Electrode plate and its manufacturing method, battery, and power consumption device

Abstract

The present application relates to an electrode plate and a manufacturing method thereof, a battery, and a power consumption device, the electrode plate including a current collector and an electrode film layer provided on the surface of the current collector, a component of the electrode film layer including a silicon compound, the silicon compound having a group represented by formula (A), wherein each R1 is independently selected from any one of hydrogen, a substituted or unsubstituted alkyl group, an alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and wherein no R1 is simultaneously hydrogen, and an * represents a bonding site between the group represented by formula (A) and another structure in the silicon compound.

Description

[Technical Field]

[0001] This application is incorporated by reference into Chinese Patent Application No. 202310741188.4, filed on June 21, 2023, entitled "Electrode plate and manufacturing method thereof, battery, and power consumption device," the entire contents of which are incorporated by reference into this application.

[0002] The present application relates to the field of battery technology, and in particular to an electrode plate and its manufacturing method, a battery, and a power consuming device. [Background technology]

[0003] Secondary batteries such as lithium batteries are increasingly being used widely due to their clean and renewable characteristics. As the supply of lithium resources becomes increasingly tight, batteries with more abundant raw material reserves and lower costs, such as sodium batteries and potassium batteries, are attracting people's attention.

[0004] However, with the rapid development of the new energy industry, people's demand for new energy transportation such as electric vehicles and electric bicycles is becoming increasingly higher, and the requirements for their performance are also becoming higher. Batteries are an important power source for electric vehicles, so people's requirements for the performance of batteries are also becoming higher. Conventional batteries are finding it increasingly difficult to meet people's needs, and further improvements are needed. Summary of the Invention [Problem to be solved by the invention]

[0005] According to various embodiments of the present application, the present application provides an electrode plate and a manufacturing method thereof, a battery, and a power consuming device, which are intended to improve the coulombic efficiency and cycle performance of a battery. [Means for solving the problem]

[0006] The present application is realized by the following technical solutions:

[0007] A first aspect of the present application provides an electrode plate, the electrode plate including a current collector and an electrode film layer provided on a surface of the current collector, the electrode film layer including a silicon compound as a component, the silicon compound having a group represented by formula (A): [ka] In formula (A), each R1 is independently selected from any one of hydrogen, a substituted or unsubstituted alkyl group, an alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and each R1 is not simultaneously hydrogen; The symbol "*" indicates the bonding site between the group represented by formula (A) and another structure in the silicon compound.

[0008] In the above-mentioned electrode plate, the silicon compound in the electrode film layer contains a group represented by a specific formula (A). On the one hand, the silicon compound can capture moisture in the electrode film layer, and can also capture moisture in the electrolyte during battery production, thereby reducing the moisture in the battery system and reducing side reactions caused by moisture in the battery system; on the other hand, during battery production, the silicon compound in the electrode plate can also react with the corrosive by-product HF generated in the electrolyte, thereby capturing corrosive by-products such as HF. This acts in two major ways to improve the stability of the battery, and improve the coulomb efficiency and cycle performance of the battery.

[0009] In some embodiments thereof, each R1 is independently selected from any one of hydrogen, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms; Alternatively, each R1 is independently selected from any one of hydrogen, an unsubstituted alkyl group having 1 to 15 carbon atoms, an alkyl group substituted with a halogen and having 1 to 15 carbon atoms, an unsubstituted cycloalkyl group having 3 to 15 carbon atoms, a cycloalkyl group substituted with a halogen and having 3 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, a substituted or unsubstituted aryl group having 6 to 20 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 20 ring atoms, an alkenyl group having 2 to 15 carbon atoms, and an alkynyl group having 2 to 15 carbon atoms.

[0010] In some embodiments thereof, the silicon compound further comprises a D group, wherein the D group is selected from at least one of a borate ester group, a phosphate ester group, a phosphinate ester group, a sulfonate ester group, and an amine group; Optionally, the group D is selected from at least one group of a borate ester group, a phosphate ester group, and a phosphinate ester group, and the group D and the group represented by formula (A) are bonded via an oxygen atom. Research findings: When silicon compounds further contain a borate ester structure, they can further participate in the formation of an SEI (or CEI) film when used in battery manufacturing, further improving the film structure and toughness, thereby further improving the cycle performance of the battery.

[0011] Further research has revealed that if the silicon compound in the electrode plate further contains a phosphate ester or hypophosphite ester structure, the amount of transition metal elution in the active material of the electrode plate can be reduced during cycle use, improving the composition stability of the electrode plate and further improving the efficiency and cycle performance of the battery.

[0012] Research has shown that the above phenomenon may occur due to the following reasons: the phosphate or phosphinate groups on the surface of the electrode plate can react with oxidizing substances generated during the charge and discharge process of the battery, reducing parasitic oxidation currents, inhibiting the decomposition of the oxidizing substances on the electrode material, and improving the composition stability of the electrode plate during the charge and discharge process.In conventional technology, when the above silicon compound is added to the electrolyte, the probability of contact between it and the oxidizing substances generated during the charge and discharge process is extremely low, so it is basically unable to effectively inhibit metal elution and can only simply perform the function of removing water.

[0013] Alternatively, the group D is an amine group, and the group D and the group represented by formula (A) are bonded via a nitrogen atom.

[0014] In some embodiments thereof, the silicon compound comprises at least one of formulas (1)-(5): [ka] In formulas (1) to (5), G is selected from boron or phosphorus, each L1 is independently selected from any one of a halogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT1, and at least one L1 is -OT1, T1 is selected from any one of hydrogen, a group represented by formula (A), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and at least one T1 is a group represented by formula (A), each L2 is independently selected from any one of a halogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT2, and at least one L2 is -OT2, T2 is selected from any one of hydrogen, a group represented by formula (A), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and at least one T2 is a group represented by formula (A), Y is selected from a single bond or oxygen; each L3 is independently selected from any one of a halogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT3; at least one L3 is -OT3; T3 is selected from any one of hydrogen, a group represented by formula (A), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group; and at least one T3 is a group represented by formula (A); each L4 is independently selected from any one of hydrogen, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, and a group represented by formula (A), and at least one L4 is a group represented by formula (A), Each L5 is independently selected from any one of a halogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT5, and at least one L5 is -OT4, T4 is selected from any one of hydrogen, a group represented by formula (A), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and at least one T4 is a group represented by formula (A).

[0015] In some embodiments thereof, the silicon compound satisfies any one of the following conditions (1) to (5): (1) at least two L1 are selected from -OT1; Alternatively, T1 is selected from any one of hydrogen, a group represented by formula (A), an unsubstituted alkyl group having 1 to 30 carbon atoms, an alkyl group substituted with a halogen and having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms; More preferably, at least two T1 are selected from groups represented by formula (A): (2) at least two L2 are selected from -OT2; Alternatively, T2 is selected from any one of hydrogen, a group represented by formula (A), an unsubstituted alkyl group having 1 to 30 carbon atoms, an alkyl group substituted with a halogen and having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms; More preferably, at least two T2 are selected from groups represented by formula (A): (3) at least two L3 are selected from -OT3; Alternatively, T3 is selected from any one of hydrogen, a group represented by formula (A), an unsubstituted alkyl group having 1 to 30 carbon atoms, an alkyl group substituted with a halogen and having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms; More preferably, at least two T3 are selected from groups represented by formula (A): (4) each L4 is independently selected from hydrogen, an unsubstituted alkyl group having 1 to 30 carbon atoms, an alkyl group substituted with a halogen and having 1 to 30 carbon atoms, an unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a cycloalkyl group substituted with a halogen and having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 15 carbon atoms, an alkynyl group having 2 to 15 carbon atoms, and a group represented by formula (A); Alternatively, at least two L4 are selected from groups represented by formula (A): (5) at least two L5 are selected from -OT5; Alternatively, T4 is selected from any one of hydrogen, a group represented by formula (A), an unsubstituted alkyl group having 1 to 30 carbon atoms, an alkyl group substituted with a halogen and having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms; More preferably, at least two T4 are selected from groups of formula (A).

[0016] In some embodiments thereof, the silicon compound comprises at least one of formulas (1) to (3): Optionally, G is phosphorus.

[0017] In some embodiments thereof, the silicon compound comprises at least one of tris(trimethylsilyl) borate, tris(trimethylsilyl) phosphate, tris(trimethylsilyl) phosphite, bis(trimethylsilyl) difluorobisphosphate, tetrakis(trimethylsilyl) pyrophosphate, bis(trimethylsilyl) pyromonofluorophosphate, bis(trimethylsilyl) fluorophosphite, (trimethylsilyl) difluorophosphate, hexamethyldisilazane, bistrimethylsilylated vinyl phosphate, tris(vinyldimethylsilane) phosphate, tris(phenyldimethylsilane) phosphate, trimethylsilyl methanesulfonate, heptamethyldisilazane, and ethylhexamethyldisilazane. In some embodiments thereof, the silicon compound comprises at least one of tris(trimethylsilyl) phosphite, tris(trimethylsilyl) phosphate, bis(trimethylsilyl) fluorophosphite, tris(trimethylsilyl) borate, hexamethyldisilazane, bis(trimethylsilyl) difluorobisphosphate, tetrakis(trimethylsilyl) pyrophosphate, bistrimethylsilylated vinyl phosphate, tris(vinyldimethylsilane) phosphate, tris(phenyldimethylsilane) phosphate, and trimethylsilyl methanesulfonate; Optionally, the silicon compound comprises at least one of tris(trimethylsilyl) phosphite, tris(trimethylsilyl) phosphate, bis(trimethylsilyl) fluorophosphite, bis(trimethylsilyl) difluorobisphosphate, tetrakis(trimethylsilyl) pyrophosphate, bistrimethylsilylated vinyl phosphate, tris(vinyldimethylsilane) phosphate, and tris(phenyldimethylsilane) phosphate.

[0018] Optionally, the silicon compound comprises at least one of tris(trimethylsilyl) phosphite, tris(trimethylsilyl) phosphate, bis(trimethylsilyl) fluorophosphite, bis(trimethylsilyl) difluorobisphosphate, tetrakis(trimethylsilyl) pyrophosphate, bistrimethylsilylated vinyl phosphate, tris(vinyldimethylsilane) phosphate, and tris(phenyldimethylsilane) phosphate.

[0019] When the silicon compound in the electrode plate further contains a phosphate ester or hypophosphite ester structure, the amount of transition metal eluted from the active material of the electrode plate during cycle use can be reduced, the composition stability of the electrode plate can be improved, and the efficiency and cycle performance of the battery can be further improved.

[0020] In some embodiments, the mass percentage of the silicon compound in the electrode film layer is 0.1% to 1.2%; Optionally, the mass proportion of the silicon compound is 0.2% to 1%.

[0021] The mass proportion of the silicon compound in the electrode film layer is adjusted to improve the water removal ability and by-product adsorption ability of the electrode plate, while minimizing the adverse effects of the silicon compound on other components in the electrode film layer.

[0022] In some embodiments thereof, the components of the electrode film layer further include a positive electrode active material, and the positive electrode active material is (1) The positive electrode active material includes any one of a positive electrode active material for a lithium ion battery, a positive electrode active material for a sodium ion battery, and a positive electrode active material for a potassium ion battery; (2) The positive electrode active material contains a transition metal element, optionally, the transition metal comprises elemental iron; (3) In the electrode film layer, the mass ratio of the positive electrode active material is 70% to 99.8%.

[0023] In some of these embodiments, the positive electrode active material is a positive electrode active material of a sodium ion battery.

[0024] As the supply of lithium resources becomes increasingly strained, sodium ion batteries, which have a more abundant storage of raw materials for the positive electrode active material and a lower cost, have come into people's view. However, compared with the positive electrode active material of lithium ion batteries, the conventional positive electrode active material of sodium ion batteries has a higher water absorption rate, is more likely to adsorb moisture, and seriously hinders the improvement of the performance of sodium ion batteries. By adopting the technical solution of this application, the stability of sodium ion batteries can be improved, thereby improving the Coulomb efficiency and cycle performance of sodium ion batteries.

[0025] In some of these embodiments, the positive electrode active material includes at least one of NaFePO4, Na3V2(PO4)3, Na4Fe3(PO4)2(P2O7), NaM1PO‎4F, Na a M2 b M3 c (CN)6 and Na3(VO y )2(PO4)2F (3-2y) , where M2 and M3 are each independently selected from at least one of Ni, Cu, Fe, Mn, Co, and Zn, 0 < a ≤ 2, 0 < b < 1, 0 < c < 1, M1 is selected from at least one of V, Fe, Mn, and Ni, and 0 ≤ y ≤ 1.

[0026] In some of these embodiments, the components of the electrode film layer further include a conductive agent and an adhesive. Optionally, in the electrode film layer, the mass ratio of the conductive agent is 1% - 20%. Optionally, in the electrode film layer, the mass ratio of the adhesive is 1% - 10%.

[0027] In some of these embodiments, the water content of the electrode film layer is ≤ 400 ppm. Optionally, the water content of the electrode film layer is ≤ 350 ppm.

[0028] A second aspect of the present application provides a method for manufacturing the electrode plate of the first aspect, the method comprising: The method includes applying the membrane layer slurry to a surface of a current collector to form an electrode membrane layer, thereby manufacturing an electrode plate; The components of the membrane layer slurry include a silicon compound.

[0029] A third aspect of the present application provides a battery, the battery including the electrode plate of the first aspect or an electrode plate manufactured by the method for manufacturing an electrode plate of the second aspect. The battery has a relatively high coulombic efficiency and good cycling performance.

[0030] A fourth aspect of the present application provides a power consuming device including a battery of the third aspect.

[0031] In order to more clearly explain the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be used in the embodiments of the present application. It is obvious that the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on the drawings without exerting any creative efforts. [Brief explanation of the drawings]

[0032] [Figure 1] FIG. 1 is a schematic diagram of one embodiment of a battery. [Figure 2] FIG. 2 is an exploded view of FIG. 1. [Figure 3] FIG. 1 is a schematic diagram of one embodiment of a battery pack. [Figure 4] FIG. 4 is an exploded view of FIG. 3. [Figure 5] 1 is a schematic diagram of an embodiment of a power consuming device that uses a battery as a power source. DETAILED DESCRIPTION OF THE INVENTION

[0033] The following detailed description will be given of the embodiments of the technical solution of the present application in conjunction with the drawings. The following embodiments are merely for the purpose of more clearly illustrating the technical solution of the present application, and are for illustrative purposes only and should not be construed as limiting the scope of protection of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art of this application, and the terms used herein are only for describing specific embodiments and are not intended to limit this application. The terms "comprises" and "having" and any variations thereof in the specification and claims of this application and the description of the drawings above are intended to cover a non-exclusive "comprise."

[0035] In the description of the embodiments of the present application, the technical terms "first," "second," etc. are merely used to distinguish between different objects, and should not be understood as indicating or suggesting the relative importance or implicitly specifying the number, specific order, or hierarchical relationship of the indicated technical features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0036] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. Appearances of this phrase in various locations throughout the specification do not necessarily all refer to the same embodiment, nor are they mutually exclusive, independent, or alternative embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments of this application, the term "and / or" is merely a relation that describes related objects and indicates that three relations may exist. For example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. In addition, the character " / " in this specification generally indicates that the related objects before and after are in an "or" relationship.

[0038] In describing the embodiments of the present application, the term "plurality" refers to two or more (including two); similarly, "sets" refers to two or more (including two sets); and "plurality" refers to two or more (including two).

[0039] In describing the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" are orientations or positional relationships shown in the drawings, and are intended merely to facilitate and simplify the description of the embodiments of the present application. They do not indicate or imply that the devices or elements referred to have a specific orientation or must be configured and operated in a specific orientation, and therefore should not be understood as limitations on the embodiments of the present application.

[0040] In the description of the embodiments of the present application, unless otherwise clearly defined or limited, the technical terms "attached," "connected," "connected," "fixed," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art may understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0041] In this application, the term "alkyl group" refers to the group formed after an alkane loses one hydrogen, for example, methane forms a methyl group after losing one hydrogen, and "alkenyl or alkynyl group" refers to the group formed after an alkene or alkyne loses one hydrogen, for example, ethylene forms a vinyl group after losing one hydrogen, and acetylene forms an ethynyl group after losing one hydrogen.

[0042] The term "paraffin" refers to paraffins in which all carbon atoms are joined by single carbon-carbon bonds and do not form rings, and all other valence bonds are connected to hydrogen, and includes straight-chain paraffins and branched-chain paraffins.

[0043] In the present application, the number of carbon atoms in the "chain alkyl group having 1 to 30 carbon atoms" is 1 to 30, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30, and non-limiting examples thereof include a methane group, an ethyl alkyl group, an n-propane group, an isopropyl alkyl group, an n-butyl alkyl group, an isobutyl alkyl group, and a 2-ethylbutyl alkyl group. These include 3,3-dimethylbutylalkyl groups, n-pentyl groups, isopentyl groups, neopentyl groups, 1-methylpentyl groups, 3-methylpentyl groups, 2-ethylpentyl groups, 4-methyl-2-pentyl groups, n-hexane groups, 1-methylhexane groups, 2-ethylhexane groups, 2-butylhexane groups, n-heptyl groups, 1-methylheptyl groups, 2,2-dimethylheptyl groups, 2-ethylheptyl groups, n-octyl groups, n-nonyl groups, and n-decyl groups.

[0044] In this application, the "number of ring atoms" refers to the number of atoms bonded to a ring, and when this ring is substituted with a substituent, the atoms contained in the substituent are not included in the atoms that make up the ring. The same applies to the "number of ring atoms" described below unless otherwise specified. For example, the number of ring atoms in a benzene ring is 6, the number of ring atoms in a naphthalene ring is 10, and the number of ring atoms in a thiophene ring is 5.

[0045] The term "aryl group" refers to a hydrocarbon group containing at least one aromatic ring, including non-fused aryl groups and fused aryl groups. A fused aryl group refers to a group formed by bonding two or more aromatic rings through two adjacent common ring atoms, i.e., a fused ring. Non-limiting examples of aryl groups include, but are not limited to, phenyl, naphthyl, anthryl, phenanthryl, biphenyl, terphenyl, benzo[9,10]phenanthryl, pyrenyl, benzofluoranthene, furyl, and dibenzocycloalkyl groups (e.g., fluorenyl and dihydroanthracene).

[0046] In this application, the term "heteroaryl group" refers to a compound having a closed ring conjugated system and containing heteroatoms. The heteroatom may be at least one of boron, oxygen, nitrogen, phosphorus, silicon, and sulfur, and the number of heteroatoms in the heteroaryl group may be one, two, three, four, five, or more. The heteroaryl group may be a single-ring heteroaryl group or a fused-ring heteroaryl group. It should be understood that a fused aryl (hetero) group having one or more (two or more) carbonyl groups attached thereto is also considered a heteroaryl group. Specific examples of the heteroaryl group include a thienyl group, a furyl group, a pyrrolyl group, an imidazolyl group, a thiazolyl group, an oxazolyl group, an oxadiazolyl group, a triazolyl group, a pyridyl group, a triazinyl group, an acridinyl group, a pyridazinyl group, a pyrazinyl group, a quinolinyl group, a quinazolinyl group, a quinoxalinyl group, a phenoxazinyl group, a phthalazinyl group, a pyridopyrimidinyl group, a pyridopyrazinyl group, a pyrazinopyrazinyl group, an isoquinolyl group, an indolyl group, a carbazolyl group, a benzoxazolyl group, a benzimidazolyl group, a benzothiazolyl group, a benzocarbazinyl ... Examples of the benzothienyl group include, but are not limited to, azolyl group, benzothienyl group, dibenzothienyl group, thienothienyl group, benzofuranyl group, phenanthroline group, isoxazolyl group, thiadiazolyl group, phenothiazinyl group, phenoxathionyl group, dibenzo-p-dioxyl group, quinazolinone group, benzothiadiazolyl group, benzotriazolyl group, thianthracene group, phenothiazinyl group, phenoxathionyl group, thianthracene tetraoxide group, phenothia dioxide group, anthraquinone group, phenoxathiodioxide group, thioxanthene dioxide group, and the like.

[0047] In this application, the term "substituted or unsubstituted" means that the functional group described after this term may or may not have a substituent.

[0048] An "alkoxy group" refers to a group having the structure -OR, where R is an alkyl group, i.e., an alkyl group as defined above, attached to an adjacent group through an oxygen atom. Phrases incorporating this term, such as "an alkoxy group having 1-30 carbon atoms," mean that the alkyl group contains 1-30 carbon atoms. Examples of alkoxy groups include, but are not limited to, methoxy (-O-CH or -OMe), ethoxy (-O-CHCH or -OEt), and tert-butoxy (-O-(CH) or -OtBu).

[0049] In this application, halogen groups include chlorine, fluorine, bromine, and iodine.

[0050] In this application, when two groups are joined by one point of attachment, for example, [ka] In the above formula, when R is selected from a single bond, it means that the two groups are not necessarily connected by a specific group, but are directly connected by a single bond, i.e., [ka] Represents.

[0051] To summarize the above background, the power and cycle performance of conventional secondary batteries are increasingly unable to meet people's needs. Prior art has focused primarily on developing new materials or adjusting the amount of active material loaded on the electrode plate to improve battery efficiency and cycle performance. However, the development of new materials is a long and difficult process, and no substantial progress has been made to date. Adjusting the amount of active material loaded on the electrode plate also brings with it other adverse effects, such as excessive loading making the electrode plate more susceptible to cracking, ultimately limiting the improvement of cycle performance. Based on this, after much creative research, an electrode plate capable of improving the efficiency and cycle performance of the battery in the present application was obtained.

[0052] One embodiment of the present application provides an electrode plate, the electrode plate including a current collector and an electrode film layer provided on a surface of the current collector, wherein a component of the electrode film layer includes a silicon compound, and the silicon compound has a group represented by formula (A): [ka] In formula (A), each R1 is independently selected from any one of hydrogen, a substituted or unsubstituted alkyl group, an alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and each R1 is not simultaneously hydrogen; The symbol "*" indicates the bonding site between the group represented by formula (A) and another structure in the silicon compound.

[0053] In the above-mentioned electrode plate, the silicon compound in the electrode film layer contains a group represented by a specific formula (A). On the one hand, the silicon compound can capture moisture in the electrode film layer, and can also capture moisture in the electrolyte during battery production, thereby reducing the moisture in the battery system and reducing side reactions caused by moisture in the battery system; on the other hand, during battery production, the silicon compound in the electrode plate can also react with the corrosive by-product HF generated in the electrolyte, thereby capturing corrosive by-products such as HF. This acts in two major ways to improve the stability of the battery, and improve the coulomb efficiency and cycle performance of the battery.

[0054] It should be noted that the current collector in the electrode plate has two surfaces facing each other in the thickness direction thereof, and the electrode film layer is disposed on either one or both of the two facing surfaces of the current collector. Furthermore, the electrode film layer may be any functional layer disposed on the surface of the current collector, including, but not limited to, an active layer and other functional layers. For example, the electrode film layer may be an active layer formed by mixing a silicon compound and an active material, or a functional layer newly formed by directly applying a silicon compound.

[0055] In some of the embodiments, the electrode film layer is an active layer.

[0056] As can be understood, "*" represents a bonding site between the group represented by formula (A) and another structure in the silicon compound, and means that at least one electron of the group represented by formula (A) is bonded to one electron of another structure in the silicon compound by forming a covalent bond.

[0057] In some embodiments thereof, each R1 is independently selected from any one of hydrogen, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms.

[0058] As can be understood, in this application, the range of selection for each R1 group is the same, but the types of groups specifically selected may be the same or different.

[0059] Alternatively, each R1 is independently selected from any one of hydrogen, an unsubstituted alkyl group having 1 to 15 carbon atoms, an alkyl group substituted with a halogen and having 1 to 15 carbon atoms, an unsubstituted cycloalkyl group having 3 to 15 carbon atoms, a cycloalkyl group substituted with a halogen and having 3 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, a substituted or unsubstituted aryl group having 6 to 20 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 20 ring atoms, an alkenyl group having 2 to 15 carbon atoms, and an alkynyl group having 2 to 15 carbon atoms.

[0060] In some embodiments thereof, each R1 is independently selected from any one of hydrogen, an unsubstituted alkyl group having 1 to 15 carbon atoms, an alkyl group substituted with a halogen and having 1 to 15 carbon atoms, an unsubstituted cycloalkyl group having 3 to 15 carbon atoms, a cycloalkyl group substituted with a halogen and having 3 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, an unsubstituted aryl group having 6 to 20 ring atoms, an aryl group having 6 to 20 ring atoms substituted with a C1 to C5 alkyl group or a halogen, an unsubstituted heteroaryl group having 5 to 20 ring atoms, a heteroaryl group having 5 to 20 ring atoms substituted with a C1 to C5 alkyl group or a halogen, an alkenyl group having 2 to 15 carbon atoms, and an alkynyl group having 2 to 15 carbon atoms.

[0061] Optionally, the heteroaromatic group contains at least one heteroatom.

[0062] In some embodiments thereof, the heteroatoms in the heteroaromatic group include at least one of boron, oxygen, nitrogen, phosphorus, silicon, and sulfur.

[0063] Optionally, the heteroatoms include at least one of B, O, and N.

[0064] In some embodiments thereof, each R1 is independently selected from any one of hydrogen, an unsubstituted alkyl group having 1 to 10 carbon atoms, an alkyl group substituted with a halogen and having 1 to 10 carbon atoms, an unsubstituted cycloalkyl group having 3 to 10 carbon atoms, a cycloalkyl group substituted with a halogen and having 3 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an unsubstituted aryl group having 6 to 10 ring atoms, an aryl group having 6 to 10 ring atoms substituted with a C1 to C5 alkyl group or a halogen, an unsubstituted heteroaryl group having 5 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms substituted with a C1 to C5 alkyl group or a halogen, an alkenyl group having 2 to 10 carbon atoms, and an alkynyl group having 2 to 10 carbon atoms.

[0065] In some embodiments thereof, each R1 is independently selected from any one of hydrogen, an alkyl chain group having 1 to 5 carbon atoms, an alkyl chain group substituted with a halogen and having 1 to 5 carbon atoms, an unsubstituted cycloalkyl group having 3 to 6 carbon atoms, a cycloalkyl group substituted with a halogen and having 3 to 6 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an unsubstituted aryl group having 6 to 5 ring atoms, an aryl group having 6 to 10 ring atoms substituted with a C1 to C5 alkyl group or a halogen, an unsubstituted heteroaryl group having 5 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms substituted with a C1 to C5 alkyl group or a halogen, an alkenyl group having 2 to 5 carbon atoms, and an alkynyl group having 2 to 5 carbon atoms.

[0066] In some embodiments, each R1 is the same.

[0067] In some of these embodiments, the halogen is selected from F.

[0068] In some embodiments thereof, the silicon compound further comprises a D group, wherein the D group is selected from at least one of a borate ester group, a phosphate ester group, a phosphinate ester group, a sulfonate ester group, and an amine group.

[0069] As can be seen, the D group and the group of formula (A) are linked through an oxygen atom on the D group, thereby forming a silyl ester group.

[0070] Optionally, the group D is selected from at least one group of a borate ester group, a phosphate ester group, and a phosphinate ester group, and the group D and the group represented by formula (A) are bonded via an oxygen atom.

[0071] Research findings: When silicon compounds contain a borate ester structure, they can further participate in the formation of an SEI (or CEI) film when used in battery manufacturing, further improving the film structure and toughness, thereby further improving the cycle performance of the battery.

[0072] Further research has revealed that if the silicon compound in the electrode plate further contains a phosphate ester or hypophosphite ester structure, the amount of transition metal elution in the active material of the electrode plate can be reduced during cycle use, improving the composition stability of the electrode plate and further improving the efficiency and cycle performance of the battery.

[0073] Research has shown that the above phenomenon may occur because the phosphate or phosphinate groups on the surface of the electrode plate can react with oxidizing substances generated during the charge and discharge process of the battery, reducing the parasitic oxidation current and inhibiting the decomposition of the oxidizing substances on the electrode material, thereby improving the composition stability of the electrode plate during the charge and discharge process.

[0074] In some embodiments thereof, the silicon compound comprises at least one of formulas (1)-(5): [ka] G is selected from boron or phosphorus, each L1 is independently selected from any one of a halogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT1, and at least one L1 is -OT1, T1 is selected from any one of hydrogen, a group represented by formula (A), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and at least one T1 is a group represented by formula (A).

[0075] As can be seen, the silicon compound of formula (1) contains at least one group of formula (A).

[0076] In some embodiments thereof, each L1 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 15 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 15 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms, an aryl group having 6 to 30 ring atoms, a heteroaryl group having 5 to 25 ring atoms, an alkenyl group having 2 to 15 carbon atoms, an alkynyl group having 2 to 15 carbon atoms, a group represented by formula (A), and -OT1.

[0077] In some embodiments thereof, each L1 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 10 carbon atoms, a chain alkyl group having 1 to 10 carbon atoms substituted with a halogen, a cycloalkyl group having 3 to 10 carbon atoms, an aryl group having 6 to 15 ring atoms, a heteroaryl group having 5 to 15 ring atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, a group represented by formula (A), and -OT1.

[0078] In some embodiments thereof, each L1 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 5 carbon atoms, a chain alkyl group having 1 to 5 carbon atoms substituted with a halogen, a cycloalkyl group having 3 to 6 carbon atoms, an aryl group having 6 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms, an alkenyl group having 2 to 5 carbon atoms, an alkynyl group having 2 to 5 carbon atoms, a group represented by formula (A), and -OT1.

[0079] In some embodiments, each L1 may be the same or different.

[0080] Furthermore, each T1 may be the same or different.

[0081] In some embodiments, each L1 is the same.

[0082] In some embodiments thereof, at least two L1's are selected from -OT1.

[0083] In some embodiments, each L1 is -OT1.

[0084] Alternatively, T1 is selected from any one of hydrogen, a group represented by formula (A), a chain alkyl group having 1 to 30 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 30 carbon atoms, an aryl group having 6 to 30 ring atoms, a heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms.

[0085] In some embodiments thereof, T1 is selected from any one of hydrogen, a group represented by formula (A), an alkyl group having 1 to 15 carbon atoms, an alkyl group having 1 to 15 carbon atoms substituted with a halogen, an aryl group having 6 to 15 ring atoms, a heteroaryl group having 5 to 15 ring atoms, an alkenyl group having 2 to 15 carbon atoms, and an alkynyl group having 2 to 15 carbon atoms, and at least one T1 is a group represented by formula (A).

[0086] In some embodiments thereof, T1 is selected from any one of hydrogen, a group represented by formula (A), an alkyl group having 1 to 10 carbon atoms, an alkyl group having 1 to 10 carbon atoms substituted with a halogen, an aryl group having 6 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms, an alkenyl group having 2 to 10 carbon atoms, and an alkynyl group having 2 to 10 carbon atoms, and at least one T1 is a group represented by formula (A).

[0087] In some embodiments thereof, T1 is selected from any one of hydrogen, a group represented by formula (A), an alkyl group having 1 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms substituted with a halogen, an aryl group having 6 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms, an alkenyl group having 2 to 5 carbon atoms, and an alkynyl group having 2 to 5 carbon atoms, and at least one T1 is a group represented by formula (A).

[0088] In some embodiments thereof, at least two T1 are selected from groups represented by formula (A).

[0089] In some of these embodiments, each T1 is selected from the group represented by formula (A).

[0090] Each L2 is independently selected from any one of a halogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT2, and at least one L2 is selected from -OT2, T2 is selected from any one of hydrogen, a group represented by formula (A), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and at least one T2 is selected from a group represented by formula (A).

[0091] In other words, formula (2) contains at least one group represented by formula (A).

[0092] In some embodiments thereof, each L2 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 30 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 30 carbon atoms, a cycloalkyl group having 3 to 30 carbon atoms, an aryl group having 6 to 50 ring atoms, a heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT2.

[0093] In some embodiments thereof, each L2 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 15 carbon atoms, a chain alkyl group having 1 to 15 carbon atoms substituted with a halogen, a cycloalkyl group having 3 to 15 carbon atoms, an aryl group having 6 to 25 ring atoms, a heteroaryl group having 5 to 25 ring atoms, an alkenyl group having 2 to 15 carbon atoms, an alkynyl group having 2 to 15 carbon atoms, a group represented by formula (A), and -OT2.

[0094] In some embodiments thereof, each L2 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 10 carbon atoms, a chain alkyl group having 1 to 10 carbon atoms substituted with a halogen, a cycloalkyl group having 3 to 10 carbon atoms, an aryl group having 6 to 15 ring atoms, a heteroaryl group having 5 to 15 ring atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, a group represented by formula (A), and -OT2.

[0095] In some embodiments thereof, each L2 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 5 carbon atoms, a chain alkyl group having 1 to 5 carbon atoms substituted with a halogen, a cycloalkyl group having 3 to 6 carbon atoms, an aryl group having 6 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms, an alkenyl group having 2 to 5 carbon atoms, an alkynyl group having 2 to 5 carbon atoms, a group represented by formula (A), and -OT2.

[0096] In some embodiments, each L2 may be the same or different.

[0097] In some embodiments, each L2 is the same.

[0098] In some embodiments thereof, at least two L2 are selected from -OT2.

[0099] In some embodiments, each L2 is selected from -OT2.

[0100] In some of these embodiments, T2 is selected from any one of hydrogen, a group represented by formula (A), a chain alkyl group having 1 to 30 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 30 carbon atoms, an aryl group having 6 to 30 ring atoms, a heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms.

[0101] In some embodiments thereof, T2 is selected from any one of hydrogen, a group represented by formula (A), an alkyl group having 1 to 15 carbon atoms, an alkyl group having 1 to 15 carbon atoms substituted with a halogen, an aryl group having 6 to 15 ring atoms, a heteroaryl group having 5 to 15 ring atoms, an alkenyl group having 2 to 15 carbon atoms, and an alkynyl group having 2 to 15 carbon atoms, and at least one T2 is a group represented by formula (A).

[0102] In some embodiments thereof, T2 is selected from any one of hydrogen, a group represented by formula (A), an alkyl group having 1 to 10 carbon atoms, an alkyl group having 1 to 10 carbon atoms substituted with a halogen, an aryl group having 6 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms, an alkenyl group having 2 to 10 carbon atoms, and an alkynyl group having 2 to 10 carbon atoms, and at least one T2 is a group represented by formula (A).

[0103] In some embodiments thereof, T2 is selected from any one of hydrogen, a group represented by formula (A), an alkyl group having 1 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms substituted with a halogen, an aryl group having 6 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms, an alkenyl group having 2 to 5 carbon atoms, and an alkynyl group having 2 to 5 carbon atoms, and at least one T2 is selected from the group represented by formula (A).

[0104] More preferably, at least two T2 are selected from groups of formula (A).

[0105] In some of these embodiments, T2 is selected from groups represented by formula (A).

[0106] Y is selected from a single bond or oxygen, each L3 is independently selected from any one of a halogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT3, and at least one L3 is -OT3, and T3 is selected from any one of hydrogen, a group represented by formula (A), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and at least one T3 is a group represented by formula (A).

[0107] In some embodiments thereof, each L3 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 30 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 30 carbon atoms, a cycloalkyl group having 3 to 30 carbon atoms, an aryl group having 6 to 50 ring atoms, a heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT3.

[0108] In some embodiments thereof, each L3 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 15 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 15 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms, an aryl group having 6 to 25 ring atoms, a heteroaryl group having 5 to 25 ring atoms, an alkenyl group having 2 to 15 carbon atoms, an alkynyl group having 2 to 15 carbon atoms, a group represented by formula (A), and -OT3.

[0109] In some embodiments thereof, each L3 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 10 carbon atoms, a cycloalkyl group substituted with a halogen and having 3 to 10 carbon atoms, an aryl group having 6 to 15 ring atoms, a heteroaryl group having 5 to 15 ring atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, a group represented by formula (A), and -OT3.

[0110] In some embodiments thereof, each L3 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 5 carbon atoms, a chain alkyl group having 1 to 5 carbon atoms substituted with a halogen, a cycloalkyl group having 3 to 6 carbon atoms, an aryl group having 6 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms, an alkenyl group having 2 to 5 carbon atoms, an alkynyl group having 2 to 5 carbon atoms, a group represented by formula (A), and -OT3.

[0111] In some embodiments, each L3 may be the same or different.

[0112] In some embodiments thereof, two L3's are selected from -OT3.

[0113] More preferably, at least two T3 are selected from groups of formula (A).

[0114] In some of these embodiments, each T3 is selected from the group represented by formula (A).

[0115] Each L4 is independently selected from any one of hydrogen, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, and a group represented by formula (A), and at least one L4 is a group represented by formula (A).

[0116] In other words, formula (4) contains at least one group represented by formula (A).

[0117] In some embodiments thereof, each L4 is independently selected from any one of hydrogen, a chain alkyl group having 1 to 30 carbon atoms, a chain alkyl group having 1 to 30 carbon atoms substituted with a halogen, a cycloalkyl group having 3 to 30 carbon atoms, an aryl group having 6 to 50 ring atoms, a heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, and a group represented by formula (A).

[0118] In some embodiments thereof, each L4 is independently selected from any one of hydrogen, a chain alkyl group having 1 to 15 carbon atoms, a chain alkyl group having 1 to 15 carbon atoms substituted with a halogen, a cycloalkyl group having 3 to 15 carbon atoms, an aryl group having 6 to 25 ring atoms, a heteroaryl group having 5 to 25 ring atoms, an alkenyl group having 2 to 15 carbon atoms, an alkynyl group having 2 to 15 carbon atoms, and a group represented by formula (A).

[0119] In some of these embodiments, each L4 is independently selected from any one of hydrogen, a chain alkyl group having 1 to 10 carbon atoms, a chain alkyl group having 1 to 10 carbon atoms substituted with a halogen, a cycloalkyl group having 3 to 10 carbon atoms, an aryl group having 6 to 15 ring atoms, a heteroaryl group having 5 to 15 ring atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, and a group represented by formula (A).

[0120] In some of these embodiments, each L4 is independently selected from any one of hydrogen, a chain alkyl group having 1 to 5 carbon atoms, a chain alkyl group having 1 to 5 carbon atoms substituted with a halogen, a cycloalkyl group having 3 to 6 carbon atoms, an aryl group having 6 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms, an alkenyl group having 2 to 5 carbon atoms, an alkynyl group having 2 to 5 carbon atoms, and a group represented by formula (A).

[0121] In some embodiments, each L4 may be the same or different.

[0122] In some embodiments thereof, at least two L4 are selected from groups represented by formula (A).

[0123] Each L5 is independently selected from any one of a halogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT5, and at least one L5 is -OT4, T4 is selected from any one of hydrogen, a group represented by formula (A), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and at least one T4 is a group represented by formula (A).

[0124] In other words, formula (5) contains at least one group represented by formula (A).

[0125] In some embodiments thereof, each L5 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 30 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 30 carbon atoms, a cycloalkyl group having 3 to 30 carbon atoms, an aryl group having 6 to 50 ring atoms, a heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT5.

[0126] In some embodiments thereof, each L5 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 15 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 15 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 15 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms, an aryl group having 6 to 25 ring atoms, a heteroaryl group having 5 to 25 ring atoms, an alkenyl group having 2 to 15 carbon atoms, an alkynyl group having 2 to 15 carbon atoms, a group represented by formula (A), and -OT5.

[0127] In some embodiments thereof, each L5 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 10 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 10 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, an aryl group having 6 to 15 ring atoms, a heteroaryl group having 5 to 15 ring atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, a group represented by formula (A), and -OT5.

[0128] In some embodiments thereof, each L5 is independently selected from any one of a halogen atom, a chain alkyl group having 1 to 5 carbon atoms, a chain alkyl group having 1 to 5 carbon atoms substituted with a halogen, a cycloalkyl group having 3 to 6 carbon atoms, an aryl group having 6 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms, an alkenyl group having 2 to 5 carbon atoms, an alkynyl group having 2 to 5 carbon atoms, a group represented by formula (A), and -OT5.

[0129] In some embodiments, each L5 is the same or different.

[0130] In some embodiments thereof, at least two L5 are selected from -OT5.

[0131] In some embodiments, each L5 is selected from -OT5.

[0132] In some of these embodiments, T4 is selected from any one of hydrogen, a group represented by formula (A), a chain alkyl group having 1 to 30 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 30 carbon atoms, an aryl group having 6 to 30 ring atoms, a heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms.

[0133] In some of these embodiments, T4 is selected from any one of hydrogen, a group represented by formula (A), a chain alkyl group having 1 to 15 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 15 carbon atoms, an aryl group having 6 to 15 ring atoms, a heteroaryl group having 5 to 15 ring atoms, an alkenyl group having 2 to 15 carbon atoms, and an alkynyl group having 2 to 15 carbon atoms.

[0134] In some of these embodiments, T4 is selected from any one of hydrogen, a group represented by formula (A), a chain alkyl group having 1 to 10 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 10 carbon atoms, an aryl group having 6 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms, an alkenyl group having 2 to 10 carbon atoms, and an alkynyl group having 2 to 10 carbon atoms.

[0135] In some of these embodiments, T4 is selected from any one of hydrogen, a group represented by formula (A), a chain alkyl group having 1 to 5 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 5 carbon atoms, an aryl group having 6 to 10 ring atoms, a heteroaryl group having 5 to 10 ring atoms, an alkenyl group having 2 to 5 carbon atoms, and an alkynyl group having 2 to 5 carbon atoms.

[0136] In some embodiments thereof, at least two T4 are selected from groups represented by formula (A).

[0137] In some of these embodiments, each T4 is selected from the group represented by formula (A).

[0138] In some embodiments thereof, the silicon compound comprises at least one of formulas (1) to (3).

[0139] Optionally, G is phosphorus.

[0140] In some embodiments thereof, the silicon compound comprises at least one of tris(trimethylsilyl) borate, tris(trimethylsilyl) phosphate, tris(trimethylsilyl) phosphite, bis(trimethylsilyl) difluorobisphosphate, tetrakis(trimethylsilyl) pyrophosphate, bis(trimethylsilyl) pyromonofluorophosphate, bis(trimethylsilyl) fluorophosphite, (trimethylsilyl) difluorophosphate, hexamethyldisilazane, bistrimethylsilylated vinyl phosphate, tris(vinyldimethylsilane) phosphate, tris(phenyldimethylsilane) phosphate, trimethylsilyl methanesulfonate, heptamethyldisilazane, and ethylhexamethyldisilazane.

[0141] In some embodiments thereof, the silicon compound comprises at least one of tris(trimethylsilyl) phosphite, tris(trimethylsilyl) phosphate, bis(trimethylsilyl) fluorophosphite, tris(trimethylsilyl) borate, hexamethyldisilazane, bis(trimethylsilyl) difluorobisphosphate, tetrakis(trimethylsilyl) pyrophosphate, bistrimethylsilylated vinyl phosphate, tris(vinyldimethylsilane) phosphate, tris(phenyldimethylsilane) phosphate, and trimethylsilyl methanesulfonate.

[0142] Optionally, the silicon compound comprises at least one of tris(trimethylsilyl) phosphite, tris(trimethylsilyl) phosphate, bis(trimethylsilyl) fluorophosphite, bis(trimethylsilyl) difluorobisphosphate, tetrakis(trimethylsilyl) pyrophosphate, bistrimethylsilylated vinyl phosphate, tris(vinyldimethylsilane) phosphate, and tris(phenyldimethylsilane) phosphate.

[0143] In some of the embodiments, the mass percentage of the silicon compound in the electrode film layer is 0.1% to 1.2%.

[0144] Optionally, the mass proportion of the silicon compound is 0.2% to 1%.

[0145] The mass proportion of the silicon compound in the electrode film layer is adjusted to improve the water removal ability and by-product adsorption ability of the electrode plate, while minimizing the adverse effects of the silicon compound on other components in the electrode film layer.

[0146] In the above "0.1% to 1.2%", the value includes the minimum and maximum values ​​of this range, and each value between such minimum and maximum values. Specific examples include, but are not limited to, the point values ​​in the examples and the following point values: 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or a range consisting of any two numerical values, for example, 0.1% to 0.2%, 0.1% to 0.3%, 0.1% to 0.4%, 0.1% to 0.5%, 0.1% to 0.6%, 0.1% to 0.7%, 0.1% to 0.8%, 0.1% to 0.9%, 0.2% to 0.3%, 0.2% to 0.4%, 0.2% ~0.5%, 0.2%~0.6%, 0.2%~0.7%, 0.2%~0.8%, 0.2%~0.9%, 0.2%~1%, 0.3%~0.4%, 0.3%~0.5%, 0.3%~0.6%, 0.3%~0.7%, 0.3%~0.8%, 0.3%~0.9%, 0.3%~1%, 0.4%~0.5%, 0. 4%~0.6%, 0.4%~0.7%, 0.4%~0.8%, 0.4%~0.9%, 0.4%~1%, 0.5%~0.6%, 0.5%~0.7%, 0.5%~0.8%, 0.5%~0.9%, 0.5%~1%, 0.6%~0.7%, 0.6%~0.8%, 0.6%~0.9%, 0.6%~1%.

[0147] In some of these embodiments, the components of the electrode film layer further include a positive electrode active material.

[0148] The positive electrode active material may be a commonly used positive electrode active material in the present application, such as a lithium ion positive electrode active material or a sodium ion positive electrode active material.

[0149] In some embodiments, the positive electrode active material includes one of a lithium ion battery positive electrode active material, a sodium ion battery positive electrode active material, and a potassium ion battery positive electrode active material.

[0150] In some of these embodiments, the active cathode material is a sodium ion battery active cathode material.

[0151] As the supply of lithium resources becomes increasingly scarce, secondary batteries with more abundant storage capacity and lower cost cathode materials for sodium-ion batteries have come into people's sights. However, compared with the cathode active materials for lithium-ion batteries, the cathode active materials for conventional sodium-ion batteries have higher water absorption and are more likely to adsorb moisture, which seriously hinders the improvement of the performance of sodium-ion batteries. By adopting the technical solution of the present application, the stability of sodium-ion batteries can be improved, thereby improving the coulombic efficiency and cycle performance of sodium-ion batteries.

[0152] In some of the embodiments, the positive electrode active material contains a transition metal element.

[0153] The transition metal includes at least one of chromium, manganese, iron, cobalt, nickel, copper, zinc, palladium, silver, platinum, and gold.

[0154] Optionally, the transition metal comprises elemental iron.

[0155] The positive electrode active material of a lithium ion battery, the positive electrode active material of a sodium ion battery, and the positive electrode active material of a potassium ion battery will be abbreviated below as lithium ion active material, sodium ion active material, and potassium ion active material, respectively.

[0156] Further, as an example, the lithium ion active material may include at least one of a lithium-containing phosphate with an olivine structure, a lithium transition metal oxide, and a modified compound thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material may also be used. These positive electrode active materials may be used alone or in combination of two or more. Here, examples of lithium transition metal oxides include lithium cobalt oxide (e.g., LiCoO), lithium nickel oxide (e.g., LiNiO), lithium manganese oxide (e.g., LiMnO, LiMnO), 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 (can be abbreviated as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (can be abbreviated as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (can be abbreviated as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (may be abbreviated as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which may be abbreviated as NCM811)], lithium nickel cobalt aluminum oxide (e.g., LiNi 0.8 Co 0.15 Al 0.05 Examples of lithium-containing phosphates with an olivine structure may include, but are not limited to, at least one of lithium iron phosphate (e.g., LiFePO4, which may be abbreviated as LFP), lithium manganese phosphate (e.g., LiMnPO4), and lithium manganese iron phosphate. In any embodiment of the present application, the molecular formula of the lithium ion active material is LiFe x Mn (1-x)PO4, where x is any number between 0 and 1.

[0157] As can be seen, when x is 0, LiFe x Mn (1-x) PO4 is LiMnPO4, lithium manganese phosphate, and when x is 1, LiFe x Mn (1-x) PO4 is LiFePO4 lithium iron phosphate (LFP).

[0158] It should be noted that the lithium content in the above-exemplified positive electrode material refers to the content when the battery is unused. During use, the battery may be repeatedly charged and discharged, and the Li in the positive electrode active material will change during the charge and discharge process. That is, the molar subscript of Li in the positive electrode active material in a battery product is not always maintained at 1, but will change, and the change range may be (0 to 1.2).

[0159] For example, LiFe x Mn (1-x) PO4 is further converted to Li y Fe x Mn (1-x) It can be expressed as PO4, where y is 0 to 1.1.

[0160] For example, the ternary material Li y (Ni a Co b Mn c ) (1-d) M d O (2-x) A z wherein y is 0.2 to 1.2, a+b+c=1, 0≦d≦1, 0≦x<2, M is one or more of Zr, Sr, B, Ti, Mg, Sn, and Al, and A is one or more of S, N, F, Cl, Br, and I.

[0161] The battery undergoes Li absorption / desorption and consumption during the charge / discharge process, and the molar content of Li varies when the battery is discharged to different states. The above limit for y includes the molar content of Li in different charge / discharge states of the battery. Furthermore, the battery voltage is generally between 2V-5V.

[0162] For example, the sodium ion active material may include at least one of a sodium transition metal oxide, a polyanion-type compound, and a Prussian blue-based compound, but the present application is not limited to these materials and may also use other conventionally known materials that can be used as positive electrode active materials in sodium ion batteries.

[0163] In an alternative technical solution of the present application, the transition metal in the sodium transition metal oxide includes at least one of Mn, Fe, Ni, Co, Cr, Cu, Ti, Zn, V, Zr, and Ce. The sodium transition metal oxide may be, for example, Na x MO2, where M includes at least one or more of Ti, V, Mn, Co, Ni, Fe, Cr, and Cu; <x≦1である。

[0164] As an alternative technical solution of the present application, the polyanion type compound is a compound containing sodium ions, transition metal ions, and tetrahedral (YO4) n- The compound may be a single compound having an anionic unit, wherein the transition metal includes at least one of Mn, Fe, Ni, Co, Cr, Cu, Ti, Zn, V, Zr, and Ce, Y includes at least one of P, S, and Si, and n is (YO4) n- represents the valence of

[0165] Polyanionic compounds include sodium ions, transition metal ions, and tetrahedral (YO4) n-The anion unit may be a compound having a halogen anion, wherein the transition metal includes at least one of Mn, Fe, Ni, Co, Cr, Cu, Ti, Zn, V, Zr, and Ce, Y includes at least one of P, S, and Si, and n is (YO4) n- The halogen may be at least one of F, Cl, and Br.

[0166] Polyanionic compounds can also contain sodium ions, tetrahedral (YO4) n- Anionic unit, polyhedral unit (ZO y ) m+ and optionally a halogen anion. Y may include at least one of P, S, and Si, and n may be (YO4) n- Z represents a transition metal, and includes at least one of Mn, Fe, Ni, Co, Cr, Cu, Ti, Zn, V, Zr, and Ce, and m represents a valence of (ZO y ) m+ The halogen may be at least one of F, Cl, and Br.

[0167] Examples of polyanion compounds include NaFePO4, Na3V2(PO4)3 (sodium vanadium phosphate, abbreviated as NVP), Na4Fe3(PO4)2(P2O7) (NFPP), NaM1PO4F, and Na3(VO y )2(PO4)2F (3-2y) At least one of the following is true.

[0168] M1 is at least one of V, Fe, Mn, and Ni, and 0≦y≦1.

[0169] Prussian blue compounds contain sodium ions, transition metal ions, and cyanide ions (CN -The transition metal may include at least one of Mn, Fe, Ni, Co, Cr, Cu, Ti, Zn, V, Zr, and Ce. The Prussian blue compound may be, for example, Na a M2 b M3 c (CN)6, wherein M2 and M3 are each independently selected from at least one of Ni, Cu, Fe, Mn, Co, and Zn; <a≦2、0<b<1、0<c<1である。

[0170] In any embodiment of the present application, the mass ratio of the positive electrode active material in the electrode film layer is 70% to 99.8%.

[0171] In any embodiment of the present application, the components of the electrode film layer further include a conductive agent and an adhesive.

[0172] For example, when the electrode plate is used as a positive electrode, the conductive agent may include at least one of graphite, carbon nanotubes, nanofibers, carbon black, and graphene, but is not limited to these, and may be any conductive agent commonly used in the art, specifically SP, KS-6, acetylene black, branched Ketjenblack ECP, SFG-6, vapor-grown carbon fiber VGCF, carbon nanotubes CNTs and graphene, and composite conductive agents thereof.

[0173] The adhesive may be at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, hydrogenated nitrile rubber, 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), and a fluorine-containing acrylate resin.

[0174] Optionally, in the electrode film layer, the mass percentage of the conductive agent is 1% to 20%.

[0175] Optionally, in the electrode film layer, the mass percentage of the adhesive is 1% to 10%.

[0176] In some embodiments thereof, the water content of the electrode membrane layer is ≦400 ppm.

[0177] Optionally, the water content of the electrode membrane layer is ≦350 ppm.

[0178] In some of the embodiments, the thickness of the electrode film layer is 30 μm to 200 μm.

[0179] In any embodiment of the present application, the current collector may be a metal foil sheet or a composite current collector. For example, aluminum foil may be used as the metal foil sheet. The composite current collector may include a polymer base layer and a metal layer formed on at least one surface of the polymer base layer. The composite current collector may be formed by forming a metal material on a polymer substrate.

[0180] In some embodiments thereof, the metallic material is selected from any one of aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys.

[0181] In some embodiments thereof, the polymeric substrate comprises at least one of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), and polyethylene (PE).

[0182] An embodiment of the present application further provides a method for manufacturing an electrode plate, which includes the following step S10.

[0183] In step S10, a membrane layer slurry is applied to the surface of a current collector to form an electrode membrane layer, and an electrode plate is manufactured. The membrane layer slurry contains the above-mentioned silicon compound.

[0184] The types and proportions of silicon compounds are the same as those described above and will not be further described here.

[0185] In any embodiment of the present application, a positive electrode plate can be manufactured in the following manner, taking a positive electrode plate as an example. The components for manufacturing the positive electrode plate are dispersed in a solvent (e.g., N-methylpyrrolidone) to form a positive electrode slurry. The positive electrode slurry is coated on a current collector, and then dried and cold-pressed to obtain a positive electrode plate. The positive electrode slurry has a solid content of 40 wt% to 80 wt%, and its viscosity at room temperature is adjusted to 5000 mPa·s to 25000 mPa·s. The positive electrode slurry is coated on the surface of a positive electrode current collector, dried, and then cold-pressed in a cold rolling mill to form a positive electrode plate.

[0186] In some of the examples, the areal density of the positive electrode active material contained in the positive electrode plate is 0.018 g / cm 2 ~0.05g / cm 2 is.

[0187] Areal density of positive electrode active material = mass of positive electrode active material / area of ​​positive electrode plate.

[0188] One embodiment of the present application provides a battery including the electrode plate or an electrode plate manufactured by the method for manufacturing the electrode plate.

[0189] The battery has a relatively high coulombic efficiency and good cycling performance. In the battery, at least one of the negative electrode plate or the positive electrode plate is selected from the electrode plate, and further, the electrode plate is a positive electrode plate, and the battery further includes a negative electrode plate, a separator, and an electrolyte, which are described herein in a non-limiting manner.

[0190] [Negative electrode] The negative electrode plate includes a current collector and a negative electrode active layer carried on the surface of the current collector.

[0191] The components of the negative electrode active layer include a negative electrode active material.

[0192] The negative electrode active material may be a general negative electrode active material in the present application.

[0193] In any embodiment of the present application, the negative electrode active material includes at least one of mesocarbon microbeads, graphite, glassy carbon, carbon nanotubes, carbon-carbon composites, carbon fibers, hard carbon, soft carbon, silicon-based materials, tin-based materials, magnesium-based materials, and iron-based materials.

[0194] Optionally, specific examples of the negative electrode active material include at least one of mesocarbon microbeads, natural graphite, artificial graphite, graphene, glassy carbon, carbon nanotubes, carbon fiber, hard carbon, soft carbon, iron oxide, tin oxide, silicon oxide, magnesium oxide, and silicon carbon composites, but are not limited thereto.

[0195] In any embodiment of the present application, the battery is a lithium battery, and the mass ratio of the negative electrode active material in the negative electrode active layer is 70% to 100%.

[0196] In any embodiment of the present application, the components of the negative electrode active layer further include a negative electrode conductive agent and a negative electrode adhesive.

[0197] In any embodiment of the present application, the negative electrode conductive agent may include at least one of graphite, carbon nanotubes, nanofibers, carbon black, and graphene, but is not limited to these, and may be a conductive material commonly used in the art, specifically SP, KS-6, acetylene black, branched Ketjenblack ECP, SFG-6, vapor-grown carbon fiber VGCF, carbon nanotubes (CNTs) and graphene, and composite conductive agents thereof.

[0198] The weight ratio of the negative electrode conductive agent in the negative electrode active layer is 0 to 20 wt % based on the total weight of the negative electrode active layer.

[0199] The negative electrode adhesive may be an adhesive commonly used in the art, and 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).

[0200] The weight ratio of the negative electrode adhesive in the negative electrode active layer is 0 to 30 wt % based on the total weight of the negative electrode active layer.

[0201] In any embodiment of the present application, the negative electrode active layer may further optionally contain other additives, such as a thickener, for example, carboxymethyl cellulose sodium (CMC-Na), etc. The weight ratio of the other additives in the negative electrode active layer is 0 to 15 wt %, based on the total weight of the negative electrode active layer.

[0202] In any embodiment of the present application, the current collector in the negative electrode plate may be a metal foil sheet or a composite current collector, for example, a copper foil may be used as the metal foil sheet.

[0203] The composite current collector may include a polymeric base layer and a metallic layer formed on at least one surface of the polymeric base layer. The composite current collector may be formed by forming a metallic material on a polymeric substrate.

[0204] In some embodiments thereof, the metallic material is selected from any one of aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys.

[0205] In some embodiments thereof, the polymeric substrate comprises at least one of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), and polyethylene (PE).

[0206] In any embodiment of the present application, a negative electrode plate may be manufactured as follows: the components for manufacturing the negative electrode plate, such as the negative electrode active material, conductive agent, adhesive, and any other components, are dispersed in a solvent (e.g., deionized water) to form a negative electrode slurry, which is then applied to a negative electrode current collector and subjected to processes such as drying and cold pressing to obtain a negative electrode plate. Here, the solids content of the negative electrode slurry is 30 wt% to 70 wt%, and the viscosity at room temperature is adjusted to 2000 mPa·s to 10000 mPa·s. The resulting negative electrode slurry is then coated onto a negative electrode current collector and subjected to processes such as drying and cold pressing, e.g., roll-to-roll pressing, to obtain a negative electrode plate.

[0207] In some of the examples, the areal density of the negative electrode active material contained in the negative electrode plate is 0.005 g / cm 2 ~0.03g / cm 2 is.

[0208] Areal density of negative electrode active material = mass of negative electrode active material / area of ​​negative electrode plate.

[0209] The electrolyte has excellent wettability to the electrode plate, and can more quickly wet the electrode plate, particularly when the active material loading on the electrode plate is relatively high and the thickness of the electrode plate is relatively high, thereby improving the interfacial wettability of the electrode and further promoting the capacity development efficiency of the battery.

[0210] It should be clarified that when a battery is a "sodium battery without a negative electrode," no negative electrode active material is added during the manufacturing process of the negative electrode plate, and only the negative electrode current collector or the current collector after being coated with a conductive agent is used as the nominal negative electrode, and the negative electrode current collector does not actually function as a negative electrode. After the battery is assembled and the initial charge is completed, the sodium element in the positive electrode migrates to the surface of the negative electrode current collector and forms a sodium metal layer on the negative electrode current collector, thereby obtaining a true negative electrode.

[0211] [Separator] The separator is provided between the positive electrode plate and the negative electrode plate.

[0212] The present application does not particularly limit the type of separator, and any known porous structure separator having good chemical stability and mechanical stability may be selected.

[0213] In some embodiments, the separator may be made of at least one material selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film, without any particular limitation. When the separator is a multi-layer composite film, the materials of each layer may be the same or different, without any particular limitation.

[0214] The thickness of the separator is controlled to be 2 μm to 15 μm, and optionally, the thickness of the separator is controlled to be 2 μm to 13 μm.

[0215] [Electrolyte] The electrolyte solution includes an electrolyte salt and a solvent.

[0216] In some embodiments, the electrolyte salt may be selected from electrolyte salts commonly used in the art, such as a lithium ion electrolyte salt, a sodium ion electrolyte salt, and a potassium ion electrolyte salt. The specific type may be selected depending on the type of the positive electrode active material. For example, when the positive electrode active material is a lithium ion positive electrode active material, the electrolyte salt is selected as a lithium ion electrolyte salt; when the positive electrode active material is a sodium ion positive electrode active material, the electrolyte salt is selected as a sodium ion electrolyte salt.

[0217] By way of example, the lithium ion electrolyte salt may be selected from one or more of lithium hexafluorophosphate (LiPF), lithium tetrafluoroborate (LiBF), lithium perchlorate (LiClO), lithium hexafluoroarsenate (LiAsF), lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium trifluoromethanesulfonate (LiTFS), lithium difluoro(oxalato)borate (LiDFOB), lithium bis(oxalato)borate (LiBOB), lithium difluorophosphate (LiPOF), lithium difluorobis(oxalato)phosphate (LiDFOP), and lithium tetrafluoro(oxalato)phosphate (LiTFOP).

[0218] By way of example, sodium ion electrolyte salts include, but are not limited to, one or more of sodium hexafluorophosphate, sodium difluoro(oxalato)borate, sodium tetrafluoroborate, sodium bis(oxalato)borate, sodium perchlorate, sodium hexafluoroarsenate, sodium bis(fluorosulfonyl)imide, sodium trifluoromethanesulfonate, and sodium bis(trifluoromethylsulfonyl)imide.

[0219] In some embodiments, the solvent is fluoroethylene carbonate (FEC), ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butylene carbonate (BC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propionate The surfactants may be selected from one or more of pyr (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), sulfolane (SF), dimethyl sulfone (MSM), ethyl methyl sulfone (EMS), diethyl sulfone (ESE), ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, crown ether.

[0220] Optionally, the solvent is selected from one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, crown ether.

[0221] The ether-based solvent molecules can establish a stable electrode / electrolyte interface on the surface of the sodium metal negative electrode (including the absence of a negative electrode, the negative electrode design in this application is the absence of a negative electrode), form a stable solid electrolyte interface (SEI), and reduce electrochemical polarization.

[0222] In some embodiments, in the electrolytic solution, the concentration of the electrolyte salt is generally 0.5 mol / L to 8 mol / L, and the concentration of the electrolyte salt is generally 1 mol / L to 4 mol / L.

[0223] In some embodiments, the electrolyte solution optionally further contains additives. For example, the additives may include a negative electrode film-forming additive and a positive electrode film-forming additive, and may further include additives that can improve some battery performance, such as an additive that improves battery overcharge performance, or an additive that improves battery high-temperature or low-temperature performance.

[0224] In some of the embodiments, the battery is a lithium battery, a sodium battery, or a potassium battery.

[0225] Furthermore, the battery is a sodium battery without a negative electrode.

[0226] The present application does not particularly limit the shape of the battery, which may be cylindrical, square, or any other shape. For example, Figure 1 shows a battery 4 with a square structure as an example.

[0227] 2, in some embodiments, the housing may include a case 41 and a cover plate 43. Here, the case 41 may include a bottom plate and a side plate connected to the bottom plate, and the bottom plate and the side plate together form a storage cavity. The case 41 has an opening communicating with the storage cavity, and the cover plate 43 can cover the opening to seal the storage cavity.

[0228] The positive electrode plate, the negative electrode plate, and the separator may be wound or stacked to form an electrode assembly 42. The electrode assembly 42 is packaged in a receiving cavity. An electrolyte is impregnated into the electrode assembly 42. The number of electrode assemblies 42 included in the battery 4 may be one or more, and can be adjusted according to needs.

[0229] The present application further provides a power consuming device including the battery described above.

[0230] Furthermore, in the power consumption device, the battery may be in the form of a battery cell, or may be in the form assembled into a battery pack.

[0231] 3 and 4 show an example of a battery pack 1. The battery pack 1 includes a battery box and one or more batteries 4 installed in the battery box. The battery box includes an upper housing 2 and a lower housing 3, and the upper housing 2 is attached to the lower housing 3 as a lid to form a sealed space for the batteries 4.

[0232] The plurality of batteries 4 may be arranged in the battery box in any manner.

[0233] The battery or a battery pack assembled therewith may be used as a power source for a power consuming device, or as an energy storage unit for a power consuming device.

[0234] The power consuming devices may be, but are 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, satellites, energy storage systems, etc.

[0235] 5 shows an example of a power consumption device 5. The power consumption device 5 may be a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, etc. To meet the demand for high output and high energy density of the secondary battery of the power consumption device 5, a battery pack format may be adopted.

[0236] Other examples of power consuming devices include mobile phones, tablet computers, laptops, etc. These devices are generally required to be thin and may employ batteries as their power source.

[0237] The present application will be described below in conjunction with specific examples, but the present application is not limited to the following examples. It should be understood that the appended claims outline the scope of the present application, and those skilled in the art, guided by the concept of the present invention, should recognize that certain modifications made to each example of the present application are all covered by the spirit and scope of the claims of the present application.

[0238] The following is a specific example. [Example]

[0239] Example 1 S1, sodium battery manufacturing (1) Manufacturing of positive electrode plates The polyvinylidene fluoride adhesive was thoroughly dissolved in N-methylpyrrolidone, and a silicon compound, a carbon black conductive agent, and a positive electrode active material, Na4Fe3(PO4)2P2O7, were added and uniformly dispersed to prepare an activated slurry. The activated slurry had a solids content of 50% and a viscosity of 8800 mPa·s at 25°C and atmospheric pressure. The mass ratio of the positive electrode active material, conductive agent, polyvinylidene fluoride adhesive, and silicon compound was 80:10:9.5:0.5.

[0240] The active slurry was evenly applied to the surface of an aluminum foil, and then transferred to a vacuum oven for drying: drying at 120°C for 2 h, and the dried electrode plate was roll-pressed and then punched to obtain a positive electrode plate.

[0241] The thickness of the active layer on the positive electrode plate was tested: specifically, the thickness of the positive electrode plate and the current collector was measured using a spiral micrometer, and the difference between the two was calculated to obtain the thickness of the active layer, which was 204 μm.

[0242] Characterization tests were performed on the components in the active layer of the positive electrode plate using an infrared spectrometer. The results showed a characteristic peak of trimethylsilyl (TMS) group, and the proportion of the component was quantified based on the comparative absorption peak intensity of the characteristic peak in the infrared spectrum. The type of silicon compound and its mass fraction H1 in the active layer are shown in Table 1.

[0243] The moisture content in the active layer of the positive electrode plate was measured using a KF-type trace moisture tester. The specific steps were based on the standard GB / T 11133-2015, and the Karl Fischer coulometric titration method was used. The results are shown in Table 1.

[0244] (2) Manufacturing of negative electrode plates The adhesive, carboxymethylcellulose sodium CMC-Na, and the conductive agent, carbon nanotubes, were mixed in a mass ratio of 3:2 and added to water, followed by stirring to form a uniform slurry with a solid content of 2%. The slurry was applied to the surface of copper foil, then transferred to a vacuum oven to dry completely, and then punched out to obtain a negative electrode plate. The thickness of the formed slurry layer was 1.2 μm.

[0245] (3) Electrolyte production In a glove box with an argon gas atmosphere (H2O<0.1 ppm, O2<0.1 ppm), sodium hexafluorophosphate was dissolved in the organic solvent ethylene glycol dimethyl ether and stirred uniformly to obtain an electrolyte solution with a sodium hexafluorophosphate concentration of 1.0 mol / L.

[0246] (4) Separator: A polypropylene film was used as the separator.

[0247] (5) Manufacturing of sodium battery: The positive electrode plate, separator, and negative electrode plate were stacked in this order, and the separator was placed between the positive and negative electrode current collectors to act as an insulator. The above electrolyte was added to assemble the battery into a laminate.

[0248] S2, sodium battery performance test: 1. Coulomb efficiency The obtained sodium battery was charged to 3.7 V at 25°C with a constant current of 1 / 3 C, and then charged at a constant voltage of 3.7 V until the current decreased to 0.05 C to obtain the initial charge capacity (Cc1). It was then discharged to 2.5 V with a constant current of 1 / 3 C to obtain the initial discharge capacity (Cd1), and the coulombic efficiency of the sodium battery was calculated according to the following formula:

[0249] Coulomb efficiency = initial discharge capacity (Cd1) / initial charge capacity (Cc1) x 100%

[0250] 2. Cycle capacity retention rate The sodium battery is charged at 45°C at a constant current of 1C up to 3.7V, then charged at a constant voltage of 3.7V until the current drops to 0.05C, and then discharged at a constant current of 1C down to 2.5V to obtain the discharge capacity Cd1 of the first cycle. This charging and discharging is repeated up to the nth cycle, and the discharge capacity after the sodium battery has completed n cycles is obtained and denoted as Cdn. The capacity retention rate of the sodium battery is calculated according to the following formula: Capacity retention rate Pn = discharge capacity after n cycles (Cdn) / discharge capacity at 1st cycle (Cd1) × 100% The capacity retention rate after 200 cycles is P 200 He wrote:

[0251] 3. Observation of sodium dendrite growth After 200 cycles in the cycle test in step 2 above, the sodium battery was taken and disassembled in an argon gas glove box (H2O<0.1ppm, O2<0.1ppm). The surface morphology of the negative electrode plate was visually observed to determine whether sodium dendrites had formed: if there were no white spots on the negative electrode plate, it was determined that there were no sodium dendrites; if there were sporadic white spots on the negative electrode plate, it was determined that there were slight sodium dendrites; and if there were dense white spots on the negative electrode plate, it was determined that there were serious sodium dendrites.

[0252] 4. After 200 cycles in the cycle test in step 2 above, the sodium battery was taken and disassembled in an argon gas glove box (H2O<0.1ppm, O2<0.1ppm). The negative electrode plate was fabricated into wafers and then disassembled. After disassembly, ICP-MS testing was performed to analyze the content of the transition metal Fe on the negative electrode plate after 200 cycles. This can be considered the amount of transition metal Fe eluted from the positive electrode plate and is designated as F0.

[0253] Examples 2 to 15 Examples 2 to 15 are almost the same as Example 1, with the only difference being that the type of silicon compound or its mass proportion in the active layer in the production of the positive electrode plate in step (1) was different from Example 1. Here, when adjusting the mass proportion of the silicon compound, the mass proportions of the silicon compound and adhesive were adjusted separately, with the total mass proportion of the specific silicon compound and adhesive maintained, thereby making the mass proportion of the silicon compound different from that of Example 1, while the mass proportions of the other components were the same as Example 1. Specific parameters are as shown in Table 1.

[0254] The other step conditions were the same as in Example 1, and the test results were as shown in Table 1.

[0255] Comparative Example 1 Comparative Example 1 is almost the same as Example 1, except that in step (1), no silicon compound is added in the production of the positive electrode plate, and the mass ratio of the positive electrode active material, conductive agent, and polyvinylidene fluoride adhesive is 80:10:10. The specific parameters are as shown in Table 1.

[0256] The conditions for the other steps were the same as in Example 1, and the test results are as shown in Table 1.

[0257] Comparative Example 2 Comparative Example 2 is almost the same as Comparative Example 1, except that in step (1), the silicon compound is replaced with an equal mass of sodium dodecylbenzenesulfonate. The specific parameters are as shown in Table 1.

[0258] The other step conditions were the same as those in Comparative Example 1, and the test results are shown in Table 1.

[0259] Comparative Example 3 Comparative Example 3 was almost the same as Example 1, with the only difference being that in step (1), in the production of the positive electrode plate, no silicon compound was added, the mass ratio of the positive electrode active material, conductive agent, and polyvinylidene fluoride adhesive was 80:10:10, and at the same time, in the production of the electrolyte solution in step (3), 2% by mass of tris(trimethylsilyl)phosphate ester was added to the electrolyte solution.

[0260] The relevant parameters and performance results for each example and comparative example are shown in Table 1. Here, the mass ratio of the silicon compound in the active layer is denoted as H1, and the amount of eluted transition metal Fe in the positive electrode plate is denoted as F0.

[0261] [Table 1A] [Table 1B]

[0262] As can be seen from the data in Analysis Table 1, comparing the results of Example 1 and Comparative Examples 1 and 2, the electrode plate of the present application can improve the stability of the battery by adding a silicon compound containing a specific group to the electrode film layer, thereby improving the coulombic efficiency and cycle performance of the battery. Furthermore, when the silicon compound further contains a phosphate ester group, the elution of transition metals such as iron in the electrode plate can be significantly suppressed, further improving the cycle performance of the battery.

[0263] Furthermore, as can be seen from the comparison of the results of Example 1 and Comparative Example 3, by adopting the technical solution of the present application and adding a silicon compound containing a specific group to the electrode film layer, it is possible to simultaneously achieve the effects of water removal and effective inhibition of metal elution. The silicon compound only performs a simple water removal function in the electrolyte.

[0264] Research has shown that the reason for this phenomenon may be as follows: the phosphate or phosphinate groups on the electrode surface can react with oxidizing substances generated during the battery's charge and discharge process, reducing parasitic oxidation currents, inhibiting the decomposition of the oxidizing substances on the electrode material, and enhancing the composition stability of the electrode plate during charge and discharge. However, because the probability of contact with oxidizing substances generated during the charge and discharge process in the electrolyte is extremely low, it is generally not possible to effectively prevent metal leaching.

[0265] The technical features of the embodiments described above can be combined in any combination. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction between the combinations of these technical features, they should all be considered within the scope of the present specification.

[0266] The above examples only show some embodiments of the present application, and the descriptions are specific and detailed, but should not be understood as limiting the scope of the claims. It should be noted that those skilled in the art can make further modifications and improvements without departing from the concept of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application should be determined based on the appended claims, and the specification and drawings can be used to interpret the content of the claims. [Explanation of symbols]

[0267] 1: Battery pack 2: Upper housing 3: Lower housing 4:Battery 41: Case 42: Electrode assembly 43: Cover plate 5: Power consumption device.

Claims

1. An electrode plate, the electrode plate includes a current collector and an electrode film layer provided on a surface of the current collector, a component of the electrode film layer includes a silicon compound; The silicon compound has a group represented by formula (A): 【Chemistry 1】 In formula (A), each R １ are each independently selected from any one of hydrogen, a substituted or unsubstituted alkyl group, an alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and each R １ is not simultaneously hydrogen, "*" represents a bonding site between the group represented by formula (A) and another structure in the silicon compound, electrode plate.

2. Each R １ are each independently selected from any one of hydrogen, a substituted or unsubstituted open-chain alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted open-chain alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms; Optionally, each R １ are each independently selected from any one of hydrogen, an unsubstituted chain alkyl group having 1 to 15 carbon atoms, a chain alkyl group substituted with a halogen and having 1 to 15 carbon atoms, an unsubstituted cycloalkyl group having 3 to 15 carbon atoms, a cycloalkyl group substituted with a halogen and having 3 to 15 carbon atoms, a chain alkoxy group having 1 to 15 carbon atoms, a substituted or unsubstituted aryl group having 6 to 20 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 20 ring atoms, an alkenyl group having 2 to 15 carbon atoms, and an alkynyl group having 2 to 15 carbon atoms.

3. The silicon compound further contains a D group, and the D group is selected from at least one group of a borate ester group, a phosphate ester group, a phosphinate ester group, a sulfonate ester group, and an amine group; Alternatively, the D group is selected from at least one group of a borate ester group, a phosphate ester group, and a phosphinate ester group, and the D group and the group represented by formula (A) are bonded via an oxygen atom; Optionally, the D group is an amine group, and the D group and the group represented by formula (A) are bonded via a nitrogen atom.

4. The silicon compound includes at least one of formulas (1) to (5): 【Chemistry 2】 In formulas (1) to (5), G is selected from boron or phosphorus; Each L １ are each independently a halogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT １ and at least one L １ Ha, -OT １ and T １ is selected from any one of hydrogen, a group represented by formula (A), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and at least one T １ is a group represented by formula (A), Each L ２ are each independently a halogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT ２ and at least one L ２ Ha, -OT ２ and T ２ is selected from any one of hydrogen, a group represented by formula (A), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and at least one T ２ is a group represented by formula (A), Y is selected from a single bond or oxygen; L ３ are each independently a halogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT ３ and at least one L ３ Ha, -OT ３ and T ３ is selected from any one of hydrogen, a group represented by formula (A), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and at least one T ３ is a group represented by formula (A), Each L ４ are each independently selected from any one of hydrogen, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, and a group represented by formula (A), and at least one L ４ is a group represented by formula (A), Each L ５ are each independently a halogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 50 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, an alkenyl group having 2 to 30 carbon atoms, an alkynyl group having 2 to 30 carbon atoms, a group represented by formula (A), and -OT ５ and at least one L ５ Ha, -OT ４ and T ４ is selected from any one of hydrogen, a group represented by formula (A), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group, and at least one T ４ The electrode plate according to claim 1 , wherein: is a group represented by formula (A).

5. The silicon compound satisfies any one of the following conditions (1) to (5): (1) At least two L １ Ha, -OT １ is selected from Optionally, T １ is selected from any one of hydrogen, a group represented by the formula (A), an unsubstituted chain alkyl group having 1 to 30 carbon atoms, a halogen-substituted chain alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms, Further optionally, at least two T １ is selected from the group represented by formula (A), (2) At least two L ２ Ha, -OT ２ is selected from Optionally, T ２ is selected from any one of hydrogen, a group represented by the formula (A), an unsubstituted chain alkyl group having 1 to 30 carbon atoms, a halogen-substituted chain alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms, Further optionally, at least two T ２ is selected from the group represented by formula (A), (3) At least two L ３ Ha, -OT ３ is selected from Optionally, T ３ is selected from any one of hydrogen, a group represented by the formula (A), an unsubstituted chain alkyl group having 1 to 30 carbon atoms, a halogen-substituted chain alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms, Further optionally, at least two T ３ is selected from the group represented by formula (A), (4) Each L ４ are each independently selected from any one of hydrogen, an unsubstituted linear alkyl group having 1 to 30 carbon atoms, a linear alkyl group substituted with a halogen and having 1 to 30 carbon atoms, an unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a cycloalkyl group substituted with a halogen and having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 15 carbon atoms, an alkynyl group having 2 to 15 carbon atoms, and a group represented by formula (A), Optionally, at least two L ４ is selected from the group represented by formula (A), (5) At least two L ５ Ha, -OT ５ is selected from Optionally, T ４ is selected from any one of hydrogen, a group represented by the formula (A), an unsubstituted chain alkyl group having 1 to 30 carbon atoms, a halogen-substituted chain alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, an alkenyl group having 2 to 30 carbon atoms, and an alkynyl group having 2 to 30 carbon atoms, Further optionally, at least two T ４ The electrode plate according to claim 4 , wherein is selected from the group represented by formula (A).

6. The silicon compound includes at least one of formulas (1) to (3), Optionally, G is phosphorus.

7. 4. The electrode plate according to claim 1, wherein the silicon compound comprises at least one of tris(trimethylsilyl)borate ester, tris(trimethylsilyl)phosphate ester, tris(trimethylsilyl)phosphite ester, bis(trimethylsilyl)difluorobisphosphate, tetrakis(trimethylsilyl)pyrophosphate, bis(trimethylsilyl)pyromonofluorophosphate ester, bis(trimethylsilyl)fluorophosphite, (trimethylsilyl)difluorophosphate ester, hexamethyldisilazane, bistrimethylsilylated vinylphosphate ester, tris(vinyldimethylsilane)phosphate ester, tris(phenyldimethylsilane)phosphate ester, trimethylsilylmethanesulfonate ester, heptamethyldisilazane, and ethylhexamethyldisilazane.

8. the silicon compound comprises at least one of tris(trimethylsilyl) phosphite, tris(trimethylsilyl) phosphate, bis(trimethylsilyl) fluorophosphite, tris(trimethylsilyl) borate, hexamethyldisilazane, bis(trimethylsilyl) difluorobisphosphate, tetrakis(trimethylsilyl) pyrophosphate, bistrimethylsilylated vinyl phosphate, tris(vinyldimethylsilane) phosphate, tris(phenyldimethylsilane) phosphate, and trimethylsilyl methanesulfonate; Optionally, the silicon compound includes at least one of tris(trimethylsilyl) phosphite, tris(trimethylsilyl) phosphate, bis(trimethylsilyl) fluorophosphite, bis(trimethylsilyl) difluorobisphosphate, tetrakis(trimethylsilyl) pyrophosphate, bistrimethylsilylated vinyl phosphate, tris(vinyldimethylsilane) phosphate, and tris(phenyldimethylsilane) phosphate.

9. In the electrode film layer, the mass ratio of the silicon compound is 0.1% to 1.2%; Optionally, the mass ratio of the silicon compound is 0.2% to 1%.

10. The components of the electrode film layer further include a positive electrode active material, and the positive electrode active material is (1) The positive electrode active material includes any one of a positive electrode active material for a lithium ion battery, a positive electrode active material for a sodium ion battery, and a positive electrode active material for a potassium ion battery; (2) The positive electrode active material contains a transition metal element, and optionally, the transition metal element contains an iron element; (3) In the electrode film layer, the mass ratio of the positive electrode active material is 70% to 99.8%. The electrode plate according to claim 1 , wherein any one of the above conditions is satisfied.

11. The electrode plate according to claim 10 , wherein the positive electrode active material is a positive electrode active material for a sodium ion battery.

12. The positive electrode active material is NaFePO ４ , Na ３ V ２ (P.O. ４ ) ３ , Na ４ Fe ３ (P.O. ４ ) ２ (P ２ O ７ ), NaMPO ４ F, Na ａ M2 ｂ M3 ｃ (CN) ６ And Na ３ (VO ｙ ) ２ (P.O. ４ ) ２ F （３－２ｙ） and wherein M2 and M3 are each independently selected from at least one of Ni, Cu, Fe, Mn, Co, and Zn, and 0<a≦2, 0<b<1, and 0<c<1; and M1 is selected from at least one of V, Fe, Mn, and Ni, and 0≦y≦1.

11. The electrode plate of claim 10.

13. The components of the electrode film layer further include a conductive agent and an adhesive; Optionally, in the electrode film layer, the mass ratio of the conductive agent is 1% to 20%; Optionally, the mass ratio of the adhesive in the electrode film layer is 1% to 10%.

14. The water content of the electrode membrane layer is ≦400 ppm; Optionally, the electrode plate according to any one of claims 1 to 3, wherein the water content of the electrode membrane layer is ≦350 ppm.

15. The method includes applying the membrane layer slurry to a surface of a current collector to form an electrode membrane layer, thereby manufacturing an electrode plate; The method for manufacturing an electrode plate according to claim 1 , wherein components of the membrane layer slurry include the silicon compound.

16. A battery comprising the electrode plate according to any one of claims 1 to 14.

17. 17. A power consuming device comprising the battery of claim 16.

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