CN117293388A - Nonaqueous electrolyte and battery - Google Patents

Nonaqueous electrolyte and battery Download PDF

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Publication number
CN117293388A
CN117293388A CN202310759201.9A CN202310759201A CN117293388A CN 117293388 A CN117293388 A CN 117293388A CN 202310759201 A CN202310759201 A CN 202310759201A CN 117293388 A CN117293388 A CN 117293388A
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additive
electrolyte
compound
electrolytic solution
nonaqueous electrolytic
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刘雨蒙
李枫
张昌明
胡大林
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Huizhou Highpower Technology Co Ltd
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Huizhou Highpower Technology Co Ltd
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H01M2300/0028—Organic electrolyte characterised by the solvent
    • 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
    • H01M2300/0028—Organic electrolyte characterised by the solvent
    • H01M2300/0037—Mixture of solvents

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

In order to solve the problem that the electrolyte does not have the function of stabilizing the positive electrode under the high temperature condition, so that the high temperature circulation and storage performance of the battery are affected, the invention provides a non-aqueous electrolyte and a battery, wherein the non-aqueous electrolyte comprises electrolyte salt, an organic solvent and an additive, the additive comprises a phosphorus-containing compound, the phosphorus-containing compound comprises a compound A and/or a compound B, and the compound A is one or more of compounds shown in a structural formula I; the compound B is one or more of compounds shown in a structural formula II; wherein R is 1 ‑R 6 From independently selected from the group consisting of siloxane substituents, C1-C20 alkyl, C1-C20 haloalkyl, C1-C20 alkoxy, C1-C20 haloalkoxy, C2-C20 alkenyl, C2-C20 haloalkenyl, C2-C20 alkenyloxy, C2-C20 haloalkenyloxy, C6-C20 aryl, C6-C20 haloaryl, C6-C20 aryloxy, C6-C20 haloaryloxy, amino, hydroxy, or halogen, and R 1 ‑R 6 At least one of which is a siloxane substituent.

Description

Nonaqueous electrolyte and battery
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a nonaqueous electrolyte and a battery.
Background
The lithium ion battery has the advantages of high working voltage, high energy density, long service life, wide working temperature range, environmental friendliness and the like, and is widely applied to the fields of 3C digital products, electric tools, electric automobiles, aerospace and the like. Ternary materials have higher theoretical and practical gram capacities than commercial lithium cobalt oxide materials, and are becoming increasingly popular. In order to increase the energy density of the lithium ion battery, a common measure is to increase the nickel content in the ternary material, such as the commercialized ternary material from NCM111 to NCM422 to NCM523 to NCM622 to NCM811, and as the nickel content increases, the energy density of the battery can be further increased, but there are some negative effects, such as the material is too alkaline, and during the charge and discharge process, the lattice energy changes to cause the collapse of the material structure, ion dissolution and the like. The transition metal ions are separated from the crystal along with the progress of the reaction and enter the electrolyte to catalyze the decomposition of the electrolyte and damage the passivation film of the active material, meanwhile, the transition metal lithium ions also occupy a lithium ion migration channel of the passivation film on the surface of the anode material to block the migration of the lithium ions, so that the service life of the battery is influenced, and when the lithium ion battery is used in a high-temperature and high-pressure state, the negative influence is more obvious.
Currently, the main method for solving the above problems is to add a film forming additive to the electrolyte to improve the interface compatibility between the electrode and the electrolyte, thereby improving various performances of the battery. For example, the cycle characteristics of the battery are improved by adding conventional film-forming additives such as vinylene carbonate, vinyl acetate, vinyl sulfite, thiophene, etc. to the electrolyte. The film forming additive can generate decomposition reaction on the surface of the negative electrode in preference to solvent molecules, and can form a passivation film on the surface of the negative electrode to prevent electrolyte from further decomposing on the surface of the electrode, thereby improving the cycle performance of the battery. Conventional film-forming additives act mainly on the surface of the negative electrode, and the performance of the battery at high temperature mainly depends on the stability of the interface of the positive electrode, but conventional film-forming additives do not have the effect of stabilizing the positive electrode, so that an electrolyte capable of improving the high-temperature storage performance of the battery is needed.
Disclosure of Invention
Aiming at the problem that the high-temperature circulation and storage performance of the battery are affected due to the fact that the electrolyte does not have the function of stabilizing the positive electrode under the high-temperature condition of the existing battery, the invention provides a non-aqueous electrolyte and the battery.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in one aspect, the invention provides a nonaqueous electrolyte, which comprises an electrolyte salt, an organic solvent and an additive, wherein the additive comprises a phosphorus-containing compound, the phosphorus-containing compound comprises a compound A and/or a compound B, and the compound A is one or more of compounds shown as a structural formula I; the compound B is one or more of compounds shown in a structural formula II; wherein the R is 1 -R 6 From independently selected from the group consisting of siloxane substituents, C1-C20 alkyl, C1-C20 haloalkyl, C1-C20 alkoxy, C1-C20 haloalkoxy, C2-C20 alkenyl, C2-C20 haloalkenyl, C2-C20 alkenyloxy, C2-C20 haloalkenyloxy, C6-C20 aryl, C6-C20 haloaryl, C6-C20 aryloxy, C6-C20 haloaryloxy, amino, hydroxy, or halogen, and R 1 -R 6 At least one of the two is a siloxane substituent, the structure of the siloxane substituent is shown as a structural formula III, and the R is 7 -R 9 Each independently selected from the group consisting of C1-C20 alkyl, C1-C20 haloalkyl, C1-C20 alkoxy, C1-C20 haloalkoxy, C2-C20 alkenyl, C2-C20 haloalkenyl, C2-C20 alkenyloxy, C2-C20 haloalkenyloxy, C6-C20 aryl, C6-C20 haloaryl, C6-C20 aryloxy, C6-C20 haloaryloxy, amino, hydroxy, or halogen;
optionally, the phosphorus-containing compound is selected from one or more of structural formulas a-H:
optionally, the content of the phosphorus-containing compound is 0.1% -5% based on 100% of the mass of the nonaqueous electrolytic solution.
Optionally, the content of the phosphorus-containing compound is 0.5% -2% based on 100% of the mass of the nonaqueous electrolytic solution.
Optionally, the additive further comprises a first additive comprising one or more of lithium difluorooxalato borate, lithium dioxaato borate, lithium difluorophosphate, lithium tetrafluoroborate and lithium bis (fluorosulfonyl) imide.
Optionally, the content of the first additive is 0.1% -5% based on 100% of the mass of the nonaqueous electrolyte.
Optionally, the content of the first additive is 0.5% -1% based on 100% of the mass of the nonaqueous electrolyte.
Optionally, the electrolyte salt comprises MClO 4 、MBF 4 、MPF 6 、MAsF 6 、MPF 2 O 2 、MCF 3 SO 3 、M2H2P2O7、MB(C 2 O 4 ) 2 、MBF 2 C 2 O 4 、M[(CF 3 SO 2 ) 2 N]、M[(FSO 2 ) 2 N]And M [ (CmF) 2m+1 SO 2 )(C n F 2n+1 SO 2 )N]Wherein M is Li, na or K, and M and n are natural numbers.
Alternatively, the molar concentration of the electrolyte salt in the nonaqueous electrolytic solution is 0.01 to 8.0mol/L.
Optionally, the additive further comprises a second additive comprising one or more of fluoroethylene carbonate, biphenyl, fluorobenzene, vinylene carbonate, trifluoromethylethylene carbonate, ethylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, ethylene sulfate, ethylene sulfite, succinonitrile, adiponitrile, 1, 2-bis (2-cyanoethoxy) ethane and 1,3, 6-hexane tricarbonitrile.
Optionally, the organic solvent comprises one or more of carbonate solvents, ether solvents and carboxylic acid ester solvents.
In another aspect, the present invention provides a battery comprising a positive electrode, a negative electrode, a separator, and the nonaqueous electrolyte as described in any one of the above.
Optionally, the negative electrode includes one or more of a carbon-based negative electrode, a silicon-based negative electrode, a tin-based negative electrode, a lithium negative electrode, a sodium negative electrode, a potassium negative electrode, a magnesium negative electrode, a zinc negative electrode, and an aluminum negative electrode.
Optionally, the carbon-based negative electrode comprises one or more of graphite, hard carbon, soft carbon and graphene; the silicon-based anode comprises one or more of silicon, silicon carbon, silicon oxygen and silicon metal compounds; the tin-based negative electrode comprises one or more of tin, tin carbon, tin oxygen and a tin metal compound; the lithium negative electrode includes metallic lithium or a lithium alloy.
Optionally, the lithium alloy includes one or more of lithium silicon alloy, lithium sodium alloy, lithium potassium alloy, lithium aluminum alloy, lithium tin alloy, and lithium indium alloy.
In the invention, the phosphorus-containing compound is preferentially oxidized and decomposed to form a stable positive electrode-electrolyte interface phase (CEI), so that continuous decomposition of electrolyte, dissolution of transition metal, surface phase change and gas generation are effectively inhibited, and the high-temperature stability of the electrolyte is improved. In addition, the phosphorus-containing compound can effectively remove trace H in the electrolyte 2 O/HF, further improves the high temperature stability of the electrolyte. Thereby greatly improving the high-temperature cycle and high-temperature storage performance of the battery.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
An embodiment of the present invention provides a nonaqueous electrolyte solution, which includes an electrolyte salt, an organic solvent, and an additive including a phosphorus-containing compound including a compound a and/or a compound B, wherein the compound a is one or more of compounds represented by structural formula I. The compound B is one or more of compounds shown in a structural formula II. Wherein the R is 1 -R 6 From independently selected from the group consisting of siloxane substituents, C1-C20 alkyl, C1-C20 haloalkyl, C1-C20 alkoxy, C1-C20 haloalkoxy, C2-C20 alkenyl, C2-C20 haloalkenyl, C2-C20 alkenyloxy, C2-C20 haloalkenyloxy, C6-C20 aryl, C6-C20 haloaryl, C6-C20 aryloxy, C6-C20 haloaryloxy, amino, hydroxy, or halogen, and R 1 -R 6 At least one of the two is a siloxane substituent, the structure of the siloxane substituent is shown as a structural formula III, and the R is 7 -R 9 Each independently selected from the group consisting of C1-C20 alkyl, C1-C20 haloalkyl, C1-C20 alkoxy, C1-C20 haloalkoxy, C2-C20 alkenyl, C2-C20 haloalkenyl, C2-C20 alkenyloxy, C2-C20 haloalkenyloxy, C6-C20 aryl, C6-C20 haloaryl, C6-C20 aryloxy, C6-C20 haloaryloxy, amino, hydroxy, or halogen.
In the invention, the phosphorus-containing compound is oxidized and decomposed to form a stable positive electrode-electrolyte interface phase (CEI), so that continuous decomposition of electrolyte, dissolution of transition metal, surface phase change and gas generation are effectively inhibited, and the high-temperature stability of the electrolyte is improved. In addition, the phosphorus-containing compound can effectively remove trace H in the electrolyte 2 O/HF, further improves the high temperature stability of the electrolyte. Thereby greatly improving the high-temperature cycle and high-temperature storage performance of the battery.
In some embodiments, the phosphorus-containing compound is selected from one or more of structural formulas a-H:
in some embodiments, the phosphorous-containing compound is present in an amount of 0.1% to 5% based on 100% by mass of the nonaqueous electrolytic solution.
In a preferred embodiment, the content of the phosphorus-containing compound is 0.5% -2% based on 100% of the mass of the nonaqueous electrolytic solution.
In one embodiment, the phosphorous-containing compound is present in an amount of 0.1%, 0.5%, 1%, 1.5%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%.
In some embodiments, the additive further comprises a first additive comprising one or more of lithium difluorooxalato borate, lithium dioxaato borate, lithium difluorophosphate, lithium tetrafluoroborate, and lithium bis (fluorosulfonyl) imide. The phosphorus-containing compound is combined with the second additive of lithium salt, and is preferentially oxidized and decomposed at the positive electrode to form a stable positive electrode-electrolyte interface phase (CEI), so that the high-temperature stability of the electrolyte is improved.
In some embodiments, the first additive is present in an amount of 0.1% to 5% based on 100% by mass of the nonaqueous electrolyte.
In a preferred embodiment, the first additive is contained in an amount of 0.5% to 1% based on 100% by mass of the nonaqueous electrolytic solution.
In a specific embodiment, the first additive is present in an amount of 0.1%, 0.5%, 1%, 1.5%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%.
In some embodiments, the electrolyte salt comprises MClO 4 、MBF 4 、MPF 6 、MAsF 6 、MPF 2 O 2 、MCF 3 SO 3 、M2H2P2O7、MB(C 2 O 4 ) 2 、MBF 2 C 2 O 4 、M[(CF 3 SO 2 ) 2 N]、M[(FSO 2 ) 2 N]And M [ (CmF) 2m+1 SO 2 )(C n F 2n+1 SO 2 )N]Wherein M is Li, na or K, and M and n are natural numbers.
In some embodiments, the electrolyte salt is present in the nonaqueous electrolyte solution at a molar concentration of 0.01 to 8.0mol/L.
In some embodiments, the additive further comprises a second additive comprising one or more of fluoroethylene carbonate (FEC), biphenyl, fluorobenzene, vinylene carbonate, trifluoromethylcarbonate, ethylene carbonate, 1, 3-Propane Sultone (PS), 1, 4-butane sultone, ethylene sulfate, ethylene sulfite, succinonitrile (SN), adiponitrile, 1, 2-bis (2-cyanoethoxy) ethane, and 1,3, 6-hexane tricarbonitrile.
In some embodiments, the second additive is present in an amount no greater than 10%.
In some embodiments, the organic solvent comprises one or more of a carbonate solvent, an ether solvent, a carboxylate solvent.
In another aspect, an embodiment of the present invention provides a battery including a positive electrode, a negative electrode, a separator, and the nonaqueous electrolytic solution described in any one of the above.
In some embodiments, the negative electrode comprises one or more of a carbon-based negative electrode, a silicon-based negative electrode, a tin-based negative electrode, a lithium negative electrode, a sodium negative electrode, a potassium negative electrode, a magnesium negative electrode, a zinc negative electrode, and an aluminum negative electrode.
In some embodiments, the carbon-based negative electrode comprises one or more of graphite, hard carbon, soft carbon, graphene. The silicon-based negative electrode comprises one or more of silicon, silicon carbon, silicon oxygen and silicon metal compounds. The tin-based negative electrode comprises one or more of tin, tin carbon, tin oxygen and tin metal compounds. The lithium negative electrode includes metallic lithium or a lithium alloy.
In some embodiments, the lithium alloy includes one or more of a lithium silicon alloy, a lithium sodium alloy, a lithium potassium alloy, a lithium aluminum alloy, a lithium tin alloy, and a lithium indium alloy.
The invention is further illustrated by the following examples.
Lithium difluorooxalato borate (LiODFB), lithium difluorooxalato borate (LiBOB), lithium difluorophosphate (LiPO) 2 F 2 ) Respectively marked as ODFB, BOB, PO 2 F 2 。
Example 1
This example is for illustrating the nonaqueous electrolyte and the battery disclosed by the invention, and comprises the following operation steps:
preparation of nonaqueous electrolyte
Mixing Ethylene Carbonate (EC), diethyl carbonate (DEC) and methyl ethyl carbonate (EMC) to form an organic solvent, adding lithium hexafluorophosphate (LiPF) 6 ) A mixed solution was prepared, and then additives of the corresponding kinds and contents in table 1 were added to the mixed solution to prepare an electrolyte. Wherein, liPF 6 The concentration is 1.1mol/L, and the mass percentages of EC, DEC, EMC are 20:70:10.
manufacturing a positive plate:
the ternary main material (NCM 811) of the positive electrode active material, the conductive agent super P and the binder polyvinylidene fluoride (PVDF) are fully stirred and mixed in an N-methyl pyrrolidone (NMP) solvent according to the weight ratio of 96:2:2, so that uniform positive electrode slurry is formed. And (3) coating the slurry on an anode current collector Al foil, drying, and cold pressing to obtain the anode plate.
Manufacturing a negative plate:
and (3) fully stirring and mixing the negative electrode active material graphite, the conductive agent acetylene black, the adhesive styrene-butadiene rubber and the thickener sodium carboxymethyl cellulose in a proper amount of deionized water solvent according to a mass ratio of 95:2:2:1, so that uniform negative electrode slurry is formed. And (3) coating the slurry on a negative current collector Cu foil, drying, and cold pressing to obtain a negative electrode plate.
Manufacturing a lithium ion battery:
and sequentially stacking the positive electrode plate, the isolating film and the negative electrode plate, so that the isolating film is positioned between the positive electrode plate and the negative electrode plate, plays an isolating role, and then winds the bare cell. And placing the bare cell in an outer packaging bag, injecting the prepared electrolyte into the dried battery, and performing the procedures of vacuum packaging, standing, formation, shaping and the like to finish the preparation of the battery.
Examples 2 to 21
Examples are provided to illustrate the non-aqueous electrolyte and battery of the present disclosure, including most of the operating steps of example 1, with the difference that: the formulation in table 1 was used.
Comparative examples 1 to 7
Comparative examples are illustrative of the disclosed nonaqueous electrolyte and battery, including most of the operating steps of example 1, with the difference that: the formulation in table 1 was used.
TABLE 1
Performance testing
1. The following performance tests were performed on the batteries prepared in the above examples and comparative examples:
and (3) after the battery is placed at 45+/-2 ℃ for 2 hours, the battery is cycled according to standard charge and discharge, the cycle rate is 1C, and the charge voltage is 3.0-4.45V, and the capacity retention rate of the battery after cycling is calculated. The calculation formula is as follows:
nth cycle capacity retention (%) = (nth cycle discharge capacity)/(first cycle discharge capacity) ×100%
High temperature storage test of battery
The testing method comprises the following steps: and (3) charging at 25+/-3 ℃ according to the standard, wherein the charging multiplying power is 0.5 ℃, the charging voltage is 3.0-4.45V, and after full charging, the battery is stored at 60+/-2 ℃ for 30D, and the thickness expansion rate of the battery after storage is calculated every 7D. The calculation formula is as follows:
the thickness expansion ratio (%) = (measured battery thickness after storage-initial thickness)/(initial thickness) ×100% test results are shown in table 2.
TABLE 2
As can be seen from examples 1 to 4, 11 to 21 and comparative examples 1 to 4, the electrolyte cycle performance and the high temperature storage performance without using the additive are not good, and the addition of the phosphorus-containing compound A to D or the lithium salt additive alone improves both the high temperature cycle and the high temperature storage performance, and the performance is excellent. The combination of the phosphorus-containing compound and the first additive can further improve the high-temperature circulation and high-temperature storage performance to the greatest extent.
From the test data of examples 5-10, it can be seen that when the content of the phosphorus-containing compound exceeds 5% or falls below 0.1%, the performance is reduced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. The nonaqueous electrolyte is characterized by comprising electrolyte salt, an organic solvent and an additive, wherein the additive comprises a phosphorus-containing compound, the phosphorus-containing compound comprises a compound A and/or a compound B, and the compound A is one or more of compounds shown in a structural formula I; the compound B is one or more of compounds shown in a structural formula II; wherein the R is 1 -R 6 From independently selected from the group consisting of siloxane substituents, C1-C20 alkyl, C1-C20 haloalkyl, C1-C20 alkoxy, C1-C20 haloalkoxy, C2-C20 alkenyl, C2-C20 haloalkenyl, C2-C20 alkenyloxy, C2-C20 haloalkenyloxy, C6-C20 aryl, C6-C20 haloaryl, C6-C20 aryloxy, C6-C20 haloaryloxy, amino, hydroxy, or halogen, and R 1 -R 6 At least one of the two is a siloxane substituent, the structure of the siloxane substituent is shown as a structural formula III, and the R is 7 -R 9 Each independently selected from the group consisting of C1-C20 alkyl, C1-C20 haloalkyl, C1-C20 alkoxy, C1-C20 haloalkoxy, C2-C20 alkenyl, C2-C20 haloalkenyl, C2-C20 alkenyloxy, C2-C20 haloalkenyloxy, C6-C20 aryl, C6-C20 haloaryl, C6-C20 aryloxy, C6-C20 haloaryloxy, amino, hydroxy, or halogen;
2. the non-aqueous electrolyte of claim 1, wherein the phosphorus-containing compound is selected from one or more of structural formula a-structural formula H:
3. the nonaqueous electrolytic solution according to claim 2, wherein the content of the phosphorus-containing compound is 0.1% to 5% based on 100% by mass of the nonaqueous electrolytic solution.
4. The nonaqueous electrolytic solution according to claim 3, wherein the content of the phosphorus-containing compound is 0.5% to 2% based on 100% by mass of the nonaqueous electrolytic solution.
5. The non-aqueous electrolyte of claim 1, wherein the additive further comprises a first additive comprising one or more of lithium difluoroborate, lithium difluorophosphate, lithium tetrafluoroborate, and lithium bis (fluorosulfonyl) imide.
6. The nonaqueous electrolytic solution according to claim 1, wherein the content of the first additive is 0.1% to 5% based on 100% by mass of the nonaqueous electrolytic solution.
7. The nonaqueous electrolyte according to claim 1A liquid, characterized in that the electrolyte salt comprises MClO 4 、MBF 4 、MPF 6 、MAsF 6 、MPF 2 O 2 、MCF 3 SO 3 、M 2 H 2 P 2 O 7 、MB(C 2 O 4 ) 2 、MBF 2 C 2 O 4 、M[(CF 3 SO 2 ) 2 N]、M[(FSO 2 ) 2 N]And M [ (CmF) 2m+1 SO 2 )(C n F 2n+1 SO 2 )N]Wherein M is Li, na or K, and M and n are natural numbers.
8. The nonaqueous electrolytic solution according to claim 7, wherein a molar concentration of the electrolyte salt in the nonaqueous electrolytic solution is 0.01 to 8.0mol/L.
9. The non-aqueous electrolyte of claim 1 wherein the additive further comprises a second additive comprising one or more of fluoroethylene carbonate, biphenyl, fluorobenzene, vinylene carbonate, trifluoromethylcarbonate, ethylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, vinyl sulfate, vinyl sulfite, succinonitrile, adiponitrile, 1, 2-bis (2-cyanoethoxy) ethane, and 1,3, 6-hexane-tri-nitrile.
10. A battery comprising a positive electrode, a negative electrode, a separator, and the nonaqueous electrolytic solution according to any one of claims 1 to 8.
CN202310759201.9A 2023-06-26 2023-06-26 Nonaqueous electrolyte and battery Pending CN117293388A (en)

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