Insulating composition for rechargeable lithium battery, electrode manufactured using same, and rechargeable lithium battery

Abstract

An insulating composition for a rechargeable lithium battery, an electrode manufactured using the same, and a rechargeable lithium battery are provided. An insulating composition for a rechargeable lithium battery includes a binder including a cross-linked polymer of a first polymer and a second polymer, inorganic particles, and a solvent. The first polymer includes a first backbone and a first pendant group, and the second polymer includes an amine group.

Description

Technical Field

[0001] An insulating composition for a rechargeable lithium battery, an electrode made using the insulating composition, and a rechargeable lithium battery are disclosed. Background Technology

[0002] Rechargeable lithium-ion batteries can be recharged, and their energy density per unit weight is three times or more higher than that of conventional lead-acid, nickel-cadmium, nickel-metal hydride, and nickel-zinc batteries. Rechargeable lithium-ion batteries can also be charged at high rates, making them commercially available for applications such as laptops, cell phones, power tools, and electric bicycles. Improving the additional energy density of rechargeable lithium-ion batteries can be advantageous.

[0003] Rechargeable lithium batteries are typically manufactured by injecting an electrolyte into an electrode assembly, which includes a positive electrode and a negative electrode. The positive electrode includes a positive electrode active material capable of inserting / deintercalating lithium ions, and the negative electrode includes a negative electrode active material capable of inserting / deintercalating lithium ions.

[0004] Typically, the width of the negative electrode is wider than that of the positive electrode, and a diaphragm is placed between the positive and negative electrodes. Here, burrs formed at the edge of the positive electrode coating area may come into contact with the negative electrode and may cause a short circuit between the positive and negative electrodes, or may cause a drop in OCV (open circuit voltage).

[0005] To address this problem, a method is known for coating an uncoated area of ​​a positive electrode with an insulating composition comprising inorganic particles. Polyvinylidene fluoride (PVdF) and styrene-butadiene rubber (SBR) are known adhesives that adhere the aforementioned inorganic particles to the uncoated area of ​​the positive electrode while also adhering to different inorganic particles.

[0006] However, when the PVdF binder absorbs the electrolyte inside the rechargeable lithium battery and swells after being coated on the uncoated area of ​​the positive electrode, the PVdF binder loses its adhesive strength, and although the SBR binder has good adhesive strength after coating, the viscosity of the SBR binder suddenly drops during the coating process. Summary of the Invention

[0007] Some example embodiments include an insulating composition for rechargeable lithium batteries that maintains desired or improved adhesive strength within the rechargeable lithium battery after coating, even without the use of SBR adhesives.

[0008] Some example embodiments include an insulating composition for a rechargeable lithium battery, the insulating composition comprising: a binder, a crosslinked polymer comprising a first polymer and a second polymer; inorganic particles; and a solvent. The first polymer comprises a first main chain and first side groups, the first side groups being represented by chemical formula 1, and the second polymer comprises amino groups. Chemical Formula 1: -L 1 -L 2 -X.

[0009] In Chemical Formula 1, the definition of each symbol follows a detailed description.

[0010] Some example embodiments include an electrode for a rechargeable lithium battery made using an insulating composition according to the foregoing example embodiments.

[0011] Some example embodiments include a rechargeable lithium battery, wherein at least one of the positive electrode and the negative electrode is an electrode according to the foregoing example embodiments.

[0012] Even without the use of SBR adhesive, the insulating composition for rechargeable lithium batteries according to the foregoing example embodiments can maintain the desired or improved adhesive strength within the rechargeable lithium battery after coating.

[0013] Therefore, the electrodes and rechargeable lithium batteries manufactured using the insulating composition for rechargeable lithium batteries according to the above example embodiments can exhibit desired or improved cycle life characteristics. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an insulating composition for a rechargeable lithium battery according to some example embodiments and an insulating layer formed by coating the insulating composition.

[0015] Figure 2 This is a schematic diagram illustrating electrodes for a rechargeable lithium battery according to some example embodiments.

[0016] Figures 3 to 6 This is a schematic diagram illustrating a rechargeable lithium battery according to some example embodiments. Detailed Implementation

[0017] Hereinafter, exemplary embodiments of the present disclosure are described in detail. However, these embodiments are examples, and the present disclosure is not limited thereto, and is defined by the scope of the claims.

[0018] As used herein, unless otherwise specifically defined, it is understood that when an element such as a layer, film, region, or substrate is referred to as being “on” another element, the element may be directly on the other element, or there may be an intervening element.

[0019] As used herein, the singular may also include the plural unless otherwise specifically defined. Additionally, unless otherwise stated, “A or B” may mean “including A, including B, or including both A and B”.

[0020] As used herein, “combination of them” can mean a mixture, stack, complex, copolymer, alloy, blend or reaction product of the components.

[0021] As used herein, unless otherwise specifically defined, “substitution” means that at least one hydrogen atom of a compound is substituted by a halogen atom (F, Cl, Br or I), a hydroxyl group, a C1 to C20 alkoxy group, a nitro group, a cyano group, an amino group, an imino group, an azide group, an amido group, a hydrazine group, a hydrazone group, a carbonyl group, a carbamoyl group, a thiol group, an ester group, an ether group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C1 to C20 alkyl group, a C2 to C20 alkenyl group, a C2 to C20 alkynyl group, a C6 to C30 aryl group, a C3 to C20 cycloalkyl group, a C3 to C20 cycloalkenyl group, a C3 to C20 cycloalkynyl group, a C2 to C20 heterocyclic alkyl group, a C2 to C20 heterocyclic alkenyl group, a C2 to C20 heterocyclic alkynyl group, or a combination thereof.

[0022] As used herein, unless otherwise specifically defined, “heterocyclic alkyl,” “heterocyclic alkenyl,” “heterocyclic alkynyl,” and “hemiecyclic alkylene” mean the presence of at least one N, O, S, or P in a cyclic compound of cycloalkyl, cycloalkenyl, cycloalkynyl, and heterocyclic alkylene.

[0023] In the chemical formulas of this disclosure, unless otherwise specifically defined, hydrogen bonds are depicted at the locations where chemical bonds should be shown.

[0024] As used herein, unless otherwise defined, particle size can be the average particle size. Alternatively, particle size can refer to the average particle size (D50), representing the diameter of particles having a cumulative volume of 50% in a particle size distribution. The average particle size (D50) can be measured by methods known to those skilled in the art, for example, by a particle size analyzer or by transmission electron microscopy or scanning electron microscopy images. Optionally, data analysis is performed using a dynamic light scattering measurement device to count the number of particles in each particle size range. Thus, the average particle size (D50) value can be readily obtained by calculation. Optionally, the average particle size (D50) value can be measured using laser diffraction. When measured by laser diffraction, for example, the particles to be measured are dispersed in a dispersion medium, then introduced into a commercially available laser diffraction particle size measuring device (e.g., Microtrac MT3000), and ultrasonic waves at approximately 28 kHz are irradiated with a 60 W output to calculate the average particle size (D50) based on a 50% particle size distribution in the measuring device.

[0025] As used herein, “average particle size” for an adhesive means volume average particle size and Z-average particle size as measured using a dynamic light scattering analysis apparatus.

[0026] When the terms “about” or “substantially” are used in conjunction with numerical values ​​in this specification, it means that the relevant numerical value includes a tolerance of ±10% around the stated value. When a range is specified, the range includes all values ​​within that range, such as increments of 0.1%.

[0027] Insulating composition for rechargeable lithium batteries Some example embodiments include an insulating composition for a rechargeable lithium battery, the insulating composition comprising: a binder, a crosslinked polymer comprising a first polymer and a second polymer; inorganic particles; and a solvent. The first polymer comprises a first main chain and first side groups, the first side groups being represented by the following chemical formula 1, and the second polymer comprises amino groups: Chemical Formula 1: -L 1 -L 2 -X.

[0028] A first polymer comprising a first side group represented by chemical formula 1 and a second polymer comprising an amine group can be crosslinked by an SN2 reaction, and the crosslinked polymer of the first polymer and the second polymer formed thereby has an intramolecular crosslinked structure and thus has desired or improved adhesive strength and stability.

[0029] SN2 reactions are reactions that can occur easily by heating alone and can form cross-linked polymers during the solvent drying process after coating the insulating composition, without the need for separate initiators or additional processes.

[0030] Therefore, the insulating composition for rechargeable lithium batteries according to the foregoing example embodiments includes a crosslinked polymer of the first polymer and the second polymer as a binder, so that the desired or improved adhesive strength can be maintained within the coated rechargeable lithium battery even without the use of SBR binder.

[0031] The insulating composition for a rechargeable lithium battery according to the foregoing example embodiments is described in detail below.

[0032] Cross-linked polymer (first adhesive) The crosslinked polymer of the first polymer and the second polymer may be referred to as the "first binder" to distinguish the crosslinked polymer from the second binder described below.

[0033] The first polymer includes a first main chain and a first side group, and the first side group is represented by chemical formula 1.

[0034] The description of chemical formula 1 is as follows.

[0035] It is the part that connects to the first main chain.

[0036] L 1 It can be a single bond, a substituted or unsubstituted cycloalkylene group having 3 to 30 carbon atoms, a substituted or unsubstituted heteroalkylene group having 2 to 30 carbon atoms, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 30 carbon atoms.

[0037] For example, L 1 It can be a single bond or a phenylene oxide.

[0038] L 2 It can be a single bond, an alkylene group with one or two carbon atoms, or an alkenyl group with two carbon atoms.

[0039] For example, L 2 It can be a single bond or a methylene group.

[0040] X can be or include at least one of F, Cl, Br and I.

[0041] For example, X could be Cl.

[0042] Chemical formula 1 can be represented by any one of chemical formulas 1-1 to 1-3: Chemical formula 1-1:

[0043] Chemical formulas 1-2:

[0044] Chemical formulas 1-3: .

[0045] The first main chain may be or include polyethylene or polysulfone.

[0046] The first polymer may include a first repeating unit, and the first repeating unit may be represented by any one of the chemical formulas A1 to A3: Chemical formula A1:

[0047] Chemical formula A2:

[0048] Chemical formula A3: .

[0049] The weight-average molecular weight of the first polymer, as measured by gel permeation chromatography (GPC), can be in the range of about 20,000 g / mol to about 300,000 g / mol or about 100,000 g / mol to about 200,000 g / mol.

[0050] The second polymer may include a second main chain comprising only amine groups, or may include a second main chain excluding amine groups and a second side chain comprising amine groups.

[0051] The second side group, including the amino group, can be represented by chemical formula 2: Chemical formula 2: -L 3 -Y.

[0052] The description of chemical formula 2 is as follows.

[0053] It is the part that connects to the second main chain.

[0054] L 3 It can be a single bond, a substituted or unsubstituted cycloalkylene group having 3 to 30 carbon atoms, a substituted or unsubstituted heteroalkylene group having 2 to 30 carbon atoms, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 30 carbon atoms.

[0055] For example, L 3 It can be a single bond or a phenylene oxide.

[0056] Y can be -NH2, pyridinyl, or 2-pyrrolidone.

[0057] Chemical formula 2 can be represented by any one of chemical formulas 2-1 to 2-4: Chemical formula 2-1:

[0058] Chemical formula 2-2:

[0059] Chemical formula 2-3:

[0060] Chemical formula 2-4: .

[0061] The second main chain, which does not include amine groups, can be polyethylene; and the second main chain, which includes amine groups, can be polyethyleneimine.

[0062] The second polymer may include a second repeating unit; and the second repeating unit may be represented by any one of chemical formulas B1 to B5: Chemical formula B1:

[0063] Chemical formula B2:

[0064] Chemical formula B3:

[0065] Chemical formula B4:

[0066] Chemical formula B5: .

[0067] The weight-average molecular weight of the second polymer, as measured by gel permeation chromatography (GPC), can be in the range of about 20,000 g / mol to about 300,000 g / mol or about 100,000 g / mol to about 200,000 g / mol.

[0068] Second adhesive The crosslinked polymer of the first polymer and the second polymer may be or include the first binder, and polyvinylidene fluoride may be or include the second binder.

[0069] As a second binder, polyvinylidene fluoride may be or include particulate binders and may have a Z-average particle size in the range of about 100 nm to about 600 nm, as measured using a dynamic light scattering analysis device.

[0070] The adhesive described above may consist solely of the first adhesive, or may consist of a mixture of the first and second adhesives, or include a mixture of the first and second adhesives. In any of the above cases, SBR adhesives are excluded.

[0071] When the adhesive is composed of or includes a mixture of a first adhesive and a second adhesive, the weight ratio of the first adhesive to the second adhesive may be in the range of about 8:2 to about 2:8 or about 7:3 to about 3:7.

[0072] Within the aforementioned range, the effects of the first and second adhesives can be coordinated to achieve optimal results.

[0073] Inorganic particles Inorganic particles may be, but are not limited to, at least one of Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite, and combinations thereof.

[0074] The average particle size (D50) of inorganic particles can range from about 0.01 μm to about 100 μm, but is not limited thereto.

[0075] solvent The solvent may be, or include, at least one of methylpyrrolidone, dimethylformamide, and combinations thereof, but is not limited thereto.

[0076] Mixture of components Based on the total amount of 100 wt% of the composition for the insulating layer (i.e., the insulating composition), the binder may be included in an amount ranging from about 1 wt% to about 70 wt%; inorganic particles may be included in an amount ranging from about 1 wt% to about 99 wt%; and the balance may include solvent.

[0077] The weight ratio of binder to inorganic particles can be in the range of about 1:99 to about 99:1, about 5:95 to about 95:5, or about 10:90 to about 90:10.

[0078] When the above range is met, the adhesive strength of the adhesive and the insulating strength of the inorganic particles can be coordinated, and the inorganic particles can be dispersed in the solvent.

[0079] Physical properties of the composition The desired or improved physical properties exhibited by the compositions used in the insulating layer are as follows.

[0080] At a temperature of approximately 25°C, for approximately 10 seconds -1 At a certain shear rate, the insulating composition can have a viscosity in the range of about 500 mPa·s to about 2500 mPa·s (e.g., about 1000 mPa·s to about 2000 mPa·s).

[0081] The insulating composition may have a thixotropic index (TI) value of less than or equal to about 0.5 (e.g., less than or equal to about 0.2), the thixotropic index (TI) value being determined by the reaction of the components at 25°C for 1 second. -1 Viscosity at shear rate divided by viscosity at 10 s -1 The viscosity at the shear rate is then taken as logarithm (log).

[0082] electrode An electrode according to some example embodiments includes: an electrode active material layer; an electrode current collector including a coated region having the electrode active material layer and an uncoated region not having the electrode active material layer; and an insulating layer configured to coat at least a portion of the uncoated region.

[0083] The insulating layer includes a binder comprising a crosslinked polymer comprising a first polymer and a second polymer, and inorganic particles, wherein the first polymer comprises a first main chain and a first side group, the first side group being represented by chemical formula 1, and the second polymer comprises amine groups.

[0084] Figure 1 This is a schematic diagram of an insulating composition for a rechargeable lithium battery according to the foregoing example embodiments and an insulating layer formed by coating the insulating composition.

[0085] When at least a portion of an uncoated area is coated with an insulating composition for a rechargeable lithium battery according to the foregoing example embodiments, the solvent is removed, and an insulating layer comprising an adhesive and inorganic particles can be formed.

[0086] Therefore, the same description can be applied to the electrodes for rechargeable lithium batteries according to the foregoing example embodiments, except for the term "solvent" in the foregoing example embodiments.

[0087] The electrodes for rechargeable lithium batteries according to the foregoing example embodiments are described in detail below, excluding any descriptions that are repeated from the foregoing description.

[0088] Structure of the insulating layer Figure 2 This is a schematic diagram illustrating an electrode for a rechargeable lithium battery according to the foregoing example embodiment.

[0089] like Figure 2As shown, the insulating layer can simultaneously or concurrently cover the burrs and a portion of the uncoated areas formed at the edges of the electrode active material layer.

[0090] Alternatively, an insulating layer may also exist between the burr and the current collector.

[0091] By forming an insulating layer with this structure, it is possible to effectively prevent or avoid burrs formed at the edge of the positive electrode (positive electrode) coating area from contacting the negative electrode (negative electrode).

[0092] Insulation layer thickness The thickness of the insulating layer can be greater than the thickness of the burrs formed at the edge of the positive electrode coating area.

[0093] For example, the thickness of the insulating layer can be from about 5 μm to about 100 μm. Within this range, burrs formed at the edge of the positive electrode coating area can be effectively prevented from contacting the negative electrode.

[0094] Electrodes including insulating layers The electrode for a rechargeable lithium battery according to the foregoing example embodiments can be a positive electrode.

[0095] Physical properties of electrodes including insulating layers The desired or improved physical properties exhibited by the insulation layer are as follows.

[0096] The crosslinking density, expressed as the weight ratio of the crosslinked polymer based on the total weight of 100 wt% of the insulation layer, can be greater than about 0%, greater than or equal to about 10%, or greater than or equal to about 20%.

[0097] Based on the total area of ​​the insulating layer being 100%, after immersing the electrode in the electrolyte for 24 hours, the area of ​​the insulating layer detached from the electrode can be less than or equal to about 20% of the area, less than or equal to about 10% of the area, or about 0% of the area.

[0098] Based on the total length of the insulation layer being 100%, after immersing the electrode in the electrolyte and keeping it at room temperature for 24 hours, the change in the length of the insulation layer can be less than or equal to about 10% of the length, less than or equal to about 5% of the length, or about 0%.

[0099] The electrolyte can be a mixture of approximately 1.5 M lithium salt (LiPF6) in a carbonate solvent, wherein ethylene carbonate (EC): ethyl methyl carbonate (EMC): dimethyl carbonate (DMC) are mixed in a volume ratio of approximately 20:40:40.

[0100] Rechargeable lithium batteries: A rechargeable lithium battery according to some example embodiments includes: a positive electrode; a negative electrode; a separator between the positive electrode and the negative electrode; and an electrolyte, wherein at least one of the positive electrode and the negative electrode is or includes an electrode according to the foregoing example embodiments.

[0101] Therefore, electrodes and rechargeable lithium batteries manufactured using the insulating composition for rechargeable lithium batteries according to the foregoing example embodiments can exhibit desired or improved cycle life characteristics.

[0102] The following describes in detail some example embodiments of rechargeable lithium batteries, excluding repeated descriptions.

[0103] Battery cycle life characteristics Rechargeable lithium batteries may have a cycle life characteristic of greater than or equal to about 60%, greater than or equal to about 80%, or greater than or equal to about 90%. The cycle life characteristic is expressed as the ratio of the discharge capacity of the 500th cycle to the discharge capacity of the 1st cycle after 500 charge / discharge cycles at a rate of about 0.5C within a voltage range of about 2.0V to about 4.0V at a temperature of about 25°C.

[0104] Positive electrode active material The positive electrode active material can be or includes compounds capable of intercalating and deintercalating lithium (lithiation intercalation compounds). For example, one or more types of composite oxides of lithium and metals (such as or including at least one of cobalt, manganese, nickel and combinations thereof) can be used.

[0105] The composite oxide can be or includes lithium transition metal composite oxides, and examples of such composite oxides can include at least one of lithium nickel oxides, lithium cobalt oxides, lithium manganese oxides, lithium iron phosphate compounds, cobalt-free lithium nickel manganese oxides, and combinations thereof.

[0106] As an example, a compound represented by any of the following chemical formulas can be used. Li a A 1-b X b O 2-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Mn 2-b X b O 4-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Ni 1-b-c Co b X c O 2-α Dα (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni 1-b- c Mn b X c O 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni b Co c L 1 d G e O2 (0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.1); Li a NiG b O2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a CoG b O2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-b G b O2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn2G b O4 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-g G g PO4 (0.90≤a≤1.8, 0≤g≤0.5); Li (3-f) Fe2(PO4)3 (0≤f≤2); and Li a FePO4 (0.90≤a≤1.8).

[0107] In the above chemical formulas, A is or includes at least one of Ni, Co, Mn, and combinations thereof; X is or includes at least one of Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, rare earth elements, and combinations thereof; D is or includes at least one of O, F, S, P, and combinations thereof; G is or includes at least one of Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, and combinations thereof; and L 1 It is or includes at least one of Mn, Al and combinations thereof.

[0108] The positive electrode active material may be or includes, for example, lithium nickel oxides represented by chemical formula 11, lithium cobalt oxides represented by chemical formula 12, lithium iron phosphate compounds represented by chemical formula 13, cobalt-free lithium nickel manganese oxides represented by chemical formula 14, or combinations thereof.

[0109] Chemical Formula 11: Li a1 Ni x1 M 1 y1 M 2 z1 O 2-b1 X b1 .

[0110] In chemical formula 11, 0.9 ≤ a1 ≤ 1.8, 0.3 ≤ x1 ≤ 1, 0 ≤ y1 ≤ 0.7, 0 ≤ z1 ≤ 0.7, 0.9 ≤ x1 + y1 + z1 ≤ 1.1, 0 ≤ b1 ≤ 0.1, M 1 and M 2 Each is independently one or more of Al, B, Ba, Ca, Ce, Co, Cr, Cu, Fe, Mg, Mn, Mo, Nb, Si, Sn, Sr, Ti, V, W, Y, Zn, and Zr, and X is or includes one or more of F, P, and S.

[0111] In chemical formula 11, 0.6≤x1≤1, 0≤y1≤0.4, 0≤z1≤0.4, or 0.8≤x1≤1, 0≤y1≤0.2, 0≤z1≤0.2.

[0112] Chemical formula 12: Li a2 Co x2 M 3 y2 O 2-b2 X b2 .

[0113] In chemical formula 12, 0.9 ≤ a² ≤ 1.8, 0.7 ≤ x² ≤ 1, 0 ≤ y² ≤ 0.3, 0.9 ≤ x² + y² ≤ 1.1, 0 ≤ b² ≤ 0.1, M 3 X is or includes one or more of Al, B, Ba, Ca, Ce, Cr, Cu, Fe, Mg, Mn, Mo, Ni, Se, Si, Sn, Sr, Ti, V, W, Y, Zn, and Zr, and X is or includes one or more of F, P, and S.

[0114] Chemical formula 13: Li a3 Fe x3 M 4 y3 PO4-b3 X b3 .

[0115] In chemical formula 13, 0.9 ≤ a³ ≤ 1.8, 0.6 ≤ x³ ≤ 1, 0 ≤ y³ ≤ 0.4, 0 ≤ b³ ≤ 0.1, M 4 X is or includes one or more of Al, B, Ba, Ca, Ce, Co, Cr, Cu, Mg, Mn, Mo, Ni, Se, Si, Sn, Sr, Ti, V, W, Y, Zn, and Zr, and X is or includes one or more of F, P, and S.

[0116] Chemical formula 14: Li a4 Ni x4 Mn y4 M 5 z4 O 2-b4 X b4 .

[0117] In chemical formula 14, 0.9 ≤ a⁴ ≤ 1.8, 0.8 ≤ x⁴ < 1, 0 <y4≤0.2,0≤z4≤0.2,0.9≤x4+y4+z4≤1.1,0≤b4≤0.1,M 5 X is or includes one or more of Al, B, Ba, Ca, Ce, Cr, Fe, Mg, Mo, Nb, Si, Sn, Sr, Ti, V, W, Y, Zn, and Zr, and X is or includes one or more of F, P, and S.

[0118] For example, the positive electrode active material can be or includes a high-nickel positive electrode active material, in which, based on 100 mol% of the metals other than lithium in the lithium transition metal composite oxide, the nickel content is greater than or equal to about 80 mol%, greater than or equal to about 85 mol%, greater than or equal to about 90 mol%, greater than or equal to about 91%, or greater than or equal to about 94 mol% and less than or equal to about 99 mol%. High-nickel positive electrode active materials can achieve high capacity and can be applied to high-capacity, high-density rechargeable lithium batteries.

[0119] positive electrode The positive electrode for a rechargeable lithium battery may include a current collector and a layer of positive electrode active material on the current collector. The positive electrode may be manufactured using an insulating composition for a rechargeable lithium battery according to the foregoing example embodiments.

[0120] The positive electrode active material layer may include the positive electrode active material, and may also include a binder and / or a conductive material.

[0121] For example, the positive electrode may also include additives that can constitute a sacrificial positive electrode.

[0122] Based on a 100wt% positive electrode active material layer, the amount of positive electrode active material can be in the range of about 90wt% to about 99.5wt%, and based on a 100wt% positive electrode active material layer, the amount of binder and conductive material can be in the range of about 0.5wt% to about 5wt%.

[0123] The binder is configured to improve the adhesion properties between the positive electrode active material particles and the adhesion properties between the positive electrode active material particles and the current collector. Examples of binders may include, but are not limited to, at least one of the following: polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide-containing polymers, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, epoxy resin, (meth)acrylate resin, polyester resin, and nylon.

[0124] Conductive materials are included to provide electrode conductivity, and any conductive material can be used as a conductive material unless it causes a chemical change. Examples of conductive materials may include: carbon-based materials, such as at least one of natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, carbon nanotube, etc.; metallic materials such as metal powders or metal fibers, including at least one of copper, nickel, aluminum, silver, etc.; conductive polymers, such as polyphenylene derivatives; or mixtures thereof.

[0125] Negative electrode active material The negative electrode active material may include at least one of the following: materials capable of reversibly inserting / deintercalating lithium ions, lithium metal, lithium metal alloys, materials capable of doping / dedoping lithium, and transition metal oxides.

[0126] Materials that can reversibly insert / deintercalate lithium ions can include, for example, crystalline carbon, amorphous carbon, or combinations thereof as carbon-based negative electrode active materials. Crystalline carbon can be irregular or sheet-like, flake-like, spherical, or fibrous natural or artificial graphite. Amorphous carbon can be or includes at least one of soft carbon, hard carbon, mesophase pitch carbonization products, calcined coke, etc.

[0127] Lithium metal alloys include alloys of lithium and metals (such as or including at least one of Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al and Sn).

[0128] The material capable of doping / dedoping lithium can be or include Si-based negative electrode active materials or Sn-based negative electrode active materials. The Si-based negative electrode active materials can include silicon, silicon-carbon composites, SiO x (0 < x ≤ 2), Si-Q alloys (where Q is an element such as or including at least one of alkali metals, alkaline earth metals, group 13 elements, group 14 elements (excluding Si), group 15 elements, group 16 elements, transition metals, rare earth elements, and combinations thereof), and at least one of their combinations. The Sn-based negative electrode active materials can be or include at least one of Sn, SnO2, Sn-based alloys, and their combinations.

[0129] The silicon-carbon composite can be or include a composite of silicon and amorphous carbon. According to some example embodiments, the silicon-carbon composite can be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles. For example, the silicon-carbon composite can include secondary particles (cores) in which primary silicon particles are assembled and an amorphous carbon coating layer (shells) on the surface of the secondary particles. Amorphous carbon can also be present between the primary silicon particles. For example, the primary silicon particles can be coated with amorphous carbon. The secondary particles can be dispersed in an amorphous carbon matrix.

[0130] The silicon-carbon composite can also include crystalline carbon. For example, the silicon-carbon composite can include a core containing crystalline carbon and silicon particles and an amorphous carbon coating layer on the surface of the core.

[0131] The Si-based negative electrode active materials or the Sn-based negative electrode active materials can be mixed with carbon-based negative electrode active materials.

[0132] negative electrode The negative electrode for a rechargeable lithium battery includes a current collector and a negative electrode active material layer on the current collector. The negative electrode active material layer includes negative electrode active materials and can also include a binder and / or a conductive material.

[0133] For example, the negative electrode active material layer can include about 90 wt% to about 99 wt% of negative electrode active materials, about 0.5 wt% to about 5 wt% of a binder, and about 0.5 wt% to about 5 wt% of a conductive material.

[0134] The binder is configured to adhere the negative electrode active material particles to each other and adhere the negative electrode active materials to the current collector. The binder can be or include a non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof. ]

[0135] The non-aqueous binder can include at least one of polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene-propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamideimide, polyimide, and their combinations.

[0136] Waterborne adhesives may include at least one of the following: styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluororubber, polyethylene oxide, polyvinylpyrrolidone, polyepoxygenated alcohol, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof.

[0137] When an aqueous binder is included as the negative electrode binder, a cellulose-based compound configured to impart viscosity may be further included. As a cellulose-based compound, one or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, and their alkali metal salts may be mixed. The alkali metal may be or include at least one of Na, K, and Li.

[0138] Dry adhesives are or include fibrous polymeric materials and may be or include at least one of, for example, polytetrafluoroethylene, polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, and combinations thereof.

[0139] Conductive materials are included to provide electrode conductivity, and any conductive material may be included as a conductive material unless the conductive material causes an adverse chemical change in the electrode or battery. Examples of conductive materials include: carbon-based materials, such as at least one of natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, carbon nanotube, etc.; metallic materials such as metal powders or metal fibers, including at least one of copper, nickel, aluminum, silver, etc.; conductive polymers, such as polyphenylene derivatives; or mixtures thereof.

[0140] The negative electrode current collector may include at least one of copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, polymer substrate coated with a conductive metal, and combinations thereof.

[0141] electrolyte Electrolytes used in rechargeable lithium batteries include non-aqueous organic solvents and lithium salts.

[0142] Non-aqueous organic solvents are constructed as media for transporting ions that participate in the electrochemical reactions of the battery.

[0143] Non-aqueous organic solvents may be or include at least one of carbonate solvents, ester solvents, ether solvents, ketone solvents, alcohol solvents, aprotic solvents, and combinations thereof.

[0144] Carbonate solvents may include at least one of dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), methyl ethyl carbonate (MEC), ethylene carbonate (EC), propylene carbonate (PC), and butyl carbonate (BC). Esters may include at least one of methyl acetate, ethyl acetate, n-propyl acetate, dimethyl acetate, methyl propionate, ethyl propionate, decanolactone, mevalonolactone, valproic acid lactone, caprolactone, etc. Ether solvents may include at least one of dibutyl ether, tetraethylene glycol dimethyl ether, diethylene glycol dimethyl ether, dimethoxyethane, 2-methyltetrahydrofuran, 2,5-dimethyltetrahydrofuran, tetrahydrofuran, etc. Ketone solvents may include cyclohexanone, etc. Alcohol solvents may include at least one of ethanol, isopropanol, etc. Aprotic solvents may include at least one of the following: nitriles, such as R-CN (wherein R is a C2 to C20 straight chain, branched chain or cyclic chain, and may include hydrocarbon group, double bond, aromatic ring or ether group, etc.); amides, such as dimethylformamide; dioxolane, such as 1,3-dioxolane, 1,4-dioxolane, etc.; sulfolane, etc.

[0145] Non-aqueous organic solvents may be included alone or in a mixture of two or more types of solvents.

[0146] When using carbonate solvents, cyclic carbonates and chain carbonates can be mixed, and the cyclic carbonates and chain carbonates can be mixed in a volume ratio ranging from about 1:1 to about 1:9.

[0147] The electrolyte may also include at least one of ethylene ethyl carbonate, vinylene carbonate, fluoroethylene carbonate, difluoroethylene carbonate, chloroethylene carbonate, dichloroethylene carbonate, bromoethylene carbonate, dibromoethylene carbonate, nitroethylene carbonate, cyanoethylene carbonate, and combinations thereof as an additive.

[0148] Lithium salts dissolved in organic solvents are configured to supply lithium ions in batteries to enable basic operation of rechargeable lithium batteries and improve lithium ion transport between the positive and negative electrodes. Examples of lithium salts may include LiPF6, LiBF4, LiSbF6, LiAsF6, LiClO4, LiAlO2, LiAlCl4, LiPO2F2, LiCl, LiI, LiN(SO3C2F5)2, Li(FSO2)2N (lithium bis(fluorosulfonyl)imide, LiFSI), LiC4F9SO3, LiN(C x F 2x+1 SO2)(C y F 2y+1At least one of the following: (SO2) (where x and y are integers from 1 to 20), lithium trifluoromethanesulfonate, lithium tetrafluoroethanesulfonate, lithium difluoro(oxalate)borate (LiDFOB), lithium difluorobis(oxalate)phosphate (LiDFBOP), and lithium bis(oxalate)borate (LiBOB).

[0149] diaphragm Depending on the type of rechargeable lithium battery, a separator may be present between the positive and negative electrodes. The separator may include at least one of the following: polyethylene, polypropylene, polyvinylidene fluoride, or a multilayer film of two or more layers thereof, and may include mixed multilayer films, such as polyethylene / polypropylene bilayer films, polyethylene / polypropylene / polypropylene trilayer films, polypropylene / polypropylene / polypropylene trilayer films, etc.

[0150] The membrane may include a porous substrate and a coating layer on one or both surfaces of the porous substrate, comprising organic materials, inorganic materials, or combinations thereof.

[0151] The porous substrate may be or include a polymer membrane formed of or comprising any polymer, such as a polyolefin (such as polyethylene and polypropylene), a polyester (such as polyethylene terephthalate and polybutylene terephthalate), a polyacetal, a polyamide, a polyimide, a polycarbonate, a polyetherketone, a polyaryletherketone, a polyetherimide, a polyamideimide, a polybenzimidazole, a polyethersulfone, a polyphenylene ether, a cyclic olefin copolymer, a polyphenylene sulfide, a polyethylene naphthalate, a glass fiber, a TEFLON, and a polytetrafluoroethylene, or a copolymer or mixture of two or more of these polymers.

[0152] Organic materials may include polymers such as vinylidene fluoride or (meth)acrylic acid polymers.

[0153] Inorganic materials may include inorganic particles, such as or including at least one of Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite, and combinations thereof, but are not limited thereto.

[0154] Organic and inorganic materials can be mixed in a coating layer, or a coating layer containing organic materials and a coating layer containing inorganic materials can be stacked together.

[0155] Rechargeable lithium batteries Rechargeable lithium batteries can be classified according to their shape as cylindrical batteries, prismatic batteries, pouch batteries, or coin-shaped batteries, etc. Figures 3 to 6 This is a schematic diagram illustrating a rechargeable lithium battery according to some example embodiments, wherein, Figure 3 It is a cylindrical battery. Figure 4 It is a prismatic battery. Figure 5 and Figure 6 It's a pouch battery. (See reference) Figures 3 to 6 The rechargeable lithium battery 100 includes an electrode assembly 40 and a housing 50. The electrode assembly 40 has a separator 30 disposed between a positive electrode 10 and a negative electrode 20. The electrode assembly 40 is housed within the housing 50. The positive electrode 10, the negative electrode 20, and the separator 30 may be impregnated with an electrolyte (not shown). Figure 3 As shown, the rechargeable lithium battery 100 may include a sealing member 60 of a sealed housing 50. Additionally, in Figure 4 In this context, the rechargeable lithium battery 100 may include a positive electrode lead connector 11, a positive electrode terminal 12 connected to the positive electrode lead connector 11, a negative electrode lead connector 21, and a negative electrode terminal 22 connected to the negative electrode lead connector 21. For example... Figure 5 and Figure 6 As shown, the rechargeable lithium battery 100 includes Figure 6 The electrode terminals 70 shown in the figure or Figure 5 The positive electrode terminal 71 and negative electrode terminal 72 shown in the figure form an electrical path for guiding the current formed in the electrode assembly 40 to the outside of the rechargeable lithium battery 100.

[0156] The rechargeable lithium batteries according to some example embodiments can be used in, for example, automobiles, mobile phones and / or various types of electrical devices, but this disclosure is not limited thereto.

[0157] Examples and comparative examples of this disclosure are described below. However, the following examples are merely examples of this disclosure, and this disclosure is not limited to these examples.

[0158] Example 1 (1) Preparation of the first adhesive and the insulating composition including the first adhesive The first adhesive is prepared at 130°C by forming a cross-linked structure through an SN2 reaction of a polyvinylpyrrolidone polymer including amine groups with polyvinyl chloride including alkyl halides.

[0159] The weight-average molecular weight of polyvinylpyrrolidone polymer and polyvinyl chloride, as measured by GPC, is 200,000 g / mol.

[0160] An insulating composition was prepared by mixing 2 wt% of a first binder, 8 wt% of polyvinylidene fluoride as a second binder having a Z-average particle size of 100 nm as measured by optical scattering analyzer and a weight-average molecular weight of 1,000,000 g / mol as measured by GPC method, 20 wt% of boehmite as inorganic particles having an average particle size (D50) of 2.5 μm, and 70 wt% of NMP as a solvent.

[0161] Here, the weight ratio of the first binder to the second binder is 2:8. Furthermore, the total weight ratio of the first binder to the inorganic particles is 1:2.

[0162] (2) Manufacturing of the positive electrode An aluminum foil with a thickness of 10 μm is used as the positive electrode current collector.

[0163] By using LiNi as the positive electrode active material 0.91 Co 0.05 Al 0.04 O2, polyvinylidene fluoride (PVDF) as a binder, and carbon as a conductive agent were mixed in a weight ratio of 92:4:4, and then the mixture was dispersed in N-methyl-2-pyrrolidone to prepare a positive electrode slurry. The slurry was coated on a 10 μm thick aluminum foil to form a positive electrode active material layer.

[0164] The portion of the positive electrode current collector with a layer of positive electrode active material is called the "positive electrode coated area," and the other portion of the positive electrode current collector without a layer of positive electrode active material is called the "positive electrode uncoated area."

[0165] Subsequently, an insulating composition is coated to a thickness of approximately 10 μm to simultaneously cover the burrs formed at the edge of the positive electrode active material layer and a portion of the uncoated area on the positive electrode current collector, and then dried in an oven at 130°C to manufacture the positive electrode.

[0166] (3) Manufacturing of the negative electrode A negative electrode active material slurry was prepared by mixing artificial graphite and silicon particles in a weight ratio of 93.5:6.5 as the negative electrode active material, then mixing the negative electrode active material, styrene-butadiene rubber binder, and carboxymethyl cellulose in a weight ratio of 97:1:2 and dispersing the mixture in distilled water.

[0167] The negative electrode active material slurry was coated onto a 10 μm thick Cu foil, then dried at 100 °C and pressed to form a negative electrode active material layer.

[0168] (4) Preparation of electrolyte An electrolyte was prepared by mixing 1.5 M lithium salt (LiPF6) with a carbonate solvent comprising ethylene carbonate (EC): ethyl methyl carbonate (EMC): dimethyl carbonate (DMC) in a volume ratio of 20:40:40.

[0169] (5) Manufacturing of rechargeable lithium battery cells The manufactured positive and negative electrodes are assembled to obtain an electrode assembly, which is then inserted into a prismatic housing and an electrolyte is injected therein to manufacture a rechargeable lithium battery cell.

[0170] Example 2 The insulating composition, positive electrode, and rechargeable lithium battery cell of Example 2 were manufactured in the same manner as in Example 1, except that the weight ratio of the first binder to the second binder was changed to 3:7 when the insulating composition was prepared.

[0171] Example 3 The insulating composition, positive electrode, and rechargeable lithium battery cell of Example 3 were manufactured in the same manner as in Example 1, except that the weight ratio of the first binder to the second binder was changed to 5:5 when the insulating composition was prepared.

[0172] Example 4 The insulating composition, positive electrode, and rechargeable lithium battery cell of Example 4 were manufactured in the same manner as in Example 1, except that the weight ratio of the first binder to the second binder was changed to 7:3 when the insulating composition was prepared.

[0173] Example 5 The insulating composition, positive electrode, and rechargeable lithium battery cell of Example 5 were manufactured in the same manner as in Example 1, except that the weight ratio of the first binder to the second binder was changed to 8:2 when the insulating composition was prepared.

[0174] Example 6 The insulating composition, positive electrode, and rechargeable lithium battery cell of Example 6 were manufactured in the same manner as in Example 1, except that only the first binder was used as a binder when preparing the insulating composition.

[0175] Comparison Example 1 The insulating composition, positive electrode, and rechargeable lithium battery cell of Comparative Example 1 were manufactured in the same manner as in Example 1, except that only the second binder was used as a binder when preparing the insulating composition.

[0176] Comparison Example 2 The insulating composition, positive electrode, and rechargeable lithium battery cell of Comparative Example 2 were manufactured in the same manner as in Example 1, except that when preparing the insulating composition, only styrene-butadiene rubber (weight-average molecular weight of 500,000 g / mol as measured by GPC) was used as a binder.

[0177] Comparison Example 3 The insulating composition, positive electrode, and rechargeable lithium battery cell of Comparative Example 3 were manufactured in the same manner as in Example 1, except that when preparing the insulating composition, a second binder and styrene-butadiene rubber (weight-average molecular weight of 500,000 g / mol as measured by GPC) were mixed in a 5:5 weight ratio as a binder.

[0178] Evaluation Example 1: Evaluation of Insulating Compositions The insulating compositions of Examples 1 to 6 and Comparative Examples 1 to 3 were evaluated using the following methods, and the results are shown in Tables 1 and 2 below.

[0179] (1) Viscosity: The cone plate PP25 was attached to the viscosity measuring device (Anton Paar, MCR302E) and measured at room temperature for 10 seconds. -1 The viscosity was measured by the shear rate and then evaluated according to the following criteria.

[0180] ◎: In 10s -1 At shear rates, the viscosity is in the range of 1000 mPa·s to 2000 mPa·s. ○: In 10s -1 At shear rates of 1000 mPa·s to 2000 mPa·s, the viscosity deviates by less than or equal to 500 mPa·s. △: in 10s -1 At the shear rate, the viscosity deviates by more than 500 mPa·s in the range of 1000 mPa·s to 2000 mPa·s. X: Viscosity is unmeasurable (2) TI: The thixotropic index (TI) is evaluated according to the following standard, which is based on a shear rate of 1 s after viscosity measurement. -1 The viscosity at that time divided by the shear rate is 10 s. -1 The viscosity at that time is obtained by taking the logarithm.

[0181] ◎: TI is less than 0.2 ○: TI is 0.2 to 0.5 △: TI > 0.5 X: Viscosity is unmeasurable Evaluation Example 2: Evaluation of Insulating Layer and Positive Electrode The positive electrodes of Examples 1 to 6 and Comparative Examples 1 to 3 were evaluated using the following methods, and the results are shown in Tables 1 and 2 below.

[0182] (1) Crosslinking density: Calculated as the weight ratio of the first binder to the crosslinked polymer based on the total weight of the first binder, the second binder, and the inorganic particles in the insulating layer formed from the insulating composition at 100 wt%. For reference, the insulating layer formed from the insulating composition, excluding the solvent, comprises the first binder, the second binder, and the inorganic particles.

[0183] ◎: Crosslinking density greater than 20% ○: Crosslinking density is 10% to 20%. △: Crosslinking density greater than 0% and less than 10% X: Crosslinking density is 0% (2) Adhesion strength (peeling): Each insulating composition was coated onto an aluminum substrate to a thickness of 10 μm, dried in an oven at 130°C, and then immersed in an electrolyte. After 24 hours, the insulation layer was checked to see if it had detached from the aluminum substrate. The results were evaluated according to the following criteria. Here, the electrolyte used is the same as that used in Example 1.

[0184] ◎: Detached from 0 area % ○: Area percentage with a probability of detachment greater than 0% and less than or equal to 10% △: The probability of detachment is greater than 10% and less than or equal to 20% of the area. X: Area percentage with a greater than 20% probability of detachment (3) Swelling rate: Each insulating composition was coated onto an aluminum substrate to a thickness of 10 μm, dried in an oven at 130°C, and then immersed in an electrolyte. After 24 hours at room temperature, the length change of each insulating layer was measured. The results were evaluated according to the following criteria. Here, the electrolyte used is the same as that used in Example 1.

[0185] ◎: Swelling rate is 0% of length. ○: Swelling rate greater than 0% and less than or equal to 5% of length. △: Swelling rate greater than 5% and less than or equal to 10% of length X: Swelling rate greater than 10% of length Evaluation Example 3: Evaluation of Rechargeable Lithium-ion Battery Cells The insulating compositions of Examples 1 to 6 and Comparative Examples 1 to 3 were evaluated using the following methods, and the results are shown in Tables 1 and 2 below.

[0186] Cycle life characteristics are evaluated by calculating the ratio of the discharge capacity of the 500th cycle to the discharge capacity of the 1st cycle after 500 charge and discharge cycles of a button cell at 0.5C within a voltage range of 2.0 to 4.0V at 25°C.

[0187] ◎: Cycle life characteristics greater than 90% ○: Cycle life characteristics are 80% to 90%. △: Cycle life characteristic greater than or equal to 60% and less than 80% X: Cycle life characteristics less than 60%. Table 1:

[0188] Table 2:

[0189] The insulating compositions for rechargeable lithium batteries represented by Examples 1 to 6 include a crosslinked polymer of a first polymer and a second polymer as a binder, so that the desired or improved adhesive strength can be maintained within the rechargeable lithium battery even after coating without the use of an SBR binder.

[0190] Therefore, electrodes and rechargeable lithium batteries manufactured using the insulating composition for rechargeable lithium batteries according to the foregoing example embodiments can exhibit desired or improved cycle life characteristics.

[0191] While this disclosure has been described in conjunction with exemplary embodiments now considered to be practical, it will be understood that the disclosure is not limited to the disclosed exemplary embodiments. Rather, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

[0192] Description of reference numerals in the attached figures: 100: Rechargeable lithium battery; 10: Positive electrode 11: Positive electrode lead connector 12: Positive electrode terminal 20: Negative electrode 21: Negative electrode lead connector 22: Negative electrode terminal; 30: Diaphragm 40: Electrode assembly; 50: Housing 60: Sealing component; 70: Electrode terminal piece 71: Positive electrode connector; 72: Negative electrode connector.

Claims

1. An insulating composition for a rechargeable lithium battery, said insulating composition comprising: Adhesives, including cross-linked polymers of a first polymer and a second polymer; Inorganic particles; as well as Solvent, The first polymer comprises a first main chain and first side groups. The first side group is represented by chemical formula 1. The second polymer includes amino groups: Chemical Formula 1: -L 1 -L 2 -X In chemical formula 1, It is the part connected to the first main chain; L 1 It is a single bond, a substituted or unsubstituted cycloalkylene group having 3 to 30 carbon atoms, a substituted or unsubstituted heteroalkylene group having 2 to 30 carbon atoms, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 30 carbon atoms; L 2 It is a single bond, an alkylene group having one or two carbon atoms, or an alkenyl group having two carbon atoms; and X includes at least one of F, Cl, Br and I.

2. The insulating composition according to claim 1, wherein, Chemical formula 1 can be represented by any one of chemical formulas 1-1 to 1-3: Chemical Formula 1-1 Chemical formula 1-2 Chemical formulas 1-3 。 3. The insulating composition according to claim 1, wherein, The first main chain includes one of polyethylene and polysulfone.

4. The insulating composition according to claim 1, wherein: The first polymer includes a first repeating unit, and The first repeating unit is represented by any one of the chemical formulas A1 to A3: Chemical formula A1 Chemical formula A2 Chemical formula A3 。 5. The insulating composition according to claim 1, wherein, The second polymer includes one of the following: The second main chain consists only of amino groups; and The second main chain does not include amino groups and the second side chain includes amino groups.

6. The insulating composition according to claim 5, wherein, The second side group, including the amino group, is represented by chemical formula 2: Chemical formula 2 -L 3 -Y In chemical formula 2, It is the part that connects to the second main chain; L 3 It is a single-bonded, substituted or unsubstituted cycloalkylene group having 3 to 30 carbon atoms, a substituted or unsubstituted heteroalkylene group having 2 to 30 carbon atoms, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 30 carbon atoms; and Y is -NH2, pyridinyl, or 2-pyrrolidone.

7. The insulating composition according to claim 6, wherein, Chemical formula 2 can be represented by any one of chemical formulas 2-1 to 2-4: Chemical formula 2-1 Chemical formula 2-2 Chemical formula 2-3 Chemical formula 2-4 。 8. The insulating composition according to claim 5, wherein: The second main chain, excluding amine groups, comprises polyethylene; and The second main chain, including the amino group, includes polyethyleneimine.

9. The insulating composition according to claim 1, wherein: The second polymer includes a second repeating unit, and The second repeating unit is represented by any one of chemical formulas B1 to B5: Chemical formula B1 Chemical formula B2 Chemical formula B3 Chemical formula B4 Chemical formula B5 。 10. The insulating composition according to claim 1, wherein: The crosslinked polymer of the first polymer and the second polymer is a first adhesive. Polyvinylidene fluoride is the second binder, and The adhesive is one of the following: consisting solely of the first adhesive; or consisting of a mixture of the first adhesive and the second adhesive.

11. The insulating composition according to claim 1, wherein, At 25°C for 10 seconds -1 At a shear rate of 500 mPa·s, the insulating composition has a viscosity in the range of 2500 mPa·s.

12. The insulating composition according to claim 1, wherein: The insulating composition has a thixotropic index value of less than or equal to 0.

5.

13. An electrode for a rechargeable lithium battery, the electrode comprising: Electrode active material layer; An electrode current collector includes a coated area where the electrode active material layer is provided and an uncoated area where the electrode active material layer is not provided; as well as An insulating layer is configured to coat at least a portion of the uncoated area. The insulating layer comprises: an adhesive, a cross-linked polymer comprising a first polymer and a second polymer; and inorganic particles. The first polymer includes a first main chain and first side groups. The first side group is represented by chemical formula 1, and The second polymer includes amino groups: Chemical Formula 1: -L 1 -L 2 -X In chemical formula 1, It is the part connected to the first main chain; L 1 It is a single bond, a substituted or unsubstituted cycloalkylene group having 3 to 30 carbon atoms, a substituted or unsubstituted heteroalkylene group having 2 to 30 carbon atoms, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 30 carbon atoms; L 2 It is a single bond, an alkylene group having one or two carbon atoms, or an alkenyl group having two carbon atoms; and X includes at least one of F, Cl, Br and I.

14. The electrode according to claim 13, wherein, The insulating layer covers the burrs formed at the edge of the electrode active material layer and a portion of the uncoated area.

15. The electrode according to claim 13, wherein: The crosslinking density is greater than or equal to 10%.

16. The electrode according to claim 13, wherein: Based on the total area of ​​the insulating layer (100%), the area of ​​the insulating layer detached from the electrode after immersing the electrode in the electrolyte for 24 hours is less than or equal to 10%.

17. The electrode according to claim 13, wherein: Based on the total length of the insulating layer (100% of the total length), after immersing the electrode in the electrolyte and keeping it at room temperature for 24 hours, the change in the length of the insulating layer is less than or equal to 5%.

18. The electrode according to claim 13, wherein, The thickness of the insulating layer is in the range of 5 μm to 100 μm.

19. A rechargeable lithium battery, said rechargeable lithium battery comprising: Positive electrode; negative electrode; A diaphragm is located between the positive electrode and the negative electrode; as well as Electrolyte Wherein, at least one of the positive electrode and the negative electrode comprises an electrode according to any one of claims 13 to 18.

20. The rechargeable lithium battery according to claim 19, wherein: The rechargeable lithium battery has a cycle life characteristic of greater than or equal to 60%, which is expressed as the ratio of the discharge capacity of the 500th cycle to the discharge capacity of the 1st cycle after 500 charge / discharge cycles at 0.5C at 25°C within a voltage range of 2.0V to 4.0V.

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