Electrolytes and lithium-ion batteries

Abstract

This invention provides an electrolyte and a lithium-ion battery. The electrolyte, by weight percentage, comprises 10-15% lithium salt, 80-87% organic solvent, and 0.1-5% additives; wherein the additives include a first additive and a second additive; the first additive is selected from any one or more of the above; the second additive has the following structural formula: The first additive of this application can generate a dense and stable passivation film on the negative electrode at a lower voltage. The second additive can generate a sulfur-containing SEI film with high mechanical strength at a specific voltage, thereby helping to reduce impedance. Through the synergistic effect of the first and second additives, this application enables the SEI film to have higher stability and lower impedance, thus allowing the lithium-ion battery to simultaneously achieve high high-temperature cycle stability and high low-temperature cycle stability.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery technology, and more specifically, to an electrolyte and a lithium-ion battery. Background Technology

[0002] Since the beginning of the 21st century, with the ever-increasing demand for fossil fuels, the consumption of non-renewable resources has accelerated significantly, making the development of renewable energy a topic of global discussion. Against this backdrop, new energy electric vehicles have emerged and are gradually replacing current gasoline-powered vehicles.

[0003] However, a major disadvantage of new energy electric vehicles is their poor performance in high-temperature environments. Temperature has a significant impact on the charge and discharge performance of batteries. The electrode / electrolyte interface is considered the heart of the battery, and the electrochemical reactions at this interface are related to ambient temperature. At high temperatures, the active materials in the electrolyte degrade more rapidly, reducing their activity and increasing the concentration gradient and polarization, ultimately leading to a decrease in battery capacity. More importantly, high temperatures can damage the negative electrode, causing lithium deposition and increasing the risk of short circuits.

[0004] In response to the predicament of lithium-ion batteries in high-temperature environments, some related work has been reported. For example, Chinese patent application CN115882066A proposes a high-temperature lithium-ion battery electrolyte and a lithium-ion battery using the electrolyte. It improves the additives in the electrolyte to reduce the oxidative decomposition of the solvent and related side reactions, but it does not solve the problem of its conductivity, making it extremely limited at high temperatures. Summary of the Invention

[0005] The main objective of this invention is to provide an electrolyte and a lithium-ion battery to solve the problem that existing lithium-ion batteries cannot simultaneously achieve high high-temperature cycle stability and high low-temperature cycle stability.

[0006] To achieve the above objectives, according to one aspect of the present invention, an electrolyte is provided, comprising, by mass percentage, 10-15% lithium salt, 80-87% organic solvent and 0.1-5% additives; wherein the additives include a first additive and a second additive.

[0007] The first additive is selected from Any one or more of the following; the structural formula of the second additive is as follows:

[0008]

[0009] Furthermore, the mass ratio of the first additive to the second additive is 0.1 to 2:1.

[0010] Furthermore, the aforementioned first additive is The combination, and The mass ratio is 0.2 to 1:1.

[0011] Furthermore, the aforementioned first additive is The combination, and The mass ratio is 0.2 to 1:1, preferably 0.3 to 1:1.

[0012] Furthermore, the above-mentioned additives also include a third additive, which is selected from any one or more of trimethyl borate, lithium difluorooxalate borate, vinylene carbonate, vinyl sulfate, and fluorovinyl carbonate.

[0013] Furthermore, the aforementioned third additive is a mixture of vinylene carbonate and fluoroethylene carbonate, and the mass ratio of vinylene carbonate to fluoroethylene carbonate is 1:6 to 3:1.

[0014] Furthermore, the ratio of the total mass of the first and second additives to the mass of the third additive is 1:3 to 1:1.

[0015] Furthermore, the lithium salt is selected from any one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis(oxalate)borate, lithium difluorooxalateborate, lithium perchlorate, lithium tetrafluoroborate, lithium bis(trifluoromethanesulfonyl)imide, and lithium bis(fluorosulfonyl)imide.

[0016] Furthermore, the aforementioned organic solvent is selected from any one or more of ethylene carbonate, propylene carbonate, butene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, dimethyl ether, diethyl ether, methyl formate, ethyl acetate, methyl propionate, ethyl propionate, butyl propionate, and ethyl butyrate.

[0017] According to another aspect of the present invention, a lithium-ion battery is provided, comprising a positive electrode, a separator, an electrolyte, and a negative electrode, wherein the electrolyte is the electrolyte described above.

[0018] By applying the technical solution of this application, a first additive and a second additive are added to the electrolyte. The first additive can generate a dense and stable passivation film on the negative electrode at a lower voltage. The second additive can generate a sulfur-containing SEI film with high mechanical strength at a specific voltage, thereby helping to reduce impedance. This application achieves higher stability and lower impedance of the SEI film through the synergistic effect of the first and second additives, thus improving the lithium-ion transport efficiency. Specifically, on the one hand, the sulfonamide group in the second additive may react with the carboxylate ions, a decomposition product of the first additive, to form ester compounds, which contributes to the stability and density of the SEI film. On the other hand, the sulfur element contained in the second additive may react with the decomposition products of the first additive to form sulfides or thioester compounds, which help reduce the impedance of the SEI film and improve its mechanical strength. In addition, the second additive also helps to reduce the decomposition of fluorine-containing additives in the electrolyte and modify the interface, thereby reducing the occurrence of side reactions at the interface between the electrolyte and the positive electrode material and the dissolution of metals in the positive electrode material, thus helping to improve the cycle stability of the lithium-ion battery at high and low temperatures.

[0019] Furthermore, at low voltages, the additives of this application can form a stable SEI film on the surface of the cathode material more rapidly than ethylene carbonate and vinylene carbonate, which helps to improve the stability of the interface between the electrolyte and the cathode material. The formed SEI film also exhibits lower impedance, thereby further improving the cycle stability of the lithium-ion battery at high temperatures. Therefore, adding the first and second additives to the electrolyte of this application helps to improve the stability of both the electrolyte and the formed SEI film, enabling the lithium-ion battery to simultaneously achieve high high-temperature cycle stability and high low-temperature cycle stability. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the embodiments.

[0021] As analyzed in the background section of this application, existing lithium-ion batteries have the problem of simultaneously achieving high high-temperature cycle stability and high low-temperature cycle stability. To solve this problem, this application provides an electrolyte and a lithium-ion battery.

[0022] In a typical embodiment of this application, an electrolyte is provided, comprising, by mass percentage, 10-15% lithium salt, 80-87% organic solvent, and 0.1-5% additives; wherein the additives include a first additive and a second additive; the first additive is selected from... Any one or more of the following; the structural formula of the second additive is as follows:

[0023]

[0024] This application incorporates a first additive and a second additive in its electrolyte. The first additive generates a dense and stable passivation film on the negative electrode at a lower voltage. The second additive generates a sulfur-containing SEI film with high mechanical strength at a specific voltage, thereby helping to reduce impedance. Through the synergistic effect of the first and second additives, this application achieves higher stability and lower impedance in the SEI film, thus improving lithium-ion transport efficiency. Specifically, on one hand, the sulfonamide group in the second additive may react with the carboxylate ions, a decomposition product of the first additive, to form ester compounds, which contributes to the stability and density of the SEI film. On the other hand, the sulfur element contained in the second additive may react with the decomposition products of the first additive to form sulfides or thioester compounds, which help reduce the impedance of the SEI film and improve its mechanical strength. Furthermore, the second additive also helps reduce the decomposition of fluorine-containing additives in the electrolyte and modifies the interface, thereby reducing side reactions at the interface between the electrolyte and the positive electrode material and the dissolution of metals from the positive electrode material, thus contributing to improved cycle stability of the lithium-ion battery at high and low temperatures.

[0025] Furthermore, at low voltages, the additives of this application can form a stable SEI film on the surface of the cathode material more rapidly than ethylene carbonate and vinylene carbonate, which helps to improve the stability of the interface between the electrolyte and the cathode material. The formed SEI film also exhibits lower impedance, thereby further improving the cycle stability of the lithium-ion battery at high temperatures. Therefore, adding the first and second additives to the electrolyte of this application helps to improve the stability of both the electrolyte and the formed SEI film, enabling the lithium-ion battery to simultaneously achieve high high-temperature cycle stability and high low-temperature cycle stability.

[0026] In addition, this application provides a second additive. The preparation method is as follows:

[0027] In one embodiment of this application, the mass ratio of the first additive to the second additive is 0.1 to 2:1.

[0028] Preferably controlling the mass ratio of the first additive to the second additive within the above range helps to fully leverage the synergistic effect between the first additive and the second additive, thereby helping to improve the stability of the electrolyte at high temperatures and the stability of the SEI film formed on the surface of the positive electrode material.

[0029] Furthermore, the mass ratio of the first additive to the second additive can be 0.1:1, 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, or 2:1. Of course, the mass ratio of the first additive to the second additive can be any value within the range of 0.1 to 2:1. Preferably, the mass ratio of the first additive to the second additive can be any value within the range of 0.5 to 2:1. Further, it is preferred that the mass ratio of the first additive to the second additive can be any value within the range of 1 to 2:1. These details will not be elaborated further here.

[0030] In one embodiment of this application, the first additive is... The combination, and The mass ratio is 0.2 to 1:1.

[0031] Preferably, the type of the first additive is controlled within the above-mentioned range, and the control is... The mass ratio within the above range helps to form a denser and more uniform SEI film, thereby helping to improve the stability of the electrolyte at high temperatures and the stability of the formed SEI film.

[0032] also, The mass ratio can be 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, or 1:1. Of course, The mass ratio can be any value within the range of 0.2 to 1:1, preferably... The mass ratio can be any value within the range of 0.5 to 1:1, and more preferably... The mass ratio can be any value between 0.8 and 1:1, which will not be elaborated here.

[0033] In one embodiment of this application, the first additive is... and The mass ratio is 0.2 to 1:1, preferably 0.3 to 1:1.

[0034] Preferably, the type of the first additive is controlled within the above-mentioned range, and the control is... The mass ratio within the above range helps to form the positive electrode CEI film and inhibits the dissolution of transition metals, thereby helping to improve the stability of the electrolyte at high temperatures and the stability of the formed SEI and CEI films.

[0035] also, The mass ratio can be 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, or 1:1. Of course, The mass ratio can be any value within the range of 0.2 to 1:1, preferably... The mass ratio can be any value within the range of 0.3 to 1:1, and more preferably... The mass ratio can be any value between 0.5 and 1:1, which will not be elaborated here.

[0036] In one embodiment of this application, the above-mentioned additive further includes a third additive, which is selected from any one or more of trimethyl borate, lithium difluorooxalate borate, vinylene carbonate, vinyl sulfate and fluoroethylene carbonate; preferably, the third additive is vinylene carbonate and fluoroethylene carbonate, and the mass ratio of vinylene carbonate to fluoroethylene carbonate is 1:6 to 3:1.

[0037] Adding a third additive to the additives, preferably controlling the type of the third additive within the above-mentioned range, and preferably controlling the mass ratio of vinylene carbonate to fluoroethylene carbonate within the above-mentioned range, helps to further improve the stability of the electrolyte at high temperatures.

[0038] Furthermore, the mass ratio of vinylene carbonate to fluoroethylene carbonate can be 1:6, 1:5, 1:4, 1:3, 1:2, 1:1, 3:2, 2:1, 5:2, or 3:1. Of course, the mass ratio of vinylene carbonate to fluoroethylene carbonate can be any value within the range of 1:6 to 3:1. Preferably, the mass ratio of vinylene carbonate to fluoroethylene carbonate can be any value within the range of 1:6 to 1:1. Further, it is preferred that the mass ratio of vinylene carbonate to fluoroethylene carbonate can be any value within the range of 1:6 to 1:2. These details will not be elaborated further here.

[0039] In one embodiment of this application, the ratio of the total mass of the first additive and the second additive to the mass of the third additive is 1:3 to 1:1.

[0040] Preferably controlling the ratio of the total mass of the first and second additives to the mass of the third additive within the above range helps to improve the synergistic effect among the three, generate a good interfacial film at the positive and negative electrodes, promote long-term battery cycling, and thus help improve the stability of the electrolyte at high temperatures and the stability of the formed SEI film.

[0041] Furthermore, the ratio of the total mass of the first and second additives to the mass of the third additive can be 1:3, 1:2.5, 1:2, 1:1.5, or 1:1. Of course, the ratio of the total mass of the first and second additives to the mass of the third additive can be any value within the range of 1:3 to 1:1. Preferably, the ratio of the total mass of the first and second additives to the mass of the third additive can be any value within the range of 1:2 to 1:1. Further, it is preferred that the ratio of the total mass of the first and second additives to the mass of the third additive can be any value within the range of 1:1.5 to 1:1. These details will not be elaborated further here.

[0042] To further improve the lithium-ion conductivity in the electrolyte, in one embodiment of this application, the lithium salt is preferably selected from any one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis(oxalate)borate, lithium difluorooxalateborate, lithium perchlorate, lithium tetrafluoroborate, lithium bis(trifluoromethanesulfonyl)imide, and lithium bis(fluorosulfonyl)imide.

[0043] To further improve the solubility of lithium salts and the stability of the electrolyte, in one embodiment of this application, the organic solvent is preferably selected from any one or more of ethylene carbonate, propylene carbonate, butene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, dimethyl ether, diethyl ether, methyl formate, ethyl acetate, methyl propionate, ethyl propionate, butyl propionate, and ethyl butyrate.

[0044] Furthermore, the preparation method of the electrolyte in this application includes: under an inert atmosphere, with a water content of less than 5 ppm and an oxygen content of less than 5 ppm, weighing a certain amount of organic solvent and lithium salt, and then adding additives and stirring until completely dissolved.

[0045] In another typical embodiment of this application, a lithium-ion battery is provided, including a positive electrode, a separator, an electrolyte, and a negative electrode, wherein the electrolyte is the aforementioned electrolyte.

[0046] Since the lithium-ion battery contains the electrolyte of this application, it can achieve both high high-temperature cycle stability and high low-temperature cycle stability.

[0047] The beneficial effects of this application will be further illustrated below with reference to the embodiments.

[0048] Example 1

[0049] In an inert atmosphere glove box with both water and oxygen content below 5 ppm, ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) were prepared as an organic solvent in a mass ratio of 30:60:10. Lithium hexafluorophosphate and lithium difluorosulfonyl imide (3:1) were slowly added to the prepared organic solvent until dissolved. Then, 4% of the total electrolyte mass of an additive, ethylene carbonate (VC), was added as the first additive. Second additive (Bailingwei Technology Co., Ltd.), among which, The mass ratio of the first additive to the second additive is 1:1, and the mixture is thoroughly stirred until completely dissolved to obtain the lithium-ion battery electrolyte. The electrolyte consists of lithium salts (lithium hexafluorophosphate and lithium difluorosulfonylimide), organic solvent, and vinylene carbonate (VC). Second additive The mass fractions were 12%, 84%, 2%, 0.5%, 0.5%, and 1%, respectively.

[0050] Preparation of cathode materials

[0051] A mixture of 92% NCM811, 3% conductive agent SP, 2% single-walled carbon nanotubes, and 3% binder PVDF was prepared by mass ratio. N-methylpyrrolidone solvent was added and stirred to form a homogeneous slurry. This slurry was then coated onto 12-micron thick aluminum foil, rolled, and slit to obtain the cathode material.

[0052] Preparation of negative electrode materials

[0053] The silicon-carbon alloy with a mass ratio of 85%, single-walled carbon nanotubes with a mass ratio of 10%, and SBR binder with a mass ratio of 5% was mixed evenly, and deionized water was added as a solvent. The slurry was then coated onto an 8-micron copper foil, dried, and rolled and slit to obtain the negative electrode material.

[0054] Battery manufacturing

[0055] In a dry environment with the dew point controlled below -60℃, the positive electrode, separator, and negative electrode are stacked in sequence, ensuring that the separator completely separates the positive and negative electrodes and that the negative electrode completely covers the positive electrode. The stacked electrodes are then used to form a battery cell, which is hot-pressed and sealed in an aluminum-plastic film with adhesive tabs. After baking until the moisture content is within acceptable limits, the electrolyte prepared above is injected into the soft-pack battery cell. Subsequently, the cell is sealed, formed, aged a second time, and tested to obtain a lithium-ion battery for testing.

[0056] Example 2

[0057] The difference from Example 1 is that the mass ratio of the first additive to the second additive is 0.1:1, and a lithium-ion battery is finally obtained.

[0058] Example 3

[0059] The difference from Example 1 is that the mass ratio of the first additive to the second additive is 1:0.4, and a lithium-ion battery is finally obtained.

[0060] Example 4

[0061] The difference from Example 1 is that, The mass ratio is 0.2:1, and a lithium-ion battery is finally obtained.

[0062] Example 5

[0063] The difference from Example 1 is that, The mass ratio is 0.1:1, and a lithium-ion battery is finally obtained.

[0064] Example 6

[0065] The difference from Example 1 is that, The combination, and The mass ratio is 1:1, which ultimately yields a lithium-ion battery.

[0066] Example 7

[0067] The difference from Example 6 is that, The mass ratio is 0.3:1, which ultimately yields a lithium-ion battery.

[0068] Example 8

[0069] The difference from Example 6 is that, The mass ratio is 0.2:1, which ultimately yields a lithium-ion battery.

[0070] Example 9

[0071] The difference from Example 1 is that vinylene carbonate (VC), Second additive The mass fractions were 3%, 0.25%, 0.25%, and 0.5% of the total mass of the electrolyte, respectively, to finally obtain lithium-ion batteries.

[0072] Example 10

[0073] The difference from Example 1 is that vinylene carbonate (VC), Second additive The mass fractions were 3.2%, 0.2%, 0.2%, and 0.4% of the total mass of the electrolyte, respectively, to finally obtain a lithium-ion battery.

[0074] Example 11

[0075] The difference from the example is that the mass fraction of the third additive is 2% of the total mass of the electrolyte, and the third additive is a mixture of vinylene carbonate and fluoroethylene carbonate in a mass ratio of 1:1, ultimately yielding a lithium-ion battery.

[0076] Example 12

[0077] The difference from the example is that the mass fraction of the third additive is 2% of the total mass of the electrolyte, and the third additive is a mixture of vinylene carbonate and fluoroethylene carbonate in a mass ratio of 1:6, ultimately yielding a lithium-ion battery.

[0078] Example 13

[0079] The difference from the example is that the mass fraction of the third additive is 2% of the total mass of the electrolyte, and the third additive is a mixture of vinylene carbonate and fluoroethylene carbonate in a mass ratio of 3:1, ultimately yielding a lithium-ion battery.

[0080] Comparative Example 1

[0081] The difference from Example 1 is that the additive is the first additive. (The mass ratio of the two is 1:1), vinylene carbonate (VC), wherein the first additive is 2% of the total mass of the electrolyte, vinylene carbonate (VC) is 2% of the total mass of the electrolyte, and the content of the remaining components is the same as in Example 1, and finally a lithium-ion battery is obtained.

[0082] Comparative Example 2

[0083] The difference from Example 1 is that the additive is a second additive. The electrolyte contains vinylene carbonate (VC), wherein the second additive is 2% of the total mass of the electrolyte, and the content of the remaining components is the same as in Example 1, and a lithium-ion battery is finally obtained.

[0084] The lithium-ion batteries in the above embodiments and comparative examples were subjected to high-temperature cycling (55°C), high-temperature discharge (55°C), high-temperature storage (55°C@14 days), and low-temperature discharge (-20°C) tests. The results are shown in the table below.

[0085] Table 1

[0086]

[0087]

[0088] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0089] This application incorporates a first additive and a second additive in its electrolyte. The first additive generates a dense and stable passivation film on the negative electrode at a lower voltage. The second additive generates a sulfur-containing SEI film with high mechanical strength at a specific voltage, thereby helping to reduce impedance. Through the synergistic effect of the first and second additives, this application achieves higher stability and lower impedance in the SEI film, thus improving lithium-ion transport efficiency. Specifically, on one hand, the sulfonamide group in the second additive may react with the carboxylate ions, a decomposition product of the first additive, to form ester compounds, which contributes to the stability and density of the SEI film. On the other hand, the sulfur element contained in the second additive may react with the decomposition products of the first additive to form sulfides or thioester compounds, which help reduce the impedance of the SEI film and improve its mechanical strength. Furthermore, the second additive also helps reduce the decomposition of fluorine-containing additives in the electrolyte and modifies the interface, thereby reducing side reactions at the interface between the electrolyte and the positive electrode material and the dissolution of metals from the positive electrode material, thus contributing to improved cycle stability of the lithium-ion battery at high and low temperatures.

[0090] Furthermore, at low voltages, the additives of this application can form a stable SEI film on the surface of the cathode material more rapidly than ethylene carbonate and vinylene carbonate, which helps to improve the stability of the interface between the electrolyte and the cathode material. The formed SEI film also exhibits lower impedance, thereby further improving the cycle stability of the lithium-ion battery at high temperatures. Therefore, adding the first and second additives to the electrolyte of this application helps to improve the stability of both the electrolyte and the formed SEI film, enabling the lithium-ion battery to simultaneously achieve high high-temperature cycle stability and high low-temperature cycle stability.

[0091] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electrolyte, characterized in that, The electrolyte comprises, by mass percentage, 10-15% lithium salt, 80-87% organic solvent and 0.1-5% additives; The additives include a first additive and a second additive; The first additive is selected from , , and Any one or more of the following; The structural formula of the second additive is as follows: ； The mass ratio of the first additive to the second additive is 0.1 to 2:1; The organic solvent is selected from any one or more of ethylene carbonate, propylene carbonate, butene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, dimethyl ether, diethyl ether, methyl formate, ethyl acetate, methyl propionate, ethyl propionate, butyl propionate, and ethyl butyrate.

2. The electrolyte according to claim 1, characterized in that, The first additive is and The combination of, and the and stated The mass ratio is 0.2 to 1:

1.

3. The electrolyte according to claim 1, characterized in that, The first additive is and The combination of, and the and stated The mass ratio is 0.2 to 1:

1.

4. The electrolyte according to claim 3, characterized in that, The and stated The mass ratio is 0.3 to 1:

1.

5. The electrolyte according to any one of claims 1 to 4, characterized in that, The additive also includes a third additive, which is selected from any one or more of trimethyl borate, lithium difluorooxalate borate, vinylene carbonate, vinyl sulfate, and fluorovinyl carbonate.

6. The electrolyte according to claim 5, characterized in that, The third additive is a mixture of the vinylene carbonate and the fluoroethylene carbonate, and the mass ratio of the vinylene carbonate to the fluoroethylene carbonate is 1:6 to 3:

1.

7. The electrolyte according to claim 6, characterized in that, The ratio of the total mass of the first additive and the second additive to the mass of the third additive is 1:3 to 1:

1.

8. The electrolyte according to any one of claims 1 to 4, characterized in that, The lithium salt is selected from any one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis(oxalate)borate, lithium difluorooxalateborate, lithium perchlorate, lithium tetrafluoroborate, lithium bis(trifluoromethanesulfonyl)imide, and lithium bis(fluorosulfonyl)imide.

9. A lithium-ion battery, comprising a positive electrode, a separator, an electrolyte, and a negative electrode, characterized in that, The electrolyte is the electrolyte according to any one of claims 1 to 8.

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