An electrolyte and its application

Abstract

The present invention provides an electrolyte and its application, wherein the electrolyte comprises an electrolyte additive, wherein the electrolyte additive comprises a phosphonosulfone compound. The electrolyte has excellent interface stability with the positive electrode, can prevent the electrolyte from being oxidized to cause battery bloating, improve the cycle performance of the battery, and can inhibit the dissolution of transition metals in the positive electrode material, further improving the cycle performance of the battery.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to an electrolyte and its application. Background Art

[0002] Lithium-ion batteries are widely used in 3C electronic products and new energy vehicles due to their high specific energy and long cycle life. With the rapid development of the new energy vehicle industry, consumers have higher and higher demands for the range of new energy vehicles, so it is necessary to continuously improve the energy density of batteries to meet consumers' long-range demands.

[0003] At present, the energy density of batteries is mainly increased by developing high-voltage positive electrode materials. However, under high voltage, the side reactions between the electrolyte and the positive electrode material are intensified, making the electrolyte easily oxidized and causing battery flatulence; and, the transition metal ions in the positive electrode material are easily dissolved and migrate to the negative electrode side through the electrolyte, destroying the solid electrolyte interface protective film (SEI film) on the negative electrode surface, thereby causing the capacity of the lithium-ion battery to decay sharply. Summary of the invention

[0004] The present invention provides an electrolyte having excellent interface stability with a positive electrode, which can prevent the electrolyte from being oxidized and causing battery bloating, thereby improving the cycle performance of the battery, and can inhibit the dissolution of transition metals in the positive electrode material, thereby further improving the cycle performance of the battery.

[0005] The battery of the present invention, because it includes the above-mentioned electrolyte, has excellent cycle performance.

[0006] The present invention provides an electronic device, comprising the above-mentioned battery, so the electronic device has excellent battery life and broad market application prospects.

[0007] The present invention provides an electrolyte, wherein the electrolyte comprises an electrolyte additive, and the electrolyte additive comprises a phosphonyl sultone compound.

[0008] The electrolyte as described above, wherein the phosphonosulfonate compound includes a compound represented by Formula 1 or Formula 2;

[0009] Formula 1;

[0010] Formula 2;

[0011] Wherein, a, b, c, and d are each independently 0 or 1;

[0012] R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, and R14 are each independently selected from hydrogen, halogen, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C2-C30 alkynyl, or substituted or unsubstituted C6-C60 aryl.

[0013] The electrolyte as described above, wherein R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, and R14 are each independently selected from hydrogen, halogen, substituted or unsubstituted C1-C5 alkyl, substituted or unsubstituted C2-C5 alkenyl, substituted or unsubstituted C2-C5 alkynyl, or substituted or unsubstituted C6-C10 aryl.

[0014] The electrolyte as described above, wherein the phosphonosulfonate lactone compound includes the compound shown below;

[0015] , , ,

[0016] , , .

[0017] The electrolyte as described above, wherein the mass percentage of the phosphonosulfone compound in the electrolyte is 0.1% to 20%.

[0018] The electrolyte as described above, wherein the electrolyte further includes a negative electrode film-forming agent, and the negative electrode film-forming agent is selected from at least one of vinylene carbonate, fluoroethylene carbonate, vinyl ethylene carbonate, 1,3-propane sultone, 1,3-propylene sultone, vinyl sulfate, lithium difluorophosphate, lithium difluorobisoxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0019] The electrolyte as described above, wherein the mass percentage of the negative electrode film-forming agent in the electrolyte is 0.1-3%.

[0020] The electrolyte as described above, wherein the electrolyte further comprises a lithium salt, and the lithium salt comprises lithium hexafluorophosphate and / or lithium bis(fluorosulfonyl)imide.

[0021] The electrolyte as described above, wherein the concentration of lithium salt in the electrolyte is 0.5-2 mol / L.

[0022] The present invention provides a battery, wherein the battery comprises the electrolyte as described above.

[0023] The present invention provides an electronic device, wherein a driving source or an energy storage source of the electronic device is the battery as described above.

[0024] The electrolyte of the present invention includes an electrolyte additive, and the electrolyte additive includes a phosphonosulfone compound. Since the oxidation potential of the phosphonosulfone compound is low, it can be preferentially oxidized and decomposed on the surface of the positive electrode to form a complete, dense and uniform passivation film (CEI), thereby improving the interfacial stability between the positive electrode and the electrolyte. In addition, the phosphonosulfone compound will decompose in the first cycle of the battery to form a sulfate compound to modify the negative electrode solid electrolyte interface protective film (SEI). Therefore, the electrolyte of the present invention can form a stable protective film at the interface of the positive electrode and the negative electrode, respectively, to protect the positive electrode and the negative electrode from being destroyed under high temperature and high pressure, thereby improving the cycle performance and storage performance of the battery under high temperature and high pressure.

[0025] The battery of the present invention, because it includes the above-mentioned electrolyte, has excellent cycle performance and storage performance under high temperature and high pressure, and is suitable for wide promotion and application.

[0026] The electronic device of the present invention has excellent battery life because its driving source or energy storage source is the above-mentioned battery, and is suitable for wide promotion and application. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] A first aspect of the present invention provides an electrolyte, the electrolyte comprising an electrolyte additive, and the electrolyte additive comprises a phosphonyl sultone compound.

[0029] In the present invention, the phosphonosulfone compound includes at least a phosphono group and a cyclic sulfonate group. The phosphonosulfone compound can be prepared by a method commonly used in the art, or can be obtained by commercial purchase. In practical applications, other electrolyte additives can be added to the electrolyte according to actual needs.

[0030] The electrolyte of the present invention includes phosphonosulfone compounds. Since the oxidation potential of phosphonosulfone compounds is relatively low, they can be preferentially oxidized and decomposed on the surface of the positive electrode to form a complete, dense and uniform passivation film (CEI), improve the interfacial stability between the positive electrode and the electrolyte, and can not only reduce the contact between the electrolyte and the positive electrode material, inhibit the dissolution of transition metal ions in the positive electrode material, avoid the catalytic decomposition of transition metal ions on the electrolyte, effectively inhibit the further oxidation and decomposition of the electrolyte under high voltage, and inhibit the flatulence of the lithium ion battery; and can effectively inhibit the increase of the interface impedance at the positive electrode during the cycle and storage process, and improve the cycle life and storage performance of the lithium ion battery. In addition, the phosphonosulfone compounds will decompose in the first cycle of the battery to form sulfate compounds, modify the negative electrode solid electrolyte interface protection film (SEI), and can better inhibit the generation of gas on the negative electrode surface, especially inhibit the generation of gas on the negative electrode surface at high temperature. Therefore, the electrolyte of the present invention can improve the cycle performance and storage performance of the battery under high temperature and high pressure.

[0031] Further, the phosphonosulfone compound includes a compound represented by Formula 1 or Formula 2;

[0032] Formula 1;

[0033] Formula 2;

[0034] Wherein, a, b, c, and d are each independently 0 or 1;

[0035] R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, and R14 are each independently selected from hydrogen, halogen, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C2-C30 alkynyl, or substituted or unsubstituted C6-C60 aryl.

[0036] In the present invention, a, b, c, and d are the numbers of O atoms, respectively, wherein a can be 0 or 1, b can be 0 or 1, c can be 0 or 1, and d can be 0 or 1, and a, b, c, and d are independent of each other.

[0037] R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, and R14 are each independently selected from hydrogen, halogen (e.g., F, Cl, Br, I), substituted or unsubstituted C1-C30 alkyl (-C n H 2n-1, n is a positive integer from 1 to 30, and the alkyl group may be a substituted straight-chain alkyl group, a substituted branched-chain alkyl group, a substituted cycloalkyl group, an unsubstituted straight-chain alkyl group, an unsubstituted branched-chain alkyl group, an unsubstituted cycloalkyl group), a substituted or unsubstituted C2-C30 alkenyl group (for example, a substituted straight-chain alkenyl group, a substituted branched-chain alkenyl group, an unsubstituted cyclic alkenyl group (for example, a cyclopentadiene group containing or not containing heteroatoms), an unsubstituted straight-chain alkenyl group, an unsubstituted branched-chain alkenyl group, a substituted cyclic alkenyl group), a substituted or unsubstituted C2-C30 alkynyl group (for example, a substituted straight-chain alkynyl group, a substituted branched-chain alkynyl group, a substituted cyclic alkynyl group, an unsubstituted straight-chain alkynyl group, an unsubstituted branched-chain alkynyl group, an unsubstituted cyclic alkynyl group), or a substituted or unsubstituted C6-C60 aryl group (for example, a phenyl group, a substituted phenyl group, a biphenyl group, a substituted biphenyl group).

[0038] The present invention does not limit the types of substituents of alkenyl, alkyl, alkynyl and aryl groups, and may be substituents commonly used in the art, for example, may be at least one of halogen, cyano, ester, nitro, amino, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted alkoxy, isocyano, isocyanate and substituted or unsubstituted aryl.

[0039] Further, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, and R14 are each independently selected from hydrogen, halogen, substituted or unsubstituted C1-C5 alkyl, substituted or unsubstituted C2-C5 alkenyl, substituted or unsubstituted C2-C5 alkynyl, or substituted or unsubstituted C6-C10 aryl.

[0040] Illustratively, the phosphonosulfone compounds include the compounds shown below;

[0041] , , ,

[0042] ABC

[0043] , ,

[0044] DEF.

[0045] The inventors found in the study that when the mass percentage of phosphonosulfone compounds in the electrolyte is 0.1% to 20%, the phosphonosulfone compounds can better form a high-quality protective film at the positive electrode and the negative electrode, protect the positive electrode and the negative electrode during the battery cycle, and improve the battery's cycle performance and storage performance. Exemplarily, in the electrolyte, the mass percentage of phosphonosulfone compounds is 0.1%, 0.2%, 0.5%, 1%, 3%, 5%, 10%, 15%, 20%, or any two of them.

[0046] Furthermore, in the electrolyte, the mass percentage of the phosphonosulfone compound is 0.5% to 5%.

[0047] In some embodiments of the present invention, the electrolyte further includes a negative electrode film-forming agent, and the negative electrode film-forming agent is selected from at least one of vinylene carbonate (VC), fluoroethylene carbonate, vinyl ethylene carbonate, 1,3-propane sultone, 1,3-propylene sultone, vinyl sulfate (DTD), lithium difluorophosphate, lithium difluorobis(oxalate) phosphate, and lithium tetrafluorooxalate phosphate.

[0048] In the present invention, when the electrolyte also includes the above-mentioned negative electrode film-forming agent, the negative electrode film-forming agent and the phosphonosulfonate compound can act synergistically to further form a stable SEI film at the interface of the negative electrode, inhibiting the generation of gas on the surface of the negative electrode under high temperature and high pressure, thereby improving the room temperature cycle performance, high temperature storage performance and high temperature cycle performance of the battery.

[0049] Furthermore, when the mass percentage of the negative electrode film-forming agent in the electrolyte is 0.1-3%, the negative electrode film-forming agent can synergistically act with the phosphonylsulfonate compounds to improve the room temperature cycle performance, high temperature storage performance and high temperature cycle performance of the battery.

[0050] Illustratively, in the electrolyte, the mass percentage of the negative electrode film-forming agent may be any one of 0.1%, 0.3%, 0.5%, 1%, 2.5%, 3%, or a range consisting of any two of the following.

[0051] It can be understood that the electrolyte also includes a solvent, and the solvent can be a non-aqueous organic solvent, and the non-aqueous organic solvent can be selected from at least one of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, methylpropyl carbonate, γ-butyrolactone, methyl formate, ethyl acetate, methyl acetate, propyl acetate (EP), butyl acetate, ethyl propionate, propyl propionate and butyl propionate. The present invention can select the type of solvent in the electrolyte and the content of the solvent according to actual needs.

[0052] The electrolyte may further include a lithium salt, and the lithium salt may be selected from at least one of lithium hexafluorophosphate, lithium perchlorate, lithium tetrafluoroborate, lithium bis(trifluoromethylsulfonyl)imide and lithium bis(fluorosulfonyl)imide.

[0053] The present invention can select the type and content of the lithium salt in the electrolyte according to actual needs. For example, when the lithium salt includes lithium hexafluorophosphate and / or lithium bis(fluorosulfonyl)imide, the obtained electrolyte can further improve the overall performance of the battery.

[0054] Furthermore, when the lithium salt includes lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide at the same time, it can not only improve the conductivity and thermal decomposition temperature of the electrolyte, but also reduce the decomposition of lithium hexafluorophosphate, thereby further improving the service life of the battery.

[0055] The inventors found in their research that when the concentration of lithium salt in the electrolyte is 0.5-2 mol / L, the lithium salt can be better matched with the electrolyte additive to obtain an electrolyte that can further improve the battery cycle performance.

[0056] For example, the concentration of the lithium salt in the electrolyte may be any one of 0.5 mol / L, 0.6 mol / L, 0.8 mol / L, 1 mol / L, 1.5 mol / L, 2 mol / L, or any combination thereof. Further, the concentration of the lithium salt in the electrolyte may be 0.9-1.3 mol / L.

[0057] In some embodiments, when the lithium salt includes lithium bis(fluorosulfonyl)imide, the concentration of lithium bis(fluorosulfonyl)imide in the electrolyte may be 0.1-0.4 mol / L. For example, the concentration of lithium bis(fluorosulfonyl)imide in the electrolyte may be any one of 0.1 mol / L, 0.2 mol / L, 0.3 mol / L, 0.4 mol / L, or any two of them.

[0058] A second aspect of the present invention provides a battery, comprising the electrolyte of the first aspect.

[0059] It can be understood that the battery of the present invention further includes a positive electrode sheet, a negative electrode sheet, a separator and an outer package. In the present invention, the positive electrode sheet, the separator and the negative electrode sheet can be stacked to form an electrode assembly of a laminated structure, and then the electrode assembly can be placed in an outer package, and an electrolyte can be injected into the outer package, and the battery can be formed after being sealed and dried; or the positive electrode sheet, the separator and the negative electrode sheet can be stacked and then wound to form an electrode assembly of a wound structure, and then the electrode assembly can be placed in an outer package, and an electrolyte can be injected into the outer package, and the battery can be formed after being sealed and dried.

[0060] The battery of the present invention comprises the electrolyte of the first aspect, so the battery has excellent room temperature cycle performance, high temperature storage performance and high temperature cycle performance.

[0061] A third aspect of the present invention provides an electronic device, wherein a driving source or an energy storage source of the electronic device is the battery of the first aspect.

[0062] In some embodiments, the electronic device may be any device that uses a secondary battery as a driving source or energy storage source, such as a mobile phone, a navigation system, a drone, an electric car, or the like.

[0063] Since the driving source or energy storage source of the electronic device of the present invention is the battery of the second aspect, the electronic device has excellent battery life and broad market application prospects.

[0064] The technical solution of the present invention will be further described below in conjunction with specific embodiments.

[0065] Example 1

[0066] The battery of this embodiment is prepared by a method comprising the following steps:

[0067] 1) Preparation of electrolyte

[0068] Ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mixed at a mass ratio of EC:EMC:DEC=3:2:5 to obtain a mixed solvent, and then lithium salt lithium hexafluorophosphate (LiPF6) and lithium bis(fluorosulfonyl)imide (LiFSI) are added to dissolve the lithium salt in the mixed solvent to prepare concentrations of 1.0 mol / L and 0.2 mol / L, respectively, and then an electrolyte additive and a negative electrode film-forming agent are added, and the mixture is evenly mixed to obtain an electrolyte;

[0069] The types and contents of electrolyte additives and film-forming agents are shown in Table 1.

[0070] 2) Preparation of positive electrode

[0071] The ternary material (specifically NCM622), Super-P, CNT and PVDF are mixed in a mass ratio of 96:1:1.5:1.5 to obtain a mixed material, the mixed material is dispersed in NMP, and stirred under a vacuum stirrer until stable and uniform to obtain a positive electrode slurry;

[0072] The positive electrode slurry was uniformly coated on both surfaces of an aluminum foil with a thickness of 12 μm, and then transferred to a 120° C. forced air oven for drying for 2 h after drying at room temperature. The positive electrode sheet was then obtained through cold pressing and slitting processes.

[0073] 3) Preparation of negative electrode

[0074] Graphite, carbon black, SBR and CMC are mixed in a mass ratio of 96:1:1:2 to obtain a mixed material, and then the mixed material is dispersed in deionized water to obtain a negative electrode slurry;

[0075] The negative electrode slurry was uniformly coated on both surfaces of a copper foil with a thickness of 6 μm, and then transferred to a 120° C. forced air oven for drying for 2 h after drying at room temperature, and then cold pressed and cut to obtain a negative electrode sheet.

[0076] 4) Preparation of lithium-ion batteries

[0077] The positive electrode sheet, PP separator and negative electrode sheet are stacked and wound to obtain an electrode assembly with a wound structure. The electrode assembly is placed in an aluminum-plastic film packaging shell, and then the electrolyte is injected and sealed in sequence. After standing, hot and cold pressing, formation, capacity division and other processes, a lithium-ion battery is produced.

[0078] Examples 2-22, Comparative Examples 1-4

[0079] The preparation methods of the batteries of Examples 2-22 and Comparative Examples 1-4 are substantially the same as those of Example 1, except for the preparation of the electrolyte. The specific differences in the electrolytes are shown in Table 1.

[0080] Performance Testing

[0081] The following performance tests were performed on the batteries of the embodiment and the comparative example, and the test results are shown in Table 2;

[0082] 1) Normal temperature cycle test

[0083] The lithium-ion battery was charged to 4.5 V at 1 C constant current at 25°C, then charged at constant voltage to a cutoff current of 0.05 C, left to stand for 1 h, and then discharged to 2.5 V at 1 C constant current. This was recorded as one charge and discharge cycle. 800 cycles were performed under the above conditions; the capacity retention rate (%) of the lithium-ion battery after 800 cycles = (discharge capacity of the 800th cycle / discharge capacity of the first cycle) × 100%.

[0084] 2) High temperature cycle test

[0085] The lithium-ion battery was charged to 4.5V at 1C constant current at 45°C, then charged at constant voltage to a cutoff current of 0.05C, left to stand for 1h, and then discharged to 2.5V at 1C constant current, which was recorded as one charge and discharge cycle. The battery was then cycled 400 times under the above conditions. The capacity retention rate (%) of the lithium-ion battery after 400 cycles = (discharge capacity of the 400th cycle / discharge capacity of the first cycle) × 100%.

[0086] 3) High temperature storage test

[0087] The lithium-ion battery was charged to 4.5V at 1C constant current and constant voltage at 25℃, cut off at 0.05C, and left to stand for 1h, then discharged to 2.5V at 1C constant current, and the discharge capacity was calculated as the initial capacity C0. The battery volume V0 before storage was measured, and the battery was transferred to a high-temperature test cabinet and stored at 60℃ for 28 days; after the storage was completed, the test battery was taken out and left at room temperature for 10h, and the battery volume V1 after storage was measured, and then discharged to 2.5V at 1C constant current, and the discharge capacity C1 was recorded, and left for 120min, and charged to 4.5V at 1C constant current and constant voltage, cut off at 0.05C, and left to stand for 1h, and then discharged to 2.5V at 1C constant current, and the discharge capacity C2 was recorded;

[0088] Capacity retention rate (%) = C1 / C0*100%;

[0089] Capacity recovery rate (%) = C2 / C0*100%.

[0090] Battery volume expansion rate (%) = [(V1-V0) / V0]*100%.

[0091] Table 1

[0092]

[0093] Table 2

[0094]

[0095] As can be seen from Table 2, compared with the comparative example, the battery in the embodiment of the present invention has more excellent room temperature cycle performance, high temperature cycle performance and high temperature storage performance, indicating that the present invention includes phosphonosulfone compounds in the electrolyte, which can effectively improve the high temperature cycle performance, room temperature cycle performance and high temperature storage performance of the battery;

[0096] It can be seen from Example 4 and Example 15 that by adding a negative electrode film-forming agent to the electrolyte, the high temperature cycle performance, room temperature cycle performance and high temperature storage performance of the battery can be further improved;

[0097] It can be seen from Example 15 and Example 17 that by further selecting the content of the phosphonosulfone compound in the electrolyte, the high temperature cycle performance, normal temperature cycle performance, high temperature storage capacity retention rate, and high temperature storage capacity recovery rate of the battery can be significantly improved without substantially changing the high temperature storage volume expansion rate of the battery.

[0098] It can be seen from Examples 1, 18-19 and 20 that the high temperature cycle performance, room temperature cycle performance and high temperature storage performance of the battery can be improved by selecting the content of the negative electrode film-forming agent in the electrolyte;

[0099] It can be seen from Example 15 and Example 21 that when the lithium salt includes lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide, the obtained battery has more excellent high temperature storage performance, high temperature cycle performance and room temperature cycle performance;

[0100] It can be seen from Example 21 and Example 22 that by selecting the content of lithium salt in the electrolyte, the high-temperature storage performance, high-temperature cycle performance and room-temperature cycle performance of the battery can be further improved.

[0101] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. An electrolyte, It is characterized in that The electrolyte includes an electrolyte additive, the electrolyte additive includes a phosphonosulfone compound and a negative electrode film-forming agent, and the negative electrode film-forming agent includes vinyl sulfate; In the electrolyte, the mass percentage of the phosphonosulfonate compound is 2.5% to 20%, and the mass percentage of the vinyl sulfate is 0.1-3%; The phosphonosulfone compound includes a compound shown in Formula 1 or Formula 2; Formula 1; Formula 2; Wherein, a, b, c, and d are each independently 0 or 1; R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, and R14 are each independently selected from hydrogen, halogen, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C2-C30 alkynyl, or substituted or unsubstituted C6-C60 aryl.

2. The electrolyte according to claim 1, It is characterized in that R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, and R14 are each independently selected from hydrogen, halogen, substituted or unsubstituted C1-C5 alkyl, substituted or unsubstituted C2-C5 alkenyl, substituted or unsubstituted C2-C5 alkynyl, or substituted or unsubstituted C6-C10 aryl.

3. The electrolyte according to claim 1 or 2, It is characterized in that The phosphonosulfone compounds include the compounds shown below; 、 、 、 、 、 。 4. The electrolyte according to claim 1 or 2, It is characterized in that The electrolyte further includes a lithium salt, and the lithium salt includes lithium hexafluorophosphate and / or lithium bis(fluorosulfonyl)imide.

5. The electrolyte according to claim 3, It is characterized in that The electrolyte further includes a lithium salt, and the lithium salt includes lithium hexafluorophosphate and / or lithium bis(fluorosulfonyl)imide.

6. The electrolyte according to claim 4, It is characterized in that In the electrolyte, the concentration of lithium salt is 0.5-2 mol / L.

7. The electrolyte according to claim 5, It is characterized in that In the electrolyte, the concentration of lithium salt is 0.5-2 mol / L.

8. A battery, It is characterized in that The battery comprises the electrolyte according to any one of claims 1 to 7.

9. An electronic device, It is characterized in that The driving source or energy storage source of the electronic device is the battery according to claim 8.

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