WO2021023265A1 - 一种电解液及其制备方法和锂离子电池 - Google Patents
一种电解液及其制备方法和锂离子电池 Download PDFInfo
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- WO2021023265A1 WO2021023265A1 PCT/CN2020/107415 CN2020107415W WO2021023265A1 WO 2021023265 A1 WO2021023265 A1 WO 2021023265A1 CN 2020107415 W CN2020107415 W CN 2020107415W WO 2021023265 A1 WO2021023265 A1 WO 2021023265A1
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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
- H01M10/0567—Liquid materials characterised by the additives
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D327/00—Heterocyclic compounds containing rings having oxygen and sulfur atoms as the only ring hetero atoms
- C07D327/10—Heterocyclic compounds containing rings having oxygen and sulfur atoms as the only ring hetero atoms two oxygen atoms and one sulfur atom, e.g. cyclic sulfates
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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
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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
- H01M10/0566—Liquid materials
- H01M10/0568—Liquid materials characterised by the solutes
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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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- 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
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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
Definitions
- the application relates to an electrolyte, a preparation method thereof, and a lithium ion battery, and belongs to the technical field of lithium ion batteries.
- the current composition of lithium-ion batteries mainly includes a positive electrode, a negative electrode, a separator and an electrolyte.
- the electrode material and the electrolyte will react on the surface of the electrode material to form a passivation layer covering the surface of the electrode material, which is often mentioned in the art as having the characteristics of a solid electrolyte
- the interface film solid electronic interface, referred to as SEI film.
- the SEI film has a very important influence on the performance of lithium ion batteries.
- the SEI film can prevent further contact between the electrolyte and the electrode material, and inhibit side reactions of the electrolyte on the surface of the electrode material, which is beneficial to the improvement of the cycle performance of the lithium ion battery; on the other hand, the generation of the SEI film will also consume the electrolysis Part of the lithium ions in the liquid reduces the capacity of the lithium ion battery.
- the present application provides an electrolyte, which can be used in a lithium ion battery to significantly improve the performance of the SEI film, thereby helping to improve the cycle performance and storage performance of the lithium ion battery.
- the present application also provides a method for preparing an electrolyte, which is simple and easy to implement, and helps to safely and efficiently prepare an electrolyte that can improve the cycle performance and storage performance of the lithium ion battery.
- the present application also provides a lithium ion battery containing the above electrolyte, so the lithium ion battery has excellent cycle performance and storage performance.
- This application provides an electrolyte, which comprises the following components according to mass fraction: 10-20% of lithium salt and 0.2-7% of additive composition, the balance being solvent;
- the additive composition includes a boron-containing lithium salt compound and a sulfur compound of formula 1,
- R 1 and R 3 are each independently selected from hydrogen, halogen, substituted or unsubstituted alkyl
- R 2 is selected from substituted or unsubstituted alkylene groups or directly bonded;
- the mass fraction of the boron-containing lithium salt compound in the electrolyte is at least 0.1%.
- the sulfur compound is specifically selected from at least one of the compounds represented by T1-T4:
- the boron-containing lithium salt compound is selected from at least one of lithium bisfluorooxalate borate, lithium bisoxalate borate and lithium tetrafluoroborate.
- the solvent includes at least one of ethylene carbonate and propylene carbonate.
- This application also provides a method for preparing any one of the foregoing electrolytes, including:
- the solvent, the lithium salt and the additive composition are mixed to obtain the electrolyte.
- the application also provides a lithium ion battery, the electrolyte of the lithium ion battery is any one of the foregoing electrolytes.
- the electrolyte provided by this application by adding a specific additive composition, can form a stable and firm SEI film on the surface of the electrode in preference to other components in the electrolyte, thereby effectively preventing the electrolyte from contacting the electrode and significantly improving lithium ion Cycle performance and storage performance of the battery;
- the preparation method of the electrolyte provided in this application has simple process and strong operability, which is convenient for practical promotion and large-scale application;
- the lithium ion battery provided by this application includes the aforementioned electrolyte, the lithium ion battery has excellent cycle performance and storage performance.
- This application provides an electrolyte, which comprises the following components according to mass fraction: 10-20% of lithium salt and 0.2-7% of additive composition, the balance being solvent;
- the additive composition includes a boron-containing lithium salt compound and the sulfur compound described in Formula 1,
- R 1 and R 3 are each independently selected from hydrogen, halogen, substituted or unsubstituted alkyl
- R 2 is selected from substituted or unsubstituted alkylene groups or directly bonded;
- the mass fraction of the boron-containing lithium salt compound in the electrolyte is at least 0.1%.
- the additive composition of the present application is a combination of a boron-containing lithium salt compound and the sulfur compound described in Formula 1.
- the mass fraction of the additive composition in the electrolyte is 0.2-7%, and when the boron-containing lithium salt compound is in the When the mass fraction in the electrolyte is at least 0.1%, the performance of the SEI film formed on the electrode surface of the lithium ion battery during the first charge and discharge can be significantly improved, which can have a positive impact on the cycle performance and storage performance of the lithium ion battery.
- the inventor analyzed the SEI film and believed that it may be that the additive composition can electrochemically react at a lower potential, which is superior to other components in the electrolyte to form a boron and sulfur element on the electrode surface.
- the boron element is beneficial to reduce the mass transfer resistance of lithium ions
- the sulfur element in the form of a polymer in the SEI film is beneficial to improve the strength of the SEI film.
- lithium ions can pass through the SEI film with low resistance to complete the intercalation and deintercalation on the electrode, which is beneficial to improve the stability of intercalation and deintercalation of lithium and the dynamics of the electrode electrolyte interface. , Thereby significantly improving the performance of lithium-ion batteries, such as cycle life, self-discharge, rated rate, and battery temperature resistance.
- the increase in the strength of the SEI film can prevent the SEI film from dissolving in the electrolyte, avoid the damage to the electrode material caused by the co-embedding of solvent molecules, and ensure the electrode's insulation performance against other particles or electrons, thereby further improving the electrode cycle Performance and storage performance.
- R 1 and R 3 may be substituted or unsubstituted C 1 -C 5 linear alkyl groups, C 3 -C 5 branched chain alkyl groups, or C 3 -C 5 cycloalkyl groups, R 1 and R 3 can specifically be -CH 3 , -CH 2 CH 3 , -C(CH 3 ) 3 , -C(CH 3 ) 2 F, -CH 2 F, -CH 2 (C 6 H 6 ),- One of CH(C 6 H 6 )CH 2 CH 3 , -CH 2 CH 2 CH 2 CH 2 CH 3 , -CH 2 C(CH 3 ) 3 ; R 2 is selected from substituted or unsubstituted C 1- C 10 alkylene group, direct bond, R 2 can specifically be -CH 2 -, -CHF-, -CH 2 CHFCH 2 -, -CH 2 CH 2 -, -CH 2 CHFCH 2 -, -CH 2 C One of (CH 3 ) 2 CH
- the sulfur compound represented by Formula 1 of the present application can be obtained commercially or by any feasible preparation method.
- the mass fraction of the sulfur compound described in Formula 1 in the electrolyte can be controlled to be 0.1-5%.
- the use of different lithium salts and/or solvents in the electrolyte, or even the use of different positive electrode materials, negative electrode materials or separators, will have an impact on the final performance of the lithium ion battery. Therefore, roughly speaking, when the mass fraction of sulfur compounds in the electrolyte is controlled at 0.1%-2%, the lithium ion battery can basically have excellent performance.
- the mass fraction of the boron-containing lithium salt compound in the electrolyte is 0.1-2%, the compatibility with sulfur compounds is higher, which helps to further improve the cycle performance and storage performance of the lithium ion battery.
- sulfur compound of the present application is specifically selected from at least one of the compounds represented by T1-T4:
- the boron-containing lithium salt compound of the present application is selected from at least one of lithium bisfluorooxalate borate (LiODFB), lithium bisoxalate borate (LiBOB), and lithium tetrafluoroborate (LiBF 4 ).
- LiODFB lithium bisfluorooxalate borate
- LiBOB lithium bisoxalate borate
- LiBF 4 lithium tetrafluoroborate
- the boron-containing lithium salt compound is two or more of the above compounds, the application does not particularly limit the ratio between the compounds.
- ethylene carbonate and propylene carbonate may assist the above additive composition to form SEI film on the electrode surface, which can accelerate the formation of SEI film by the additive composition prior to other components on the electrode surface, thereby increasing the sulfur in the SEI film.
- the content of element and boron may assist the above additive composition to form SEI film on the electrode surface, which can accelerate the formation of SEI film by the additive composition prior to other components on the electrode surface, thereby increasing the sulfur in the SEI film.
- the performance of the lithium ion battery can be further optimized.
- the solvent includes one of ethylene carbonate or propylene carbonate
- the mass fraction of ethylene carbonate or propylene carbonate in the electrolyte can be 10-50%
- the solvent includes ethylene carbonate and carbonic acid Propylene ester
- the total mass fraction of ethylene carbonate and propylene carbonate in the electrolyte can be 10-50%.
- the electrolyte of the present application may also include one or more of other solvents commonly used in current lithium-ion battery electrolytes, such as: butylene carbonate, fluorocarbon Ethylene carbonate (FEC), dimethyl carbonate (DMC), diethyl carbonate (DEC), difluoroethylene carbonate (DFEC), dipropyl carbonate, ethyl methyl carbonate (EMC), ethyl acetate, Ethyl propionate, propyl acetate, propyl propionate, sulfolane, ⁇ -butyrolactone, etc.
- FEC fluorocarbon Ethylene carbonate
- DMC dimethyl carbonate
- DEC diethyl carbonate
- DFEC difluoroethylene carbonate
- EMC ethyl methyl carbonate
- EMC ethyl methyl carbonate
- EMC ethyl methyl carbonate
- EMC ethyl methyl carbonate
- This application does not specifically limit the lithium salt in the electrolyte. It can be the electrolyte lithium salt commonly used in the current lithium ion electrolyte.
- lithium hexafluorophosphate (LiPF 6 ) and lithium bis(fluorosulfonyl)imide (LiFSI) can be selected.
- LiFSI lithium bis(fluorosulfonyl)imide
- LiTFSI lithium bis(trifluoromethanesulfonate) imide
- the application does not particularly limit the ratio between the compounds.
- This application also provides a method for preparing any one of the above-mentioned electrolytes, including: mixing a solvent, a lithium salt, and an additive composition under an inert atmosphere to obtain the electrolyte.
- lithium salt and additive composition can be added to the solvent, and after stirring, the electrolyte solution of the present application can be obtained.
- the present application does not limit the order of adding the lithium salt and the additive composition, and the sulfur compound and the boron-containing lithium salt compound in the additive composition may be added together or separately before and after.
- the preparation method of the electrolyte of the present application is easy to operate, and only needs to mix raw materials and stir to complete, so the preparation of the electrolyte can be completed with high efficiency and low cost.
- the application also provides a lithium ion battery, the electrolyte of which is any one of the foregoing electrolytes.
- the lithium ion battery of the present application also includes a positive electrode, a negative electrode, and a separator.
- This application does not strictly limit the active material of the positive electrode. It can be the positive electrode active material commonly used in current lithium ion batteries, such as lithium cobaltate, lithium nickelate, lithium manganate, lithium manganate, nickel cobalt manganese ternary material, nickel At least one of cobalt-aluminum ternary materials, lithium iron phosphate (LFP), lithium nickel manganese oxide, lithium-rich manganese-based materials, and the like.
- the positive electrode active material commonly used in current lithium ion batteries, such as lithium cobaltate, lithium nickelate, lithium manganate, lithium manganate, nickel cobalt manganese ternary material, nickel At least one of cobalt-aluminum ternary materials, lithium iron phosphate (LFP), lithium nickel manganese oxide, lithium-rich manganese-based materials, and the like.
- the at least one positive electrode active material mentioned above, conductive carbon black, conductive graphite, and binder polyvinylidene fluoride can be dispersed in an appropriate amount of N-methylpyrrolidone at a mass ratio of 96:1:1:2.
- NMP N-methylpyrrolidone
- the present application does not strictly limit the active material of the negative electrode, and it may be the negative active material commonly used in current lithium ion batteries, such as at least one of artificial graphite, hard carbon, and soft carbon.
- the above-mentioned at least one negative electrode active material can be combined with conductive carbon black, binder styrene butadiene rubber (SBR) and thickener sodium carboxymethyl cellulose (CMC) at a mass ratio of 96:1:1.5: 1.5 Disperse in an appropriate amount of deionized water solvent, fully stir and mix to form a uniform negative electrode slurry; uniformly coat the negative electrode slurry on the copper foil of the negative electrode current collector, and obtain a negative electrode sheet after drying, rolling and slitting.
- SBR binder styrene butadiene rubber
- CMC thickener sodium carboxymethyl cellulose
- This application does not strictly limit the material selection of the separator. It can be the separator material commonly used in lithium ion batteries, such as polypropylene separator (PP), polyethylene separator (PE), polypropylene/polyethylene double-layer composite film ( PP/PE), polyimide electrospinning membrane (PI), polypropylene/polyethylene/polypropylene three-layer composite membrane (PP/PE/PP), cellulose non-woven membrane, ceramic-coated membrane One of them.
- PP polypropylene separator
- PE polyethylene separator
- PP/PE polypropylene/polyethylene double-layer composite film
- PI polyimide electrospinning membrane
- PP/PE/PP polypropylene/polyethylene/polypropylene three-layer composite membrane
- cellulose non-woven membrane ceramic-coated membrane One of them.
- the positive electrode sheet, the separator and the negative electrode sheet are wound to obtain a bare cell, and the cell is packaged in a pre-punched aluminum plastic film bag. After the packaged battery is dried with moisture at 85°C, the electrolyte of the present application is injected into the dry battery, and the lithium ion battery is prepared after the battery is placed, formed, and sealed again.
- the lithium ion battery of the present application includes the aforementioned electrolyte, it can form an SEI film with excellent performance on the electrode surface during the first charge and discharge, so that the lithium ion battery of the present application has excellent cycle performance and storage performance.
- the mass fraction of the solvent in the electrolyte is 84.5%, wherein the mass fraction of ethylene carbonate and propylene carbonate in the electrolyte is 25.35%, and the mass fraction of LiPF 6 in the electrolyte is 13.5%;
- the sulfur compound shown in T1 accounts for 1% of the mass fraction of the electrolyte, and LiODFB accounts for 1% of the mass fraction of the electrolyte.
- Example 1 The electrolyte in Example 1 is combined with lithium cobalt oxide positive electrode sheet, separator and artificial graphite negative electrode to assemble lithium ion battery 1#.
- the preparation method of the electrolyte of this embodiment is the same as that of embodiment 1, except that the sulfur compound represented by T1 in the electrolyte of this embodiment accounts for 0.2% of the mass fraction of the electrolyte, and the solvent accounts for the mass fraction of the electrolyte. It is 85.3%, the mass fraction of LiPF 6 in the electrolyte is 13.5%, and the mass fraction of LiODFB in the electrolyte is 1.0%.
- Example 2 The electrolyte in Example 2 is combined with lithium cobalt oxide positive electrode sheet, separator and artificial graphite negative electrode to assemble lithium ion battery 2#.
- the preparation method of the electrolyte of this embodiment is the same as that of embodiment 1, except that the sulfur compound in the electrolyte of this embodiment is the sulfur compound shown in T2 and accounts for 0.5% of the mass fraction of the electrolyte.
- the boron lithium salt compound is LiBOB, and the mass fraction of LiBOB in the electrolyte is 1%, the mass fraction of the solvent in the electrolyte is 85%, and the mass fraction of LiPF 6 in the electrolyte is 13.5%.
- Example 3 The electrolyte in Example 3 is combined with a lithium cobalt oxide positive electrode sheet, a separator and an artificial graphite negative electrode to assemble a lithium ion battery 3#.
- the preparation method of the electrolyte of this embodiment is the same as that of embodiment 1, except that the sulfur compound in the electrolyte of this embodiment is a sulfur compound shown in T3 and accounts for 2% of the mass fraction of the electrolyte.
- the boron lithium salt compound is LiBF 4, and the mass fraction of LiBF 4 in the electrolyte is 0.5%, the mass fraction of the solvent in the electrolyte is 84%, and the mass fraction of LiPF 6 in the electrolyte is 13.5%.
- Example 4 The electrolyte in Example 4 was combined with lithium cobalt oxide positive electrode sheet, separator and artificial graphite negative electrode to assemble lithium ion battery 4#.
- the preparation method of the electrolyte of this embodiment is the same as that of embodiment 1, except that the lithium salt compound containing boron in the electrolyte of this embodiment is LiBF 4 and the mass fraction of LiBF 4 in the electrolyte is 2%, as shown by T1
- the mass fraction of sulfur compounds in the electrolyte is 1%, the mass fraction of the solvent in the electrolyte is 83.5%, and the mass fraction of LiPF 6 in the electrolyte is 13.5%.
- Example 5 The electrolyte in Example 5 was combined with a lithium cobalt oxide positive electrode sheet, a separator and an artificial graphite negative electrode to assemble a lithium ion battery 5#.
- the preparation method of the electrolyte of this embodiment is the same as that of embodiment 1, except that the sulfur compound represented by T1 in the electrolyte of this embodiment accounts for 2% of the mass fraction of the electrolyte, and LiODFB accounts for the mass fraction of the electrolyte. It is 1%, the mass fraction of the solvent in the electrolyte is 83.5%, and the mass fraction of LiPF 6 in the electrolyte is 13.5%.
- Example 6 The electrolyte in Example 6 was combined with lithium cobalt oxide positive electrode sheet, separator and artificial graphite negative electrode to assemble lithium ion battery 6#.
- the preparation method of the electrolyte of this example is the same as that of Example 1, except that the sulfur compound shown in T1 in the electrolyte of this example accounts for 4% of the mass fraction of the electrolyte, and LiODFB accounts for the mass fraction of the electrolyte. It is 1%, the mass fraction of the solvent in the electrolyte is 81.5%, and the mass fraction of LiPF 6 in the electrolyte is 13.5%.
- Example 7 The electrolyte in Example 7 was combined with lithium cobalt oxide positive electrode sheet, separator and artificial graphite negative electrode to assemble lithium ion battery 7#.
- the preparation method of the electrolyte of this embodiment is the same as that of embodiment 1, the only difference is that the mass fraction of LiODFB in the electrolyte of this embodiment is 2.5%, and the sulfur compound shown in T1 accounts for the mass fraction of the electrolyte. It is 1%, the mass fraction of the solvent in the electrolyte is 83%, and the mass fraction of LiPF 6 in the electrolyte is 13.5%.
- Example 8 The electrolyte in Example 8 was combined with lithium cobalt oxide positive electrode sheet, separator and artificial graphite negative electrode to assemble lithium ion battery 8#.
- Example 9 The electrolyte in Example 9 was combined with a lithium cobalt oxide positive electrode sheet, a separator and an artificial graphite negative electrode to assemble a lithium ion battery 9#.
- the preparation method of the electrolyte of this example is the same as that of example 1, except that in the electrolyte of this example, the solvent contains ethylene carbonate (EC), propylene carbonate (PC), and diethyl carbonate (DEC).
- EC ethylene carbonate
- PC propylene carbonate
- DEC diethyl carbonate
- PP propyl propionate
- ethylene carbonate and propylene carbonate account for 8.45% of the electrolyte.
- Example 10 The electrolyte in Example 10 was combined with a lithium cobalt oxide positive electrode sheet, a separator and an artificial graphite negative electrode to assemble a lithium ion battery 10#.
- the preparation method of the electrolyte of this example is the same as that of example 1, except that in the electrolyte of this example, the solvent contains ethylene carbonate (EC), propylene carbonate (PC), and diethyl carbonate (DEC).
- EC ethylene carbonate
- PC propylene carbonate
- DEC diethyl carbonate
- PP propyl propionate
- PP mass fraction of the solvent in the electrolyte
- Example 11 The electrolyte in Example 11 was combined with a lithium cobalt oxide positive electrode sheet, a separator and an artificial graphite negative electrode to assemble a lithium ion battery 11#.
- the preparation method of the electrolyte of this example is the same as that of example 1, except that the lithium salt in the electrolyte of this example is LiPF 6 and LiTFSI, and the mass fractions of LiPF 6 and LiTFSI in the electrolyte are 10% and 10% respectively.
- the sulfur compound shown by T1 accounts for 0.5% of the mass fraction of the electrolyte
- the boron-containing lithium salt compound is LiBOB
- the mass fraction of LiBOB accounts for 1% of the electrolyte.
- Example 12 The electrolyte in Example 12 is combined with lithium cobalt oxide positive electrode sheet, separator and artificial graphite negative electrode to assemble lithium ion battery 12#.
- the preparation method of the electrolyte of this example is the same as that of example 1, except that the lithium salt in the electrolyte of this example is LiPF 6 and LiFSI, and the mass fractions of LiPF 6 and LiFSI in the electrolyte are 10% and 10% respectively. 5%, the sulfur compound shown in T1 accounts for 1% of the electrolyte, and LiODFB accounts for 1% of the electrolyte.
- Example 13 The electrolyte in Example 13 is combined with lithium cobalt oxide positive electrode sheet, separator and artificial graphite negative electrode to assemble lithium ion battery 13#.
- the preparation method of the electrolyte of this comparative example is the same as that of Example 1. The only difference is that the additive in the electrolyte of this comparative example is only the compound shown in T1, and the compound shown in T1 accounts for 1% of the mass fraction of the electrolyte.
- the mass fraction of the solvent in the electrolyte is 85.5%, and the mass fraction of LiPF 6 in the electrolyte is 13.5%.
- the electrolyte in Comparative Example 1 was combined with a lithium cobalt oxide positive electrode sheet, a separator and an artificial graphite negative electrode to assemble a lithium ion battery 14#.
- the preparation method of the electrolyte of this comparative example is the same as that of Example 1. The only difference is that the additive in the electrolyte of this comparative example is only LiODFB, and the mass fraction of LiODFB in the electrolyte is 1%, and the mass fraction of the solvent in the electrolyte is 85.5%, and the mass fraction of LiPF 6 in the electrolyte is 13.5%.
- the electrolyte in Comparative Example 2 was combined with a lithium cobalt oxide positive electrode sheet, a separator and an artificial graphite negative electrode to assemble a lithium ion battery 15#.
- the preparation method of the electrolyte of this comparative example is the same as that of Example 1. The only difference is that LiODFB in the electrolyte of this comparative example accounts for 0.01% of the mass fraction of the electrolyte, and the sulfur compound shown in T1 accounts for the mass fraction of the electrolyte. It is 1%, the mass fraction of the solvent in the electrolyte is 85.49%, and the mass fraction of LiPF 6 in the electrolyte is 13.5%.
- the electrolyte in Comparative Example 3 was combined with a lithium cobalt oxide positive electrode sheet, a separator and an artificial graphite negative electrode to assemble a lithium ion battery 16#.
- the lithium ion battery 1-16# was tested at room temperature with a charge-discharge rate of 0.5C for 3 cycles of charge and discharge, and then charged to a full charge at a rate of 0.5C, and the highest discharge capacity Q and the first 3 cycles of 0.5C were recorded respectively Battery thickness T.
- Battery thickness T Store the fully charged battery at 60°C for 30 days, record the battery thickness T0 and 0.5C discharge capacity Q1 after 30 days, then charge and discharge the battery 3 times at a rate of 0.5C at room temperature, and record the highest of the 3 cycles Discharge capacity Q2, calculate the thickness change rate, capacity retention rate and capacity recovery rate of the battery during high temperature storage. The results are shown in Table 1.
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Abstract
Description
Claims (10)
- 根据权利要求1所述的电解液,其中,所述硫类化合物在所述电解液中的质量分数为0.1-5%。
- 根据权利要求1所述的电解液,其中,所述硫类合物在所述电解液中的质量分数为0.1-2%。
- 根据权利要求1-3任一所述的电解液,其中,所述含硼锂盐化合物在所述电解液中的质量分数为0.1-2%。
- 根据权利要求1-4任一所述的电解液,其中,所述含硼锂盐化合物 选自双氟草酸硼酸锂、双草酸硼酸锂和四氟硼酸锂中的至少一种。
- 根据权利要求1-4任一所述的电解液,其中,所述溶剂至少包括碳酸乙烯酯和碳酸丙烯酯中的一种。
- 根据权利要求7所述的电解液,其中,所述碳酸乙烯酯和/或碳酸丙烯酯在所述电解液中的质量分数为10-50%。
- 一种权利要求1-8任一项所述电解液的制备方法,其中,包括:在惰性气氛下,将溶剂、锂盐以及添加剂组合物混合,得到所述电解液。
- 一种锂离子电池,其中,所述锂离子电池的电解液为权利要求1-8任一项所述的电解液。
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