CN117913220A - 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
CN117913220A
CN117913220A CN202311872354.0A CN202311872354A CN117913220A CN 117913220 A CN117913220 A CN 117913220A CN 202311872354 A CN202311872354 A CN 202311872354A CN 117913220 A CN117913220 A CN 117913220A
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silicon
secondary battery
electrolyte
mass
negative electrode
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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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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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  • Condensed Matter Physics & Semiconductors (AREA)
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  • Battery Electrode And Active Subsutance (AREA)

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 can obviously improve the cycle performance and the high-temperature storage performance of the secondary battery.

Description

Secondary battery and electricity utilization device comprising same
The invention is a divisional application with the application number 202310326821.3, the application date 2023, the month 3 and the day 30, and the invention name of a secondary battery and an electric device comprising the secondary battery.
Technical Field
The present application relates to the field of electrochemical technology, and more particularly, to a secondary battery and an electric device including the same.
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 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 comprises one or more of fluoro sulfonamide compounds represented by the formula (I):
Wherein R 1 is selected from the group consisting of a fluorine atom, an alkyl group of C 1 to C 10 substituted with all or part fluorine, an aryl group of C 6 to C 10 substituted with all or part fluorine, an oxyalkyl group of C 1 to C 10 substituted with all or part fluorine, an oxyaryl group of C 6 to C 10 substituted with all or part fluorine; the O atom in R 1 is not directly connected with the S atom; r 2 and R 3 are each independently selected from substituted or unsubstituted C 1 to C 5 alkyl, substituted or unsubstituted C 6 to C 10 aryl, the substituents in the substituted C 1 to C 5 alkyl being fluorine atoms, the substituents in the substituted C 6 to C 10 aryl being fluorine atoms;
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 can obviously improve the cycle performance and the high-temperature storage performance of the secondary battery.
In some embodiments of the 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 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 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 at least one of LiF, alF 3、Li2CO3, 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 application, p1=a/B, and P1 has a value of 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 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 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 the secondary battery of any of the foregoing embodiments. Therefore, the power utilization device provided by the application has high energy density, good cycle life and high-temperature storage performance.
The application has the beneficial effects 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 can obviously improve the cycle performance and the high-temperature storage performance of the secondary battery.
Of course, it is not necessary for any one product or method of practicing the application to achieve all of the advantages set forth above at the same time.
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, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the 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 1 is selected from the group consisting of a fluorine atom, an alkyl group of C 1 to C 10 substituted with all or part fluorine, an aryl group of C 6 to C 10 substituted with all or part fluorine, an oxyalkyl group of C 1 to C 10 substituted with all or part fluorine, an oxyaryl group of C 6 to C 10 substituted with all or part fluorine; the O atom in R 1 is not directly attached to the S atom; r 2 and R 3 are each independently selected from substituted or unsubstituted C 1 to C 5 alkyl, substituted or unsubstituted C 6 to C 10 aryl, the substituents in the substituted C 1 to C 5 alkyl being fluorine atoms, the substituents in the substituted C 6 to C 10 aryl being fluorine atoms;
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 obviously 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 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 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 silicon element, which can contribute reversible capacity by intercalation and deintercalation of lithium. The silicon-containing substance is not particularly limited, and may be, for example, at least one of silicon nanoparticles, silicon nanowires, micro-silicon, silicon oxygen composite material (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), and the silicon-containing substance may be one having at least one of LiF, alF 3、Li2CO3, amorphous carbon, or graphitized carbon present on the surface. In some embodiments of the 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 at least one of LiF, alF 3、Li2CO3, 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 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 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 in the present application, 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 silicon element in the silicon-containing substance can be regulated and controlled by regulating and controlling the mass ratio of the silicon material to the lithium nitrate.
In the application, the secondary battery further comprises a positive electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode material layer arranged 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 of the present application is not particularly limited as long as the object of the present application can be achieved, and may include, for example, aluminum foil, aluminum alloy foil, or a composite current collector (e.g., 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 in the present application 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, at least one of nickel cobalt lithium manganate (e.g., common NCM811, NCM622, NCM523, NCM 111), nickel cobalt lithium aluminate, lithium iron phosphate, lithium-rich manganese-based material, lithium cobalt oxide (LiCoO 2), lithium manganate, lithium iron 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 present application is not particularly limited in kind 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 a person skilled in the art according to actual needs as long as the purpose 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 as long as the object 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 of the present application is not particularly limited as long as the object of the present application can be achieved, and 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, carbon copper composite current collector, nickel copper composite current collector, titanium copper composite current collector, or the like) may be included.
In the present application, the anode material layer may further include other anode active materials, the present application is not particularly limited in kind as long as the object of the present application can be achieved, and for example, the other anode active materials may include, but are not limited to, at least one of 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 4Ti5O12, li-Al alloy, or metallic lithium.
The negative electrode material layer further includes a conductive agent and a binder, and the present application is not particularly limited in kind as long as the object of the present application can be achieved, and for example, may be at least one of the above-mentioned conductive agent and the above-mentioned binder. The mass ratio of the anode active material, the conductive agent and the binder in the anode material layer is not particularly limited, and can be selected by a person skilled in the art according to actual needs as long as the purpose of the 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 in the present application, 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 the application, the secondary battery also comprises a separation film for separating the positive electrode plate and the negative electrode plate, preventing the internal short circuit of the secondary battery, allowing electrolyte ions to pass freely, and not affecting the electrochemical charge and 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. Wherein the package is a package known in the art, and the application is not limited thereto.
The present application includes an electrical device comprising the secondary battery of any of the foregoing embodiments. Therefore, 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 to 4.5V with constant current of 0.5C, charging to current of 0.025C at constant voltage, standing for 5min, discharging to 3.0V with constant current of 0.5C, recording initial discharge capacity as C 0, and recording thickness of lithium ion battery in discharge state as initial thickness T 0. With this step, 100 cycles were repeated, and the discharge capacity C 1 after the 100 cycles and the lithium ion battery thickness T 1 in the discharge state were recorded.
Circulation capacity retention = C 1/C0 x 100%
The cycle thickness expansion rate= (T 1-T0)/T0 ×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 ℃. The thickness of the lithium ion battery was recorded as the initial thickness H 0 by constant current charging at 0.7C to 4.5V and then constant voltage charging to a current of 0.025C. The lithium ion battery was transferred to a 60 ℃ incubator for 30 days, during which the thickness of the lithium ion battery was tested and recorded every 6 days, and after 30 days the test thickness recorded was the storage thickness H 1.
High temperature storage thickness expansion rate= (H 1-H0)/H0 ×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 the mass percent of silicon element under the conditions of acceleration voltage of 10kV and emission current of 10mA by using an X-ray energy spectrometer (EDS) equipped with a PhilipsXL-30 field emission scanning electron microscope.
Example 1-1
< Preparation of siliceous substance >
Dispersing a silicon oxide material SiO 2 and 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 a 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 ℃, the heating rate of the heat treatment is 5 ℃/min, and the heat preservation time of the heat treatment is 3.2h; the mass ratio of SiO 2 to lithium nitrate is 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 >
The positive electrode active material lithium cobaltate (LiCoO 2), a conductive agent (Super P) and a binder polyvinylidene fluoride (PVDF) are mixed according to the mass ratio of 97:1.4:1.6, N-methyl pyrrolidone (NMP) is added as a solvent to prepare slurry with the solid content of 75%, and the slurry is stirred to form uniform positive electrode slurry by 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 >
In an argon atmosphere glove box with the water content less than 10ppm, mixing basic solvents of dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) according to the mass ratio of 1:1, then adding a compound represented by a formula (I-1) with the mass percentage of A into the basic solvent, adding lithium bis (fluorosulfonyl) imide with the mass percentage of W V, dissolving and uniformly mixing, and stirring uniformly to obtain electrolyte. Wherein, based on the mass of the electrolyte, the mass percentage W V of lithium difluorosulfimide is 15.4%, the mass percentage A of the compound represented by the formula (I) is 80%, and the mass percentage W J of the base solvent is 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 >
In an argon atmosphere glove box with the water content less than 10ppm, mixing the basic solvents of dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) according to the mass ratio of 1:1, adding the lithium bis (fluorosulfonyl) imide with the mass percentage of W V, dissolving and uniformly mixing, and stirring uniformly to obtain the electrolyte. Wherein, based on the mass of the electrolyte, the mass percentage W V of the lithium difluorosulfimide is 15.4 percent, and the mass percentage W J of the base solvent is 84.6 percent.
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 examples 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-mentioned characteristics at the same time. The lithium ion battery provided by the embodiment of the application has higher cycle capacity retention rate, lower cycle thickness expansion rate and lower high-temperature storage thickness expansion rate, so that the lithium ion battery prepared from the electrolyte and the silicon-containing substance provided by the application has better cycle 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 cyclic esters were further added and the kinds and contents of the cyclic esters were within the scope 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 a fluorinated solvent was further added and the kind and content of the fluorinated solvent were within the scope 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.
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 modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (11)

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 1 is selected from the group consisting of a fluorine atom, an alkyl group of C 1 to C 10 substituted with all or part fluorine, an aryl group of C 6 to C 10 substituted with all or part fluorine, an oxyalkyl group of C 1 to C 10 substituted with all or part fluorine, an oxyaryl group of C 6 to C 10 substituted with all or part fluorine; the O atom in R 1 is not directly connected with the S atom; r 2 and R 3 are each independently selected from substituted or unsubstituted C 1 to C 5 alkyl, substituted or unsubstituted C 6 to C 10 aryl, the substituents in the substituted C 1 to C 5 alkyl being fluorine atoms, the substituents in the substituted C 6 to C 10 aryl being fluorine atoms;
the mass percentage A of the fluoro-sulfonamide is 10 to 80 percent based on the mass of the electrolyte;
The electrolyte further comprises a fluorinated solvent, wherein the mass percentage E of the fluorinated solvent is 5-35% based on the mass of the electrolyte, and the fluorinated solvent comprises at least one of fluoroethylene carbonate, bifluoroethylene carbonate, trifluoromethyl ethylene carbonate, trifluoroethanol acetate or difluoroethanol acetate.
2. The secondary battery according to claim 1, wherein 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.
3. The secondary battery according to claim 1, wherein the mass percentage a of the fluorosulfonamide is 10% to 65%.
4. The secondary battery according to any one of claims 1 to 3, wherein the silicon element mass percentage B is 5% to 65% based on the mass of the silicon-containing substance.
5. The secondary battery according to any one of claims 1 to 3, wherein the silicon-containing substance comprises a silicon-oxygen composite material or a silicon-carbon composite material, and the surface of the silicon-oxygen composite material or the silicon-carbon composite material particles comprises at least one of LiF, alF 3、Li2CO3, amorphous carbon, or graphitized carbon.
6. The secondary battery according to any one of claims 1 to 3, wherein p1=a/B, and P1 has a value of 0.1 to 2.
7. The secondary battery according to claim 6, wherein the value of P1 is 0.5 to 2.
8. The secondary battery according to any one of claims 1 to 3, wherein the fluorosulfonamide compound represented by the formula (I) is selected from at least one of the following formulas (I-1) to (I-32):
9. The secondary battery according to claim 2, wherein p2=a/C, and P2 has a value of 1 to 7.
10. The secondary battery according to any one of claims 1 to 3, wherein the a is 20% to 60%.
11. An electric device comprising the secondary battery according to any one of claims 1 to 10.
CN202311872354.0A 2023-03-30 2023-03-30 Secondary battery and electricity utilization device comprising same Pending CN117913220A (en)

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