CN116154108B - Secondary battery and electricity utilization device comprising same - Google Patents

Secondary battery and electricity utilization device comprising same Download PDF

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Publication number
CN116154108B
CN116154108B CN202310326821.3A CN202310326821A CN116154108B CN 116154108 B CN116154108 B CN 116154108B CN 202310326821 A CN202310326821 A CN 202310326821A CN 116154108 B CN116154108 B CN 116154108B
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silicon
secondary battery
electrolyte
negative electrode
mass
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CN116154108A (en
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简俊华
彭谢学
郭和峰
唐超
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Ningde Amperex Technology 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/134—Electrodes based on metals, Si or alloys
    • 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
    • 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
    • H01M10/056—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/386—Silicon or alloys based on silicon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • 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
    • 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
    • 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

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Abstract

The application provides a secondary battery and an electric device comprising the secondary battery, wherein the secondary battery comprises a positive electrode plate, a negative electrode plate and electrolyte, the negative electrode plate comprises a negative electrode material layer, the negative electrode material layer comprises a silicon-containing substance, silicon elements are contained in particles of the silicon-containing substance, the mass percentage B of the silicon elements is 5-85% based on the mass of the silicon-containing substance, the electrolyte comprises one or more fluoro-sulfonamide compounds represented by the formula (I), and the mass percentage A of fluoro-sulfonamide is 10-80% based on the mass of the electrolyte. The negative electrode plate and the electrolyte in the secondary battery provided by the application meet the characteristics, and the cycle performance and the high-temperature storage performance of the secondary battery can be remarkably improved.

Description

Secondary battery and electricity utilization device comprising same
Technical Field
The present disclosure relates to the field of electrochemical technology, and in particular, to a secondary battery and an electrical device including the secondary battery.
Background
With the rapid development of electronic products, secondary batteries are widely used in mobile phones, notebook computers, tablet computers, unmanned aerial vehicles, electric tools, power storage systems and the like due to the advantages of high energy density, miniaturization, light weight and the like. Particularly in the field of 3C products, consumer users still have great demands for improvement of endurance of electronic products, so that higher demands are put on energy density of secondary batteries.
In order to further increase the energy density of the secondary battery, it is necessary to use an electrode material having a high specific capacity. The silicon-based material is used as an alloying type negative electrode material, can provide ultra-high specific capacity of up to 4200mAh/g, and therefore has great potential for improving energy density. However, the lithium silicon alloy is formed after the silicon-based material is lithiated, and has high reactivity, so that solvent molecules in the electrolyte are extremely easy to attack, and the electrolyte is rapidly consumed and active lithium is lost, so that the problems of poor cycle performance and poor high-temperature storage performance can be caused.
Disclosure of Invention
The present application is directed to a secondary battery and an electric device including the same for improving cycle performance and high temperature storage performance of the secondary battery. The specific technical scheme is as follows:
the application provides a secondary battery, which comprises a positive electrode plate, a negative electrode plate and electrolyte, wherein the negative electrode plate comprises a negative electrode material layer, the negative electrode material layer comprises a silicon-containing substance, silicon elements are included in particles of the silicon-containing substance, and the mass percentage B of the silicon elements is 5-85% based on the mass of the silicon-containing substance;
the electrolyte comprises one or more of fluoro sulfonamide compounds represented by the formula (I):
wherein R is 1 Selected from fluorine atoms, all or part of fluorine substituted C 1 To C 10 C substituted by alkyl, whole or part of fluorine 6 To C 10 Aryl, all or part of fluorine substituted C 1 To C 10 C substituted by oxyalkyl, total or partial fluorine 6 To C 10 An oxygen-containing aryl group of (a); the R is 1 Wherein the O atom is not directly connected with the S atom; r is R 2 And R is 3 Each independently selected from substituted or unsubstituted C 1 To C 5 Alkyl, substituted or unsubstituted C 6 To C 10 Aryl of said substituted C 1 To C 5 The substituents in the alkyl group of (2) are fluorine atoms, the substituted C 6 To C 10 Wherein the substituent in the aryl group is a fluorine atom;
the mass percentage A of the fluoro-sulfonamide is 10-80% based on the mass of the electrolyte.
The negative electrode plate and the electrolyte in the secondary battery provided by the application meet the characteristics, and the cycle performance and the high-temperature storage performance of the secondary battery can be remarkably improved.
In some embodiments of the present application, the electrolyte further comprises a cyclic ester; the cyclic ester comprises at least one of ethylene carbonate, propylene carbonate, trimethylene carbonate, ethylene sulfate, propylene sulfate or 1, 3-propanediol cyclosulfate, and the fluoro sulfonamide is 10 to 70% by mass, based on the mass of the electrolyte, of C. The addition of the above cyclic ester to the electrolyte of the present application is advantageous in promoting dissolution and dissociation of lithium salts.
In some embodiments of the present application, the electrolyte further comprises a fluorinated solvent, the fluorinated solvent having a mass percentage E of 5% to 35%, the fluorinated solvent comprising at least one of fluoroethylene carbonate, bis-fluoroethylene carbonate, trifluoromethylethylene carbonate, trifluoroethanol acetate, or difluoroethanol acetate, and the fluorinated sulfonamide having a mass percentage a of 10% to 65%, based on the mass of the electrolyte. The addition of the fluorinated solvent to the electrolyte is beneficial to improving the cycle performance of the secondary battery.
In some embodiments of the present application, the elemental silicon mass percentage B is 5% to 65% based on the mass of the silicon-containing species. By controlling the mass percentage of the silicon element within the above range, the energy density of the secondary battery can be further improved.
In some embodiments of the present application, the silicon-containing species comprises a silicon-oxygen composite or a silicon-carbon composite, the silicon-oxygen composite or silicon-carbon composite particle surface comprising LiF, alF 3 、Li 2 CO 3 At least one of amorphous carbon or graphitized carbon. By selecting the above silicon-containing materials, a secondary battery can be given more excellent overall performance.
In some embodiments of the present application, p1=a/B, and the value of P1 is 0.1 to 2, preferably 0.5 to 2. By regulating the value of P1 within the above range, the cycle performance and the high-temperature storage performance of the secondary battery can be improved.
In some embodiments of the present application, p2=a/C, and P2 has a value of 1 to 7. By regulating the value of P2 within the above range, the cycle performance and the high-temperature storage performance of the secondary battery can be further improved.
In some embodiments of the present application, the a is 20% to 60%. By regulating the value of a within the above range, the cycle performance and the high-temperature storage performance of the secondary battery can be further improved.
The present application includes an electrical device comprising a secondary battery in any of the foregoing embodiments. Thus, the power utilization device provided by the application has high energy density, good cycle life and high-temperature storage performance.
The beneficial effects of the application are that:
the application provides a secondary battery and an electric device comprising the secondary battery, wherein the secondary battery comprises a positive electrode plate, a negative electrode plate and electrolyte, the negative electrode plate comprises a negative electrode material layer, the negative electrode material layer comprises a silicon-containing substance, silicon elements are contained in particles of the silicon-containing substance, the mass percentage B of the silicon elements is 5-85% based on the mass of the silicon-containing substance, the electrolyte comprises one or more fluoro-sulfonamide compounds represented by the formula (I), and the mass percentage A of fluoro-sulfonamide is 10-80% based on the mass of the electrolyte. The negative electrode plate and the electrolyte in the secondary battery provided by the application meet the characteristics, and the cycle performance and the high-temperature storage performance of the secondary battery can be remarkably improved.
Of course, not all of the above-described advantages need be achieved simultaneously in practicing any one of the products or methods of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.
In the following, the present application will be explained with reference to a lithium ion battery as an example of a secondary battery, but the secondary battery of the present application is not limited to a lithium ion battery. The specific technical scheme is as follows:
the first aspect of the application provides a secondary battery, which comprises a positive electrode plate, a negative electrode plate and electrolyte, wherein the negative electrode plate comprises a negative electrode material layer, the negative electrode material layer comprises a silicon-containing substance, silicon elements are contained in particles of the silicon-containing substance, and the mass percentage B of the silicon elements is 5-85% based on the mass of the silicon-containing substance;
the electrolyte includes one or more of fluorosulfonamide compounds represented by formula (I):
wherein R is 1 Selected from fluorine atoms, all or part of fluorine substituted C 1 To C 10 C substituted by alkyl, whole or part of fluorine 6 To C 10 Aryl, all or part of fluorine substituted C 1 To C 10 C substituted by oxyalkyl, total or partial fluorine 6 To C 10 An oxygen-containing aryl group of (a); r is R 1 Wherein the O atom is not directly connected with the S atom; r is R 2 And R is 3 Each independently selected from substituted or unsubstituted C 1 To C 5 Alkyl, substituted or unsubstituted C 6 To C 10 Aryl of said substituted C 1 To C 5 The substituents in the alkyl group of (2) are fluorine atoms, the substituted C 6 To C 10 Wherein the substituent in the aryl group is a fluorine atom;
the mass percentage A of the fluoro-sulfonamide is 10 to 80 percent based on the mass of the electrolyte.
Specifically, the mass percentage B of the silicon element may be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85% or a range of any two of the above numerical values. Preferably, B is 5% to 65%. Specifically, the mass percentage a of the fluorosulfonamide compound may be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% or a range composed of any two of the above values. Preferably, a is 20% to 60%.
When the mass percentage of silicon element is too low, for example, less than 5%, the energy density of the secondary battery is relatively low; when the silicon element mass percentage is too high, for example, higher than 85%, the expansion of the secondary battery is large, resulting in poor cycle performance. Without being limited by any theory, by controlling the mass percentage B of the silicon element within the above range, the energy density of the secondary battery can be greatly improved, and meanwhile, the problem of expansion deformation of the anode material layer caused by lithiation of the silicon element can be controlled through pole piece engineering, so that the failure of the structural layer of the secondary battery is not caused.
Without being limited by any theory, the fluoro sulfonamide compound shown in the formula (I) can reduce the attack of active lithium silicon alloy generated after lithium intercalation of a silicon-based material on an electrolyte solvent, delay the consumption of the electrolyte and effectively improve the cycle life of a secondary battery; the accumulation of the interface byproducts can be slowed down, and the expansion of the secondary battery in the circulating process can be effectively restrained; further, since the stability of the electrolyte is enhanced, the problem of high-temperature gas generation of the secondary battery can be also improved. When the mass percentage of the fluorosulfonamide compound is too low, for example, less than 10%, the secondary battery is inferior in cycle performance and serious in high-temperature gas generation; when the mass percentage of the fluorosulfonamide compound is too high, for example, higher than 80%, the effect of the single component is limited, and more improved properties can be obtained by adding the cyclic ester and the fluorosolvent. Without being limited to any theory, by controlling the mass percentage a of the fluorosulfonamide compound within the above-described range, it is more advantageous to improve the cycle performance of the secondary battery while achieving a balance of the lithium salt dissociation degree, viscosity, and conductivity of the electrolyte.
Illustratively, the fluorosulfonamide compound represented by the formula (I) is selected from at least one of the following formulas (I-1) to (I-32):
。
the electrolyte further includes linear carbonate and/or linear carboxylate, the mass percentage D of which is 4% to 75% based on the mass of the electrolyte, and the linear carbonate may include, but is not limited to, at least one of dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, methylethyl carbonate, ethylene carbonate, propylene carbonate, butylene carbonate, vinyl ethylene carbonate, fluoroethylene carbonate, 1, 2-difluoroethylene carbonate, 1, 2-trifluoroethylene carbonate, 1, 2-tetrafluoroethylene carbonate, 1-fluoro-2-methylethylene carbonate, 1-fluoro-1-methylethylene carbonate, 1, 2-difluoro-1-methylethylene carbonate, 1, 2-trifluoro-2-methylethylene carbonate, or trifluoromethyl ethylene carbonate; the linear carboxylic acid esters may include, but are not limited to, at least one of methyl formate, methyl acetate, ethyl acetate, n-propyl acetate, t-butyl acetate, methyl propionate, ethyl propionate, propyl propionate, gamma-butyrolactone, decalactone, valerolactone, mevalonic acid lactone, or caprolactone. Without being limited to any theory, by selecting the above linear carbonate and/or linear carboxylate, the viscosity of the electrolyte may be reduced, ensuring the ionic conductivity of the electrolyte.
The electrolyte further includes a lithium salt, the mass percentage of which is 10% to 20% based on the mass of the electrolyte, and the lithium salt may include, but is not limited to, one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium dioxaborate, lithium difluorooxalato borate, lithium tetraborate, lithium perchlorate, lithium difluorophosphate, lithium difluorodioxaoxalato phosphate, lithium difluorosulfimide, or lithium bistrifluoromethylsulfonimide. By selecting the above lithium salt, the electrolyte can obtain a suitable ionic conductivity.
Therefore, the secondary battery provided by the application can remarkably improve the cycle performance and the high-temperature storage performance of the secondary battery by selecting the fluoro-sulfonamide compound represented by the formula (I) and regulating and controlling the mass percentage of the compound and the mass percentage of the silicon element within the ranges.
In some embodiments of the present application, the electrolyte further comprises a cyclic ester; based on the mass of the electrolyte, the mass percentage C of the cyclic ester is 10-50%, the cyclic ester comprises at least one of ethylene carbonate, propylene carbonate, trimethylene carbonate, ethylene sulfate, propylene sulfate or 1, 3-propylene glycol cyclosulfate, and the mass percentage A of the fluoro-sulfonamide is 10-70%. Specifically, the mass percentage C of the cyclic ester may be 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50% or a range of any two of the above numerical values. Specifically, the mass percentage a of the fluorosulfonamide may be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70% or a range of any two of the above numerical values. Without being limited to any theory, the above cyclic esters have a high capacity to dissolve cations and lewis bases (DN value) and a dielectric constant, and the percentage content of the cyclic esters is controlled within the above range, helping to promote dissolution and dissociation of lithium salts. The electrolyte also comprises linear carbonate and/or linear carboxylate, wherein the mass percentage D of the linear carbonate and/or the linear carboxylate is 4-70% based on the mass of the electrolyte; the electrolyte further comprises lithium salt, and the mass percentage of the lithium salt is 10-20% based on the mass of the electrolyte.
In some embodiments of the present application, the electrolyte further comprises a fluorinated solvent, the fluorinated solvent having a mass percentage E of 5% to 35% based on the mass of the electrolyte, the fluorinated solvent comprising at least one of fluoroethylene carbonate, difluoroethylene carbonate, trifluoromethylethylene carbonate, trifluoroethanol acetate, or difluoroethanol acetate, and the fluorinated sulfonamide having a mass percentage a of 10% to 65%. Specifically, the mass percentage E of the fluorinated solvent may be 5%, 10%, 15%, 20%, 25%, 30%, 35% or a range composed of any two of the above values. Specifically, the mass percentage a of the fluorosulfonamide may be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65% or a range composed of any two of the above values. Without being limited to any theory, by controlling the percentage content of the fluorinated solvent within the above range, since the fluorinated solvent has a reduction reaction potential of more than 0.5V and a lithium fluoride product is easily generated, the interface passivation effect is assisted, and the reaction of the lithium silicon alloy and the electrolyte can be further suppressed, so that the secondary battery can obtain a more excellent cycle life. The electrolyte also comprises cyclic ester, wherein the mass percentage C of the cyclic ester is 10-50% based on the mass of the electrolyte; the electrolyte also comprises linear carbonate and/or linear carboxylate, wherein the mass percentage D of the linear carbonate and/or linear carboxylate is 4-65% based on the mass of the electrolyte; the electrolyte further comprises lithium salt, and the mass percentage of the lithium salt is 10-20% based on the mass of the electrolyte.
In the present application, a silicon-containing substance refers to a material having electrochemical activity in the form of any substance composition containing elemental silicon, which can contribute reversible capacity by intercalation and deintercalation of lithium. The silicon-containing material is not particularly limited, and may be, for example, silicon nanoparticles, silicon nanowires, microsilicon, silicon oxide composites (SiO x X is 0 to 2), silicon-carbon composite material (SiC) or silicon-containing alloy (silicon-tin alloy, silicon-magnesium alloy or silicon-aluminum alloy), wherein the silicon-containing substance can be LiF or AlF on the surface 3 、Li 2 CO 3 A silicon-containing material of at least one of amorphous carbon or graphitized carbon. In some embodiments of the present application, the silicon-containing species comprises a silicon-oxygen composite or a silicon-carbon composite, and the surface of the silicon-oxygen composite or silicon-carbon composite particles comprises LiF, alF 3 、Li 2 CO 3 At least one of amorphous carbon or graphitized carbon. Without being limited by any theory, the silicon-containing substances are selected, so that the processing of the cathode slurry and the pole piece is simpler and more convenient, and the secondary battery has better comprehensive performance.
In some embodiments of the present application, p1=a/B and P1 has a value of 0.1 to 2. For example, P1 may be 0.1, 0.2, 0.4, 0.6, 0.8, 1, 1.2, 1.4, 1.6, 1.8, 2 or a range of any two of the foregoing values. Preferably, the value of P1 is from 0.5 to 2. Without being limited to any theory, by controlling the value of P1 within the above-described range, the possibility of attack of the lithium silicon alloy generated after lithium intercalation of the silicon material on the electrolyte solvent can be reduced to a large extent, while balancing the properties of the electrolyte such as viscosity and conductivity.
In some embodiments of the present application, p2=a/C, and P2 has a value of 1 to 7. For example, P2 may be 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7 or a range of any two of the values recited above. Without being limited to any theory, by controlling the value of P2 within the above range, the cyclic ester has the property of reducing and decomposing into a film, which contributes to the formation of an organic Solid Electrolyte Interface (SEI) film, further inhibits the decomposition reaction of the solvent, and thus enables the electrolyte to obtain better interface stability.
In the present application, the electrolyte further includes an additive, the kind of which is not particularly limited, and additives known in the art may be used. For example, the additive may include, but is not limited to, one or more of 1, 3-propane sultone, glutaronitrile, methylglutaronitrile, adiponitrile, pimelic acid dinitrile, octadinitrile, 1,3, 5-pentanetrianitrile, 1,3, 6-hexanetrinitrile or 1,2, 3-tris (2-cyanooxy) propane. Without being limited to any theory, by selecting the above additives, side reactions between the positive electrode and the electrolyte at high voltage can be suppressed, further optimizing the overall performance of the secondary battery.
In the present application, the electrolyte further includes other nonaqueous solvents, and the present application is not particularly limited as long as the object of the present application can be achieved. For example, other nonaqueous solvents may include, but are not limited to, at least one of dibutyl ether, tetraglyme, diglyme, 1, 2-dimethoxyethane, 1, 2-diethoxyethane, ethoxymethoxyethane, 2-methyltetrahydrofuran or tetrahydrofuran, dimethyl sulfoxide, 1, 2-dioxolane, sulfolane, methyl sulfolane, 1, 3-dimethyl-2-imidazolidinone, N-methyl-2-pyrrolidone, formamide, dimethylformamide, acetonitrile, trimethyl phosphate, triethyl phosphate, trioctyl phosphate, or phosphoric acid esters.
The present application is not particularly limited to a method of preparing a silicon-containing substance, and illustratively, the method of preparing a silicon-containing substance may include, but is not limited to, the steps of: and dissolving the silicon material and lithium nitrate in a solvent, uniformly mixing, drying to obtain a powder material, and then carrying out heat treatment on the powder material in a carbon-containing gas to obtain the silicon-containing substance. Wherein the temperature of the drying is 80-120 ℃; the temperature of the heat treatment is 300-800 ℃, the heating rate of the heat treatment is 1-10 ℃/min, and the heat preservation time of the heat treatment is 0.5-6 h; the mass ratio of the silicon material to the lithium nitrate can be (10 to 200) to 1; the silicon material may be a silicon carbon material, a silicon oxygen material or a pre-lithiated silicon oxygen material; the solvent may include, but is not limited to, at least one of ethanol, water, or acetone; the carbon-containing gas comprises at least one of acetylene, methane or propylene; the mass ratio of the powder material to the carbon-containing gas may be (20 to 100) to 1. In the application, the mass percentage of the silicon element in the silicon-containing substance can be regulated by regulating the mass ratio of the silicon material to the lithium nitrate.
In the present application, the secondary battery further includes a positive electrode tab including a positive electrode current collector and a positive electrode material layer disposed on at least one surface of the positive electrode current collector. The above-mentioned "positive electrode material layer disposed on at least one surface of the positive electrode current collector" means that the positive electrode material layer may be disposed on one surface of the positive electrode current collector in the thickness direction thereof, or may be disposed on both surfaces of the positive electrode current collector in the thickness direction thereof. The "surface" here may be the entire region of the positive electrode current collector or may be a partial region of the positive electrode current collector, and the present application is not particularly limited as long as the object of the present application can be achieved.
The positive electrode current collector is not particularly limited as long as the object of the present application can be achieved, and may include, for example, an aluminum foil, an aluminum alloy foil, a composite current collector (for example, an aluminum-carbon composite current collector), or the like.
The positive electrode material layer includes a positive electrode active material, which is not particularly limited as long as the object of the present application can be achieved, for example, the positive electrode active material may include, but is not limited to, nickel cobalt lithium manganate (such as common NCM811, NCM622, NCM523, NCM 111), nickel cobalt lithium aluminate, iron lithium phosphate, lithium-rich manganese-based material, lithium cobaltate (LiCoO) 2 ) At least one of lithium manganate, lithium iron manganese phosphate or lithium titanate. In the present application, the positive electrode active material may further contain a non-metal element, for example, at least one of fluorine, phosphorus, boron, chlorine, silicon, or sulfur, which further improves the stability of the positive electrode active material.
The positive electrode material layer further includes a conductive agent and a binder, and the kind of the conductive agent and the binder is not particularly limited as long as the object of the present application can be achieved, and for example, the conductive agent may include, but is not limited to, at least one of conductive carbon black (Super P), carbon Nanotubes (CNTs), carbon fibers, crystalline graphite, ketjen black, graphene, a metal material, or a conductive polymer. The carbon nanotubes may include, but are not limited to, single-walled carbon nanotubes and/or multi-walled carbon nanotubes. The carbon fibers may include, but are not limited to, vapor Grown Carbon Fibers (VGCF) and/or nano carbon fibers. The above-mentioned metal material may include, but is not limited to, metal powder and/or metal fiber, and in particular, the metal may include, but is not limited to, at least one of copper, nickel, aluminum or silver. The conductive polymer may include, but is not limited to, at least one of a polyphenylene derivative, polyaniline, polythiophene, polyacetylene, or polypyrrole. The binder may include, but is not limited to, at least one of polyacrylic acid, sodium polyacrylate, potassium polyacrylate, lithium polyacrylate, polyimide, polyvinyl alcohol, carboxymethyl cellulose, sodium carboxymethyl cellulose, lithium carboxymethyl cellulose, polyimide, polyamideimide, styrene-butadiene rubber, or polyvinylidene fluoride. The mass ratio of the positive electrode active material, the conductive agent and the binder in the positive electrode material layer is not particularly limited, and can be selected by those skilled in the art according to actual needs as long as the purposes of the present application can be achieved.
The thicknesses of the positive electrode current collector and the positive electrode material layer are not particularly limited in the present application as long as the objects of the present application can be achieved. For example, the thickness of the positive electrode current collector is 5 μm to 20 μm, preferably 6 μm to 18 μm, and the thickness of the positive electrode material layer is 30 μm to 120 μm. The thickness of the positive electrode sheet is not particularly limited as long as the object of the present application can be achieved, for example, the thickness of the positive electrode sheet is 40 μm to 150 μm. Optionally, the positive electrode sheet may further comprise an undercoat layer between the positive electrode current collector and the positive electrode material layer. The composition of the primer layer is not particularly limited, and may be one commonly used in the art.
In the present application, the secondary battery further includes a negative electrode tab including a negative electrode current collector and a negative electrode material layer disposed on at least one surface of the negative electrode current collector. The above-mentioned "the negative electrode material layer is disposed on at least one surface of the negative electrode current collector" means that the negative electrode material layer may be disposed on one surface of the negative electrode current collector in the thickness direction thereof, or may be disposed on both surfaces of the negative electrode current collector in the thickness direction thereof. The "surface" here may be the entire area of the surface of the negative electrode current collector or may be a partial area of the surface of the negative electrode current collector, and the present application is not particularly limited as long as the object of the present application can be achieved.
The negative electrode current collector is not particularly limited as long as the object of the present application can be achieved, and may include, for example, copper foil, copper alloy foil, nickel foil, stainless steel foil, titanium foil, foam nickel, foam copper, or a composite current collector (for example, a carbon copper composite current collector, a nickel copper composite current collector, a titanium copper composite current collector, or the like).
In the present application, the anode material layer may further include other anode active materials, the kind of which is not particularly limited as long as the object of the present application can be achieved, for example, other anode active materials may include, but are not limited to, natural graphite, artificial graphite, intermediate phase micro carbon spheres (MCMB), hard carbon, soft carbon, li-Sn alloy, li-Sn-O alloy, sn, snO, snO 2 Spinel-structured lithium titanate Li 4 Ti 5 O 12 At least one of Li-Al alloy or metallic lithium.
The negative electrode material layer further includes a conductive agent and a binder, and the kind of the conductive agent and the binder is not particularly limited in the present application as long as the object of the present application can be achieved, and for example, at least one of the conductive agent and the binder may be used. The mass ratio of the negative electrode active material, the conductive agent and the binder in the negative electrode material layer is not particularly limited, and can be selected by a person skilled in the art according to actual needs, so long as the purpose of the present application can be achieved. The negative electrode material layer may further include a thickener, and the content and kind of the thickener are not particularly limited, and conventional kinds and contents known in the art may be employed as long as the object of the present application can be achieved.
The thickness of the anode material layer is not particularly limited as long as the object of the present application can be achieved, for example, the thickness of the anode material layer is 30 μm to 120 μm. The thickness of the negative electrode current collector is not particularly limited as long as the object of the present application can be achieved, for example, the thickness of the negative electrode current collector is 5 μm to 16 μm. The thickness of the negative electrode tab is not particularly limited as long as the object of the present application can be achieved, for example, the thickness of the negative electrode tab is 50 μm to 160 μm.
Optionally, the anode tab may further include an undercoat layer, which may be provided on one surface in the anode current collector thickness direction, or may be provided on both surfaces in the anode current collector thickness direction. Further, an undercoat layer may be provided between the anode current collector and the anode material layer. The "surface" here may be the entire region of the negative electrode current collector or may be a partial region of the negative electrode current collector, and the present application is not particularly limited as long as the object of the present application can be achieved. The composition of the primer layer is not particularly limited, and may be one commonly used in the art. For example, the primer layer includes a conductive agent and a binder. The conductive agent comprises at least one of carbon fiber, ketjen black, acetylene black, carbon nano tube or graphene; the binder comprises polyvinylidene fluoride, copolymer of vinylidene fluoride-hexafluoropropylene, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, sodium carboxymethyl cellulose, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene and at least one of polyhexafluoropropylene, styrene-butadiene rubber, acrylate or epoxy resin. The thickness of the undercoat layer is not particularly limited, and for example, the thickness of the undercoat layer is 0.1 μm to 5 μm.
In this application, the secondary battery also includes a separation film for separating the positive electrode sheet and the negative electrode sheet, preventing internal short circuit of the secondary battery, allowing free passage of electrolyte ions, and not affecting the progress of the electrochemical charge-discharge process. The separator is not particularly limited as long as the object of the present application can be achieved. For example, the material of the separator film may include, but is not limited to, at least one of Polyethylene (PE), polypropylene (PP) -based Polyolefin (PO), polyester (e.g., polyethylene terephthalate (PET) film), cellulose, polyimide (PI), polyamide (PA), spandex, or aramid; the type of separator film may include at least one of a woven film, a nonwoven film, a microporous film, a composite film, a laminate film, or a spun film.
For example, the release film may include a substrate layer and a surface treatment layer. The substrate layer may be a nonwoven fabric, a film or a composite film having a porous structure, and the material of the substrate layer may include at least one of polyethylene, polypropylene, polyethylene terephthalate or polyimide. Optionally, a polypropylene porous membrane, a polyethylene porous membrane, a polypropylene nonwoven fabric, a polyethylene nonwoven fabric, or a polypropylene-polyethylene-polypropylene porous composite membrane may be used. Optionally, a surface treatment layer is disposed on at least one surface of the substrate layer, and the surface treatment layer may be a polymer layer or an inorganic layer, or may be a layer formed by mixing a polymer and an inorganic material. For example, the inorganic layer includes inorganic particles and a binder, and the inorganic particles are not particularly limited and may include, for example, at least one of aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, hafnium oxide, tin oxide, cerium oxide, nickel oxide, zinc oxide, calcium oxide, zirconium oxide, yttrium oxide, silicon carbide, boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, or barium sulfate. The binder is not particularly limited, and may be at least one of the above binders, for example. The polymer layer contains a polymer, and the material of the polymer comprises at least one of polyamide, polyacrylonitrile, acrylic polymer, polyacrylic acid, polyacrylate, polyvinylpyrrolidone, polyvinyl ether, polyvinylidene fluoride or poly (vinylidene fluoride-hexafluoropropylene).
In the present application, the secondary battery may include, but is not limited to, a lithium ion secondary battery, a sodium ion secondary battery, or the like.
The process of preparing the secondary battery of the present application is well known to those skilled in the art, and the present application is not particularly limited, and may include, for example, but not limited to, the following steps: sequentially stacking the positive electrode plate, the isolating film and the negative electrode plate, winding and folding the positive electrode plate, the isolating film and the negative electrode plate according to the need to obtain an electrode assembly with a winding structure, placing the electrode assembly into a packaging bag, injecting electrolyte into the packaging bag, and sealing to obtain a secondary battery; or sequentially stacking the positive electrode plate, the isolating film and the negative electrode plate, fixing four corners of the whole lamination structure by using adhesive tapes to obtain an electrode assembly of the lamination structure, placing the electrode assembly into a packaging bag, injecting electrolyte into the packaging bag and sealing to obtain the secondary battery. In addition, an overcurrent prevention element, a guide plate, or the like may be placed in the package bag as needed, thereby preventing the pressure inside the secondary battery from rising and overcharging and discharging. The package is a package known in the art, and the present application is not limited thereto.
The present application includes an electrical device comprising a secondary battery in any of the foregoing embodiments. Thus, the power utilization device provided by the application has high energy density, good cycle life and high-temperature storage performance. The kind of the electric device is not particularly limited in the present application, and it may be any electric device known in the art. In some embodiments, the powered device may include, but is not limited to, a notebook computer, a pen-input computer, a mobile computer, an electronic book player, a portable telephone, a portable facsimile machine, a portable copier, a portable printer, a headset, a video recorder, a liquid crystal television, a portable cleaner, a portable CD player, a mini-compact disc, a transceiver, an electronic notepad, a calculator, a memory card, a portable audio recorder, a radio, a backup power source, a motor, an automobile, a motorcycle, a power assisted bicycle, a lighting fixture, a toy, a game machine, a clock, an electric tool, a flashlight, a camera, a household large-sized battery, a lithium ion capacitor, and the like.
Examples
Hereinafter, embodiments of the present application will be described in more detail with reference to examples and comparative examples. The various tests and evaluations were carried out according to the following methods. Unless otherwise specified, "parts" and "%" are mass references.
Test method and apparatus:
testing of cycle performance:
and placing the lithium ion battery in a constant temperature test box at 45 ℃, and standing for 30min to enable the lithium ion battery to reach a constant temperature state at 45 ℃. Charging with 0.5C constant currentConstant voltage charging to current of 0.025C at 4.5V, standing for 5min, discharging to 3.0V at constant current of 0.5C, and recording initial discharge capacity as C 0 Recording the thickness of the lithium ion battery in the discharge state at the moment as the initial thickness T 0 . With this step, 100 cycles were repeated, and the discharge capacity C after 100 cycles was recorded 1 And lithium ion battery thickness T in discharge state 1 。
Circulation capacity retention = C 1 /C 0 ×100%
Cycle thickness expansion ratio= (T 1 -T 0 ）/T 0 ×100%。
Testing of high temperature storage performance:
and placing the lithium ion battery in a constant temperature environment at 25 ℃, and standing for 30min to enable the lithium ion battery to reach a constant temperature state at 25 ℃. Constant current charging at 0.7C to 4.5V, constant voltage charging to current of 0.025C, recording thickness of lithium ion battery, and recording as initial thickness H 0 . Transferring the lithium ion battery into a 60 ℃ incubator for storage for 30 days, testing and recording the thickness of the lithium ion battery every 6 days, wherein the recorded test thickness after 30 days is the storage thickness H 1 。
High temperature storage thickness expansion ratio= (H) 1 -H 0 ）/H 0 ×100%。
And (3) testing the mass percentage of silicon:
and (3) sticking conductive adhesive on a sample table, spreading a powdery sample of the silicon-containing substances in each embodiment on the conductive adhesive, blowing away non-stuck powder by using an ear washing ball, spraying metal, and scanning and testing the mass percent of silicon element under the condition that the accelerating voltage is 10kV and the emission current is 10mA by using an X-ray energy spectrometer (EDS) equipped with a Philips XL-30 field emission scanning electron microscope.
Example 1-1
< preparation of siliceous substance >
SiO of silicon oxide material 2 Dispersing the powder material with lithium nitrate in ethanol, uniformly mixing, drying to obtain a powder material, and then carrying out heat treatment on the powder material in methane to obtain the silicon-containing substance with amorphous carbon on the surface. Wherein the temperature of the drying is 100 ℃; the temperature of the heat treatment is 450 ℃, and the heat treatmentThe temperature rising rate is 5 ℃/min, and the heat preservation time of the heat treatment is 3.2h; siO (SiO) 2 And lithium nitrate in a mass ratio of 36:1; the mass ratio of the powder material to the methane is 30:1. Wherein the mass percentage of silicon element in the silicon-containing substance is 65 percent.
< preparation of negative electrode sheet >
Mixing the silicon-containing substance, the CNT, the Super P and the lithium polyacrylate (PAA-Li) according to the mass ratio of 90:1.5:0.5:8, adding deionized water as a solvent, preparing into negative electrode slurry with the solid content of 54%, and stirring the negative electrode slurry into uniform negative electrode slurry under the action of a vacuum stirrer. Mixing the conductive agent Super P and the binder SBR according to the mass ratio of 9:1, and then adding deionized water as a solvent to prepare the base coat slurry with the solid content of 10%. And sequentially and uniformly coating the bottom coating slurry and the negative electrode slurry on one surface of a negative electrode current collector copper foil with the thickness of 8 mu m, and drying at the temperature of 85 ℃ to obtain a single-sided coated negative electrode plate with the bottom coating thickness of 2 mu m and the negative electrode material layer thickness of 100 mu m. And repeating the steps on the other surface of the negative electrode plate to obtain the double-sided coated negative electrode plate. After the coating is completed, the negative pole piece is cold-pressed and cut into the specification of 76mm multiplied by 851mm for standby.
< preparation of Positive electrode sheet >
Lithium cobalt oxide (LiCoO) as a positive electrode active material 2 ) Mixing conductive agent (Super P) and binder polyvinylidene fluoride (PVDF) according to the mass ratio of 97:1.4:1.6, adding N-methyl pyrrolidone (NMP) as a solvent, preparing into slurry with the solid content of 75%, and stirring the slurry into uniform positive electrode slurry under the action of a vacuum stirrer. And uniformly coating the positive electrode slurry on one surface of a positive electrode current collector aluminum foil with the thickness of 10 mu m, and drying at the temperature of 85 ℃ to obtain a positive electrode plate with a positive electrode material layer with the thickness of 110 mu m and single-sided coating of a positive electrode active material. And repeating the steps on the other surface of the positive electrode plate to obtain the positive electrode plate with the double-sided coating of the positive electrode active material. After the coating is completed, the positive pole piece is cold-pressed and cut into the specification of 74mm multiplied by 867mm for standby.
< preparation of electrolyte >
Mixing the basic solvents of dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) according to the mass ratio of 1:1 in an argon atmosphere glove box with the water content of less than 10ppm, then adding the compound represented by the formula (I-1) with the mass percentage of A into the basic solvent, and then adding the mass percentage of W V The lithium bis (fluorosulfonyl) imide is dissolved and uniformly mixed, and the electrolyte is obtained after uniform stirring. Wherein the mass percentage W of the lithium difluorosulfimide is based on the mass of the electrolyte V 15.4% by mass of a compound represented by the formula (I) A80% by mass of a base solvent W J 4.6%.
< separation Membrane >
Polyethylene (PE) porous film (supplied by Celgard corporation) having a thickness of 5 μm was used.
< preparation of lithium ion Battery >
And sequentially stacking the prepared positive pole piece, the isolating film and the negative pole piece, so that the isolating film is positioned between the positive pole piece and the negative pole piece to play a role in isolation, and then winding to obtain the electrode assembly. After welding the electrode lugs, placing the electrode assembly into an aluminum plastic film packaging shell, drying the aluminum plastic film packaging shell in a vacuum oven at 85 ℃ for 12 hours to remove water, injecting the prepared electrolyte, and performing vacuum packaging, standing, formation (0.02C constant current charging to 3.5V, 0.1C constant current charging to 3.9V), shaping, capacity testing and other procedures to obtain the lithium ion battery.
Examples 1-2 to 1-35
The procedure of example 1-1 was repeated except that the relevant production parameters were adjusted in accordance with Table 1 in < production of electrolyte solution > and < production of siliceous substance >.
Examples 2-1 to 2-12
The procedure of examples 1-21 was repeated except that the cyclic ester was further added to the electrolyte preparation and the relevant preparation parameters were adjusted as shown in Table 2.
Examples 3-1 to 3-6
The procedure of examples 2-8 was repeated except that a fluorinated solvent was further added to the solution for the preparation of an electrolyte and the relevant preparation parameters were adjusted as shown in Table 3.
Comparative examples 1 to 1
An electrolyte was prepared in the same manner as in example 1 except that in < preparation of electrolyte >, the electrolyte was prepared as follows.
< preparation of electrolyte >
Mixing the basic solvents of dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) according to the mass ratio of 1:1 in an argon atmosphere glove box with the water content of less than 10ppm, and adding the weight percentage W V The lithium bis (fluorosulfonyl) imide is dissolved and uniformly mixed, and the electrolyte is obtained after uniform stirring. Wherein the mass percentage W of the lithium difluorosulfimide is based on the mass of the electrolyte V 15.4% by mass of the base solvent W J 84.6%.
The relevant preparation parameters and performance tests for each example and comparative example are shown in tables 1 to 3.
TABLE 1
Note that: in table 1, "/" indicates no relevant preparation parameters.
As can be seen from examples 1-1 to 1-35 and comparative examples 1-1, the mass percentage of silicon element in the silicon-containing substance, the kind and content of the fluorosulfonamide compound in the examples are all within the scope of the present application, while the comparative examples do not satisfy the above characteristics at the same time. The lithium ion battery in the embodiment of the application has higher circulation capacity retention rate, lower circulation thickness expansion rate and high-temperature storage thickness expansion rate, so that the lithium ion battery prepared from the electrolyte and the silicon-containing substance has better circulation performance and high-temperature storage performance.
TABLE 2
Note that: in Table 2, "/" indicates no relevant preparation parameters.
As can be seen from examples 2-1 to 2-12, when the cyclic ester was further added and the kind and content of the cyclic ester were within the range of the present application, the resulting lithium ion battery had a higher cycle capacity retention rate and a lower high temperature storage thickness expansion rate, thereby indicating further improvement in cycle performance and high temperature storage performance of the lithium ion battery.
TABLE 3 Table 3
Note that: in Table 3, "/" indicates no relevant preparation parameters.
As can be seen from examples 3-1 to 3-6, when the fluorinated solvent was further added and the kind and content of the fluorinated solvent were within the range of the present application, the obtained lithium ion battery had a higher cycle capacity retention rate and a lower high-temperature storage thickness expansion rate, thereby indicating further improvement in cycle performance and high-temperature storage performance of the lithium ion battery.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modifications, equivalent substitutions, improvements, etc. that are within the spirit and principles of the present application are intended to be included within the scope of the present application.

Claims (7)

1. A secondary battery comprising a positive electrode sheet, a negative electrode sheet and an electrolyte, wherein the negative electrode sheet comprises a negative electrode material layer, the negative electrode material layer comprises a silicon-containing substance, silicon elements are included in particles of the silicon-containing substance, and the mass percentage B of the silicon elements is 5-85% based on the mass of the silicon-containing substance;
the electrolyte comprises one or more of fluoro sulfonamide compounds represented by the formula (I):
wherein R is 1 Selected from fluorine atoms, all or part of fluorine substituted C 1 To C 10 C substituted by alkyl, whole or part of fluorine 6 To C 10 Aryl, all or part of fluorine substituted C 1 To C 10 C substituted by oxyalkyl, total or partial fluorine 6 To C 10 An oxygen-containing aryl group of (a); the R is 1 Wherein the O atom is not directly connected with the S atom; r is R 2 And R is 3 Each independently selected from substituted or unsubstituted C 1 To C 5 Alkyl, substituted or unsubstituted C 6 To C 10 Aryl of said substituted C 1 To C 5 The substituents in the alkyl group of (2) are fluorine atoms, the substituted C 6 To C 10 Wherein the substituent in the aryl group is a fluorine atom;
the electrolyte further comprises a cyclic ester; the mass percentage C of the cyclic ester is 10-50% based on the mass of the electrolyte, the cyclic ester comprises at least one of ethylene carbonate, propylene carbonate, trimethylene carbonate, ethylene sulfate, propylene sulfate or 1, 3-propylene glycol cyclosulfate, and the mass percentage A of the fluoro-sulfonamide is 10-70%;
p1=a/B, P1 has a value of 0.1 to 2;
p2=a/C, and P2 has a value of 1 to 7.
2. The secondary battery according to claim 1, wherein the electrolyte further comprises a fluorinated solvent, the fluorinated solvent having a mass percentage E of 5% to 35% based on the mass of the electrolyte, the fluorinated solvent comprising at least one of fluoroethylene carbonate, bis-fluoroethylene carbonate, trifluoromethylethylene carbonate, trifluoroethanol acetate, or difluoroethanol acetate, and the fluorinated sulfonamide having a mass percentage a of 10% to 65%.
3. The secondary battery according to any one of claims 1 to 2, wherein the elemental silicon mass percentage B is 5% to 65% based on the mass of the silicon-containing substance.
4. The secondary battery according to any one of claims 1 to 2, wherein the silicon-containing substance comprises a silicon oxygen composite material or silicon carbonComposite material, the surface of the silicon-oxygen composite material or silicon-carbon composite material particle comprises LiF and AlF 3 、Li 2 CO 3 At least one of amorphous carbon or graphitized carbon.
5. The secondary battery according to claim 1, wherein the value of P1 is 0.5 to 2.
6. The secondary battery according to claim 1, wherein the a is 20% to 60%.
7. An electric device comprising the secondary battery according to any one of claims 1 to 6.
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