polymer electrolyte membranes are arranged between the adjacent positive electrode sheets and the adjacent negative electrode sheets to form a laminated structure.
10. The energy storage device according to claim 1, wherein the positive electrode sheet, the negative electrode sheet, and the gel polymer electrolyte membrane are stacked and form a wound structure.
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| CN202011639493.5A CN112713301B (en) | 2020-12-31 | 2020-12-31 | Energy storage device |
| PCT/CN2021/139718 WO2022143262A1 (en) | 2020-12-31 | 2021-12-20 | Energy storage device |
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