Non-aqueous electrolyte, secondary batteries and power consumption devices

Abstract

This application provides a non-aqueous electrolyte, a secondary battery, and a power consumption device. The non-aqueous electrolyte includes an additive, which includes a first additive and a second additive, wherein the first additive is one or more cyclic sulfate ester compounds having the structure shown in general formula (I), and the second additive is one or more cyclic carbonate ester compounds having the structure shown in general formula (III) or general formula (IV). JPEG2026518245000061.jpg74170

Description

[Technical Field]

[0001] This application relates to the field of battery technology, and more particularly to non-aqueous electrolytes, secondary batteries, and power consumption devices. [Background technology]

[0002] In recent years, with advancements in lithium-ion secondary battery technology, lithium-ion batteries have been widely applied in various fields, including energy storage and power systems such as hydroelectric, thermal, wind, and solar power plants, as well as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, and aerospace. Due to the rapid development of lithium-ion secondary batteries, higher requirements have been raised regarding their rapid charging performance, cycle characteristics, and safety.

[0003] Among battery performance requirements, high power output and long lifespan are particularly important for lithium secondary batteries used in automobiles. Simultaneously, reducing resistance and improving battery lifespan are also crucial challenges. It is known that increased battery resistance and lifespan degradation include the continuous reduction of the electrolyte at the negative electrode during the charging process. To overcome this problem, attempts have been made to add multiple compounds to the electrolyte to form a passivation layer on the negative electrode surface; this passivation layer is also called an SEI film. The SEI film is a good lithium-ion conductor and a poor electron conductor, suppressing the continued progression of lithium consumption reactions and protecting the electrode. Research has shown that a high-quality solid electrolyte interface (SEI) film that is uniform, dense, stable, has low impedance, and possesses good adhesion is advantageous for improving the electrical and chemical properties of batteries. However, if the SEI film produced by electrolyte additives contains abundant organic components such as alkyllithium, the electrode impedance increases, degrading the cell's output performance. Furthermore, the increased impedance can lead to lithium deposition on the negative electrode, potentially further degrading the cell's lifespan. [Overview of the project] [Problems that the invention aims to solve]

[0004] This application provides a non-aqueous electrolyte, a secondary battery, and a power consumption device that optimize the cycle characteristics and storage characteristics of a cell. [Means for solving the problem]

[0005] According to a first aspect of the present application, a non-aqueous electrolyte containing an additive is provided, the additive comprising a first additive and a second additive, the first additive being one or more cyclic sulfate ester compounds having a structure represented by general formula (I), [ka] R 1 , R 2 , R 3 and R 4 Each of the following is independently selected from a group having the structure shown in general formula (II), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and n1 and n2 are independently any integer between 0 and 2. General formula (II) is [ka] And, R 5 and R 6 Each of these is independently selected from one of the following: a group having the structure shown in general formula (II), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and n3 is any integer from 0 to 2. The second additive is one or more cyclic carbonate ester compounds having a structure represented by general formula (III) or general formula (IV). [ka] In general formula (III), R 7 and R 8 are each independently selected from any one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, *R 13 -O-R 14 , *=CR 15 R 16 , and R 13 is a C1-C6 alkylene group, a C1-C6 haloalkylene group, a C2-C6 alkenylene group, or a C2-C6 alkynylene group, and R 14 , R 15 , and R 16 are each independently any one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, or a C2-C6 alkynyl group, where * indicates the bonding site, [Chemical formula] In general formula (IV), R 9 , R 10 , R 11 , R 12 are each independently selected from any one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, *R 13 -O-R 14 , *=CR 15 R 16 , and R 13 is a C1-C6 alkylene group, a C1-C6 haloalkylene group, a C2-C6 alkenylene group, or a C2-C6 alkynylene group, and R 14 , R 15 , and R 16 are each independently any one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, or a C2-C6 alkynyl group, where * indicates the bonding site, and R 9 , R 10 , R 11 , R12 It is not a hydrogen atom at the same time.

[0006] The cyclic sulfate ester additive in the non-aqueous electrolyte generates a more stable SEI film on the negative electrode side during the initial charging process of the secondary battery, with stronger electron-blocking capability. This SEI film more effectively blocks electrons, mitigating continuous decomposition of the electrolyte at the negative electrode, thereby significantly improving the cell's lifespan. Saturated and unsaturated cyclic carbonate esters in the non-aqueous electrolyte generate a more elastic SEI film on the negative electrode side. This SEI can effectively resist damage caused by the expansion and contraction of the negative electrode sheet, further improving the cycle characteristics. The non-aqueous electrolyte of this application improves the overall performance of the SEI film by using cyclic sulfate esters and cyclic carbonate esters simultaneously, optimizing the cell's cycle characteristics and storage characteristics.

[0007] In any embodiment of the first aspect, the above R 1 and R 2 It is not a hydrogen atom at the same time, and R 3 and R 4 It is not a hydrogen atom at the same time. Naturally, R 1 , R 2 , R 3 , R 4 It may also be a hydrogen atom.

[0008] In any embodiment of the first aspect, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 The following conditions must be met.

[0009] R 1 and R 2 It is simultaneously a hydrogen atom, and R 3 and R 4One of the atoms is a hydrogen atom and the other is one of the following: a group having the structure shown in general formula (II), a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and R in the group having the structure shown in general formula (II) 5 and R 6 It is not a hydrogen atom at the same time.

[0010] In any embodiment of the first aspect, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 The following conditions must be met.

[0011] R 3 and R 4 It is simultaneously a hydrogen atom, and R 1 and R 2 One of the atoms is a hydrogen atom and the other is one of the following: a group having the structure shown in general formula (II), a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and R in the group having the structure shown in general formula (II) 5 and R 6 It is not a hydrogen atom at the same time.

[0012] The above R 1 , R 2 , R 3 and R 4The base of the compound has substituents, and by introducing substituents such as alkyl groups, it is possible to create an elastic SEI film with longer organic chains on the negative electrode, thereby preventing the SEI film from breaking down in response to volume changes that occur on the negative electrode during the cycling process. By introducing substituents including F and N, it is possible to create an SEI film that participates in film formation on the negative electrode and is rich in more inorganic components such as LiF and Li3N, thereby improving the mechanical strength of the SEI film, improving the stability of the negative electrode SEI film, and further improving the cycle characteristics of the battery.

[0013] In any embodiment of the first aspect, the cyclic sulfate ester compound has the structure shown in general formula (I-1), [ka] R 1 , R 2 , R 3 and R 4 Each of these is independently selected from one of the following: a group having the structure shown in general formula (II-1), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group. The general formula (II-1) is [ka] And, R 5 and R 6 Each of these is independently selected from one of the following: a group having the structure shown in general formula (II-1), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group. In the above general formula (I-1), the rings of the cyclic sulfate esters are all 5-membered rings, which allows for the formation of a denser SEI film.

[0014] In any embodiment of the first aspect, the above R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are each independently selected from any one of a group having a structure represented by the general formula (II-1), a hydrogen atom, a halogen atom, a C1-C3 alkyl group, a C1-C3 haloalkyl group, a C1-C3 alkoxy group, a C1-C3 haloalkoxy group, a C2-C3 alkenyl group, a C1-C3 ester group, a cyano group, and a sulfonic acid group.

[0015] In any embodiment of the first aspect, the above R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are each independently selected from any one of a group having a structure represented by the general formula (II-1), a hydrogen atom, a halogen atom, and a C1-C3 haloalkyl group.

[0016] In any embodiment of the first aspect, the above R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are each independently selected from any one of a group having a structure represented by the general formula (II-1), a hydrogen atom, an F atom, a Cl atom, a Br atom, a methyl group, an ethyl group, a propyl group, and an isopropyl group.

[0017] In any embodiment of the first aspect, the group having the structure represented by the general formula (II-1) is selected from any one of the following groups:

Chemical formula

[0018] In any embodiment of the first aspect, the above R1 , R 2 , R 3 and R 4 are each independently [Chem.] selected from any one of a hydrogen atom, F atom, Cl atom, Br atom, methyl group, ethyl group, propyl group and isopropyl group, and X is a F atom.

[0019] In any embodiment of the first aspect, the above R 1 , R 2 , R 3 and R 4 are each independently [Chem.] selected from any one of a hydrogen atom, methyl group and ethyl group, and X is a F atom.

[0020] In any embodiment of the first aspect, the above cyclic sulfate compound is selected from any one or more of the following compounds. [Chem.]

[0021] The manufacturing method of the above cyclic sulfate compound is simpler, industrially popular and easy to implement, and the effect of improving the life of the secondary battery is more stable.

[0022] In any embodiment of the first aspect, the above R 7 , R 8 are each independently selected from any one of a hydrogen atom, halogen atom, C1-C4 alkyl group, C1-C4 haloalkyl group, C1-C4 alkoxy group, C2-C4 alkenyl group, and C2-C4 alkynyl group.

[0023] In any embodiment of the first aspect, the above R 7 , R 8Each of these is independently selected from one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, or a C2-C4 alkenyl group.

[0024] In any embodiment of the first aspect, the above R 7 , R 8 Each of these groups is independently selected from one of the following: hydrogen atom, halogen atom, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, halomethyl group, haloethyl group, halopropyl group, vinyl group, or allyl group.

[0025] In any embodiment of the first aspect, the above R 7 , R 8 Each of these is independently selected from one of the following: a hydrogen atom, a halogen atom, a methyl group, an ethyl group, an n-propyl group, an isobutyl group, a halomethyl group, a haloethyl group, or a vinyl group.

[0026] In any embodiment of the first aspect, the halogen atom is a F atom, a Cl atom, and more selectively a F atom.

[0027] In any embodiment of the first aspect, the cyclic carbonate ester compound having the above general formula (III) is selected from one or more of the following compounds. [ka]

[0028] The test results, [ka] or [ka] It was found that this allows for the formation of a denser and more elastic SEI coating during use, and more effectively mitigates the damage to the SEI coating caused by the expansion and contraction of the negative electrode sheet.

[0029] In any embodiment of the first aspect, the above R 9 , R 10 , R 11 , R 12 Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, a C1-C4 alkoxy group, a C2-C4 alkenyl group, a C2-C4 alkynyl group, and *R 13 -OR 14 *=CR 15 R 16 One of the following is selected, R 13 These are C1-C4 alkylene groups, C1-C4 haloalkylene groups, C2-C4 alkenylene groups, and C2-C4 alkynylene groups, and R 14 , R 15 , R 16 Each of these is independently one of the following: a hydrogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, a C2-C4 alkenyl group, or a C2-C4 alkynyl group.

[0030] In any embodiment of the first aspect, the above R 9 , R 10 , R 11 , R 12 Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, a C2-C4 alkenyl group, a C2-C4 alkynyl group, and *R 13 -OR 14 *=CR 15 R 16 One of the following is selected, R 13 R consists of a C1-C4 alkylene group, a C2-C4 alkenylene group, and a C2-C4 alkynylene group. 14 , R 15 , R 16 Each of these is independently one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C2-C4 alkenyl group, or a C2-C4 alkynyl group.

[0031] In any embodiment of the first aspect, the above R 9 , R10 , R 11 , R 12 Each of these is independently a hydrogen atom, halogen atom, methyl group, ethyl group, n-propyl group, isopropyl group, halomethyl group, haloethyl group, halopropyl group, vinyl group, allyl group, ethynyl group, propynyl group, *methylene-OR 14 *Ethylene-OR 14 *=CR 15 R 16 One of the following is selected, R 14 R is one of the following: hydrogen atom, methyl group, ethyl group, vinyl group, or ethynyl group. 15 , R 16 Each of these is independently a hydrogen atom or a fluorine atom.

[0032] In any embodiment of the first aspect, the halogen atom is a F atom, a Cl atom, and more selectively a F atom.

[0033] In any embodiment of the first aspect, the cyclic carbonate ester compound having the above general formula (IV) is selected from one or more of the following compounds. [ka]

[0034] The test results, [ka] or [ka] It was discovered that this forms an SEI coating rich in LiF, which not only blocks electrons but also mitigates the destruction of the SEI coating due to the expansion and contraction of the negative electrode sheet.

[0035] In any embodiment of the first aspect, the mass ratio of the first additive in the non-aqueous electrolyte is W1, and W1 is selectively between 0.001% and 20%, and more selectively between 0.1% and 5%. By utilizing cyclic sulfate ester compounds, a sufficiently stable SEI film having an organic-inorganic hybrid with a stronger electron-blocking ability can be formed, thereby not only effectively improving the cycle characteristics of the secondary battery but also improving the output power of the secondary battery.

[0036] In any embodiment of the first aspect, the mass ratio of the second additive in the non-aqueous electrolyte is W2, and W2 is selectively between 0.001% and 20%, and more selectively between 0.1% and 5%. A cyclic carbonate ester is used to form an SEI film of a more appropriate thickness, thereby achieving both elasticity and avoiding adverse effects on conductivity.

[0037] In any embodiment of the first aspect, 0.01 ≤ W1 / W2 ≤ 10, preferably 0.05 ≤ W1 / W2 ≤ 5, and by controlling the ratio of the two substances, the ratio of different types of SEI coatings formed by them is optimized, thereby optimizing the improvement effect that the overall SEI performance has on the cell's cycle characteristics and storage characteristics.

[0038] In any embodiment of the first aspect, the non-aqueous electrolyte further comprises an electrolyte containing an alkali metal salt, wherein the electrolyte selectively contains a lithium salt or a sodium salt, wherein the lithium salt selectively comprises one or more selected from the group consisting of lithium hexafluorophosphate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide and lithium bistrifluoromethanesulfonylimide, and the sodium salt comprises one or more selected from the group consisting of sodium hexafluorophosphate, sodium difluorooxalatoborate, sodium perchlorate, sodium bis(fluorosulfonyl)imide, sodium bis(trifluoromethanesulfonyl)imide and sodium trifluoromethanesulfonate. Each of the above lithium salts or sodium salts may be used alone or in mixtures of two or more.

[0039] In any embodiment of the first aspect, the non-aqueous electrolyte further comprises a non-aqueous solvent, which is selectively selected from the group consisting of cyclic carbonates, linear carbonates, nitrile solvents, ketone solvents and sulfone solvents, and further selectively comprises one or more non-aqueous solvents selected from the group consisting of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, ethyl methyl sulfone, diethyl sulfone, tetrahydrofuran, ethylene glycol dimethyl ether, dioxolane, acetone, acetonitrile and butyronitrile.

[0040] In any embodiment of the first aspect, the additive further includes, but is not limited to, one or more selected from the group consisting of sulfate ester compounds, sulfite ester compounds, sultone compounds, disulfonic acid compounds, nitrile compounds, aromatic compounds, isocyanate compounds, phosphazene compounds, cyclic acid anhydride compounds, phosphite ester compounds, phosphate ester compounds, borate ester compounds, and carboxylic acid ester compounds.

[0041] A second aspect of the present application provides a secondary battery comprising a positive electrode sheet, an electrolyte, a separator, and a negative electrode sheet, wherein the electrolyte comprises any one of the non-aqueous electrolytes of the first aspect, and the secondary battery is selectively a lithium-ion secondary battery or a sodium-ion secondary battery. The secondary battery has good cycle characteristics and storage characteristics.

[0042] In any embodiment of the second aspect, the negative electrode sheet includes a negative electrode current collector and a negative electrode film layer installed on one or both sides of the negative electrode current collector, wherein the porosity of the negative electrode film layer is selectively 30% to 45%, and selectively 37% to 42%. This improves the wetting properties of the negative electrode material in the electrolyte, thereby giving the cell a high energy density.

[0043] In any embodiment of the second aspect, the negative electrode film layer comprises a negative electrode active material, and selectively, the negative electrode active material has a D V 50 ≥ 6 μm, and further selectively, the D of the negative electrode active material. V The value of 50 is between 15 μm and 20 μm. This reduces side reactions on the negative electrode surface and improves the cell's cycle and storage characteristics.

[0044] A third aspect of the present application provides a power consumption device including a secondary battery, the secondary battery including any one of the secondary batteries of the second aspect of the present application. The secondary battery has good cycle characteristics and storage characteristics, thereby the power supply system of the power consumption device has a long lifespan.

[0045] To more clearly explain the technical solutions in the embodiments of this application, the necessary drawings for the embodiments are briefly described below. It should be understood that the drawings shown below represent only a few embodiments of this application, and those skilled in the art can obtain further drawings based on these drawings without requiring any creative effort. [Brief explanation of the drawing]

[0046] [Figure 1] This is a schematic diagram of a secondary battery according to one embodiment of the present invention. [Figure 2] Figure 1 is an exploded view of a secondary battery according to one embodiment of the present invention. [Figure 3] This is a schematic diagram of a battery module according to one embodiment of the present invention. [Figure 4] This is a schematic diagram of a battery pack according to one embodiment of the present invention. [Figure 5] Figure 4 is an exploded view of a battery pack according to one embodiment of the present invention. [Figure 6] This is a schematic diagram of a power consumption device that uses a secondary battery as a power source according to one embodiment of the present invention. [Modes for carrying out the invention]

[0047] In drawings, the drawings are not drawn according to actual proportions.

[0048] Embodiments of the present application will be described in more detail below with reference to the drawings and examples. The detailed description of the following embodiments and drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, and the present application is not limited to the embodiments described.

[0049] The embodiments of the non-aqueous electrolyte, secondary battery, and power consumption device of this application will be described in detail below, with reference to the drawings as appropriate. However, unnecessary details may be omitted. For example, detailed explanations of well-known matters and redundant explanations of structures that are actually the same may be omitted. This is to avoid making the following explanation unnecessarily long and to make it easily understandable to those skilled in the art. The drawings and the following explanation are provided to enable those skilled in the art to fully understand this application and are not intended to limit the topics described in the claims.

[0050] The “range” disclosed herein is limited in the form of a lower and upper limit, and a given range is limited by selecting one lower limit and one upper limit, the selected lower and upper limits defining the boundaries of a particular range. Ranges defined in this manner may or may not include the values ​​at both ends and can be combined in any way, that is, any lower limit can be combined with any upper limit to form a range. For example, if the ranges 60-120 and 80-110 are listed for a particular parameter, it is understood that the ranges 60-110 and 80-120 are also expected. Similarly, if the minimum range values ​​1 and 2 are listed, and the maximum range values ​​3, 4 and 5 are listed, the ranges 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5 are all intended. In this application, unless otherwise specified, the numerical range “a-b” means an abbreviated expression for any combination of real numbers between a and b, where both a and b are real numbers. For example, the numerical range "0 to 5" means that all real numbers between "0 to 5" are listed in this specification, and "0 to 5" is merely an abbreviated expression for combinations of these numbers. Also, when a parameter is described as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0051] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical inventions.

[0052] Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical concepts.

[0053] Unless otherwise specified, all steps of the present invention may be performed sequentially or randomly, preferably sequentially. For example, the fact that the method includes steps (a) and (b) means that the method may include steps (a) and (b) performed sequentially, or steps (b) and (a) performed sequentially. For example, the fact that the method referred to above may further include step (c) means that step (c) may be added to the method in any order, for example the method may include steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), and so on.

[0054] Unless otherwise specified, the terms “includes” and “inclusive” as used herein may be open-ended or closed-ended. For example, “includes” and “inclusive” may further include or include other components not listed, or they may include or include only the components listed.

[0055] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, the condition "A or B" is satisfied by either A being true (or existing) and B being false (or not existing), A being false (or not existing) and B being true (or existing), or both A and B being true (or existing).

[0056] [Secondary battery] Secondary batteries, also known as rechargeable batteries or storage batteries, are batteries that can be used continuously by reactivating the active material through a charging method after the battery has been discharged.

[0057] Generally, a secondary battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte. During the charging and discharging process of the battery, active ions (e.g., lithium ions) reciprocate between the positive and negative electrode sheets, being inserted and removed. The separator is placed between the positive and negative electrode sheets and primarily serves to prevent short circuits between the positive and negative electrodes while also allowing active ions to pass through. The electrolyte primarily serves to conduct active ions between the positive and negative electrode sheets.

[0058] [Nonaqueous electrolyte] One embodiment of the present application provides a non-aqueous electrolyte containing an additive, the additive comprising a first additive and a second additive, the first additive comprising one or more cyclic sulfate ester compounds having the structure shown in general formula (I), [ka] R 1 , R 2 , R 3 and R 4 Each of the following is independently selected from a group having the structure shown in general formula (II), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and n1 and n2 are independently any integer between 0 and 2. General formula (II) is [ka] And, R 5 and R 6 Each of these is independently selected from one of the following: a group having the structure shown in general formula (II), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and n3 is any integer from 0 to 2. The second additive comprises one or more cyclic carbonate ester compounds having a structure represented by general formula (III) or general formula (IV). [ka] In general formula (III), R 7 , R 8 Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and *R 13 -OR 14 *=CR 15 R 16 One of the following is selected, R 13 R consists of a C1-C6 alkylene group, a C1-C6 haloalkylene group, a C2-C6 alkenylene group, and a C2-C6 alkynylene group. 14 , R 15 , R 16 Each is independently one of the following: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, or a C2-C6 alkynyl group, and * indicates a bonding site. [ka] In general formula (IV), R 9 , R 10 , R 11 , R 12 Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and *R 13 -OR 14 *=CR 15 R 16 One of the following is selected, R 13 R consists of a C1-C6 alkylene group, a C1-C6 haloalkylene group, a C2-C6 alkenylene group, and a C2-C6 alkynylene group. 14 , R 15 , R 16Each of these is independently one of the following: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, or a C2-C6 alkynyl group, and * indicates a bonding site, and R 9 , R 10 , R 11 , R 12 It is not a hydrogen atom at the same time.

[0059] The cyclic sulfate ester additive in the non-aqueous electrolyte generates a more stable SEI film on the negative electrode side during the initial charging process of the secondary battery, with stronger electron-blocking capability. This SEI film more effectively blocks electrons, mitigating continuous decomposition of the electrolyte at the negative electrode, thereby significantly improving the cell's lifespan. Saturated and unsaturated cyclic carbonate esters in the non-aqueous electrolyte generate a more elastic SEI film on the negative electrode side. This SEI can effectively resist damage caused by the expansion and contraction of the negative electrode sheet, further improving the cycle characteristics. The non-aqueous electrolyte of this application improves the overall performance of the SEI film by using cyclic sulfate esters and cyclic carbonate esters simultaneously, optimizing the cell's cycle characteristics and storage characteristics.

[0060] In some embodiments, the above R 1 and R 2 It is not a hydrogen atom at the same time, and R 3 and R 4 It is not a hydrogen atom at the same time. Naturally, R 1 , R 2 , R 3 , R 4 It may also be a hydrogen atom.

[0061] In some embodiments, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 The following conditions must be met.

[0062] R 1 and R 2 It is simultaneously a hydrogen atom, and R3 and R 4 One of the atoms is a hydrogen atom and the other is one of the following: a group having the structure shown in general formula (II), a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and R in the group having the structure shown in general formula (II) 5 and R 6 It is not a hydrogen atom at the same time.

[0063] In some embodiments, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 The following conditions must be met.

[0064] R 3 and R 4 It is simultaneously a hydrogen atom, and R 1 and R 2 One of the atoms is a hydrogen atom and the other is one of the following: a group having the structure shown in general formula (II), a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and R in the group having the structure shown in general formula (II) 5 and R 6 It is not a hydrogen atom at the same time.

[0065] The above R 1 , R 2 , R 3 and R 4The base of the compound has substituents, and by introducing substituents such as alkyl groups, it is possible to create an elastic SEI film with longer organic chains on the negative electrode, thereby preventing the SEI film from breaking down in response to volume changes that occur on the negative electrode during the cycling process. By introducing substituents including F and N, it is possible to create an SEI film that participates in film formation on the negative electrode and is rich in more inorganic components such as LiF and Li3N, thereby improving the mechanical strength of the SEI film, improving the stability of the negative electrode SEI film, and further improving the cycle characteristics of the battery.

[0066] The alkyl group mentioned above may be a linear alkyl group, a branched alkyl group, or a cycloalkyl group, and includes but is not limited to methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, isobutyl group, cyclopropyl group, cyclobutyl group, etc. The alkyl group in the haloalkyl group mentioned above may be a linear alkyl group, a branched alkyl group, or a cycloalkyl group, for example, methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, isobutyl group, cyclopropyl group, cyclobutyl group, etc., but is not limited to these. The halogen atom may be a fluorine atom, a chlorine atom, or a bromine atom, and the halogen atom is optional in the alkyl group. One or more hydrogen atoms are substituted, the alkoxy group includes but is not limited to cyclopropyl group, oxetanyl group, etc., the halogen atom in the haloalkoxy group may be a fluorine atom, a chlorine atom, or a bromine atom, the halogen atom substitutes any one or more hydrogen atoms in the alkoxy group, the alkenyl group includes but is not limited to -CH=CH2, -CH=CH2CH3, -CH2CH=CH2, -CH2CH=CH2CH3, and the ester group includes but is not limited to methyl formate group, ethyl formate group, ethyl acetate group, methyl propionate group, ethyl propionate group, propyl propionate group, etc.

[0067] In some embodiments, the cyclic sulfate ester compound has the structure shown in general formula (I-1), [ka] R 1 , R2 , R 3 and R 4 Each of these is independently selected from one of the following: a group having the structure shown in general formula (II-1), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group. The general formula (II-1) is [ka] And, R 5 and R 6 Each of these is independently selected from one of the following: a group having the structure shown in general formula (II-1), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group.

[0068] In the above general formula (I-1), the rings of the cyclic sulfate esters are all 5-membered rings, which allows for the formation of a denser SEI film. Compared to 6-membered rings, they have greater ring strain and are easier to deposit at the negative electrode. 6-membered rings have less ring strain, are more stable, and deposit at the negative electrode is slower, resulting in lower efficiency in generating an electron-blocking SEI film and affecting the effectiveness of the SEI film.

[0069] In some embodiments, the above R 1 , R 2 , R 3 , R 4 , R 5 and R 6 Each of these is independently selected from one of the following: a group having the structure shown in general formula (II-1), a hydrogen atom, a halogen atom, a C1-C3 alkyl group, a C1-C3 haloalkyl group, a C1-C3 alkoxy group, a C1-C3 haloalkoxy group, a C2-C3 alkenyl group, a C1-C3 ester group, a cyano group, and a sulfonic acid group.

[0070] In some embodiments, the above R 1 , R 2 , R 3 , R 4 , R 5 and R 6 Each of these is independently selected from one of the following: a group having the structure shown in general formula (II-1), a hydrogen atom, a halogen atom, a C1-C3 alkyl group, or a C1-C3 haloalkyl group.

[0071] In some embodiments, the above R 1 , R 2 , R 3 , R 4 , R 5 and R 6 Each of these is independently selected from one of the following: a group having the structure shown in general formula (II-1), a hydrogen atom, a F atom, a Cl atom, a Br atom, a methyl group, an ethyl group, a propyl group, and an isopropyl group.

[0072] In some embodiments, the base of the structure represented by the general formula (II-1) above is selected from one of the following bases: [ka] And X is an F atom, a Cl atom, or a Br atom.

[0073] In some embodiments, the above R 1 , R 2 , R 3 and R 4 Each is independent of the others. [ka] X is selected from one of the following: hydrogen atom, fluorine atom, chlorine atom, brin atom, methyl group, ethyl group, propyl group, and isopropyl group, and X is a fluorine atom.

[0074] In some embodiments, the above R 1 , R 2 , R3 and R 4 Each is independent of the others. [ka] X is selected from one of the following: a hydrogen atom, a methyl group, or an ethyl group, and X is a fluorine atom.

[0075] In some embodiments, the above cyclic sulfate ester compound is selected from one or more of the following compounds. [ka]

[0076] The above method for producing the cyclic sulfate ester compound is simpler, easier to implement and industrially, and provides a more stable effect in improving the lifespan of secondary batteries.

[0077] In some embodiments, the above R 7 , R 8 Each of these is independently selected from one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, a C1-C4 alkoxy group, a C2-C4 alkenyl group, or a C2-C4 alkynyl group.

[0078] In some embodiments, the above R 7 , R 8 Each of these is independently selected from one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, or a C2-C4 alkenyl group.

[0079] In some embodiments, the above R 7 , R 8 Each of these groups is independently selected from one of the following: hydrogen atom, halogen atom, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, halomethyl group, haloethyl group, halopropyl group, vinyl group, or allyl group.

[0080] In some embodiments, the above R 7 , R 8 Each of these is independently selected from one of the following: a hydrogen atom, a halogen atom, a methyl group, an ethyl group, an n-propyl group, an isobutyl group, a halomethyl group, a haloethyl group, or a vinyl group.

[0081] In some embodiments, the halogen atom is a fluorine atom, a chlorine atom, and more selectively a fluorine atom.

[0082] In some embodiments, the cyclic carbonate ester compound having the above general formula (III) is selected from one or more of the following compounds. [ka]

[0083] The test results, [ka] or [ka] It was found that this allows for the formation of a denser and more elastic SEI coating during use, and more effectively mitigates the damage to the SEI coating caused by the expansion and contraction of the negative electrode sheet.

[0084] In some embodiments, the above R 9 , R 10 , R 11 , R 12 Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, a C1-C4 alkoxy group, a C2-C4 alkenyl group, a C2-C4 alkynyl group, and *R 13 -OR 14 *=CR 15 R 16 One of the following is selected, R 13These are C1-C4 alkylene groups, C1-C4 haloalkylene groups, C2-C4 alkenylene groups, and C2-C4 alkynylene groups, and R 14 , R 15 , R 16 Each of these is independently one of the following: a hydrogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, a C2-C4 alkenyl group, or a C2-C4 alkynyl group.

[0085] In some embodiments, the above R 9 , R 10 , R 11 , R 12 Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, a C2-C4 alkenyl group, a C2-C4 alkynyl group, and *R 13 -OR 14 *=CR 15 R 16 One of the following is selected, R 13 R consists of a C1-C4 alkylene group, a C2-C4 alkenylene group, and a C2-C4 alkynylene group. 14 , R 15 , R 16 Each of these is independently one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C2-C4 alkenyl group, or a C2-C4 alkynyl group.

[0086] In some embodiments, the above R 9 , R 10 , R 11 , R 12 Each of these is independently a hydrogen atom, halogen atom, methyl group, ethyl group, n-propyl group, isopropyl group, halomethyl group, haloethyl group, halopropyl group, vinyl group, allyl group, ethynyl group, propynyl group, *methylene-OR 14 *Ethylene-OR 14 *=CR 15 R 16 One of the following is selected, R 14 R is one of the following: hydrogen atom, methyl group, ethyl group, vinyl group, or ethynyl group. 15 , R16 Each of these is independently a hydrogen atom or a fluorine atom.

[0087] In some embodiments, the halogen atom is a fluorine atom, a chlorine atom, and more selectively a fluorine atom.

[0088] In some embodiments, the cyclic carbonate ester compound having the above general formula (IV) is selected from one or more of the following compounds. [ka]

[0089] The test results, [ka] or [ka] It was discovered that this forms an SEI coating rich in LiF, which not only blocks electrons but also mitigates the destruction of the SEI coating due to the expansion and contraction of the negative electrode sheet.

[0090] The amount of cyclic sulfate ester compound used in each of the above embodiments of this application can refer to the amount of cyclic sulfate ester compound used in a normal non-aqueous electrolyte, and in some embodiments, the mass ratio of the first additive in the non-aqueous electrolyte is W1, and W1 is selectively between 0.001% and 20%, for example, 0.001%, 0.005%, 0.01%, 0.05%, 0.1%, 0.5%, 1%, 3%, 5%, 10%, 15%, or 20%, and further selectively between 0.1% and 5%. By utilizing cyclic sulfate ester compounds, it is possible to effectively improve the cycle characteristics of secondary batteries as well as the output power of secondary batteries by sufficiently forming an organic-inorganic hybrid SEI film that is more stable and has a stronger electron-blocking ability. The above limitations on mass content prevent the cyclic sulfate ester compound from being too low in content, which would prevent the SEI coating from functioning properly. Furthermore, it prevents the cyclic sulfate ester compound from being too high, which would increase the viscosity of the electrolyte and thicken the SEI coating formed on the negative electrode, thus degrading the conductivity of the electrolyte and reducing the improvement effect on cycle characteristics and charging capacity.

[0091] The amount of cyclic carbonate compound used in each of the above embodiments of this application can refer to the amount of cyclic carbonate compound used in a typical non-aqueous electrolyte, and in some embodiments, the mass ratio of the second additive in the non-aqueous electrolyte is W2, and W2 is selectively between 0.001% and 20%, for example, 0.001%, 0.005%, 0.01%, 0.05%, 0.1%, 0.5%, 1%, 3%, 5%, 10%, 15%, or 20%, and more selectively between 0.1% and 5%. By using cyclic carbonate, a more appropriate thickness SEI film is formed, thereby achieving both an effect on elasticity and conductivity.

[0092] In some embodiments, 0.01 ≤ W1 / W2 ≤ 10, preferably 0.05 ≤ W1 / W2 ≤ 5, and by controlling the ratio of the two substances, the ratio of different types of SEI coatings formed by them is optimized, thereby optimizing the improvement effect that the overall SEI performance has on the cell's cycle characteristics and storage characteristics.

[0093] In some embodiments, the non-aqueous electrolyte further comprises an electrolyte, and any electrolyte commonly used in non-aqueous electrolytes can be considered for use in the non-aqueous electrolyte of this application. Those skilled in the art can select the non-aqueous electrolyte depending on the battery system in which it is used, for example, by selecting a common electrolyte used in lithium-ion secondary batteries or sodium-ion secondary batteries. In some embodiments, the electrolyte comprises an alkali metal salt-based electrolyte, and selectively the electrolyte comprises a lithium salt or a sodium salt, wherein the lithium salt comprises one or more selected from the group consisting of lithium hexafluorophosphate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide and lithium bistrifluoromethanesulfonylimide, and the sodium salt comprises one or more selected from the group consisting of sodium hexafluorophosphate, sodium difluorooxalatoborate, sodium perchlorate, sodium bis(fluorosulfonyl)imide, sodium bis(trifluoromethanesulfonyl)imide and sodium trifluoromethanesulfonate. Each of the above lithium salts or sodium salts may be used alone or in combination of two or more.

[0094] The electrolyte content in the non-aqueous electrolyte can refer to the electrolyte content in a typical non-aqueous electrolyte, and in some embodiments, the electrolyte content in the non-aqueous electrolyte is 0.1 mol / L to 5 mol / L, and may be, for example, 0.1 mol / L, 0.3 mol / L, 0.5 mol / L, 1 mol / L, 1.5 mol / L, 2 mol / L, 2.5 mol / L, 3 mol / L, 4 mol / L, or 5 mol / L, selectively 0.5 mol / L to 1.5 mol / L, and even more selectively 0.7 mol / L to 1.2 mol / L.

[0095] In some embodiments, the non-aqueous electrolyte further comprises a non-aqueous solvent, which is selectively one or more selected from the group consisting of cyclic carbonates, linear carbonates, nitrile solvents, ketone solvents and sulfone solvents, and further selectively the non-aqueous solvent comprises one or more selected from the group consisting of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, ethyl methyl sulfone, diethyl sulfone, tetrahydrofuran, ethylene glycol dimethyl ether, dioxolane, acetone, acetonitrile and butyronitrile. The above non-aqueous solvents may be used alone or as a mixture of two or more. For example, if it is desired to improve the load characteristics and low-temperature characteristics of a secondary battery, a mixed solvent of cyclic carbonate ester and linear carbonate ester can be used. When the non-aqueous electrolyte of this invention is applied to a solid-state battery, a solid solvent such as dimethyl sulfone can be used.

[0096] In addition to the above-mentioned additives, the additives may further include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve specific performance of the battery, such as additives that improve the overcharge characteristics of the battery, or additives that improve the high-temperature or low-temperature characteristics of the battery. In some embodiments, the above-mentioned additives may further include, but are not limited to, one or more selected from the group consisting of sulfate ester compounds, sulfite ester compounds, sultone compounds, disulfonic acid compounds, nitrile compounds, aromatic compounds, isocyanate compounds, phosphazene compounds, cyclic acid anhydride compounds, phosphite ester compounds, phosphate ester compounds, borate ester compounds, and carboxylic acid ester compounds.

[0097] [Method for producing cyclic sulfate ester compounds having the structure shown in general formula (I)] A method for producing a cyclic sulfate ester compound having the structure shown in general formula (I) of this application refers to the following synthesis route. [ka]

[0098] The reaction temperature in the first step is controlled to 30-60°C. The reaction temperature in the second step is controlled to 10-30°C, and the second step uses a catalyst, such as ruthenium trichloride trihydrate, to perform catalytic action. The oxidizing agent may be sodium hypochlorite, ozone, etc.

[0099] [Positive electrode sheet] The positive electrode sheet generally includes a positive electrode current collector and a positive electrode film layer placed on at least one surface of the positive electrode current collector, the positive electrode film layer containing a positive electrode active material.

[0100] For example, the positive electrode current collector has two opposing surfaces in its own thickness direction, and the positive electrode film layer is provided on one or both of the two opposing surfaces of the positive electrode current collector.

[0101] In some embodiments, the positive electrode current collector may be a metal foil sheet or a composite current collector. For example, aluminum foil may be used as the metal foil sheet. The composite current collector may include a polymer material base layer and a metal layer formed on at least one surface of the polymer material base layer. The composite current collector may be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer material substrate (for example, a substrate such as polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), or polyethylene (PE)).

[0102] In some embodiments, the positive electrode active material may be a positive electrode active material known in the art for batteries. For example, the positive electrode active material may include at least one of olivine-structured lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may be used. These positive electrode active materials may be used individually or in combination of two or more. Here, examples of lithium transition metal oxides include lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (e.g., LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2(NCM 333 (It may also be abbreviated as LiNi) 0.5 Co 0.2 Mn 0.3 O2(NCM 523 (It may also be abbreviated as LiNi) 0.5 Co 0.25 Mn 0.25 O2(NCM 211 (It may also be abbreviated as LiNi) 0.6 Co 0.2 Mn 0.2 O2(NCM 622 (It may also be abbreviated as LiNi) 0.8 Co 0.1 Mn 0.1 O2(NCM 811 (May be abbreviated as LiNi) Lithium nickel cobalt aluminum oxide (e.g., LiNi 0.85 Co 0.15 Al 0.05It may contain, but is not limited to, at least one of O2) and its modified compounds. Examples of lithium-containing phosphates with an olivine structure include, but is not limited to, at least one of lithium iron phosphate (e.g., LiFePO4 (also called LFP)), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO4), composite materials of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and composite materials of lithium iron manganese phosphate and carbon.

[0103] In some embodiments, the positive electrode film layer may selectively further contain a binder. As an example, the binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, and fluorine-containing acrylate resins.

[0104] In some embodiments, the positive electrode film layer may further selectively contain a conductive agent. As an example, the conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0105] In some embodiments, a positive electrode sheet can be manufactured by the following method: Components for manufacturing the positive electrode sheet, such as a positive electrode active material, a conductive agent, a binder, and any other components, are dispersed in a solvent (e.g., N-methylpyrrolidone) to form a positive electrode paste, the positive electrode paste is applied to a positive electrode current collector, and the positive electrode sheet can be obtained through processes such as drying and cold pressing.

[0106] [Negative electrode sheet] The negative electrode sheet includes a negative electrode active material and a negative electrode current collector and a negative electrode film layer installed on at least one surface of the negative electrode current collector.

[0107] For example, the negative electrode current collector has two opposing surfaces in its own thickness direction, and the negative electrode film layer is provided on one or both of the two opposing surfaces of the negative electrode current collector.

[0108] In some embodiments, the negative electrode current collector may be a metal foil sheet or a composite current collector. For example, copper foil may be used as the metal foil sheet. The composite current collector may include a polymer material base layer and a metal layer formed on at least one surface of the polymer material substrate. The composite current collector may be formed by forming a metal material (such as copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys) on a polymer material substrate (for example, a substrate such as polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), or polyethylene (PE)).

[0109] In some embodiments, the negative electrode active material may be any negative electrode active material known in the art for batteries. For example, the negative electrode active material may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. Silicon-based materials can be selected from at least one of elemental silicon, silicon oxide, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials can be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other conventional materials usable as negative electrode active materials for batteries may be used. These negative electrode active materials may be used individually or in combination of two or more types.

[0110] In some embodiments, the porosity of the negative electrode film layer is 30% to 45%, and selectively 37% to 42%. If the porosity of the negative electrode film layer on the negative electrode sheet is less than 30%, the gaps between particles within the negative electrode film layer are small, the particle structure is compressed and broken, the difficulty of electrolyte infiltration increases, the polarization of the cell increases, and the long-term cycle characteristics of the cell deteriorate. If the porosity of the negative electrode film layer on the negative electrode sheet exceeds 45%, the rebound of the polar sheet is large, the compression of the polar sheet in actual use decreases, and the energy density of the cell is affected.

[0111] The porosity of the negative electrode active material coating layer on the negative electrode sheet is measured using an AccuPyc II 1340 true density meter, according to the instrument's instructions. The porosity of the negative electrode active material coating layer on the polar sheet can be controlled by adjusting the particle size of the negative electrode active material and the pressure during the cold pressing process.

[0112] In some embodiments, the negative electrode active material layer comprises a negative electrode active material, and selectively, the negative electrode active material is D V 50 ≥ 6 μm, and further selectively, the D of the negative electrode active material. V 50 is between 15 μm and 20 μm. The first and second additives form an SEI film of a certain thickness on the surface of the negative electrode sheet, thereby increasing the volume-based particle size distribution of the negative electrode material, which reduces the contact area between the negative electrode active material and the electrolyte, reduces side reactions on the negative electrode surface, and improves the cell's cycle characteristics and storage characteristics.

[0113] In this application, the volume-based particle size distribution Dv50 of the negative electrode active material has a meaning known in the art and can be measured using instruments and methods known in the art. For example, it can be measured using a laser particle size analyzer (e.g., Master Size 3000) by referring to the GB / T 19077-2016 particle size distribution laser diffraction method.

[0114] In some embodiments, the negative electrode film layer may selectively further contain a binder. For example, the binder can be selected from at least one of styrene-butadiene rubber (SBR), polyacrylic acid (PAA), sodium polyacrylate (PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), polymethacrylic acid (PMAA), and carboxymethyl chitosan (CMCS).

[0115] In some embodiments, the negative electrode film layer may further selectively contain a conductive agent. As an example, the conductive agent can be selected from at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0116] In some embodiments, the negative electrode film layer further comprises other additives, such as a selective thickener (e.g., sodium carboxymethylcellulose (CMC-Na)).

[0117] In some embodiments, a negative electrode sheet can be manufactured by the following method: Components for manufacturing the negative electrode sheet, such as a negative electrode active material, a conductive agent, a binder, and any other components, are dispersed in a solvent (e.g., deionized water) to form a negative electrode paste, the negative electrode paste is coated onto a negative electrode current collector, and the negative electrode sheet can be obtained through steps such as drying and cold pressing.

[0118] [Separator] In some embodiments, the secondary battery further includes a separator. The present application is not particularly limited to the type of separator, and any known porous separator having good chemical and mechanical stability may be selected.

[0119] In some embodiments, the material of the separator may be selected from at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multilayer composite film, and is not particularly limited. When the separator is a multilayer composite film, the materials of each layer may be the same or different, and is not particularly limited.

[0120] In some embodiments, the positive electrode sheet, negative electrode sheet, and separator can be manufactured into an electrode assembly by a winding process or a lamination process.

[0121] In some embodiments, the secondary battery may include an outer casing. This casing may be used to package the electrode assembly and electrolyte.

[0122] In some embodiments, the casing of the secondary battery may be a rigid housing, such as a rigid plastic housing, an aluminum housing, or a steel housing. The casing of the secondary battery may also be a pouch, such as a bag-shaped pouch. The material of the pouch may be plastic, and examples of plastics include polypropylene, polybutylene terephthalate, and polybutylene succinate.

[0123] This application does not particularly limit the shape of the secondary battery, which may be cylindrical, rectangular, or any other shape. For example, Figure 1 shows a secondary battery 5 with a rectangular structure as an example.

[0124] In some embodiments, referring to FIG. 2, the exterior body may include a housing 51 and a cover plate 53. Here, the housing 51 may include a bottom plate and side plates connected to the bottom plate, and the bottom plate and the side plates enclose to form a receiving cavity. The housing 51 has an opening communicating with the receiving cavity, and the cover plate 53 can cover the opening to seal the receiving cavity. The positive electrode sheet, the negative electrode sheet and the separator can form an electrode assembly 52 by a winding process or a lamination process. The electrode assembly 52 is packaged in the receiving cavity. The electrolyte is infiltrated into the electrode assembly 52. The number of electrode assemblies 52 included in the secondary battery 5 may be one or more, and those skilled in the art can specifically select according to actual needs.

[0125] In some embodiments, the secondary battery may be assembled into a battery module, and the number of secondary batteries included in the battery module may be one or more. The specific number can be selected by those skilled in the art according to the application and capacity of the battery module.

[0126] FIG. 3 shows a battery module 4 as an example. Referring to FIG. 3, in the battery module 4, a plurality of secondary batteries 5 may be arranged in sequence along the longitudinal direction of the battery module 4. Of course, they may be arranged in any other way. Further, these plurality of secondary batteries 5 may be fixed by fasteners.

[0127] Optionally, the battery module 4 may further include a housing having a receiving space, and a plurality of secondary batteries 5 are received in this receiving space.

[0128] In some embodiments, the above battery module may be further assembled into a battery pack, and the number of battery modules included in the battery pack may be one or more. The specific number can be selected by those skilled in the art according to the application and capacity of the battery pack.

[0129] Figures 4 and 5 show an example of a battery pack 1. Referring to Figures 4 and 5, the battery pack 1 may include a battery box and a plurality of battery modules 4 installed in the battery box. The battery box includes an upper housing 2 and a lower housing 3, the upper housing 2 being covered by the lower housing 3 and forming a sealed space for housing the battery modules 4. The plurality of battery modules 4 may be arranged in the battery box in any manner.

[0130] The present invention further provides a power consumption device comprising at least one of a secondary battery, battery module, or battery pack according to the present invention. The secondary battery, battery module, or battery pack may be used as a power source for the power consumption device or as an energy storage unit for the power consumption device. The power consumption device may include, but is not limited to, mobile devices (e.g., mobile phones, laptop computers, etc.), electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0131] The aforementioned power consumption device can be selected from a secondary battery, battery module, or battery pack depending on the usage demand.

[0132] Figure 6 shows an example of a power consumption device. This power consumption device is a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle. To meet the high power and high energy density requirements for the secondary battery of the power consumption device, a battery pack or battery module can be used. [Examples]

[0133] [Examples] Examples of the present application are described below. The examples described below are illustrative and are for interpretive purposes only, and should not be considered as limitations thereon. Where no specific techniques or conditions are shown in the examples, they should be carried out in accordance with the techniques or conditions described in the literature in the art, or in accordance with the product instructions. Where the manufacturer of the reagents or equipment used is not specified, they are all common commercially available products, and information on other reagents or compounds is given in Table 1.

[0134] [Table 1]

[0135] Synthesis example 1: Compound 1 [ka] synthesis Step 1: Add 300 g (2 mol) of 1,6-dideoxyhexitol solid to a 2 L three-necked flask and start stirring. Add 523 g (4.4 mol) of thionyl chloride dropwise to the three-necked flask, controlling the temperature to approximately 15°C during the dropwise addition process. After the addition is complete, keep the reaction at 45°C for 4 hours until a large amount of paste-like solid precipitates in the reaction solution. After cooling, slowly add 1 L of deionized water dropwise, quickly stir the reaction system to disperse the solid, filter it, wash the resulting solid by beating it multiple times with deionized water until the pH becomes neutral, and dry the filtered cake under reduced pressure at 60°C to obtain the intermediate product.

[0136] Step 2: Add 184.2 g (0.8 mol) of intermediate product 1 to a 3 L three-necked flask, add 1000 mL of acetonitrile, add 80 mg of ruthenium trichloride trihydrate catalyst, purge the system with nitrogen gas, cool the system to 20°C, start stirring, and within 1 hour add 2000 g of 20% sodium hypochlorite aqueous solution dropwise to control the reaction temperature to 10-20°C. After the dropwise addition is complete, stir for 10 minutes at 10-20°C, separate the liquids, and quench the organic phase with sodium sulfite aqueous solution until the potassium iodide starch test paper no longer turns blue. Separate the liquids again, concentrate the organic layer, and crystallize it with acetonitrile to obtain a white powder solid, which is compound 1. 1H-NMR, CD3CN, δ ppm 5.42-5.39 (m, 2H), 5.36-5.34 (m, 2H), 1.67-1.65 (d, 6H).

[0137] Synthesis example 2: Compound 2 [ka] synthesis Step 1: Add 356.5 g (2 mol) of 3,4,5,6-octanetetraol solid to a 2 L three-necked flask and start stirring. Add 523 g (4.4 mol) of thionyl chloride dropwise to the three-necked flask, controlling the temperature to approximately 15°C during the addition process. After the addition is complete, keep the reaction at 45°C for 4 hours until a large amount of paste-like solid precipitates in the reaction solution. After cooling, slowly add 1 L of deionized water dropwise, quickly stir the reaction system to disperse the solid, filter it, wash the resulting solid by beating it multiple times with deionized water until the pH becomes neutral, and dry the filtered cake under reduced pressure at 60°C to obtain the intermediate product.

[0138] Step 2: Add 216.2 g (0.8 mol) of intermediate product 1 to a 3 L three-necked flask, add 1000 mL of acetonitrile, add 80 mg of ruthenium trichloride trihydrate catalyst, purge the system with nitrogen gas, cool the system to 20°C, start stirring, and within 1 hour add 2000 g of 20% sodium hypochlorite aqueous solution dropwise to control the reaction temperature to 10-20°C. After the dropwise addition is complete, stir for 10 minutes at 10-20°C, separate the liquids, and quench the organic phase with sodium sulfite aqueous solution until the potassium iodide starch test paper no longer turns blue. Separate the liquids again, concentrate the organic layer, and crystallize it with acetonitrile to obtain compound 2.

[0139] Synthesis example 3: Compound 3 [ka] synthesis Step 1: Add 328.4 g (2 mol) of 2,3,4,5-heptanetetraol solid to a 2 L three-necked flask and start stirring. Add 523 g (4.4 mol) of thionyl chloride dropwise to the three-necked flask, controlling the temperature to approximately 15°C during the dropwise addition process. After the addition is complete, keep the reaction at 45°C for 4 hours until a large amount of paste-like solid precipitates in the reaction solution. After cooling, slowly add 1 L of deionized water dropwise, quickly stir the reaction system to disperse the solid, filter it, wash the resulting solid by beating it multiple times with deionized water until the pH becomes neutral, and dry the filtered cake under reduced pressure at 60°C to obtain the intermediate product.

[0140] Step 2: Add 205 g (0.8 mol) of intermediate product 1 to a 3 L three-necked flask, add 1000 mL of acetonitrile, and stir until the solid is completely dissolved. Add 80 mg of ruthenium trichloride trihydrate catalyst, purge the system with nitrogen gas, and then cool the system to 20°C. Start stirring and within 1 hour add 2000 g of 20% sodium hypochlorite aqueous solution dropwise to control the reaction temperature to 10-20°C. After the dropwise addition is complete, stir for 10 minutes at 10-20°C, separate the liquids, and quench the organic phase with sodium sulfite aqueous solution until the potassium iodide starch test paper no longer turns blue. Separate the liquids again, concentrate the organic layer, and crystallize it with acetonitrile to obtain compound 3 (163.1 g, yield 82.8%).

[0141] Synthesis Example 4: Compound 4

Chem.

[0142] Step 2: Add 140 g (0.4 mol) of Intermediate Product 1 to a 4 - L three - necked flask, add 1000 mL of acetonitrile, add 110 mg of ruthenium trichloride trihydrate catalyst. After purging the system with nitrogen gas, cool the system to 20 °C, start stirring, and dropwise add 1500 g of 20% sodium hypochlorite aqueous solution within 1 h, controlling the reaction temperature at 10 - 20 °C. After the dropping is complete, stir at 10 - 20 °C for 10 min, separate the layers, and quench the organic phase with sodium sulfite aqueous solution until the potassium iodide starch test paper no longer turns blue. Separate the layers again, concentrate the organic layer, and crystallize with acetonitrile to obtain Compound 4.

[0143] Synthesis Example 5: Compound 5

Chem.

[0144] Step 2: Add 183.2 g (0.4 mol) of the intermediate product to a 4 L three-necked flask, add 1000 mL of acetonitrile, add 150 mg of ruthenium trichloride trihydrate catalyst, purge the system with nitrogen gas, cool the system to 20°C, start stirring, and within 1 hour add 2000 g of 20% sodium hypochlorite aqueous solution dropwise to control the reaction temperature to 10-20°C. After the dropwise addition is complete, stir for 10 minutes at 10-20°C, separate the liquids, and quench the organic phase with sodium sulfite aqueous solution until the potassium iodide starch test paper no longer turns blue. Separate the liquids again, concentrate the organic layer, and crystallize it with acetonitrile to obtain compound 5.

[0145] Furthermore, the synthesis method of the compound was as described in Synthesis Example 1, and the corresponding substrate from Table 2 was used instead of 1,6-dideoxyhexitol.

[0146] [Table 2-1] [Table 2-2]

[0147] Furthermore, the second additive used in the examples is shown in Table 3.

[0148] [Table 3]

[0149] Example 1 Manufacturing of rechargeable batteries: Electrolyte composition: Compound 1 was used as the first additive, with a mass content of 2% in the electrolyte, and Compound 14 was used as the second additive, with a mass content of 2% in the electrolyte. Lithium hexafluorophosphate (LiPF6) was used as the electrolyte, with a volume ratio of 3:7, and an EC+EMC (ethylene carbonate + ethyl methyl carbonate) mixture was used as the solvent.

[0150] Manufacturing of positive electrode sheets: The positive electrode active material lithium iron phosphate (LiFePO4), the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are dissolved in the solvent N-methylpyrrolidone (NMP) in a weight ratio of 90:5:5. The mixture is then thoroughly stirred and uniformly mixed to obtain a positive electrode paste. Subsequently, the positive electrode paste is uniformly applied to the positive electrode current collector, and then dried, cold-pressed, and cut to obtain a positive electrode sheet.

[0151] Manufacturing of negative electrode sheets: The negative electrode paste is prepared by dissolving graphite (the negative electrode active material), carbon black (the conductive agent), styrene-butadiene rubber (SBR) (the binder), and sodium carboxymethylcellulose (CMC-Na) (the thickener) in deionized water (the solvent) in a weight ratio of 90:4:4:2 and mixing them uniformly. The negative electrode paste is uniformly applied to the copper foil of the negative electrode current collector one or more times, and then dried, cold-pressed, and cut to obtain a negative electrode sheet. The porosity of the negative electrode film layer is 40%, and the graphite used is D V 50 is 18 μm.

[0152] Separator: A common polypropylene film is used as the separator.

[0153] Lithium-ion battery assembly: A positive electrode sheet, a separator, and a negative electrode sheet are stacked in order, with the separator acting as a barrier between the positive and negative electrode sheets. The assembly is then wound up to obtain the electrode assembly. The electrode assembly is placed in a battery housing, dried, and then the electrolyte is injected. A lithium-ion battery is then manufactured through processes such as chemical conversion and settling.

[0154] The substance or amount of the first additive and the substance or amount of the second additive in the electrolyte in Examples 1 to 42 and Comparative Examples 1 to 2 are all listed in Table 4, and everything else is the same as in Example 1.

[0155] [Table 4-1] [Table 4-2]

[0156] The porosity of the negative electrode film layer and the Dv50 of the negative electrode material used in Examples 43 to 52 are all recorded in Table 5, and all other details are the same as in Example 1.

[0157] [Table 5]

[0158] Performance testing: 1. Cycle characteristics test A lithium-ion battery is charged at 25°C with a constant current of 0.5C to 3.65V, then charged at 3.65V with a constant voltage of less than 0.05C, and then discharged at 0.5C with a constant current to 2.5V. This constitutes one charge-discharge cycle. The number of cycles required after the lithium-ion battery has degraded to 80% capacity is calculated by repeating this charging and discharging process.

[0159] 2. Storage characteristics test At 25°C, each manufactured lithium-ion secondary battery is first charged to 3.65V with a constant current of 0.33C, then charged again to a constant voltage of 3.65V with a current of 0.05C, and then discharged to 2.5V with a constant current of 0.33C. The discharge capacity C0 at this time is the discharge capacity of the lithium-ion secondary battery before high-temperature storage. Next, the lithium-ion secondary battery is charged to 3.65V with a constant current of 0.33C, and then charged again to a constant voltage of 3.65V with a current of 0.05C to fully charge the lithium-ion battery. The battery is placed in a 60°C oven for 30 days, then removed and discharged at 0.33C in a 25°C environment, with the discharge capacity being C1. Capacity retention rate = (C1 / C0) × 100%.

[0160] 3. Volume expansion coefficient test At 25°C, each lithium-ion secondary battery is first charged to 3.65V with a constant current of 0.33C, then charged again to a constant voltage of 3.65V with a current of 0.05C, and then discharged to 2.5V with a constant current of 0.33C. The discharge capacity at this point is the discharge capacity of the lithium-ion secondary battery before high-temperature storage. Next, the lithium-ion secondary battery is charged to 3.65V with a constant current of 0.33C, and then charged again to a constant voltage of 3.65V with a current of 0.05C to fully charge the lithium-ion battery. The volume of the battery is measured using the drainage method. After that, the lithium-ion batteries are stored at 60°C for 60 days, and after storage, the volume of the lithium-ion secondary batteries is measured in a 25°C environment using the drainage method. Battery volume expansion rate = (Volume after storage / Volume before storage - 1)%.

[0161] The test results are recorded in Table 6.

[0162] [Table 6-1] [Table 6-2]

[0163] As can be seen from the comparison of data in Table 6, when different first additives are selected and used in combination with the same second additive, both the battery's cycle characteristics and storage characteristics are improved, but the degree of improvement differs. Furthermore, as can be seen from the comparison of data in Examples 1 and 31-42, the amount of first and second additives used, and their ratio, both affect the improvement effect on the battery's cycle characteristics and storage characteristics. In particular, when W1 / W2 is between 0.05 and 5, a clear improvement was obtained in the battery's cycle characteristics, storage characteristics, and volume expansion rate. As can be seen from the comparison of data in Examples 43-52, the porosity of the negative electrode film layer on the negative electrode side and the D of the negative electrode active material V All of the values ​​of 50 affect the improvement of the battery's cycle characteristics, storage characteristics, and volume expansion rate.

[0164] While the present application has been described with reference to preferred embodiments, various improvements and substitutions of components with equivalents can be made without departing from the scope of the application. In particular, each technical feature mentioned in each embodiment can be combined in any manner, provided that there is no structural inconsistency. The present application is not limited to the specific embodiments disclosed herein and includes all technical solutions included in the claims. [Explanation of Symbols]

[0165] 1 Battery pack 2 Upper cabinet 3 Lower cabinet 4 Battery Modules 5 Secondary battery 51 Housing 52 Electrode Assembly 53. Cap assembly.

Claims

1. A non-aqueous electrolyte containing additives, The additive comprises a first additive and a second additive, the first additive comprises one or more cyclic sulfate ester compounds having the structure shown in general formula (I), 【Chemistry 1】 R １ , R ２ , R ３ and R ４ Each of the following is independently selected from a group having the structure shown in general formula (II), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and n1 and n2 are independently any integer from 0 to 2. General formula (II) is 【Chemistry 2】 And, R ５ and R ６ Each of these is independently selected from one of the following: a group having the structure shown in the general formula (II), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and n3 is any integer from 0 to 2. The second additive comprises one or more cyclic carbonate ester compounds having a structure represented by general formula (III) or general formula (IV), 【Transformation 3】 In general formula (III), R ７ , R ８ are each independently selected from any one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, *R １３ -O-R １４ , *=CR １５ R １６ , and R １３ is a C1-C6 alkylene group, a C1-C6 haloalkylene group, a C2-C6 alkenylene group, or a C2-C6 alkynylene group, and R １４ , R １５ , R １６ are each independently any one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, or a C2-C6 alkynyl group, * indicates the bonding site, 【Chemistry 4】 In general formula (IV), R ９ , R １０ , R １１ , R １２ Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and *R １３ -O-R １４ , * = CR １５ R １６ One of the following is selected, R １３ R consists of a C1-C6 alkylene group, a C1-C6 haloalkylene group, a C2-C6 alkenylene group, and a C2-C6 alkynylene group. １４ , R １５ , R １６ Each of these is independently one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, or a C2-C6 alkynyl group, and * indicates a bonding site, and R ９ , R １０ , R １１ , R １２ It is a non-aqueous electrolyte that is not composed of hydrogen atoms.

2. R １ and R ２ It is not a hydrogen atom at the same time, and R ３ and R ４ At the same time, it is not a hydrogen atom, Or, R １ , R ２ , R ３ , R ４ , R ５ and R ６ teeth, R １ and R ２ It is simultaneously a hydrogen atom, and R ３ and R ４ One of the atoms is a hydrogen atom and the other is one of the following: a group having the structure shown in general formula (II), a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and R in the group having the structure shown in general formula (II) ５ and R ６ It also satisfies the condition that it is not a hydrogen atom, Or, R １ , R ２ , R ３ , R ４ , R ５ and R ６ teeth, R ３ and R ４ It is simultaneously a hydrogen atom, and R １ and R ２ One of the atoms is a hydrogen atom and the other is one of the following: a group having the structure shown in general formula (II), a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group, and R in the group having the structure shown in general formula (II) ５ and R ６ The non-aqueous electrolyte according to claim 1, which satisfies the condition that it is not a hydrogen atom at the same time.

3. The cyclic sulfate ester compound has the structure shown in general formula (I-1), 【Transformation 5】 R １ , R ２ , R ３ and R ４ Each of these is independently selected from one of the following: a group having the structure shown in general formula (II-1), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group. The general formula (II-1) is 【Transformation 6】 and R ５ and R ６ The non-aqueous electrolyte according to claim 1 or 2, wherein each of these is independently selected from one of the following: a group having the structure shown in general formula (II-1), a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C1-C6 alkoxy group, a C1-C6 haloalkoxy group, a C2-C6 alkenyl group, a C2-C6 ester group, a cyano group, and a sulfonic acid group.

4. R １ , R ２ , R ３ , R ４ , R ５ and R ６ Each of these is independently selected from one of the following: a group having the structure shown in general formula (II-1), a hydrogen atom, a halogen atom, a C1-C3 alkyl group, a C1-C3 haloalkyl group, a C1-C3 alkoxy group, a C1-C3 haloalkoxy group, a C2-C3 alkenyl group, a C1-C3 ester group, a cyano group, and a sulfonic acid group. Selectively, R １ , R ２ , R ３ , R ４ , R ５ and R ６ Each of these is independently selected from one of the following: a group having the structure shown in general formula (II-1), a hydrogen atom, a halogen atom, a C1-C3 alkyl group, or a C1-C3 haloalkyl group. Selectively, R １ , R ２ , R ３ , R ４ , R ５ and R ６ Each of these is independently selected from one of the following: a group having the structure shown in general formula (II-1), a hydrogen atom, a F atom, a Cl atom, a Br atom, a methyl group, an ethyl group, a propyl group, and an isopropyl group. Selectively, the base of the structure shown in the general formula (II-1) is 【Transformation 7】 One of the following groups is selected, where X is an F atom, a Cl atom, or a Br atom. Selectively, R １ , R ２ , R ３ and R ４ Each is independent of the others. 【Transformation 8】 X is selected from one of the following: hydrogen atom, F atom, Cl atom, Br atom, methyl group, ethyl group, propyl group, and isopropyl group, and X is an F atom. Further selectively, R １ , R ２ , R ３ and R ４ are each independently 【Chemistry 9】 A non-aqueous electrolyte according to any one of claims 1 to 3, wherein X is selected from one of a hydrogen atom, a methyl group, and an ethyl group, and X is an F atom.

5. The aforementioned cyclic sulfate ester compound is 【Chemistry 10】 A non-aqueous electrolyte according to claim 1, selected from any one or more of the compounds.

6. The aforementioned R ７ , R ８ Each of these is independently selected from one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, a C1-C4 alkoxy group, a C2-C4 alkenyl group, or a C2-C4 alkynyl group. Selectively, the R ７ , R ８ Each of these is independently selected from one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, or a C2-C4 alkenyl group. Optionally, said R ７ , R ８ are each independently selected from any one of a hydrogen atom, a halogen atom, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a halomethyl group, a haloethyl group, a halopropyl group, a vinyl group, and an allyl group, Selectively, the R ７ , R ８ Each of these is independently selected from one of the following: hydrogen atom, halogen atom, methyl group, ethyl group, n-propyl group, isobutyl group, halomethyl group, haloethyl group, vinyl group. Selectively, the halogen atom is an F atom, a Cl atom, and more selectively, an F atom. Selectively, the cyclic carbonate ester compound having the general formula (III) is 【Chemistry 11】 A non-aqueous electrolyte according to any one of claims 1 to 5, selected from any one or more of the compounds.

7. R ９ , R １０ , R １１ , R １２ Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, a C1-C4 alkoxy group, a C2-C4 alkenyl group, a C2-C4 alkynyl group, and *R １３ -O-R １４ , * = CR １５ R １６ One of the following is selected, R １３ R is a C1-C4 alkylene group, a C1-C4 haloalkylene group, a C2-C4 alkenylene group, and a C2-C4 alkynylene group. １４ , R １５ , R １６ Each of these is independently one of the following: a hydrogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, a C2-C4 alkenyl group, or a C2-C4 alkynyl group. Selectively, R ９ , R １０ , R １１ , R １２ Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C1-C4 haloalkyl group, a C2-C4 alkenyl group, a C2-C4 alkynyl group, and *R. １３ -O-R １４ , * = CR １５ R １６ One of the following is selected, R １３ R is a C1-C4 alkylene group, a C2-C4 alkenylene group, and a C2-C4 alkynylene group. １４ , R １５ , R １６ Each of these is independently one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C2-C4 alkenyl group, or a C2-C4 alkynyl group. Selectively, R ９ , R １０ , R １１ , R １２ Each of these is independently a hydrogen atom, a halogen atom, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, a halomethyl group, a haloethyl group, a halopropyl group, a vinyl group, an allyl group, an ethinyl group, a propynyl group, and *methylene-O-R １４ *Ethylene-O-R １４ , * = CR １５ R １６ One of the following is selected, R １４ R is one of the following: hydrogen atom, methyl group, ethyl group, vinyl group, or ethynyl group. １５ , R １６ Each of these is independently a hydrogen atom or an F atom, Selectively, the halogen atom is an F atom, a Cl atom, and more selectively, an F atom. Selectively, the cyclic carbonate ester compound having the general formula (IV) is 【Chemistry 12】 A non-aqueous electrolyte according to any one of claims 1 to 6, selected from any one or more of the compounds.

8. The mass ratio of the first additive in the non-aqueous electrolyte is W1, and W1 is selectively between 0.001% and 20%, and more selectively between 0.1% and 5%. and / or the mass ratio of the second additive in the non-aqueous electrolyte is W2, where W2 is selectively between 0.001% and 20%, and more selectively between 0.1% and 5%. A non-aqueous electrolyte according to any one of claims 1 to 7, wherein selectively, 0.01 ≤ W1 / W2 ≤ 10, and preferably 0.05 ≤ W1 / W2 ≤ 5.

9. The non-aqueous electrolyte further comprises an electrolyte containing an alkali metal salt-based electrolyte, wherein the electrolyte selectively comprises a lithium salt or a sodium salt, wherein the lithium salt selectively comprises one or more selected from the group consisting of lithium hexafluorophosphate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide and lithium bistrifluoromethanesulfonylimide, and the sodium salt comprises one or more selected from the group consisting of sodium hexafluorophosphate, sodium difluorooxalatoborate, sodium perchlorate, sodium bis(fluorosulfonyl)imide, sodium bis(trifluoromethanesulfonyl)imide and sodium trifluoromethanesulfonate, as described in any one of claims 1 to 8.

10. The non-aqueous electrolyte according to any one of claims 1 to 9, wherein the non-aqueous electrolyte further comprises a non-aqueous solvent, which selectively comprises one or more selected from the group consisting of cyclic carbonate esters, linear carbonate esters, nitrile solvents, ketone solvents and sulfone solvents, and further selectively comprises one or more selected from the group consisting of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, ethyl methyl sulfone, diethyl sulfone, tetrahydrofuran, ethylene glycol dimethyl ether, dioxolane, acetone, acetonitrile and butyronitrile.

11. The non-aqueous electrolyte according to any one of claims 1 to 10, wherein the additive further comprises one or more selected from the group consisting of sulfate ester compounds, sulfite ester compounds, sultone compounds, disulfonic acid compounds, nitrile compounds, aromatic compounds, isocyanate compounds, phosphazene compounds, cyclic acid anhydride compounds, phosphite ester compounds, phosphate ester compounds, borate ester compounds, and carboxylic acid ester compounds.

12. A secondary battery comprising a positive electrode sheet, an electrolyte, a separator, and a negative electrode sheet, wherein the electrolyte comprises a non-aqueous electrolyte as described in any one of claims 1 to 11.

13. The negative electrode sheet includes a negative electrode current collector and a negative electrode film layer installed on one or both sides of the negative electrode current collector, wherein the porosity of the negative electrode film layer is selectively 30% to 45%, and selectively 37% to 42%. The negative electrode film layer contains a negative electrode active material, and selectively, the D of the negative electrode active material Ｖ 50 ≥ 6 μm, and further selectively, the D of the negative electrode active material. Ｖ The secondary battery according to claim 12, wherein 50 is between 15 μm and 20 μm.

14. A power consumption device including a secondary battery, wherein the secondary battery is the secondary battery described in claim 12 or 13.

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