Non-aqueous electrolyte, secondary batteries and power consumption devices

Abstract

The embodiments of this application provide a non-aqueous electrolyte, a secondary battery, and a power consumption device. The non-aqueous electrolyte includes an additive, the additive comprising a first additive and a second additive, the first additive being any one or more cyclic sulfate ester compounds having a structure represented by general formula (I), and the second additive being an organic base additive, the organic base additive comprising any one or more from the group consisting of 5-12 membered aromatic heterocyclic organic bases or 5-12 membered aliphatic heterocyclic organic bases, the ring structure of the 5-12 membered aromatic heterocyclic organic base and the 5-12 membered aliphatic heterocyclic organic base contains a nitrogen atom. JPEG2026518320000083.jpg4571

Description

[Technical Field]

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

[0002] In the case of lithium-ion batteries, increased resistance and decreased capacity during high-temperature cycling and storage are serious performance degradation problems, and side reactions caused by electrolyte degradation at high temperatures (particularly degradation due to the decomposition of LiPF6 at high temperatures) are one of the causes of the above problems. HF generated by the decomposition of LiPF6 destroys the solid electrolyte interface film (SEI film) on the positive and negative electrode surfaces, which can result in excessive electrolyte decomposition and subsequent self-discharge.

[0003] In particular, for the negative electrode in lithium-ion batteries, graphite-based negative electrodes are mainly used. In the case of graphite, its operating potential is 0.3V (relative to Li / Li+) or less (lower than the electrochemical stability window of the electrolyte used in lithium-ion batteries), so the electrolyte currently in use is reduced and decomposed. The products of reduction and decomposition can form an SEI film that suppresses further decomposition of the electrolyte. However, if the SEI film does not have enough passivation capacity to suppress further decomposition of the electrolyte, the electrolyte will decompose further during storage, causing the charged graphite to self-discharge, resulting in a decrease in the overall potential of the battery.

[0004] One factor that may affect the passivation ability of the SEI film is the acids produced by the thermal decomposition of LiPF6 (a lithium salt widely used in lithium-ion batteries), such as HF and PF5. When the electrode surface deteriorates due to acid erosion, transition metal elution occurs at the positive electrode, which can increase resistance and reduce capacity due to the loss of redox centers. As these eluted metal ions electrodeposit to the negative electrode, irreversible capacity increases due to electron consumption from metal electrodeposition and further decomposition of the electrolyte. As a result, not only does the battery capacity decrease, but resistance may also increase, and the laphite negative electrode may self-discharge. [Overview of the Initiative]

[0005] This application provides a non-aqueous electrolyte, a secondary battery, and a power consumption device for improving the cycle performance and storage performance of batteries.

[0006] A first aspect of this application provides a non-aqueous electrolyte containing an additive, the additive comprising a first additive and a second additive, the first additive being any one or more cyclic sulfate ester compounds having a structure represented by general formula (I), [ka] Here, R 1 , R 2 , R3 and R4 Each of these is independently selected from any one of the following: a group having the structure represented by 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 each independently any integer from 0 to 2. General formula (II) is [ka] And, R 5 and R 6is independently selected from any one of a group consisting of a group having a structure represented by 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, n3 is an arbitrary integer from 0 to 2, The second additive is an organic base additive, and the organic base additive contains any one or more in the group consisting of a 5- to 12-member aromatic heterocyclic organic base or a 5- to 12-member aliphatic heterocyclic organic base. The ring structures of the 5- to 12-member aromatic heterocyclic organic base and the 5- to 12-member aliphatic heterocyclic organic base contain a nitrogen atom.

[0007] The cyclic sulfate in the non-aqueous electrolyte forms a good passive film on the positive electrode side and the negative electrode side during the first charge process of the lithium-ion battery, reduces the destruction of the positive electrode and the negative electrode by the acid generated by the decomposition of the lithium salt in the electrolyte, and reduces the elution of transition metals on the positive electrode side and the further decomposition of the electrolyte on the negative electrode side. At the same time, the non-aqueous electrolyte contains the above-mentioned second additive, which can effectively remove the acid generated by the decomposition of the lithium salt in the electrolyte, further reduce the acidity of the electrolyte, and reduce the destruction of the positive electrode and the negative electrode interfaces. Due to the synergistic effect of the two kinds of additives, the destruction of the positive electrode and the negative electrode by the acid generated by the decomposition of the lithium salt is significantly reduced, and the decomposition of the solid electrolyte interface film or the elution of transition metals on the positive electrode during the high-temperature cycle and storage process can be effectively alleviated, achieving the purpose of effectively improving the cycle performance and storage performance of the battery.

[0008] In any embodiment of the first aspect, R 1 and R 2 are not hydrogen atoms at the same time, and R 3 and R 4 are not hydrogen atoms at the same time.

[0009] In any embodiment of the first aspect, R 1 , R 2 , R 3 , R 4 , R 5 and R6 The following conditions are met, R 1 and R 2 It is also a hydrogen atom, and R 3 and R 4 R is any 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 is 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 are met, R 3 and R 4 It is also a hydrogen atom, and R 1 and R 2 R is any 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 is 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.

[0011] In any embodiment of the first aspect, the cyclic sulfate ester compound has a structure represented by general formula (I-1), [ka] R 1 , R 2 , R 3 and R 4Each of these is independently selected from any one of the following: a group having the structure represented by 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 any one of the following: a group having the structure represented by 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.

[0012] In the embodiment of the first aspect, R 1 , R 2 , R 3 and R 4 , R 5 and R 6 Each of these is independently selected from any one of the following: a group having the structure represented by 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.

[0013] In any embodiment of the first aspect, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 Each of these is independently selected from any one of the following: a group having the structure represented by general formula (II-1), a hydrogen atom, a halogen atom, a C1-C3 alkyl group, and a C1-C3 haloalkyl group.

[0014] In any embodiment of the first aspect, R1 , R 2 , R 3 , R 4 , R 5 and R 6 Each of these is independently selected from any one of the following: a group having the structure represented by 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.

[0015] In any embodiment of the first aspect, the base of the structure represented by general formula (II-1) is [ka] The group is chosen from any one of the following, where X is a F atom, a Cl atom, or a Br atom.

[0016] In any embodiment of the first aspect, R 1 , R 2 , R 3 and R 4 Each is independent [ka] [ka] X is selected from any one of the following: hydrogen atom, fluorine atom, chlorine atom, brown atom, methyl group, ethyl group, propyl group, and isopropyl group, and X is a fluorine atom.

[0017] In any embodiment of the first aspect, R 1 , R 2 , R 3 and R 4 Each is independent [ka] X is a fluorine atom, selected from any one of a hydrogen atom, a methyl group, and an ethyl group.

[0018] In any embodiment of the first aspect, the cyclic sulfate compound is [ka] [ka] One or more of the following compounds are selected.

[0019] In any embodiment of the first aspect, the 5- to 12-membered aromatic heterocyclic organic base includes one or more compounds selected from the group consisting of compounds having the structure represented by general formula (III), compounds having the structure represented by general formula (IV), and compounds having the structure represented by general formula (V), where, [ka] In general formula (III), Y 1 , Y 2 These are C and N elements, respectively, and R 31 , R 32 , R 33 These are, independently, a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and -R 34 OH, -R 35 NR 36 R 37 , -R 38 -OR 39 Choose any one of the following, R 34 , R 35 , R 38 Each is independently selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group, R 36 , R 37 , R 39 Each is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, or a C1-C6 haloalkyl group, and R 36 , R 37 , R 39 Any carbon atom of the C1-C6 alkyl group is selectively substituted with a heteroatom, where the heteroatom is an N atom, an S atom, or a P atom, and selectively R 36 and R 37 They combine to form a ring, [Chemical formula] In general formula (IV), W 1 is C, N, O or S, and W 2 is C or N, and W 1 and W 2 at least one of them is N, and R 41 , R 42 , R 43 , R 44 are each independently a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, -R 45 OH, -R 46 NR 47 R 48 , -R 49 -O-R 50 selected from any one of them, and R 45 , R 46 , R 49 are each independently selected from any one of a C0-C6 alkylene group and a C2-C6 alkenylene group, and R 47 , R 48 , R 50 are each independently selected from any one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, and a C1-C6 haloalkyl group. [Chemical formula] In general formula (V), A 1 , A 2 , A 3 , A 4 , A 5 , A 6 , A 7 are each independently C or N, and R 51 , R 52 , R 53 , R 54 , R 55 , R 56 , R 57 are a hydrogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, -OH, -R 58 NR 59 R 60, any one of the alkoxy groups, R 58 R is selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group. 59 , R 60 Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, or a C1-C6 haloalkyl group.

[0020] In any embodiment of the first aspect, in general formula (III), R 31 , R 32 , R 33 These are, independently, a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C3-C5 alkenyl group, a C3-C5 alkynyl group, and -R 34 OH, -R 35 NR 36 R 37 , -R 38 -OR 39 Choose any one of the following, R 34 , R 35 , R 38 Each is independently selected from any one of the C0-C3 alkylene groups, R 36 , R 37 , R 39 Each is independently selected from any one of a hydrogen atom, a halogen atom, a C1-C3 alkyl group, or a C1-C3 haloalkyl group, and R 36 , R 37 , R 39 Any carbon atom of a C1-C6 alkyl group is selectively substituted with a heteroatom, where the heteroatom is N and selectively R 36 and R 37 These combine to form a 5-membered aliphatic heterocycle or a 6-membered aliphatic heterocycle.

[0021] In any embodiment of the first aspect, R 31 , R 32 , R 33 These are, independently, a hydrogen atom, a halogen atom, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an allyl group, a propargyl group, -OH, -CH3OH, -NH2, -CH2NH2, -N(CH3)2, O-CH3, [ka] Selected from any one of the following, selectively, R 31 , R 32 , R 33 These are, independently, a hydrogen atom, a F atom, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, -CH3OH, -CH2NH2, -N(CH3)2, and O-CH3. [ka] It is selected from any one of the following.

[0022] In any embodiment of the first aspect, a compound having the structure represented by general formula (III) is [ka] Selected from any one or more of the following compounds:

[0023] In any embodiment of the first aspect, in general formula (IV), W 1 N is W 2 is either C or N.

[0024] In any embodiment of the first aspect, R 41 , R 42 , R 43 , R 44 These are, independently, a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C3-C5 alkenyl group, a C3-C5 alkynyl group, and -R 44 OH, -R 45 NR 46 R 47 , -R 48 -OR 49 Choose any one of the following, R 44 , R 45 , R 48 Each is independently selected from any one of the C0-C4 alkylene groups, R 46 , R 47 , R 49Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, or a C1-C4 haloalkyl group.

[0025] In any embodiment of the first aspect, R 41 , R 42 , R 43 , R 44 Each of these is independently selected from any one of the following: hydrogen atom, F atom, methyl group, ethyl group, propyl group, cyclopropyl group, allyl group, propargyl group, -OH, -CH3OH, -NH2, -NHCH3, -CH2NH2, -N(CH3)2, and O-CH3.

[0026] In any embodiment of the first aspect, R 41 , R 42 , R 43 , R 44 Each of these is independently selected from any one of the following: hydrogen atom, F atom, methyl group, propyl group, cyclopropyl group, allyl group, -CH3OH, -NH2, -NHCH3, and -N(CH3)2.

[0027] In any embodiment of the first aspect, a compound having the structure represented by general formula (IV) is [ka] One or more of the following compounds are selected.

[0028] In any embodiment of the first aspect, in general formula (V), A 1 N is A 2 , A 3 , A 4 , A 5 , A 6 , A 7 Each of these is independently either C or N.

[0029] In any embodiment of the first aspect, R 51 , R 52 , R 53 , R 54 , R 55 , R 56 , R57 These are hydrogen atoms, C1-C4 alkyl groups, C2-C4 alkenyl groups, C2-C4 alkynyl groups, -OH, -R 58 NR 59 R 60 , any one of the alkoxy groups, R 58 R is selected from any one of the C0-C3 alkylene groups. 59 , R 60 Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C3 alkyl group, or a C1-C3 haloalkyl group.

[0030] In any embodiment of the first aspect, R 51 , R 52 , R 53 , R 54 , R 55 , R 56 , R 57 is any one of the following: a hydrogen atom, a methyl group, an ethyl group, an allyl group, a propargyl group, -OH, -NH2, -CH2NH2, -N(CH3)2, or O-CH3.

[0031] In any embodiment of the first aspect, R 51 , R 52 , R 53 , R 54 , R 55 , R 56 , R 57 is any one of the following: a hydrogen atom, a methyl group, an ethyl group, or O-CH3.

[0032] In any embodiment of the first aspect, a compound having the structure represented by general formula (V) is [ka] One or more of the following compounds are selected.

[0033] In any embodiment of the first aspect, the 5- to 12-membered aliphatic heterocyclic organic base includes one or more compounds selected from the group consisting of compounds having the structure represented by general formula (VI) and compounds having the structure represented by general formula (VII), where, [ka] In general formula (VI), X 1 , X 2 , X 3 Each of them is independently C or N, and at least one of them is always N, a and b are each independently integers from 0 to 3, and each R 61 These are, independently, a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and -R 62 OH, -R 63 NR 64 R 65 , -R 66 -OR 67 Choose any one of the following, R 62 , R 63 , R 64 Each is independently selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group, R 65 , R 66 , R 67 Each is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, or a C1-C6 haloalkyl group. [ka] In general formula (VI), V 1 , V 2 , V 3 Each of them is independently either C or N, and at least one of them is always N, d is an integer from 0 to 3, and each R 71 These are, independently, a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and -R 72 OH, -R 73 NR 74 R 75 , -R 76 -OR 77 Choose any one of the following, R 72 , R 73 , R 74Each is independently selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group, R 75 , R 76 , R 77 Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, or a C1-C6 haloalkyl group.

[0034] In any embodiment of the first aspect, in general formula (VI), X 1 N is X 2 , X 3 Each of these is independently either C or n.

[0035] In any embodiment of the first aspect, a and b are independently 0, 1, or 2.

[0036] In any embodiment of the first aspect, each R 61 These are, independently, a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C3-C5 alkenyl group, a C3-C5 alkynyl group, and -R 62 OH, -R 63 NR 64 R 65 , -R 66 -OR 67 Choose any one of the following, R 62 , R 63 , R 64 Each is independently selected from any one of the C0-C3 alkylene groups, R 65 , R 66 , R 67 Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, or a C1-C4 haloalkyl group.

[0037] In any embodiment of the first aspect, each R 61 Each of these is independently selected from any one of the following: a hydrogen atom, a fluorine atom, a methyl group, an ethyl group, a hydroxyl group, -NH2, or -N(CH3)2.

[0038] In any embodiment of the first aspect, a compound having the structure represented by general formula (VI) is [ka] One or more of the following compounds are selected.

[0039] In any embodiment of the first aspect, in general formula (VII), d is 0 or 1.

[0040] In any embodiment of the first aspect, R 71 These are, independently, a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C3-C5 alkenyl group, a C3-C5 alkynyl group, and -R 72 OH, -R 73 NR 74 R 75 , -R 76 -OR 77 Choose any one of the following, R 72 , R 73 , R 74 Each is independently selected from any one of the C0-C3 alkylene groups, R 75 , R 76 , R 77 Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, or a C1-C4 haloalkyl group.

[0041] In any embodiment of the first aspect, each R 71 Each of these is independently selected from any one of the following: hydrogen atom, F atom, methyl group, ethyl group, n-propyl group, isopropyl group, hydroxyl group, -NH2, and -N(CH3)2.

[0042] In any embodiment of the first aspect, each R 71 Each of these is independently selected from any one of the following: a hydrogen atom, a fluorine atom, a methyl group, an ethyl group, an n-propyl group, or an isopropyl group.

[0043] In any embodiment of the first aspect, a compound having the structure represented by general formula (VII) is [ka] One or more of the following compounds are selected.

[0044] In any embodiment of the first aspect, the mass percentage of the first additive in the non-aqueous electrolyte is W1, and selectively W1 is 0.001% to 20%, and more selectively W1 is 0.1% to 5%.

[0045] In any embodiment of the first aspect, the mass ratio of the second additive in the non-aqueous electrolyte is W2, and selectively W2 is 0.001% to 20%, and more selectively W2 is 0.1% to 5%.

[0046] In any embodiment of the first aspect, 0.01 ≤ W1 / W2 ≤ 10, preferably 0.05 ≤ W1 / W2 ≤ 5.

[0047] In any embodiment of the first aspect, the non-aqueous electrolyte further comprises an electrolyte, optionally comprising an alkali metal salt electrolyte, optionally comprising a lithium salt or a sodium salt, optionally comprising one or more selected from the group consisting of lithium hexafluoride phosphate, lithium perchlorate, lithium hexafluoride arsenate, lithium bisfluorosulfonylimide and lithium bistrifluoromethanesulfonylimide, and sodium salt comprising one or more selected from the group consisting of sodium hexafluoride phosphate, sodium difluorooxalatoborate, sodium perchlorate, sodium bisfluorosulfonylimide, sodium bistrifluoromethanesulfonylimide and sodium trifluoromethanesulfonate.

[0048] In any embodiment of the first aspect, the non-aqueous electrolyte further comprises a non-aqueous solvent, which optionally comprises one or more selected from the group consisting of cyclic carbonates, linear carbonates, nitrile solvents, ketone solvents and sulfone solvents, and further optionally 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, methyl ethyl sulfone, diethyl sulfone, tetrahydrofuran, ethylene glycol dimethyl ether, dioxolane, acetone, acetonitrile and butyronitrile.

[0049] In any embodiment of the first aspect, 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.

[0050] A second aspect of this 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.

[0051] In any embodiment of the second aspect, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer installed on one or both sides of the negative electrode current collector, wherein the porosity of the negative electrode active material layer is 30% to 45%, selectively 37% to 42%.

[0052] In any embodiment of the second aspect, the negative electrode active material layer comprises 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 50 corresponds to a size of 15 μm to 20 μm.

[0053] A third aspect of this application provides a power consumption device including a secondary battery, the secondary battery including any one of the secondary batteries of the second aspect described above. [Brief explanation of the drawing]

[0054] To more clearly illustrate the technical concept in the embodiments of this application, the drawings necessary for the embodiments of this application are briefly described below. However, it is clear that the drawings described 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.

[0055] [Figure 1] This is a schematic diagram of a secondary battery according to one embodiment of the present application. [Figure 2] Figure 1 is an exploded view of a secondary battery according to one embodiment of this application. [Figure 3] This is a schematic diagram of a battery module according to one embodiment of the present application. [Figure 4] This is a schematic diagram of a battery pack according to one embodiment of the present application. [Figure 5] Figure 4 is an exploded view of a battery pack according to one embodiment of this application. [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 application.

[0056] In the drawings, each drawing is not drawn to the actual scale. [Explanation of symbols]

[0057] 1: Battery pack, 2: Upper casing, 3: Lower casing, 4: Battery module, 5: Rechargeable battery, 51: Case, 52: Electrode assembly, 53: Top cover assembly. [Modes for carrying out the invention]

[0058] Embodiments of this 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 this application, but are not intended to limit the scope of this application, that is, this application is not limited to the embodiments described.

[0059] The embodiments of the non-aqueous electrolyte, secondary battery, and power consumption device disclosed in this application will be described in detail below, with appropriate reference to the drawings. 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 accompanying drawings and the following explanation are provided to enable those skilled in the art to fully understand this disclosure and are not intended to limit the subject matter described in the claims.

[0060] The "ranges" disclosed in this application are limited in the form of a lower limit and an upper limit. A given range is limited by selecting one lower limit and one upper limit, and the selected lower limit and upper limit define the boundaries of a specific range. The ranges thus defined may or may not include the end values, and any combination is possible, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60 - 120 and 80 - 110 are listed for a specific parameter, it is understood that ranges of 60 - 110 and 80 - 120 are also conceivable. In addition, if 1 and 2 are listed as the minimum range values, and 3, 4, and 5 are listed as the maximum range values, all of the ranges of 1 - 3, 1 - 4, 1 - 5, 2 - 3, 2 - 4, and 2 - 5 are conceivable. In this application, unless otherwise specified, the numerical range of "a - b" represents a shortened expression of any combination of real numbers from a to b, where a and b are both real numbers. For example, the numerical range "0 - 5" represents that all real numbers between "0 - 5" have already been listed in this specification, and "0 - 5" is only a shortened expression of the combinations of these numerical values. Also, when it is expressed that a certain parameter is an integer ≧ 2, this is equivalent to disclosing that this parameter is, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0061] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined with each other to form a new technical solution.

[0062] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0063] Unless otherwise specified, all steps of this application may be performed in order or randomly, and preferably, they are performed in order. For example, the fact that the method includes steps (a) and (b) means that the method may include steps (a) and (b) performed in order, or steps (b) and (a) performed in order. For example, the fact that the method mentioned 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), may include steps (a), (c), and (b), may include steps (c), (a), and (b), etc.

[0064] Unless otherwise specified, the terms "comprising" and "including" mentioned in this application represent an open type and may also be a closed type. For example, the "comprising" and "including" may further include or contain other components not listed, or may include or contain only the components listed.

[0065] Unless otherwise specified, in this application, the term "or" is inclusive. For example, the phrase "A or B" represents "A, B, or both A and B". More specifically, any one of the conditions that A is true (or exists) and B is false (or does not exist), A is false (or does not exist) and B is true (or exists), or both A and B are true (or exist) satisfies the condition of "A or B".

[0066] [Secondary battery]

[0067] A secondary battery, also called a rechargeable battery or a storage battery, refers to a battery that can continue to be used by activating the active material through charging after the battery is discharged.

[0068] 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) move back and forth between the positive and negative electrode sheets, undergoing intercalation and deintercalation. 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.

[0069] [Nonaqueous electrolyte]

[0070] In one embodiment of this application, a non-aqueous electrolyte containing an additive is provided, the additive comprising a first additive and a second additive, the first additive being any one or more cyclic sulfate ester compounds having a structure represented by general formula (I), [ka] Here, R 1 , R 2 , R 3 and R 4 Each of these is independently selected from any one of the following: a group having the structure represented by 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 each independently any integer from 0 to 2. General formula (II) is, [ka] And, R 5 and R 6Each of these is independently selected from any one of the following: a group having the structure represented by 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 an organic base additive, which comprises any one or more organic bases from the group consisting of 5-12 member aromatic heterocyclic organic bases or 5-12 member aliphatic heterocyclic organic bases, the ring structure of the 5-12 member aromatic heterocyclic organic bases and the 5-12 member aliphatic heterocyclic organic bases contains a nitrogen atom.

[0071] The cyclic sulfate ester in the non-aqueous electrolyte forms a good passivation film on both the positive and negative electrode sides during the initial charging process of the lithium-ion battery, reducing the destruction of the positive and negative electrodes by acids generated by the decomposition of lithium salts in the electrolyte, and further reducing the leaching of transition metals on the positive electrode side and the decomposition of the electrolyte on the negative electrode side. Furthermore, the non-aqueous electrolyte contains the second additive, which effectively removes acids generated by the decomposition of lithium salts in the electrolyte, further reducing the acidity of the electrolyte and mitigating damage to the positive and negative electrode interfaces. The synergistic effect of the two additives significantly reduces the destruction of the positive and negative electrodes by acids generated by the decomposition of lithium salts, and effectively mitigates the decomposition of the solid electrolyte interface film or the leaching of transition metals at the positive electrode during high-temperature cycling and storage processes, thereby effectively improving the battery's cycle performance and storage performance.

[0072] In some embodiments, the above R 1 and R 2 It is not a hydrogen atom, but R 3 and R 4 It is not a hydrogen atom at the same time. Of course, R 1 , R 2 , R 3 , R 4 This could also be a hydrogen atom.

[0073] In some embodiments, R1 , R 2 , R 3 , R 4 , R 5 and R 6 The following conditions are met, R 1 and R 2 It is also a hydrogen atom, and R 3 and R 4 R is any 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 is 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.

[0074] In some embodiments, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 The following conditions are met, R 3 and R 4 It is also a hydrogen atom, and R 1 and R 2 R is any 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 is 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.

[0075] The above R 1 , R 2 , R 3 and R 4The base has substituents, and by introducing substituents such as alkyl groups, an elastic SEI film with longer organic chains can be generated on the anode, preventing the SEI film from breaking down in response to volume changes of the anode during the cycle. By introducing substituents including F and N, which are involved in film formation on the anode, an SEI film richer in more inorganic components such as LiF and Li3N can be generated, improving the mechanical strength of the SEI film, thereby improving the stability of the anode SEI film and achieving the objective of further improving battery cycle performance.

[0076] 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, a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a cyclopropyl group, a cyclobutane group, etc. The alkyl group in the above haloalkyl group may be a linear alkyl group, a branched alkyl group, or a cycloalkyl group, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a cyclopropyl group, a cyclobutane 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 may be any of the alkyl groups. One or more hydrogen atoms are substituted on the alkoxy group, and the alkoxy group includes, but is not limited to, a cyclopropane group, an oxetanyl group, etc., and the halogen atom in the haloalkoxy group may be a fluorine atom, a chlorine atom, or a bromine atom, and the halogen atom substitutes on any one or more hydrogen atoms on the alkoxy group, and the alkenyl group includes, but is not limited to, -CH=CH2, -CH=CH2CH3, -CH2CH=CH2, and -CH2CH=CH2CH3, and the ester group includes, but is not limited to, a methyl formate group, an ethyl formate group, an ethyl acetate group, a methyl propionate group, an ethyl propionate group, a propyl propionate group, etc.

[0077] In some embodiments, the cyclic sulfate ester compound has the structure shown in formula (I-1), [ka] R 1 、R 2 、R 3 and R 4 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-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

Chemical formula

[0078] The cyclic sulfate rings in the general formula (I-1) are all five-membered rings and can form a denser SEI film. Compared with six-membered rings, the ring strain is larger, and it is easier to form a film on the positive and negative electrodes. In contrast, six-membered rings have a small ring strain, high stability, and slow film formation on the negative electrode film, so the efficiency of generating an SEI film that blocks electrons is low, which affects the performance of the SEI film.

[0079] In some embodiments, R1, R2, R3 and R4, R5 and R6 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.

[0080] In some embodiments, R1, R2, R3, R4, R5, and R6 are each independently selected from any one of the following: a group having the structure represented by general formula (II-1), a hydrogen atom, a halogen atom, a C1-C3 alkyl group, and a C1-C3 haloalkyl group.

[0081] In some embodiments, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 Each of these is independently selected from any one of the following: a group having the structure represented by 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.

[0082] In some embodiments, the base of the structure represented by the above general formula (II-1) is [ka] [ka] The group is chosen from any one of the following, where X is a F atom, a Cl atom, or a Br atom.

[0083] In some embodiments, R 1 , R 2 , R 3 and R 4 Each is independent [ka] X is selected from any one of the following: hydrogen atom, fluorine atom, chlorine atom, brown atom, methyl group, ethyl group, propyl group, and isopropyl group, and X is a fluorine atom.

[0084] In some embodiments, R 1 , R 2 , R 3 and R 4 Each is independent [ka] X is a fluorine atom, selected from any one of a hydrogen atom, a methyl group, and an ethyl group.

[0085] In some embodiments, the above cyclic sulfate ester compound is [ka] One or more of the following compounds are selected.

[0086] Some of the above-mentioned methods for producing cyclic sulfate ester compounds are simpler, more readily available and implementable industrially, and provide more stable improvements to the lifespan of secondary batteries.

[0087] In some embodiments, the 5-12 membered aromatic heterocyclic organic base includes one or more compounds selected from the group consisting of compounds having the structure shown in general formula (III), compounds having the structure shown in general formula (IV), and compounds having the structure shown in general formula (V), where, [ka] In general formula (III), Y 1 , Y 2 These are C and N elements, respectively, and R 31 , R 32 , R 33 These are, independently, a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and -R 34 OH, -R 35 NR 36 R 37 , -R 38 -OR 39 Choose any one of the following, R 34 , R 35 , R 38 Each is independently selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group, R 36 , R 37 , R 39Each is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, or a C1-C6 haloalkyl group, and R 36 , R 37 , R 39 Any carbon atom of the C1-C6 alkyl group is selectively substituted with a heteroatom, where the heteroatom is an N atom, an S atom, or a P atom, and selectively R 36 and R 37 They combine to form a ring, [ka] In general formula (IV), W 1 is C, N, O or S, and W 2 is C or N, and W 1 and W 2 At least one of them is N, and R 41 , R 42 , R 43 , R 44 These are, independently, a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and -R 45 OH, -R 46 NR 47 R 48 , -R 49 -OR 50 Choose any one of the following, R 45 , R 46 , R 49 Each is independently selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group, R 47 , R 48 , R 50 Each is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, or a C1-C6 haloalkyl group. [ka] In general formula (V), A 1 , A 2 , A 3 , A 4 , A 5 , A 6 , A 7Each is independently either C or N, and R 51 , R 52 , R 53 , R 54 , R 55 , R 56 , R 57 These are hydrogen atoms, C1-C6 alkyl groups, C2-C6 alkenyl groups, C2-C6 alkynyl groups, -OH, -R 58 NR 59 R 60 , any one of the alkoxy groups, R 58 R is selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group. 59 , R 60 Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, or a C1-C6 haloalkyl group.

[0088] Each of the compounds in the above general formulas exhibits excellent dispersibility and stability in the electrolyte, as well as superior acid absorption. Therefore, it can reduce the long-term damage to the positive and negative electrode interfaces caused by acids in the electrolyte, further improving battery cycle performance.

[0089] In some embodiments, in general formula (III), R 31 , R 32 , R 33 These are, independently, a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C3-C5 alkenyl group, a C3-C5 alkynyl group, and -R 34 OH, -R 35 NR 36 R 37 , -R 38 -OR 39 Choose any one of the following, R 34 , R 35 , R 38 Each is independently selected from any one of the C0-C3 alkylene groups, R 36 , R 37 , R 39 Each is independently selected from any one of a hydrogen atom, a halogen atom, a C1-C3 alkyl group, or a C1-C3 haloalkyl group, and R 36 , R37 , R 39 Any carbon atom of a C1-C6 alkyl group is selectively substituted with a heteroatom, where the heteroatom is N and selectively R 36 and R 37 These combine to form a 5-membered aliphatic heterocycle or a 6-membered aliphatic heterocycle.

[0090] In some embodiments, R 31 , R 32 , R 33 These are, independently, a hydrogen atom, a halogen atom, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an allyl group, a propargyl group, -OH, -CH3OH, -NH2, -CH2NH2, -N(CH3)2, O-CH3, [ka] Selected from any one of the following, selectively, R 31 , R 32 , R 33 These are, independently, a hydrogen atom, a F atom, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, -CH3OH, -CH2NH2, -N(CH3)2, and O-CH3. [ka] It is selected from any one of the following.

[0091] The more nitrogen atoms a compound has in its structure represented by general formula (III), the higher its acid absorption. However, a higher number of nitrogen atoms also increases its activity, making it more susceptible to oxidation by oxides at the positive electrode, and thus affecting acid absorption. In some embodiments, compounds having the structure represented by general formula (III) are... [ka] [ka] One or more of the following compounds are selected. Each of the above compounds exhibits relatively ideal acid absorption and antioxidant properties, resulting in a more significant improvement in battery cycle performance.

[0092] In some embodiments, in general formula (IV), W 1 N is W 2 is either C or N.

[0093] In some embodiments, R 41 , R 42 , R 43 , R 44 These are, independently, a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C3-C5 alkenyl group, a C3-C5 alkynyl group, and -R 44 OH, -R 45 NR 46 R 47 , -R 48 -OR 49 Choose any one of the following, R 44 , R 45 , R 48 Each is independently selected from any one of the C0-C4 alkylene groups, R 46 , R 47 , R 49 Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, or a C1-C4 haloalkyl group.

[0094] In some embodiments, R 41 , R 42 , R 43 , R 44 Each of these is independently selected from any one of the following: hydrogen atom, F atom, methyl group, ethyl group, propyl group, cyclopropyl group, allyl group, propargyl group, -OH, -CH3OH, -NH2, -NHCH3, -CH2NH2, -N(CH3)2, and O-CH3.

[0095] In some embodiments, R 41 , R 42 , R 43 , R 44Each of these is independently selected from any one of the following: hydrogen atom, F atom, methyl group, propyl group, cyclopropyl group, allyl group, -CH3OH, -NH2, -NHCH3, and -N(CH3)2.

[0096] The more nitrogen atoms a compound has in its structure represented by general formula (IV), the higher its acid absorption. However, a higher number of nitrogen atoms also increases its activity, making it more susceptible to oxidation by oxides at the positive electrode, thus affecting acid absorption. In some embodiments, compounds having the structure represented by general formula (IV) are... [ka] One or more of the following compounds are selected. Each of the above compounds exhibits relatively ideal acid absorption and antioxidant properties, resulting in a more significant improvement in battery cycle performance.

[0097] In some embodiments, in general formula (V), A 1 N is A 2 , A 3 , A 4 , A 5 , A 6 , A 7 Each of these is independently either C or N.

[0098] In some embodiments, R 51 , R 52 , R 53 , R 54 , R 55 , R 56 , R 57 These are hydrogen atoms, C1-C4 alkyl groups, C2-C4 alkenyl groups, C2-C4 alkynyl groups, -OH, -R 58 NR 59 R 60 , any one of the alkoxy groups, R 58 R is selected from any one of the C0-C3 alkylene groups. 59 , R 60 Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C3 alkyl group, or a C1-C3 haloalkyl group.

[0099] In some embodiments, R 51 , R 52 , R 53 , R 54 , R 55 , R 56 , R 57 is any one of the following: a hydrogen atom, a methyl group, an ethyl group, an allyl group, a propargyl group, -OH, -NH2, -CH2NH2, -N(CH3)2, or O-CH3.

[0100] In some embodiments, R 51 , R 52 , R 53 , R 54 , R 55 , R 56 , R 57 is any one of the following: a hydrogen atom, a methyl group, an ethyl group, or O-CH3.

[0101] The more nitrogen atoms a compound has in its structure represented by general formula (V), the higher its acid absorption. However, a higher number of nitrogen atoms also increases its activity, making it more susceptible to oxidation by oxides at the positive electrode, thus affecting acid absorption. In some embodiments, compounds having the structure represented by general formula (V) are... [ka] [ka] One or more of the following compounds are selected. Each of the above compounds exhibits relatively ideal acid absorption and antioxidant properties, resulting in a more significant improvement in battery cycle performance.

[0102] In some embodiments, the 5- to 12-membered aliphatic heterocyclic organic base includes one or more compounds selected from the group consisting of compounds having the structure represented by general formula (VI) and compounds having the structure represented by general formula (VII), where, [ka] In general formula (VI), X 1 , X 2 , X 3 Each of them is independently C or N, and at least one of them is always N, a and b are each independently integers from 0 to 3, and each R 61 These are, independently, a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and -R 62 OH, -R 63 NR 64 R 65 , -R 66 -OR 67 Choose any one of the following, R 62 , R 63 , R 64 Each is independently selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group, R 65 , R 66 , R 67 Each is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, or a C1-C6 haloalkyl group. [ka] In general formula (VI), V 1 , V 2 , V 3 Each of them is independently either C or N, and at least one of them is always N, d is an integer from 0 to 3, and each R 71 These are, independently, a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and -R 72 OH, -R 73 NR 74 R 75 , -R 76 -OR 77 Choose any one of the following, R 72 , R 73 , R 74 Each is independently selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group, R 75 , R 76 , R 77Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, or a C1-C6 haloalkyl group.

[0103] In some embodiments, in general formula (VI), X 1 N is X 2 , X 3 Each of these is independently either C or n.

[0104] In some embodiments, a and b are independently 0, 1, or 2.

[0105] Several embodiments, each R 61 These are, independently, a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C3-C5 alkenyl group, a C3-C5 alkynyl group, and -R 62 OH, -R 63 NR 64 R 65 , -R 66 -OR 67 Choose any one of the following, R 62 , R 63 , R 64 Each is independently selected from any one of the C0-C3 alkylene groups, R 65 , R 66 , R 67 Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, or a C1-C4 haloalkyl group.

[0106] Several embodiments, each R 61 Each of these is independently selected from any one of the following: a hydrogen atom, a fluorine atom, a methyl group, an ethyl group, a hydroxyl group, -NH2, or -N(CH3)2.

[0107] The more nitrogen atoms a compound has in its structure represented by general formula (IV), the higher its acid absorption. However, a higher number of nitrogen atoms also increases its activity, making it more susceptible to oxidation by oxides at the positive electrode, thus affecting acid absorption. In some embodiments, compounds having the structure represented by general formula (VI) are... [ka] One or more of the following compounds are selected. Each of the above compounds exhibits relatively ideal acid absorption and antioxidant properties, resulting in a more significant improvement in battery cycle performance.

[0108] In some embodiments, in equation (VII), d is either 0 or 1.

[0109] In some embodiments, R 71 These are, independently, a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C3-C5 alkenyl group, a C3-C5 alkynyl group, and -R 72 OH, -R 73 NR 74 R 75 , -R 76 -OR 77 Choose any one of the following, R 72 , R 73 , R 74 Each is independently selected from any one of the C0-C3 alkylene groups, R 75 , R 76 , R 77 Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, or a C1-C4 haloalkyl group.

[0110] Several embodiments, each R 71 Each of these is independently selected from any one of the following: hydrogen atom, F atom, methyl group, ethyl group, n-propyl group, isopropyl group, hydroxyl group, -NH2, and -N(CH3)2.

[0111] Several embodiments, each R 71 Each of these is independently selected from any one of the following: a hydrogen atom, a fluorine atom, a methyl group, an ethyl group, an n-propyl group, or an isopropyl group.

[0112] The more nitrogen atoms a compound has in its structure represented by general formula (VII), the higher its acid absorption. However, a higher number of nitrogen atoms also increases its activity, making it more susceptible to oxidation by oxides at the positive electrode, thus affecting acid absorption. In some embodiments, compounds having the structure represented by general formula (VII) are... [ka] One or more of the following compounds are selected. Each of the above compounds exhibits relatively ideal acid absorption and antioxidant properties, resulting in a more significant improvement in battery cycle performance.

[0113] The amount of cyclic sulfate ester compound used in each of the above embodiments of this application can be compared to the amount of conventional cyclic sulfate ester compound used in conventional non-aqueous electrolytes. In some embodiments, the mass percentage of the first additive in the non-aqueous electrolyte is W1, and selectively, W1 is 0.001% to 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, W1 is 0.1% to 5%. By using cyclic sulfate ester compounds to form a sufficiently organic-inorganic mixed SEI film that is more stable and has stronger electron-blocking ability, it is possible not only to effectively improve the cycle performance of secondary batteries but also to improve the output power of secondary batteries. By limiting the above-mentioned mass content, it is possible to avoid the SEI film not functioning properly due to insufficient content of cyclic sulfate ester compounds, and to avoid the electrolyte viscosity becoming too high and the SEI film formed on the negative electrode becoming too thick, which reduces the conductivity of the electrolyte and weakens the improvement effect on cycle performance and charging capacity, due to excessive content of cyclic sulfate ester compounds.

[0114] The amount of organic base additive used in each of the embodiments of this application can be compared to the amount of conventional organic base additive used in conventional non-aqueous electrolytes. In some embodiments, the mass ratio of the second additive in the non-aqueous electrolyte is W2, and selectively, W2 is 0.001% to 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, W2 is 0.1% to 5%. By adjusting the amount of the second additive used within the above mass ratio range, the acid in the electrolyte can be flexibly adjusted.

[0115] In some embodiments, the ratio is 0.01 ≤ W1 / W2 ≤ 10, preferably 0.05 ≤ W1 / W2 ≤ 5. By adjusting the ratio of the two additives, the first additive is used to form a sufficient SEI film without affecting the conductivity of the electrolyte, and the second additive is used to further absorb the acid in the electrolyte, thereby fully utilizing the effects of both and further improving the battery's cycle performance and storage performance.

[0116] In some embodiments, the non-aqueous electrolyte further comprises an electrolyte, and any electrolyte that can be commonly used in non-aqueous electrolytes may be applied to 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 conventional electrolyte suitable for lithium-ion secondary batteries or sodium-ion secondary batteries. In some embodiments, the electrolyte selectively comprises an alkali metal salt electrolyte, and selectively comprises a lithium salt or a sodium salt, and selectively comprises one or more selected from the group consisting of lithium hexafluoride phosphate, lithium perchlorate, lithium hexafluoride arsenate, lithium bisfluorosulfonylimide and lithium bistrifluoromethanesulfonylimide, and one or more selected from the group consisting of sodium hexafluoride phosphate, sodium difluorooxalatoborate, sodium perchlorate, sodium bisfluorosulfonylimide, sodium bistrifluoromethanesulfonylimide and sodium trifluoromethanesulfonate.

[0117] The electrolyte content in the non-aqueous electrolyte can refer to the electrolyte content in conventional non-aqueous electrolytes, 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 between 0.5 mol / L and 1.5 mol / L, and even more selectively between 0.7 mol / L and 1.2 mol / L.

[0118] In some embodiments, the non-aqueous electrolyte further comprises a non-aqueous solvent, which selectively comprises one or more selected from the group consisting of cyclic carbonates, linear carbonates, 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. The above non-aqueous solvents may be used alone or in combination of two or more. For example, a mixed solvent of cyclic carbonate and linear carbonate may be used to improve the load characteristics and low-temperature characteristics of a secondary battery. When applying the non-aqueous electrolyte of this application to a solid battery, a solid solvent such as dimethyl sulfone may be used.

[0119] In addition to the additives described above, the additives may further include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve some of the battery's performance characteristics, such as additives that improve the battery's overcharge performance and additives that improve the battery's high-temperature or low-temperature performance. In some embodiments, the 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.

[0120] [Method for producing cyclic sulfate ester compounds having the structure represented by general formula (I)]

[0121] A method for producing a cyclic sulfate ester compound having the structure represented by general formula (I) of this application is provided with reference to the following synthesis route: [ka] Here, the reaction temperature in step 1 is controlled to 30-60°C, and the reaction temperature in step 2 is controlled to 10-30°C. Step 2 is catalyzed by a catalyst such as ruthenium trichloride trihydrate, and the oxidizing agent may be sodium hypochlorite, ozone, or the like.

[0122] [Positive electrode sheet]

[0123] A positive electrode sheet typically 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.

[0124] For example, a positive electrode current collector has two opposing surfaces in its own thickness direction, and the positive electrode film layer is installed on one or both of the two opposing surfaces of the positive electrode current collector.

[0125] In some embodiments, the positive electrode current collector can be a metal foil sheet or a composite current collector. For example, aluminum foil can be used as the metal foil sheet. The composite current collector may include a polymer material substrate 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 aluminum, aluminum 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)).

[0126] In some embodiments, the positive electrode active material can be any positive electrode active material for batteries known in the art. 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, this 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 0.2O2(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 0.05 The lithium-containing phosphate with an olivine structure may include, but is not limited to, at least one of O2 and its modified compounds. For example, the lithium-containing phosphate may include, but is not limited to, at least one of lithium iron phosphate (e.g., LiFePO4 (which may also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, or a composite material of lithium iron manganese phosphate and carbon.

[0127] In some embodiments, the positive electrode film layer optionally further comprises an adhesive. For example, the adhesive 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 resin.

[0128] In some embodiments, the cathode film layer further selectively comprises a conductive agent. For 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.

[0129] In some embodiments, a positive electrode sheet can be manufactured by the following method: Disperse the above components for manufacturing a positive electrode sheet, such as a positive electrode active material, a conductive agent, an adhesive, and any other components, in a solvent (e.g., N-methylpyrrolidone) to form a positive electrode slurry; apply the positive electrode slurry to a positive electrode current collector; and obtain a positive electrode sheet after going through processes such as drying and cold pressing.

[0130] [Negative electrode sheet]

[0131] The negative electrode sheet includes a negative electrode current collector and a negative electrode film layer installed on at least one surface of the negative electrode current collector, the negative electrode film layer containing a negative electrode active material.

[0132] For example, the negative electrode current collector has two opposing surfaces in its own thickness direction, and the negative electrode film layer is installed on one or both of the two opposing surfaces of the negative electrode current collector.

[0133] In some embodiments, the negative electrode current collector can be a metal foil sheet or a composite current collector. For example, copper foil can be used as the metal foil sheet. The composite current collector may include a polymer material substrate 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)).

[0134] 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 material such as artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material may be selected from at least one of elemental tin, tin oxide, and tin alloy. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may be used. These negative electrode active materials may be used individually or in combination of two or more.

[0135] 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%, there are fewer voids between particles in the negative electrode film layer, the particle structure is destroyed by extrusion, the difficulty of electrolyte penetration increases, the polarization of the battery cell increases, and the long-term cycle performance of the battery cell decreases. If the porosity of the negative electrode film layer on the negative electrode sheet is greater than 45%, the electrode sheet repels strongly, the actual usable compaction density of the electrode sheet decreases, and the energy density of the battery cell is affected.

[0136] The porosity of the negative electrode active material coating on the negative electrode sheet is tested using an AccuPyc II 1340 true density meter according to the instrument manual. The porosity of the negative electrode active material coating on the electrode sheet can be controlled by adjusting the particle size of the negative electrode active material and the pressure during the cold pressing process.

[0137] In some embodiments, the negative electrode active material layer comprises 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. V50 is 15 μm to 20 μm. Because the first and second additives form a SEIF film of a certain thickness on the surface of the negative electrode sheet, increasing the volume particle size of the negative electrode active material reduces the contact area between the negative electrode active material and the electrolyte, thereby reducing side reactions on the negative electrode surface and improving the cycle and storage performance of the battery cell.

[0138] In this application, the volume-average particle size 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) with reference to the GB / T 19077-2016 particle size distribution laser diffraction method.

[0139] In some embodiments, the negative electrode film layer further selectively comprises an adhesive. For example, the adhesive may 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).

[0140] In some embodiments, the negative electrode film layer further selectively comprises a conductive agent. For example, the conductive agent may be selected from at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0141] In some embodiments, the negative electrode film layer further selectively comprises other auxiliary agents, such as thickeners (e.g., sodium carboxymethylcellulose (CMC-Na)).

[0142] 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, an adhesive, and any other components, are dispersed in a solvent (e.g., deionized water) to form a negative electrode slurry; the negative electrode slurry is applied to a negative electrode current collector; and after processes such as drying and cold pressing, a negative electrode sheet is obtained.

[0143] [Separator]

[0144] In some embodiments, the secondary battery further includes a separator. This application is not particularly limited to the type of separator, and any known porous separator having good chemical and mechanical stability may be selected.

[0145] 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. If the separator is a multilayer composite film, the materials of each layer may be the same or different, and is not particularly limited.

[0146] 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.

[0147] In some embodiments, the secondary battery may include an outer casing. This casing may be used to package the electrode assembly and electrolyte.

[0148] In some embodiments, the casing of the secondary battery may be a rigid case, such as a rigid plastic case, an aluminum case, or a steel case. 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.

[0149] In this application, the shape of the secondary battery is not particularly limited and may be cylindrical, rectangular, or any other shape. For example, Figure 1 shows a secondary battery 5 with a rectangular structure as an example.

[0150] In some embodiments, referring to Figure 2, the casing may include a case 51 and a cover plate 53. Here, the case 51 may include a bottom plate and side plates connected to the bottom plate, the bottom plate and side plates surrounding and forming a housing cavity. The case 51 has an opening that communicates with the housing cavity, and the cover plate 53 can cover the opening and seal the housing cavity. The positive electrode sheet, negative electrode sheet and separator can form an electrode assembly 52 through a winding process or a lamination process. The electrode assembly 52 is packaged within the housing cavity. The electrolyte permeates 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 select according to their actual specific needs.

[0151] In some embodiments, the secondary batteries may be assembled into a battery module, and the number of secondary batteries included in the battery module may be one or more, and the specific number can be selected by those skilled in the art depending on the application and capacity of the battery module.

[0152] Figure 3 shows an example of a battery module 4. Referring to Figure 3, in the battery module 4, multiple secondary batteries 5 may be installed in a sequential arrangement along the longitudinal direction of the battery module 4. Of course, they may be arranged in any other manner. Furthermore, these multiple secondary batteries 5 can be fixed in place by fasteners.

[0153] Selectively, the battery module 4 may further include a housing having a housing space, in which a plurality of secondary batteries 5 are housed.

[0154] In some embodiments, the battery modules may be further assembled into a battery pack, and the number of battery modules included in the battery pack may be one or more, and the specific number can be selected by those skilled in the art depending on the application and capacity of the battery pack.

[0155] 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 able to be covered by a lid on the lower housing 3 and forming a sealed space for housing the battery modules 4. The plurality of battery modules 4 may be arranged inside the battery box in any way.

[0156] The present application further provides a power consumption device comprising at least one of a secondary battery, battery module, or battery pack as described herein. 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, laptops, 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.

[0157] The aforementioned power consumption device can be selected from a secondary battery, battery module, or battery pack depending on the usage demand.

[0158] 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 needs of the secondary battery of this power consumption device, a battery pack or battery module can be used.

[0159] [Examples]

[0160] Examples of the present application are described below. The examples described below are illustrative and are for interpretive purposes only, and should not be understood as limiting the present application. Where no specific technical or condition is specified in the examples, the technical or condition is as described in the literature in the art, or in accordance with product specifications. Where the manufacturer is not specified for the reagents or instruments used, they are all commercially available common products, and information on the remaining reagents or compounds is recorded in Table 1.

[0161] [Table 1-1] [Table 1-2]

[0162] Synthesis Example 1: Synthesis of Compound 1 [ka]

[0163] Step 1: Add 300 g (2 mol) of solid 1,6-dideoxygalactitol 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 flask warm at 45°C for 4 hours to allow the reaction to proceed. A large amount of slurry-like solid precipitates from 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 several 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.

[0164] Step 2: Add 184.2 g (0.8 mol) of the intermediate product 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 at 10-20°C for 10 minutes, perform liquid-liquid extraction, quench the organic phase with sodium sulfite aqueous solution, continue until the potassium starch iodide test paper no longer turns blue, repeat the liquid-liquid extraction, concentrate the organic layer, and crystallize it with acetonitrile to obtain a white powder solid, i.e., 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).

[0165] Synthesis example 2: Compound 2 [ka] synthesis

[0166] Step 1: Add 356.5 g (2 mol) of solid 3,4,5,6-octanetetraol 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 flask warm at 45°C for 4 hours to allow the reaction to proceed. A large amount of slurry-like solid precipitates from 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 several 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.

[0167] Step 2: Add 216.2 g (0.8 mol) of the intermediate product 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, add 2000 g of 20% sodium hypochlorite aqueous solution dropwise within 1 hour, control the reaction temperature to 10-20°C, after the dropwise addition is complete, stir at 10-20°C for 10 minutes, perform liquid-liquid extraction, quench the organic phase with sodium sulfite aqueous solution, continue until the potassium starch iodide test paper no longer turns blue, repeat the liquid-liquid extraction, concentrate the organic layer, and crystallize it with acetonitrile to obtain compound 2.

[0168] Synthesis example 3: Compound 3 [ka] synthesis

[0169] Step 1: Add 328.4 g (2 mol) of solid 2,3,4,5-heptanetetraol 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 flask warm at 45°C for 4 hours to allow the reaction to proceed. A large amount of slurry-like solid precipitates from 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 several 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.

[0170] Step 2: Add 205 g (0.8 mol) of the intermediate product to a 23-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, 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 at 10-20°C for 10 minutes, perform liquid-liquid extraction, quench the organic phase with sodium sulfite aqueous solution, continue until the potassium starch iodide test paper no longer turns blue, repeat the liquid-liquid extraction, concentrate the organic layer, and crystallize it with acetonitrile to obtain compound 3 (163.1 g, yield 82.8%).

[0171] Synthesis example 4: Compound 4 [ka] synthesis

[0172] Step 1: Add 392.4 g (2 mol) of solid 1,2,3,4,5,6-heptanehexaol to a 2 L three-necked flask and start stirring. Add 784.5 g (6.6 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 flask warm at 45°C for 4 hours to allow the reaction to proceed. A large amount of slurry-like solid precipitates from the reaction solution. After cooling, slowly add 1 L of deionized water dropwise, quickly stir the reaction system to disperse, filter to obtain the solid, wash by beating several 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.

[0173] Step 2: Add 140 g (0.4 mol) of the intermediate product to a 4 L three-necked flask, add 1000 mL of acetonitrile, add 110 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 1500 g of 20% sodium hypochlorite aqueous solution dropwise to control the reaction temperature to 10-20°C. After the dropwise addition is complete, stir at 10-20°C for 10 minutes, perform liquid-liquid extraction, quench the organic phase with sodium sulfite aqueous solution, continue until the potassium starch iodide test paper no longer turns blue, repeat the liquid-liquid extraction, concentrate the organic layer, and crystallize it with acetonitrile to obtain compound 4.

[0174] Synthesis example 5: Compound 5 [ka] synthesis

[0175] Step 1: Add 484 g (2 mol) of solid octitol to a 2 L three-necked flask and start stirring. Add 1046 g (8.8 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 flask warm at 45°C for 4 hours to allow the reaction to proceed. A large amount of slurry-like solid will precipitate from 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 several 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.

[0176] 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, add 2000 g of 20% sodium hypochlorite aqueous solution dropwise within 1 hour, control the reaction temperature to 10-20°C, after the dropwise addition is complete, stir at 10-20°C for 10 minutes, perform liquid-liquid extraction, quench the organic phase with sodium sulfite aqueous solution, continue until the potassium starch iodide test paper no longer turns blue, repeat the liquid-liquid extraction, concentrate the organic layer, and crystallize it with acetonitrile to obtain compound 5.

[0177] For the synthesis method of the compound, refer to Synthesis Example 1, and use the corresponding substrate in Table 2 instead of 1,6-dideoxygalactitol.

[0178] [Table 2]

[0179] Example 1

[0180] Manufacturing of rechargeable batteries

[0181] Electrolyte composition: Compound 1 was used as the first additive, with a mass content of 2% in the electrolyte; compounds 3-6 were used as second additives, with a mass content of 2% in the electrolyte; lithium hexafluoride phosphate (LiPF6) was used as the electrolyte, with a content of 10% in the electrolyte; and a mixture of EC+EMC (ethylene carbonate + ethyl methyl carbonate) in a volume ratio of 3:7 was used as the solvent.

[0182] Manufacturing of positive electrode sheets:

[0183] Lithium iron phosphate (LiFePO4) as the positive electrode active material, acetylene black as the conductive agent, and polyvinylidene fluoride (PVDF) as the adhesive were dissolved in the solvent N-methylpyrrolidone (NMP) in a mass ratio of 90:5:5. After thorough stirring and homogeneous mixing, a positive electrode slurry was obtained. Subsequently, the positive electrode slurry was uniformly applied to a positive electrode current collector, and after drying, cold pressing, and slitting, a positive electrode sheet was obtained.

[0184] Manufacturing of negative electrode sheets:

[0185] A negative electrode slurry was prepared by dissolving graphite as the negative electrode active material, carbon black as the conductive agent, styrene-butadiene rubber (SBR) as the adhesive, and sodium carboxymethylcellulose (CMC-Na) as the thickener in a mass ratio of 90:4:4:2 in deionized water as the solvent and mixing them uniformly. The negative electrode slurry was then uniformly applied to the copper foil of the negative electrode current collector in one or more applications, followed by drying, cold pressing, and slitting to obtain a negative electrode sheet having a negative electrode film layer. The porosity of the negative electrode film layer was 40%, and the DV50 of the graphite used was 18 μm.

[0186] Separator:

[0187] A conventional polypropylene film was used as the separator.

[0188] Lithium-ion battery assembly:

[0189] A positive electrode sheet, a separator, and a negative electrode sheet are stacked in order, with the separator placed between the positive and negative electrode sheets to act as an isolation element. The assembly is then wound up to obtain an electrode assembly, which is placed in a battery case. After drying, an electrolyte solution is injected, and after processes such as chemical formation and standing, a lithium-ion battery is obtained.

[0190] The substance or amount of the first additive and the substance or amount of the second additive in the electrolytes of Examples 1 to 53 and Comparative Examples 1 to 9 are all recorded in Table 3, and all other details are the same as in Example 1.

[0191] [Table 3-1] [Table 3-2]

[0192] The porosity of the negative electrode film layers and the Dv50 of the negative electrode material used in Examples 54-63 are recorded in Table 4, and all other details are the same as in Example 1.

[0193] [Table 4]

[0194] Performance testing:

[0195] 1. Cycle performance test

[0196] At 25°C, a lithium-ion battery was charged to 3.65V with a constant current of 0.5C, then charged again with a constant voltage of 3.65V until the current dropped to less than 0.05C, and finally discharged to 2.5V with a constant current of 0.5C. This constitutes one charge-discharge cycle. The number of cycles was calculated after repeating this charging and discharging process until the lithium-ion battery was at 80% capacity.

[0197] 2. Storage performance test

[0198] At 25°C, each manufactured lithium-ion secondary battery was first charged to 3.65V with a constant current of 0.33C, then charged again at a constant voltage of 3.65V until the current was 0.05C, and then discharged to 2.5V with a constant current of 0.33C. The discharge capacity C0 is the discharge capacity of the lithium-ion secondary battery before high-temperature storage. The lithium-ion secondary battery was then fully charged by charging it to 3.65V with a constant current of 0.33C and then at a constant voltage of 3.65V until the current was 0.05C. After placing the battery in a 60°C oven for 30 days, the battery was removed, placed in a 25°C environment, discharged at 0.33C, and the discharge capacity was recorded as C1. The capacity retention rate is (C1 / C0) × 100%.

[0199] 3. Volume expansion coefficient test

[0200] At 25°C, each manufactured lithium-ion secondary battery was first charged to 3.65V with a constant current of 0.33C, then charged again with a constant voltage of 3.65V until the current was 0.05C, and finally discharged to 2.5V with a constant current of 0.33C. This discharge capacity was the discharge capacity of the lithium-ion secondary battery before high-temperature storage. The lithium-ion secondary battery was then fully charged by charging it to 3.65V with a constant current of 0.33C and then charging it again with a constant voltage of 3.65V until the current was 0.05C. The volume of the battery was tested using the water displacement method. Subsequently, the lithium-ion battery was stored at 60°C for 60 days. After storage, the lithium-ion secondary battery was placed in a 25°C environment and its volume was tested using the water displacement method. The volume expansion rate of the battery = (volume after storage / volume before storage - 1)%.

[0201] The test results are recorded in Table 5.

[0202] [Table 5-1] [Table 5-2] [Table 5-3]

[0203] A comparison of the data in Table 5 revealed that using different first additives in combination with the same second additive improved both the battery's cycle performance and storage performance, but the degree of improvement differed. Furthermore, a comparison of the data from Example 1 and Examples 42-53 showed that the amount and ratio of the first and second additives used both affected the improvement in the battery's cycle performance and storage performance, and that the battery's cycle performance, storage performance, and volume expansion rate were clearly improved, especially when W1 / W2 was between 0.01 and 1. A comparison of the data from Examples 54-63 revealed that both the porosity of the negative electrode film layer and the DV50 of the negative electrode active material affected the improvement in the battery's cycle performance, storage performance, and volume expansion rate.

[0204] While this application has been described with reference to preferred embodiments, various improvements can be made thereto without departing from the scope of this application, and components therein can be replaced with equivalents. In particular, each technical feature mentioned in each embodiment can be combined in any manner, provided that there is no structural inconsistency. This application is not limited to the specific embodiments disclosed herein, but includes all technical ideas contained in the claims.

Claims

1. A non-aqueous electrolyte containing an additive, wherein the additive comprises a first additive and a second additive, and the first additive is any one or more cyclic sulfate ester compounds having a structure represented by general formula (I). 【Chemistry 52】 Here, R １ , R ２ , R ３ and R ４ Each of these is independently selected from any one of the following: a group having the structure represented by 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 each independently any integer from 0 to 2. General formula (II) is, 【Chemistry 53】 And, R ５ and R ６ Each of these is independently selected from any one of the following: a group having the structure represented by 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 is an organic base additive, the organic base additive comprises any one or more from the group consisting of 5-12 member aromatic heterocyclic organic bases or 5-12 member aliphatic heterocyclic organic bases, and the ring structures of the 5-12 member aromatic heterocyclic organic base and the 5-12 member aliphatic heterocyclic organic base contain nitrogen atoms, the non-aqueous electrolyte.

2. R １ and R ２ are not hydrogen atoms at the same time, and R ３ and R ４ are not hydrogen atoms at the same time Or, R １ , R ２ , R ３ , R ４ , R ５ and R ６ The following conditions must be met: R １ and R ２ It is also a hydrogen atom, R ３ and R ４ R is any one of the following: one is a hydrogen atom and the other is a group having the structure represented by 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 is in the group having the structure represented by general formula (II). ５ and R ６ At the same time, it is not a hydrogen atom, Or, R １ , R ２ , R ３ , R ４ , R ５ and R ６ The following conditions must be met: R ３ and R ４ It is also a hydrogen atom, R １ and R ２ R is any one of the following: one is a hydrogen atom and the other is a group having the structure represented by 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 is in the group having the structure represented by general formula (II). ５ and R ６ The non-aqueous electrolyte according to claim 1, wherein the atom is not a hydrogen atom.

3. The cyclic sulfate ester compound has the structure shown in formula (I-1), 【Chemistry 54】 R １ , R ２ , R ３ and R ４ Each of these is independently selected from any one of the following: a group having the structure represented by 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 55】 And, R ５ and R ６ The non-aqueous electrolyte according to claim 1 or 2, wherein each is independently selected from any one of the following: a group having a structure represented by 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 any one of the following: a group having the structure represented by 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 any one of the following: a group having the structure represented by general formula (II-1), a hydrogen atom, a halogen atom, a C1-C3 alkyl group, and 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 any one of the following: a group having the structure represented by 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 represented by the general formula (II-1) is, 【Transformation 56】 It is selected from any one of the following groups, 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 【Chemistry 57】 X is selected from any 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. Furthermore, selectively, R １ , R ２ , R ３ and R ４ Each is independent 【Transformation 58】 A non-aqueous electrolyte according to any one of claims 1 to 3, wherein X is an atom of F, selected from any one of a hydrogen atom, a methyl group, and an ethyl group.

5. The aforementioned cyclic sulfate ester compound is 【Chemistry 59】 A non-aqueous electrolyte according to claim 1, selected from any one or more of the compounds.

6. The aforementioned 5- to 12-membered aromatic heterocyclic organic base includes one or more compounds selected from the group consisting of compounds having the structure represented by general formula (III), compounds having the structure represented by general formula (IV), and compounds having the structure represented by general formula (V), where, 【Transformation 60】 In general formula (III), Y １ , Y ２ These are C and N elements, respectively, and R ３１ , R ３２ , R ３３ Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and -R. ３４ OH, -R ３５ NR ３６ R ３７ , -R ３８ -O-R ３９ Any one of the following is selected, R ３４ , R ３５ , R ３８ Each is independently selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group, R ３６ , R ３７ , R ３９ Each is independently selected from any one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, and a C1-C6 haloalkyl group, and the R ３６ , R ３７ , R ３９ In the C1-C6 alkyl group, any carbon atom is selectively substituted with a heteroatom, the heteroatom being an N atom, an S atom, or a P atom, and selectively, the R ３６ and R ３７ They combine to form a ring, 【Chemistry 61】 In general formula (IV), W １ is C, N, O or S, and W ２ is C or N, and at least one of W １ and W ２ is N, and R ４１ , R ４２ , R ４３ , R ４４ are each independently selected from any one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, -R ４５ OH, -R ４６ NR ４７ R ４８ , -R ４９ -O-R ５０ ; R ４５ , R ４６ , R ４９ are each independently selected from any one of a C0-C6 alkylene group and a C2-C6 alkenylene group; R ４７ , R ４８ , R ５０ are each independently selected from any one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, and a C1-C6 haloalkyl group. 【Transformation 62】 In general formula (V), A １ A ２ A ３ A ４ A ５ A ６ A ７ Each is independently C or N, and R ５１ , R ５２ , R ５３ , R ５４ , R ５５ , R ５６ , R ５７ These are hydrogen atoms, C1-C6 alkyl groups, C2-C6 alkenyl groups, C2-C6 alkynyl groups, -OH, -R ５８ NR ５９ R ６０ , any one of the alkoxy groups, R ５８ R is selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group. ５９ , R ６０ The non-aqueous electrolyte according to any one of claims 1 to 5, wherein each is independently selected from any one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, and a C1-C6 haloalkyl group.

7. In general formula (III), the R ３１ , R ３２ , R ３３ Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C3-C5 alkenyl group, a C3-C5 alkynyl group, and -R. ３４ OH, -R ３５ NR ３６ R ３７ , -R ３８ -O-R ３９ Any one of the following is selected, R ３４ , R ３５ , R ３８ Each is independently selected from any one of the C0 to C3 alkylene groups, R ３６ , R ３７ , R ３９ Each is independently selected from any one of a hydrogen atom, a halogen atom, a C1-C3 alkyl group, and a C1-C3 haloalkyl group, and the R ３６ , R ３７ , R ３９ Any carbon atom of the C1-C6 alkyl group is selectively substituted with a heteroatom, the heteroatom being an N atom, and selectively the R ３６ and R ３７ These combine to form a five-membered aliphatic heterocycle or a six-membered aliphatic heterocycle. Selectively, the R ３１ , R ３２ , R ３３ These are, independently, a hydrogen atom, a halogen atom, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an allyl group, a propargyl group, -OH, and -CH. ３ OH, -NH ２ ien-CH ２ NH ２ , -N(CH ３ ) ２ O-CH ３ , 【Transformation 63】 Selected from any one of the above, selectively, R ３１ , R ３２ , R ３３ These are, independently, a hydrogen atom, a F atom, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, and -CH ３ OH, -CH ２ NH ２ , -N(CH ３ ) ２ O-CH ３ , 【Chemistry 64】 Select any one of the following, Selectively, the compound having the structure represented by general formula (III) is 【Transformation 65】 【Chemical Formula 66】 The non-aqueous electrolyte according to claim 6, which is selected from any one or more of the compounds.

8. In general formula (IV), the W １ is N, and the aforementioned W ２ is C or N, Selectively, the R ４１ , R ４２ , R ４３ , R ４４ Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C3-C5 alkenyl group, a C3-C5 alkynyl group, and -R. ４４ OH, -R ４５ NR ４６ R ４７ , -R ４８ -O-R ４９ Any one of the following is selected, R ４４ , R ４５ , R ４８ Each is independently selected from any one of the C0 to C4 alkylene groups, R ４６ , R ４７ , R ４９ Each is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, or a C1-C4 haloalkyl group. Selectively, the R ４１ , R ４２ , R ４３ , R ４４ These are, independently, a hydrogen atom, a F atom, a methyl group, an ethyl group, a propyl group, a cyclopropyl group, an allyl group, a propargyl group, -OH, and -CH. ３ OH, -NH ２ , - NHCH ３ ien-CH ２ NH ２ , -N(CH ３ ) ２ O-CH ３ Select any one of the following, Selectively, the R ４１ , R ４２ , R ４３ , R ４４ These are, independently, a hydrogen atom, an F atom, a methyl group, a propyl group, a cyclopropyl group, an allyl group, and -CH ３ OH, -NH ２ , - NHCH ３ , -N(CH ３ ) ２ Select any one of the following, Selectively, the compound having the structure represented by general formula (IV) is 【Transformation 67】 The non-aqueous electrolyte according to claim 6, which is selected from any one or more of the compounds.

9. In general formula (V), A １ N is A ２ A ３ A ４ A ５ A ６ A ７ Each is independently either C or N, Selectively, R ５１ , R ５２ , R ５３ , R ５４ , R ５５ , R ５６ , R ５７ These are hydrogen atoms, C1-C4 alkyl groups, C2-C4 alkenyl groups, C2-C4 alkynyl groups, -OH, -R ５８ NR ５９ R ６０ and any one of the alkoxy groups, R ５８ R is selected from any one of the C0 to C3 alkylene groups. ５９ , R ６０ Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C3 alkyl group, or a C1-C3 haloalkyl group. Selectively, R ５１ , R ５２ , R ５３ , R ５４ , R ５５ , R ５６ , R ５７ These are hydrogen atoms, methyl groups, ethyl groups, allyl groups, propargyl groups, -OH, -NH ２ ien-CH ２ NH ２ , -N(CH ３ ) ２ O-CH ３ Any one of the following, Selectively, R ５１ , R ５２ , R ５３ , R ５４ , R ５５ , R ５６ , R ５７ These are a hydrogen atom, a methyl group, an ethyl group, and O-CH ３ Any one of the following, Selectively, the compound having the structure represented by general formula (V) is 【Transformation 68】 The non-aqueous electrolyte according to claim 6, which is selected from any one or more of the compounds.

10. The aforementioned 5- to 12-membered aliphatic heterocyclic organic base includes one or more compounds selected from the group consisting of compounds having the structure represented by general formula (VI) and compounds having the structure represented by general formula (VII), where, 【Transformation 69】 In general formula (VI), X １ , X ２ , X ３ Each is independently C or N, and at least one of them is always N, a and b are independently integers from 0 to 3, and each R ６１ Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and -R. ６２ OH, -R ６３ NR ６４ R ６５ , -R ６６ -O-R ６７ Any one of the following is selected, R ６２ , R ６３ , R ６４ Each is independently selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group, R ６５ , R ６６ , R ６７ Each of these is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C6 alkyl group, or a C1-C6 haloalkyl group. 【Transformation 70】 In general formula (VI), V １ , V ２ , V ３ Each of them is independently either C or N, and at least one of them is always N, d is an integer from 0 to 3, and each R ７１ Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, and -R. ７２ OH, -R ７３ NR ７４ R ７５ , -R ７６ -O-R ７７ Any one of the following is selected, R ７２ , R ７３ , R ７４ Each is independently selected from any one of the C0-C6 alkylene group and the C2-C6 alkenylene group, R ７５ , R ７６ , R ７７ The non-aqueous electrolyte according to any one of claims 1 to 9, wherein each is independently selected from any one of a hydrogen atom, a halogen atom, a C1-C6 alkyl group, and a C1-C6 haloalkyl group.

11. In the above general formula (VI), X １ N is X ２ , X ３ Each is independently either C or N, Selectively, a and b are independently 0, 1, or 2. Selectively, each R ６１ Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C3-C5 alkenyl group, a C3-C5 alkynyl group, and -R. ６２ OH, -R ６３ NR ６４ R ６５ , -R ６６ -O-R ６７ Any one of the following is selected, R ６２ , R ６３ , R ６４ Each is independently selected from any one of the C0 to C3 alkylene groups, R ６５ , R ６６ , R ６７ Each is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, or a C1-C4 haloalkyl group. Selectively, each R ６１ These are, independently, a hydrogen atom, an F atom, a methyl group, an ethyl group, a hydroxyl group, and -NH. ２ , -N(CH ３ ) ２ Select any one of the following, Selectively, the compound having the structure represented by general formula (VI) is 【Chemistry 71】 The non-aqueous electrolyte according to claim 10, which is selected from any one or more of the compounds.

12. In the above general formula (VII), d is 0 or 1, Selectively, each R ７１ Each of these independently consists of a hydrogen atom, a halogen atom, a C1-C4 alkyl group, a C3-C5 alkenyl group, a C3-C5 alkynyl group, and -R. ７２ OH, -R ７３ NR ７４ R ７５ , -R ７６ -O-R ７７ Any one of the following is selected, R ７２ , R ７３ , R ７４ Each is independently selected from any one of the C0 to C3 alkylene groups, R ７５ , R ７６ , R ７７ Each is independently selected from any one of the following: a hydrogen atom, a halogen atom, a C1-C4 alkyl group, or a C1-C4 haloalkyl group. Selectively, each R ７１ These are, independently, a hydrogen atom, an F atom, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, a hydroxyl group, and -NH ２ , -N(CH ３ ) ２ Select any one of the following, Selectively, each R ７１ Each of these is independently selected from any one of the following: hydrogen atom, F atom, methyl group, ethyl group, n-propyl group, and isopropyl group. Selectively, the compounds having the structure represented by general formula (VII) 【Chemistry 72】 The non-aqueous electrolyte according to claim 10, which is selected from any one or more of the compounds.

13. The mass ratio of the first additive in the non-aqueous electrolyte is W1, and selectively, W1 is 0.001% to 20%, and more selectively, W1 is 0.1% to 5%. and / or the mass percentage of the second additive in the non-aqueous electrolyte is W2, selectively W2 is 0.001% to 20%, and more selectively W2 is 0.1% to 5%. A non-aqueous electrolyte according to any one of claims 1 to 12, wherein selectively, 0.01 ≤ W1 / W2 ≤ 10, preferably 0.05 ≤ W1 / W2 ≤ 5.

14. The non-aqueous electrolyte according to any one of claims 1 to 13, wherein the non-aqueous electrolyte further comprises an electrolyte, which optionally comprises an alkali metal salt electrolyte, which optionally comprises a lithium salt or a sodium salt, which optionally comprises one or more selected from the group consisting of lithium hexafluoride phosphate, lithium perchlorate, lithium hexafluoride arsenate, lithium bisfluorosulfonylimide and lithium bistrifluoromethanesulfonylimide, and the sodium salt comprises one or more selected from the group consisting of sodium hexafluoride phosphate, sodium difluorooxalatoborate, sodium perchlorate, sodium bisfluorosulfonylimide, sodium bistrifluoromethanesulfonylimide and sodium trifluoromethanesulfonate.

15. The non-aqueous electrolyte further comprises a non-aqueous solvent, which selectively comprises one or more selected from the group consisting of cyclic carbonates, linear carbonates, nitrile solvents, ketone solvents and sulfone solvents, and further selectively comprises ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene A non-aqueous electrolyte according to any one of claims 1 to 14, comprising one or more selected from the group consisting of ethylene 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, methyl ethyl sulfone, diethyl sulfone, tetrahydrofuran, ethylene glycol dimethyl ether, dioxolane, acetone, acetonitrile, and butyronitrile.

16. The non-aqueous electrolyte according to any one of claims 1 to 15, 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.

17. 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 according to any one of claims 1 to 16, and the secondary battery is selectively a lithium-ion secondary battery or a sodium-ion secondary battery.

18. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer installed on one or both sides of the negative electrode current collector, wherein the porosity of the negative electrode active material layer is 30% to 45%, selectively 37% to 42%. The negative electrode active material layer comprises a negative electrode active material, and selectively comprises 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 17, wherein 50 is 15 μm to 20 μm.

19. A power consumption device including a secondary battery, wherein the secondary battery includes the secondary battery described in any one of claims 17 to 18.

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