Rechargeable lithium battery

Abstract

A rechargeable lithium battery is disclosed. The rechargeable lithium battery includes: an electrode assembly; a battery case accommodating the electrode assembly; and a thermal inhibition layer between the electrode assembly and the battery case, in which the thermal inhibition layer includes a compound that inhibits heat generation selected from the group consisting of FeF3, FeF2, CuF2, MoCl5, NiF2, FeCl3, CoF3, CoF2, MnF3, NbF3, TiF4, ZnF2, BiF3, SeO2, CuO, CuO2, P2S5, P4S7, NiS2, CoS2, FeS2, SiS2, V2O5, S8, or a combination thereof.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a rechargeable lithium battery. Background Art

[0002] Recently, the rapid development of electronic devices such as mobile phones, laptop computers, and electric vehicles using batteries has caused a surprising increase in the use of rechargeable batteries having relatively high capacity and lighter weight.

[0003] Such a rechargeable lithium battery includes a positive electrode including a positive active material, a negative electrode including a negative active material, a separator between the positive electrode and the negative electrode, and an electrolyte.

[0004] Recently, the use of batteries that can be quickly charged and have excellent safety (do not cause problems such as explosion and fire) has been increasing.

[0005] These developments are useful for conducting research for improving fast charging and safety while satisfying the physical properties of batteries, such as capacity. Summary of the invention

[0006] One or more embodiments of the present disclosure provide a rechargeable lithium battery exhibiting excellent safety.

[0007] One or more embodiments provide a rechargeable lithium battery, the rechargeable lithium battery comprising: an electrode assembly; a battery case accommodating the electrode assembly; a heat suppression layer between the electrode assembly and the battery case, wherein the heat suppression layer comprises a compound that suppresses heat generation, the compound being selected from FeF 3 , FeF 2 ,CuF 2 、MoCl 5 、NiF 2 、FeCl 3 , CoF 3 , CoF 2 、MnF 3 ,NbF 3 、TiF 4 、ZnF 2 、BiF 3 , SeO 2 ,CuO,CuO 2 , P 2 S 5 , P 4 S 7 、NiS 2 、CoS 2 , FeS 2 、SiS 2 、V 2 O5 , S 8 or a combination thereof.

[0008] The embodiment provides a rechargeable lithium battery, the rechargeable lithium battery comprising: an electrode assembly; a battery case accommodating the electrode assembly; a heat suppression layer between the electrode assembly and the battery case, wherein the heat suppression layer comprises a compound for suppressing heat generation, the compound being selected from TiO 2 , Fe 2 O 3 、MnO 2 、Co 3 O 4 、MoO 3 or a combination thereof, and based on the thickness of the battery case (eg, the thickness of a wall of the battery case), the thickness of the heat inhibition layer is about 25% to about 100%.

[0009] The embodiment provides a rechargeable lithium battery, the rechargeable lithium battery comprising: an electrode assembly; a battery case accommodating the electrode assembly; a heat suppression layer between the electrode assembly and the battery case, wherein the heat suppression layer comprises a first compound for suppressing heat generation and a second compound for suppressing heat generation, the first compound being selected from TiO 2 , Fe 2 O 3 、MnO 2 、Co 3 O 4 、MoO 3 or a combination thereof, the second compound is selected from FeF 3 , FeF 2 ,CuF 2 、MoCl 5 、NiF 2 、FeCl 3 , CoF 3 , CoF 2 、MnF 3 ,NbF 3 、TiF 4 、ZnF 2 、BiF 3 , SeO 2 ,CuO,CuO 2 , P 2 S 5 , P 4 S 7 、NiS 2 、CoS 2 , FeS 2 、SiS 2 、V 2 O 5 , S 8 or a combination thereof.

[0010] Other embodiments are included in the detailed description below.

[0011] The rechargeable lithium battery according to one or more embodiments may exhibit excellent safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings, together with the specification, illustrate embodiments of the presently disclosed subject matter, and, together with the description, serve to explain principles of the embodiments of the presently disclosed subject matter.

[0013] Figure 1A and Figure 1B is a schematic perspective view illustrating a rechargeable lithium battery including an insulating tape and a heat suppression layer according to one or more embodiments.

[0014] Figure 2 is a schematic partially exploded perspective view illustrating a rechargeable lithium battery according to one or more embodiments.

[0015] Figure 3 is a schematic cross-sectional view showing a rechargeable lithium battery according to an embodiment.

[0016] Figure 4 is a schematic perspective view showing a rechargeable lithium battery according to an embodiment.

[0017] Figure 5 is a schematic perspective view showing a rechargeable lithium battery according to an embodiment. DETAILED DESCRIPTION

[0018] Hereinafter, embodiments are described in more detail. However, these embodiments are examples, the present disclosure is not limited thereto, and the scope of the present disclosure is defined by the scope of the appended claims and their equivalents.

[0019] The terms used in the specification are for explaining the exemplary embodiments and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, an expression in the singular includes an expression in the plural form.

[0020] The term "combinations thereof" may include mixtures, laminates, composites, copolymers, alloys, blends, and / or reaction products of the components (eg, reactants).

[0021] The terms "comprises," "including," or "having" are intended to indicate the presence of the stated features, quantities, steps, constituent elements (components), or combinations thereof, but it should be understood that the possibility of the presence or addition of one or more other features, quantities, steps, constituent elements (components), or combinations thereof, is not precluded.

[0022] The terms "approximately" and "substantially" used throughout the specification refer to the meaning of the reference with inherent manufacturing tolerances and material tolerances (if any), and are used in the sense of being close to or near the stated values. These terms are used to aid in understanding the subject matter of the present disclosure and prevent the present disclosure from being limited to strict precise values ​​or absolute values.

[0023] Here, “or” is not to be interpreted as an exclusive meaning, for example, “A or B” is interpreted to include A, B, A+B, etc.

[0024] As used herein, if no definition is provided in addition, particle diameter or particle size can be average particle diameter.Such particle diameter indicates that the cumulative volume is the average particle diameter or average particle size (D50) of about 50 volume % in particle size distribution.Average particle size (D50) can be measured by any suitable method commonly used in the art.Average particle size (D50) can be measured, for example, by a particle size analyzer and / or by a transmission electron microscope image and / or a scanning electron microscope image. In certain embodiments, a dynamic light scattering measuring device can be used to perform data analysis, and for each particle size range, the number of particles is counted, thus, average particle diameter (D50) value can be easily obtained by calculation.In an embodiment, average particle diameter (D50) can be measured by a laser diffraction method. Laser diffraction can be performed by dispersing the particles to be measured in a dispersion solvent and introducing them into a commercially available laser diffraction particle measuring device (e.g., MT 3000 available from Microtrac Co., Ltd.), irradiating ultrasonic waves of about 28 kHz at a power of 60 W, and calculating the average particle size (D50) based on the 50% standard of the particle distribution in the measuring device.

[0025] One or more embodiments provide a rechargeable lithium battery including: an electrode assembly; a battery case accommodating the electrode assembly; and a heat inhibition layer between the electrode assembly and the battery case.

[0026] The heat suppression layer includes a compound that suppresses (e.g., reduces) heat generation, and may also include a binder. The binder may include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, polyethylene oxide, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyethylene, polypropylene, styrene-butadiene rubber, acrylated styrene-butadiene rubber, epoxy resin, nylon, or a combination thereof.

[0027] If the heat suppression layer further includes a binder, the mixing ratio of the compound suppressing heat generation to the binder may be about 99:1 weight ratio to about 1:99 weight ratio, about 99:1 weight ratio to about 5:95 weight ratio, or about 95:5 weight ratio to about 5:95 weight ratio. If the mixing ratio of the compound suppressing heat generation to the binder satisfies the above range, the effect of controlling thermal runaway of the battery can be greatly obtained.

[0028] In some embodiments, the rechargeable lithium battery may be a pouch battery, a can battery, or a combination thereof. If the rechargeable lithium battery according to some embodiments is a can battery, the heat suppression layer may be made thicker, thereby further enhancing the effect of the compound suppressing heat generation.

[0029] In some embodiments, a can battery may refer to a battery whose battery case is a can type, and may be a cylindrical battery or a prismatic battery.

[0030] In one or more embodiments, the rechargeable lithium battery may further include an insulating tape (e.g., an electrically insulating tape) between the electrode assembly and the battery case. For example, the insulating tape may surround the electrode assembly. In one or more embodiments, the heat inhibition layer may be between the insulating tape and the battery case, or between the insulating tape and the electrode assembly. The heat inhibition layer may be coated on the insulating tape to be located between the insulating tape and the battery case, between the electrode assembly and the insulating tape, or may be coated on the battery case to be located between the insulating tape and the battery case.

[0031] The rechargeable lithium battery according to one or more embodiments may further include a finishing tape that surrounds the electrode assembly to fix the electrode assembly, thereby preventing or reducing loosening of the electrode assembly during insertion of the electrode assembly into the battery case, and the heat inhibition layer may be coated on the finishing tape to be included in the battery. If the rechargeable lithium battery includes both an insulating tape and a finishing tape, the finishing tape may contact the battery case, the heat inhibition layer may be between the insulating tape and the finishing tape or between the finishing tape and the battery case, or the heat inhibition layer may be between the electrode assembly and the insulating tape.

[0032] First embodiment

[0033] The heat suppression layer includes a compound for suppressing heat generation, the compound being selected from FeF 3 , FeF 2 ,CuF 2 、MoCl 5 、NiF 2 、FeCl 3 , CoF 3 , CoF 2 、MnF 3 ,NbF 3 、TiF 4 、ZnF2 、BiF 3 , SeO 2 ,CuO,CuO 2 , P 2 S 5 , P 4 S 7 、NiS 2 、CoS 2 , FeS 2 、SiS 2 、V 2 O 5 , S 8 or a combination thereof. The compound that suppresses heat generation may include FeF 3 .

[0034] In one or more embodiments, if the battery is pierced by a sharp object such as a nail and / or subjected to physical impact such as penetration, the heat inhibition layer enhances safety by preventing or reducing the occurrence of battery explosion and / or fire, etc. This can provide improved battery safety for rechargeable lithium batteries.

[0035] In one or more embodiments, the thickness of the heat inhibition layer may be about 2 μm to about 600 μm, about 10 μm to about 600 μm, about 100 μm to about 500 μm, or about 200 μm to about 300 μm. If the thickness of the heat inhibition layer is within the above range, battery safety may be further enhanced.

[0036] In one or more embodiments, the amount of the heat-suppressing compound may be about 1 wt % to about 99 wt %, or about 5 wt % to about 95 wt %, based on 100 wt % of the heat-suppressing layer. If the amount of the heat-suppressing compound is within the above range, safety assessments such as heat diffusion between batteries in a module, penetration of the battery itself, collision, drop, and / or heat exposure may be improved.

[0037] Second embodiment

[0038] The heat suppression layer includes a compound for suppressing heat generation, the compound being selected from TiO 2 , Fe 2 O 3 、MnO 2 、Co 3 O 4 、MoO 3 Or a combination thereof, and based on the thickness of the battery housing (e.g., based on the thickness of the wall of the battery housing), the thickness of the heat inhibition layer is about 25% to about 100%. Based on the thickness of the battery housing, the thickness of the heat inhibition layer may be about 30% to about 90% or about 40% to about 60%.

[0039] The heat suppression layer included at a thickness of about 25% to about 100% based on the thickness of the battery case (e.g., based on the thickness of the wall of the battery case) can greatly enhance the suppression or reduction of the battery temperature increase in safety hazards such as battery penetration, the heat suppression layer including TiO as a compound for suppressing heat generation. 2 , Fe 2 O 3 、MnO 2 、Co 3 O 4 、MoO 3 .

[0040] In one or more embodiments, the heat-suppressing compound may be TiO 2 .

[0041] In one or more embodiments, the thickness of the heat inhibition layer may be about 150 μm to about 600 μm, about 150 μm to about 500 μm, or about 150 μm to about 400 μm. When the thickness of the heat inhibition layer satisfies a ratio of about 25% to about 100% based on the thickness of the battery case (e.g., based on the thickness of the wall of the battery case), if the thickness is within the above range, the effect of suppressing or reducing the increase in battery temperature can be largely achieved in safety hazards such as penetration.

[0042] In one or more embodiments, the amount of the heat-suppressing compound may be about 1 wt % to about 99 wt %, or about 5 wt % to about 95 wt % based on 100 wt % of the heat-suppressing layer. If the amount of the heat-suppressing compound is within the above range, battery safety may be further enhanced.

[0043] Third embodiment

[0044] The heat suppression layer includes a first compound that suppresses heat generation and a second compound that suppresses heat generation, wherein the first compound is selected from TiO 2 , Fe 2 O 3 、MnO 2 、Co 3 O 4 、MoO 3 or a combination thereof, the second compound is selected from FeF 3 , FeF 2 ,CuF 2 、MoCl 5 、NiF 2 、FeCl 3 , CoF 3 , CoF 2 、MnF 3 ,NbF 3 、TiF 4 、ZnF2 、BiF 3 , SeO 2 ,CuO,CuO 2 , P 2 S 5 , P 4 S 7 、NiS 2 、CoS 2 , FeS 2 、SiS 2 、V 2 O 5 , S 8 or a combination thereof.

[0045] In one or more embodiments, the first compound for suppressing heat generation may be TiO 2 The second compound that suppresses heat generation may be FeF 3 .

[0046] If the first compound suppressing heat generation and the second compound suppressing heat generation are mixed together and used as the compound suppressing heat generation, the rise in the maximum exothermic temperature during battery breakthrough can be more effectively suppressed or reduced.

[0047] In some embodiments, the mixing ratio of the first heat-suppressing compound and the second heat-suppressing compound may be about 5:95 weight ratio to about 95:5 weight ratio, about 20:80 weight ratio to about 80:20 weight ratio, or about 40:60 weight ratio to about 60:40 weight ratio. If the mixing ratio of the first heat-suppressing compound to the second heat-suppressing compound is within the above range, the effect of suppressing or reducing the rise of the maximum exothermic temperature can be additionally obtained.

[0048] The amount of the first compound suppressing heat generation may be about 0.4 wt % to about 94.5 wt %, about 1 wt % to about 90 wt %, or about 2.5 wt % to about 90 wt %, based on 100 wt % of the heat suppression layer.

[0049] The amount of the second compound suppressing heat generation may be about 0.4 wt % to about 94.5 wt %, about 1 wt % to about 90 wt %, or about 2.5 wt % to about 90 wt % based on 100 wt % of the heat suppression layer.

[0050] When the mixing ratio of the first heat-suppressing compound and the second heat-suppressing compound satisfies the above range, if the respective amounts of the first heat-suppressing compound and the second heat-suppressing compound are within the above range, the effect of suppressing or reducing the rise in the maximum exothermic temperature can be further improved.

[0051] The thickness of the heat inhibition layer may be about 2 μm to about 600 μm, about 10 μm to about 600 μm, about 100 μm to about 500 μm, or about 200 μm to about 300 μm. If the thickness of the heat inhibition layer is within the above range, battery safety may be further improved.

[0052] Method for preparing heat inhibition layer

[0053] In one or more embodiments, regardless of the first, second, or third embodiments, the heat inhibition layer may be coated on the electrode assembly to be included in the battery, and / or the heat inhibition layer may be coated on the battery case to be included in the battery. In some embodiments, the heat inhibition layer may be coated on the insulating tape and / or the finishing tape and may be included in the battery.

[0054] For example, the heat inhibition layer may be formed by any suitable process as long as it can be disposed between the electrode assembly and the battery case. Hereinafter, a representative example process of forming the heat inhibition layer will be briefly described, but the present disclosure is not limited thereto.

[0055] The compound and the binder that suppress heat generation are mixed together in a solvent to prepare a heat inhibition layer composition. The binder may be polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer or a combination thereof. The solvent may be an organic solvent such as N-methylpyrrolidone. The mixing ratio of the compound that suppresses heat generation and the binder may be about 99:1 weight ratio to about 1:99 weight ratio, about 99:1 weight ratio to about 5:95 weight ratio, or about 95:5 weight ratio to about 5:95 weight ratio. If the mixing ratio of the compound that suppresses heat generation and the binder is within the above range, the effect of controlling or reducing the temperature rise of the battery can be achieved, thereby improving the shortcomings associated with safety (such as penetration).

[0056] The heat inhibition layer may be prepared by coating the heat inhibition layer composition on a coating object and drying it.

[0057] The drying may be performed at about 60°C to about 140°C or about 80°C to about 120°C.

[0058] The method for preparing the heat inhibition layer may include adding an adhesive to a solvent to prepare an adhesive liquid, adding a heat inhibiting compound to the adhesive liquid to prepare a heat inhibiting compound liquid (e.g., a heat inhibition layer composition), applying the heat inhibiting compound liquid on a coating object and drying. The adhesive and the solvent may be the substances described above.

[0059] The coating of the liquid of the heat suppressing compound may be performed by spraying, spraying using a slot die, and / or dip coating. Drying may be performed at about 60°C to about 140°C or about 80°C to about 120°C.

[0060] The method for preparing a heat suppression layer may include applying an adhesive liquid to a battery housing to prepare an adhesive layer, applying a liquid of a compound that suppresses heat generation to the adhesive layer and drying. The adhesive liquid may be prepared by adding an adhesive to a first solvent, and the liquid of a compound that suppresses heat generation may be prepared by adding the compound that suppresses heat generation to a second solvent. The adhesive, the first solvent, and the second solvent may be the same as the aforementioned adhesive and solvent, and the first solvent and the second solvent may be the same or different from each other. Coating and drying may be performed by the same process as the above process.

[0061] In an embodiment, the heat suppression layer may be prepared by adhering a double-sided tape to the coating object and then adhering a compound that suppresses heat generation on the double-sided tape. The double-sided tape may be any suitable tape as long as it has adhesive properties.

[0062] In some embodiments, the battery housing can be any suitable housing commonly used in batteries, such as a metal can, a metal laminate and / or a metal bag, and in an embodiment, the battery housing can be a metal can. The metal can include aluminum and / or a nickel alloy, but is not limited thereto. The nickel alloy can include an alloy of nickel and M (wherein M is Cu, Fe, Cr, Ti, Mo, Nb, Al, Mn, Si, W, Co, C (non-metal) or a combination thereof). For example, the nickel alloy can include Ni-Cu, Ni-Fe, Ni-Cr, Ni-Ti, Ni-Mo, Ni-Nb, Ni-Al, Ni-Mn, Ni-Si, Ni-W, Ni-Co, Ni-C, Ni-Cr-Fe, Ni-Cr-Mo, Ni-Cr-Co and / or Ni-Cr-Fe-Mo.

[0063] Electrode assembly

[0064] An electrode assembly according to one or more embodiments may include a positive electrode, a separator, and a negative electrode.

[0065] Positive electrode

[0066] The positive electrode may include a current collector and a positive active material layer on the current collector. The positive active material layer includes a positive active material, and may further include a binder and / or a conductive material (eg, an electrically conductive material).

[0067] The amount of the positive active material may be about 90 wt % to about 99.5 wt % based on 100 wt % of the positive active material layer, and the amount of each of the binder and the conductive material may be about 0.5 wt % to about 5 wt % based on 100 wt % of the positive active material layer.

[0068] For example, the positive electrode may also include an additive that may serve as a sacrificial positive electrode.

[0069] The positive active material may include a lithiated intercalation compound that reversibly intercalates and deintercalates lithium ions. In some embodiments, at least one of a composite oxide of lithium and a metal selected from cobalt, manganese, nickel, and a combination thereof may be used.

[0070] The composite oxide may be a lithium transition metal composite oxide, and examples thereof may include lithium nickel-based oxides, lithium cobalt-based oxides, lithium manganese-based oxides, lithium iron phosphate-based compounds, cobalt-free nickel manganese-based oxides, or combinations thereof.

[0071] As an example, a compound represented by any of the following chemical formulas may 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 D α (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 O 2 (0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.1); Li a NeG b O 2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a CoG b O 2 (0.90≤a≤1.8, 0.001≤b≤0.1); Lia Mn 1-b G b O 2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 2 G b O 4 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-g G g PO 4 (0.90≤a≤1.8, 0≤g≤0.5); Li (3-f) Fe 2 (PO 4 ) 3 (0≤f≤2);Li a FePO 4 (0.90≤a≤1.8).

[0072] In the above chemical formula, A is Ni, Co, Mn or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element or a combination thereof; D is O, F, S, P or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V or a combination thereof; and L 1 It is Mn, Al or a combination thereof.

[0073] For example, the positive electrode active material may be a high nickel positive electrode active material, wherein the amount of nickel 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 mol%, or greater than or equal to about 94 mol% and less than or equal to about 99 mol%, based on 100 mol% of metals other than lithium in the lithium transition metal composite oxide. The high nickel positive electrode active material can achieve high capacity and can be applied to high capacity, high density rechargeable lithium batteries.

[0074] The binder improves the bonding performance between the positive electrode active material particles and between the positive electrode active material particles and the current collector. Examples of the binder may be polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide-containing polymers, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene butadiene rubber, (meth) acrylated styrene butadiene rubber, epoxy resin, (meth) acrylic resin, polyester resin and / or nylon, etc., but are not limited thereto.

[0075] A conductive material is included to provide electrode conductivity (e.g., electrical conductivity), and any suitable conductive material can be used as the conductive material unless it causes chemical changes (e.g., undesirable chemical changes in a rechargeable lithium battery). Examples of the conductive material may include: carbon-based materials such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, and / or carbon nanotube, etc.; metal-based materials including metal powders and / or metal fibers of copper, nickel, aluminum, and / or silver, etc.; conductive polymers (e.g., electrically conductive polymers) such as polyphenylene derivatives; or mixtures thereof.

[0076] The current collector may include Al, but is not limited thereto.

[0077] Negative electrode

[0078] The negative electrode includes a current collector and a negative active material layer on the current collector. The negative active material layer includes a negative active material, and may further include a binder and / or a conductive material (eg, an electrically conductive material).

[0079] For example, the negative electrode active material layer may include about 90 wt % to about 99 wt % of the negative electrode active material and about 1 wt % to about 10 wt % of the binder, or may include about 90 wt % to about 99 wt % of the negative electrode active material, about 0.5 wt % to about 5 wt % of the binder, and about 0.5 wt % to about 5 wt % of the conductive material (e.g., based on 100 wt % of the negative electrode active material layer).

[0080] The negative electrode active material may include a material that reversibly intercalates / deintercalates lithium ions, lithium metal, a lithium metal alloy, a material capable of doping / dedoping lithium, and / or a transition metal oxide.

[0081] The material that reversibly intercalates / deintercalates lithium ions may include a carbon-based negative electrode active material, such as crystalline carbon, amorphous carbon, or a combination thereof. Crystalline carbon may be graphite, such as natural graphite and / or artificial graphite in an indefinite shape, flake, flaky, spherical, and / or fibrous form. Amorphous carbon may be soft carbon, hard carbon, mesophase pitch carbide, and / or calcined coke, etc.

[0082] Lithium metal alloys include alloys of lithium and a metal selected from Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al and Sn.

[0083] The material capable of being doped / dedoped with lithium may be a Si-based negative electrode active material and / or a Sn-based negative electrode active material. The Si-based negative electrode active material may include silicon, silicon-carbon composites, SiO x(0 < x < 2) and / or Si-Q alloys (where Q is selected from 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). The Sn-based negative electrode active material may include Sn, SnO 2 , Sn-based alloys, or combinations thereof.

[0084] The silicon-carbon composite may be a composite of silicon and amorphous carbon. According to an embodiment, the silicon-carbon composite may be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles. For example, the silicon-carbon composite may include secondary particles (cores) in which primary silicon particles are aggregated and an amorphous carbon coating layer (shells) on the surface of the secondary particles. Amorphous carbon may also be located between the primary silicon particles. For example, the primary silicon particles may be coated with amorphous carbon. The secondary particles may be dispersed in the amorphous carbon matrix.

[0085] The silicon particles may be nano-silicon particles. In one or more embodiments, the average particle size of the nano-silicon particles may be from about 10 nm to about 1000 nm, from about 20 nm to about 900 nm, from about 20 nm to about 800 nm, from about 20 nm to about 500 nm, from about 20 nm to about 300 nm, or from about 20 nm to about 150 nm. If the average particle size of the nano-silicon particles is within the above range, excessive volume expansion caused during charging and discharging can be suppressed or reduced, and damage to the conduction path due to particle fragmentation can be prevented or reduced.

[0086] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core containing crystalline carbon and silicon particles and an amorphous carbon coating layer on the surface of the core.

[0087] If the silicon-carbon composite includes silicon particles, crystalline carbon, and amorphous carbon, based on the total 100 wt% of the silicon-carbon composite, the amount of amorphous carbon may be from about 30 wt% to about 70 wt%, and based on the total 100 wt% of the silicon-carbon composite, the amount of crystalline carbon may be from about 1 wt% to about 20 wt%. Based on the total 100 wt% of the silicon-carbon composite, the amount of silicon particles may be from about 20 wt% to about 69 wt%, and according to one or more embodiments, may be from about 30 wt% to about 60 wt%.

[0088] The Si-based negative electrode active material and / or the Sn-based negative electrode active material may be used together with the carbon-based negative electrode active material.

[0089] In some embodiments, a silicon-carbon composite may be included as a first negative electrode active material, and crystalline carbon may be included as a second negative electrode active material. The mixing ratio of the first negative electrode active material and the second negative electrode active material may be about 1:99 weight ratio to about 99:1 weight ratio. In some embodiments, the negative electrode active material may include a first negative electrode active material and a second negative electrode active material in a weight ratio of about 1:99 to about 50:50 or a weight ratio of about 5:95 to about 20:80.

[0090] The particle size of the Si—C composite may be suitably or appropriately controlled without limitation.

[0091] The binder improves the binding properties between the negative electrode active material particles and between the negative electrode active material particles and the current collector. The binder may be a non-aqueous binder, an aqueous binder, a dry binder or a combination thereof.

[0092] The non-aqueous binder may include polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamideimide, polyimide, or a combination thereof.

[0093] The aqueous adhesive may include styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluororubber, polyethylene oxide, polyvinyl pyrrolidone, polyepichlorohydrin, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinyl pyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol or a combination thereof.

[0094] As the binder of the negative electrode, a cellulose compound can be used. In certain embodiments, an aqueous binder can be used as a binder of the negative electrode together with a cellulose compound. The cellulose compound can include one or more of carboxymethyl cellulose, hydroxypropyl methylcellulose, methyl cellulose and its alkali metal salt. The alkali metal can be Na, K and / or Li. The cellulose compound can impart or increase viscosity (referred to as a thickener) and can be used as a binder (can be referred to as a binder). The amount of the cellulose compound can be suitably or appropriately adjusted without limiting it.

[0095] The dry binder can be a polymer material that can be fibrous (eg, can be fiberized or fibrillated). For example, the dry binder can be polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or a combination thereof.

[0096] A conductive material is included to provide electrode conductivity (e.g., electrical conductivity), and any suitable electrically conductive material can be used as the conductive material unless it causes chemical changes (e.g., undesirable chemical changes in a rechargeable lithium battery). Examples of the conductive material may be: a carbon-based material such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, and / or carbon nanotube, etc.; a metal-based material including metal powder and / or metal fiber of copper, nickel, aluminum, silver, etc.; a conductive polymer (e.g., an electrically conductive polymer) such as a polyphenylene derivative; or a mixture thereof.

[0097] The current collector may include one selected from copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with a conductive metal (eg, electrically conductive metal), and combinations thereof, but is not limited thereto.

[0098] Electrolyte

[0099] The electrolyte may include a non-aqueous organic solvent and a lithium salt.

[0100] The non-aqueous organic solvent may be a carbonate solvent, an ester solvent, an ether solvent, a ketone solvent, an alcohol solvent, an aprotic solvent or a combination thereof.

[0101] The carbonate solvent may include dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), ethyl methyl carbonate (MEC), ethylene carbonate (EC), propylene carbonate (PC) and / or butylene carbonate (BC), etc.

[0102] The ester solvent may include methyl acetate, ethyl acetate, n-propyl acetate, dimethyl acetate, methyl propionate, ethyl propionate, decanoic acid lactone, mevalonolactone, valerolactone and / or caprolactone, etc.

[0103] Ether solvents may include dibutyl ether, tetraethylene glycol dimethyl ether, diethylene glycol dimethyl ether, dimethoxyethane, 2-methyltetrahydrofuran, 2,5-dimethyltetrahydrofuran and / or tetrahydrofuran, etc. Ketone solvents may include cyclohexanone, etc. Alcohol solvents may include ethanol and / or isopropanol, etc. Aprotic solvents may include nitrile (such as R-CN (wherein R is a C2 to C20 straight chain, branched or cyclic hydrocarbon group, and may include a double bond, an aromatic ring and / or an ether bond, etc.), amides (such as dimethylformamide), dioxolanes (such as 1,3-dioxolanes and / or 1,4-dioxolanes), etc.; and / or sulfolane, etc.

[0104] The nonaqueous organic solvent may be used alone or in combination of two or more.

[0105] If a carbonate-based solvent is used, a cyclic carbonate and a chain carbonate may be mixed together and used, and the cyclic carbonate and the chain carbonate may be mixed together in a volume ratio of about 1:1 to about 1:9.

[0106] The lithium salt dissolved in the organic solvent supplies lithium ions in the battery, enables the basic operation of the rechargeable lithium battery, and improves the transport of lithium ions between the positive electrode and the negative electrode. Examples of the lithium salt include those selected from LiPF 6 , LiBF 4 、LiSbF 6 、LiAsF 6 、LiClO 4 、LiAlO 2 、LiAlCl 4 、LiPO 2 F 2 、LiCl、LiI、LiN(SO 3 C 2 F 5 ) 2 、Li(FSO 2 ) 2 N(lithium bis(fluorosulfonyl)imide, LiFSI), LiC 4 F 9 SO 3 、LiN(C x F 2x+1 SO 2 )(C y F 2y+1 SO 2 )(wherein x and y are integers of about 1 to about 20), at least one of lithium trifluoromethanesulfonate, lithium tetrafluoroethanesulfonate, lithium difluorobis(oxalato)phosphate (LiDFBOP) and lithium bis(oxalato)borate (LiBOB).

[0107] Depending on the type (or kind) of the rechargeable lithium battery, the separator may be present between the positive electrode and the negative electrode. The separator may include polyethylene, polypropylene, polyvinylidene fluoride, or a multilayer film of two or more layers thereof and / or a mixed multilayer film (such as a polyethylene / polypropylene double-layer separator, a polyethylene / polypropylene / polyethylene three-layer separator, and / or a polypropylene / polyethylene / polypropylene three-layer separator, etc.).

[0108] The separator may include a porous substrate and a coating layer including an organic material, an inorganic material, or a combination thereof on one or both surfaces (eg, two opposing surfaces) of the porous substrate.

[0109] The porous substrate can be a polymer film formed by any one selected from polyolefins (such as polyethylene and polypropylene), polyesters (such as polyethylene terephthalate and polybutylene terephthalate), polyacetals, polyamides, polyimides, polycarbonates, polyether ketones, polyaryletherketones, polyetherimides, polyamideimides, polybenzimidazoles, polyethersulfones, polyphenylene oxides, cyclic olefin copolymers, polyphenylene sulfide, polyethylene naphthalate, glass fibers, Teflon (TEFLON) and polytetrafluoroethylene, or copolymers or mixtures of two or more thereof.

[0110] The organic material may include a polyvinylidene fluoride-based polymer and / or a (meth)acrylic polymer.

[0111] The inorganic material may include a material selected from Al 2 O 3 、SiO 2 、TiO 2 SnO 2 、CeO 2 , MgO, NiO, CaO, GaO, ZnO, ZrO 2 , Y 2 O 3 、SrTiO 3 、BaTiO 3 Mg(OH) 2 , boehmite or inorganic particles of a combination thereof, but not limited thereto.

[0112] An organic material and an inorganic material may be mixed together in one coating layer, or a coating layer including an organic material and a coating layer including an inorganic material may be stacked.

[0113] Insulation tape

[0114] The rechargeable lithium battery according to some embodiments may further include an insulating tape (e.g., an electrical insulating tape). In some embodiments, the insulating tape may at least partially surround an electrode assembly in which a positive electrode, a separator, and a negative electrode are stacked to be included in the rechargeable lithium battery, or the insulating tape may completely surround the electrode assembly to be included in the rechargeable lithium battery.

[0115] In one or more embodiments, a heat suppression layer may exist between the insulating tape and the battery case or between the insulating tape and the electrode assembly, and this may enable further improvement in battery safety.

[0116] For example, Figure 1A and Figure 1B As shown in FIG. 1 , the insulating tape 15 may completely surround the electrode assembly, and the heat suppression layer 13 according to some embodiments may be on the insulating tape 15 ( Figure 1A ) to insert the electrode assembly into the battery case 50 ( Figure 1B ), the heat suppression layer 13 may be between the insulating tape 15 and the battery case 50. Figure 1A and Figure 1B , the heat suppression layer 13 is shown on a portion of the insulating tape 15, but this only shows a portion of the heat suppression layer to explain the positions of the heat suppression layer and the insulating tape, and the heat suppression layer 13 is not limited to being on only a portion of the insulating tape. Figure 1B The heat suppression layer 13 is shown between the insulating tape 15 and the battery case 50 , but the present disclosure is not limited thereto.

[0117] The insulating tape can be prepared from a polymer having insulating properties (e.g., electrical insulating properties) that can prevent battery short circuits (or reduce the occurrence or possibility of battery short circuits), and the type (or type) of the polymer does not need to be limited, and can be, for example, polyethylene terephthalate, polyimide, or a combination thereof.

[0118] Finishing belt

[0119] The rechargeable lithium battery according to some embodiments may further include a finishing tape partially surrounding the electrode assembly. The finishing tape is used to fix the electrode assembly to prevent or reduce loosening of the electrode assembly during insertion of the electrode assembly into the battery case.

[0120] The finishing tape may be polypyrrolidone, polyethylene terephthalate, polystyrene, oriented polystyrene (OPS), or a combination thereof.

[0121] In one or more embodiments, the heat inhibition layer may be coated on the finishing tape, for example, the heat inhibition layer may be between the finishing tape and the battery case. In an embodiment, if the rechargeable lithium battery includes both an insulating tape and a finishing tape, the finishing tape may contact the battery case, the heat inhibition layer may be between the insulating tape and the finishing tape and / or between the finishing tape and the battery case, and / or between the electrode assembly and the finishing tape.

[0122] Rechargeable lithium batteries can be classified into lithium ion batteries, lithium ion polymer batteries or lithium polymer batteries according to the type (or kind) of separator and electrolyte, can be classified into cylindrical, prismatic, coin or pouch types according to shape, and can be classified into body type or film type according to size. The structure and manufacture of such batteries should be easily recognized by those of ordinary skill in the art after reading this disclosure, and therefore do not need to be described in further detail.

[0123] Rechargeable lithium batteries may be classified into cylindrical batteries, prismatic batteries, pouch-type batteries, coin-type batteries, etc., according to their shapes. Figures 2 to 5 is a schematic diagram illustrating a rechargeable lithium battery according to an embodiment. Figure 2 A cylindrical battery is shown, Figure 3A prismatic cell is shown, Figure 4 and Figure 5 A pouch type battery is shown. Figures 2 to 5 , the rechargeable lithium battery 100 may include an electrode assembly 40 including a separator 30 between a positive electrode 10 and a negative electrode 20, and a case 50 including the electrode assembly 40. The positive electrode 10, the negative electrode 20, and the separator 30 may be impregnated with an electrolyte. Figure 2 As shown in , the rechargeable lithium battery 100 may include a sealing member 60 that seals the housing 50. Figure 3 In the embodiment, the rechargeable lithium battery 100 may include a positive electrode lead tab 11, a positive electrode terminal 12, a negative electrode lead tab 21, and a negative electrode terminal 22. Figure 4 and Figure 5 As shown in FIG. 1 , the rechargeable lithium battery 100 may include an electrode tab 70 ( Figure 5 ), which may be, for example, a positive electrode tab 71 and a negative electrode tab 72 ( Figure 4 ).

[0124] Hereinafter, examples and comparative examples of the present disclosure are described. However, these examples are not to be construed as limiting the scope of the present disclosure in any sense.

[0125] Example 1

[0126] 98.35wt% LiNi 0.88 Co 0.105 Al 0.15 O 2 The positive active material, 0.8 wt % of a polyvinylidene fluoride binder, and 0.85 wt % of a Ketjen black conductive material were mixed together in an N-methylpyrrolidone solvent to prepare a positive active material layer slurry.

[0127] The positive active material layer slurry was coated on an Al foil current collector, dried and pressed to prepare a positive electrode.

[0128] 98 wt % of artificial graphite negative active material, 1 wt % of styrene-butadiene rubber, and 1 wt % of carboxymethyl cellulose were mixed together in a water solvent to prepare a negative active material layer slurry.

[0129] The negative active material layer slurry was coated on a Cu current collector, dried and pressed to prepare a negative electrode under a general technique.

[0130] Preparation of polyethylene / polypropylene double-layer separators.

[0131] An electrode assembly of a negative electrode, a separator, and a positive electrode is prepared.

[0132] 95wt% FeF3 and 5 wt % of a polyvinylidene fluoride binder were mixed together in an N-methylpyrrolidone solvent to prepare a heat inhibition layer composition.

[0133] The heat inhibition layer composition was coated on the electrode assembly and dried to prepare a heat inhibition layer having a thickness of 100 μm.

[0134] The electrode assembly was inserted into an aluminum metal can battery case (thickness: 600 μm) for a prismatic battery cell together with the heat suppression layer, and an electrolyte was injected to manufacture a 151 Ah prismatic battery cell.

[0135] The electrolyte was prepared by mixing 1.5M LiPF 6 The precipitate was dissolved in a mixed solvent of ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate (volume ratio of 20:10:70) for use.

[0136] Example 2

[0137] In addition to using FeF 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound that suppresses heat generation.

[0138] Example 3

[0139] In addition to using CuF 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0140] Example 4

[0141] In addition to using MoCl 5 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0142] Example 5

[0143] In addition to using NiF 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound that suppresses heat generation.

[0144] Example 6

[0145] In addition to using FeCl 3 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0146] Example 7

[0147] In addition to using CoF 3A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0148] Example 8

[0149] In addition to using CoF 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0150] Example 9

[0151] In addition to using MnF 3 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0152] Example 10

[0153] In addition to using NbF 3 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0154] Example 11

[0155] In addition to using TiF 4 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0156] Example 12

[0157] In addition to using ZnF 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0158] Example 13

[0159] In addition to using BiF 3 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0160] Example 14

[0161] In addition to using SeO 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0162] Example 15

[0163] A 151 Ah prismatic battery cell was manufactured through the same procedures as in Example 1 except that CuO was used as the compound for suppressing heat generation.

[0164] Example 16

[0165] In addition to using CuO 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0166] Example 17

[0167] In addition to using P 2 S 5 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0168] Example 18

[0169] In addition to using P 4 S 7 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0170] Example 19

[0171] In addition to using NiS 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0172] Example 20

[0173] In addition to using CoS 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0174] Example 21

[0175] In addition to using FeS 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0176] Example 22

[0177] In addition to using SiS 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0178] Example 23

[0179] In addition to using V 2 O 5 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0180] Example 24

[0181] In addition to using S 8 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0182] Example 25

[0183] 95wt% TiO 2 and 5 wt % of a polyvinylidene fluoride binder were mixed together in an N-methylpyrrolidone solvent to prepare a heat inhibition layer composition.

[0184] The heat inhibition layer composition was coated on the electrode assembly and dried to prepare a heat inhibition layer having a thickness of 150 μm.

[0185] The electrode assembly was inserted into an aluminum metal can battery case (thickness: 600 μm) for a prismatic battery cell together with the heat suppression layer, and an electrolyte was injected to manufacture a 151 Ah prismatic battery cell.

[0186] Example 26

[0187] In addition to using Co 3 O 4 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 25 except for the compound that suppresses heat generation.

[0188] Example 27

[0189] In addition to using MoO 3 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 25 except for the compound that suppresses heat generation.

[0190] Example 28

[0191] In addition to using MnO 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 25 except for the compound that suppresses heat generation.

[0192] Example 29

[0193] In addition to using Fe 2 O 3 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 25 except for the compound that suppresses heat generation.

[0194] Example 30

[0195] 47.5wt% TiO 2 , 47.5wt% FeF 3and 5 wt % of a polyvinylidene fluoride binder were mixed together in an N-methylpyrrolidone solvent to prepare a heat inhibition layer composition.

[0196] The heat inhibition layer composition was coated on the electrode assembly and dried to prepare a heat inhibition layer having a thickness of 200 μm.

[0197] The electrode assembly was inserted into an aluminum metal can battery case (thickness: 600 μm) for prismatic batteries together with the heat suppression layer, and an electrolyte was injected to manufacture a 151 Ah prismatic battery cell.

[0198] The electrolyte was prepared by mixing 1.15M LiPF 6 The polyol was dissolved in a mixed solvent of ethylene carbonate, ethyl methyl carbonate, and dimethyl carbonate (volume ratio: 20:20:40) for use.

[0199] Example 31

[0200] In addition to using 47.5wt% TiO 2 and 47.5wt% FeF 2 Otherwise, a 151 Ah prismatic battery cell was manufactured through the same process as in Example 30.

[0201] Example 32

[0202] In addition to using 47.5wt% Co 3 O 4 and 47.5wt% FeF 3 Otherwise, a 151 Ah prismatic battery cell was manufactured in the same process as in Example 30.

[0203] Example 33

[0204] In addition to using 47.5wt% Co 3 O 4 and 47.5wt% FeF 2 Otherwise, a 151 Ah prismatic battery cell was manufactured in the same process as in Example 30.

[0205] Example 34

[0206] In addition to using 47.5wt% MoO 3 and 47.5wt% FeF 3 Otherwise, a 151 Ah prismatic battery cell was manufactured in the same process as in Example 30.

[0207] Example 35

[0208] In addition to using 47.5wt% MoO 3 and 47.5wt% FeF2 Otherwise, a 151 Ah prismatic battery cell was manufactured in the same steps as in Example 30.

[0209] Example 36

[0210] In addition to using 47.5wt% MnO 2 and 47.5wt% FeF 3 Otherwise, a 151 Ah prismatic battery cell was manufactured in the same process as in Example 30.

[0211] Example 37

[0212] In addition to using 47.5wt% MnO 2 and 47.5wt% FeF 2 Otherwise, a 151 Ah prismatic battery cell was manufactured in the same process as in Example 30.

[0213] Example 38

[0214] In addition to using 47.5wt% Fe 2 O 3 and 47.5wt% FeF 3 Otherwise, a 151 Ah prismatic battery cell was manufactured through the same process as in Example 30.

[0215] Example 39

[0216] In addition to using 47.5wt% Fe 2 O 3 and 47.5wt% FeF 2 Otherwise, a 151 Ah prismatic battery cell was manufactured in the same process as in Example 30.

[0217] Comparative Example 1

[0218] A 151 Ah prismatic battery cell was manufactured through the same procedures as in Example 1, except that the heat suppression layer was not formed.

[0219] Comparative Example 2

[0220] In addition to using TiO 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0221] Comparison Example 3

[0222] In addition to using Co 3 O 4 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0223] Comparison Example 4

[0224] In addition to using MoO 3 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0225] Comparative Example 5

[0226] In addition to using MnO 2 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0227] Comparative Example 6

[0228] In addition to using Fe 2 O 3 A 151 Ah prismatic battery cell was manufactured through the same process as that in Example 1 except for the compound for suppressing heat generation.

[0229] Experimental Example 1) Penetration Test

[0230] The 151Ah prismatic battery cells according to Examples 1 to 39 and Comparative Examples 1 to 6 were charged with a current of 0.33C and cut off at a voltage of 4.25V, and then, under a constant voltage condition (4.25V constant voltage), the battery cells were charged until the current dropped to 1 / 20C at SOC 100 (if the battery cells were charged, they were charged to 100% of the charge capacity based on the total charge capacity of the battery cells).

[0231] A pin having a diameter of 5 mm was used to completely penetrate the center of the battery cell at a speed of 150 mm / s. The maximum exothermic temperature occurring during the penetration was measured. The results are shown in Table 1.

[0232] Table 1

[0233]

[0234]

[0235] As shown in Table 1, the maximum exothermic temperature of Examples 1 to 39 was 783° C. or less (significantly lower than 1654° C. of Comparative Example 1 having no heat suppression layer), showing excellent stability. In Comparative Examples 2 to 6, the maximum exothermic temperature was 1008° C. to 1032° C. (slightly lower than the maximum exothermic temperature of Comparative Example 1, but significantly higher than the maximum exothermic temperature of the examples), showing poor stability.

[0236] While the subject matter of the present disclosure has been described in conjunction with what are presently considered to be practical example embodiments, it will be understood that the disclosure is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims and their equivalents.

Claims

1. A rechargeable lithium battery, comprising: Electrode assembly; A battery housing, accommodating the electrode assembly; as well as a heat suppression layer between the electrode assembly and the battery case, Wherein, the thermal inhibition layer includes a compound that inhibits heat generation, and the compound is selected from FeF3, FeF2, CuF2, MoCl5, NiF2, FeCl3, CoF3, CoF2, MnF3, NbF3, TiF4, ZnF2, BiF3, SeO2, CuO, CuO2, P2S5, P4S7, NiS2, CoS2, FeS2, SiS2, V2O5, S8 or a combination thereof.

2. The rechargeable lithium battery according to claim 1, wherein The compound that suppresses heat generation includes FeF3.

3. The rechargeable lithium battery according to claim 1, wherein The amount of the compound suppressing heat generation is 1 wt % to 99 wt % based on 100 wt % of the heat suppression layer.

4. The rechargeable lithium battery according to claim 1, wherein The heat suppression layer has a thickness of 2 μm to 600 μm.

5. The rechargeable lithium battery according to claim 1, wherein The rechargeable lithium battery is a can battery.

6. The rechargeable lithium battery according to claim 1, wherein: The rechargeable lithium battery includes an insulating tape between the electrode assembly and the battery case, and the heat suppression layer is coated on the insulating tape to be located between the insulating tape and the battery case, or between the electrode assembly and the insulating tape.

7. The rechargeable lithium battery according to claim 1, wherein: The rechargeable lithium battery further includes an insulating tape surrounding the electrode assembly, and the heat suppression layer is between the insulating tape and the battery case, or between the electrode assembly and the insulating tape.

8. The rechargeable lithium battery according to claim 1, wherein: The rechargeable lithium battery also includes a finishing tape surrounding the electrode assembly, and the heat inhibition layer is between the finishing tape and the battery case.

9. The rechargeable lithium battery according to claim 1, wherein: The rechargeable lithium battery also includes a finishing tape surrounding the electrode assembly, and the heat inhibition layer is between the electrode assembly and the finishing tape.

10. A rechargeable lithium battery, comprising: Electrode assembly; A battery housing, accommodating the electrode assembly; as well as a heat suppression layer between the electrode assembly and the battery case, Wherein, the heat suppression layer includes a compound that suppresses heat generation, and the compound is selected from TiO2, Co3O4, MoO3, MnO2, Fe2O3 or a combination thereof.

11. The rechargeable lithium battery according to claim 10, wherein: The heat suppression layer has a thickness of 150 μm to 600 μm.

12. The rechargeable lithium battery according to claim 10, wherein: The amount of the compound suppressing heat generation is 1 wt % to 99 wt % based on 100 wt % of the heat suppression layer.

13. The rechargeable lithium battery according to claim 10, wherein: The compound that suppresses heat generation includes TiO2.

14. The rechargeable lithium battery according to claim 10, wherein: The thickness of the heat inhibition layer is 25% to 100% based on the thickness of the battery case.

15. A rechargeable lithium battery, comprising: Electrode assembly; A battery housing, accommodating the electrode assembly; as well as a heat suppression layer between the electrode assembly and the battery case, Wherein, the thermal inhibition layer includes a first compound for inhibiting heat generation and a second compound for inhibiting heat generation, the first compound is selected from TiO2, Fe2O3, MnO2, Co3O4, MoO3 or a combination thereof, and the second compound is selected from FeF3, FeF2, CuF2, MoCl5, NiF2, FeCl3, CoF3, CoF2, MnF3, NbF3, TiF4, ZnF2, BiF3, SeO2, CuO, CuO2, P2S5, P4S7, NiS2, CoS2, FeS2, SiS2, V2O5, S8 or a combination thereof.

16. The rechargeable lithium battery according to claim 15, wherein: The mixing ratio of the first compound that suppresses heat generation and the second compound that suppresses heat generation is 95:5 by weight to 5:95 by weight.

17. The rechargeable lithium battery according to claim 15, wherein: The amount of the first compound suppressing heat generation is 0.4 wt % to 94.5 wt % based on 100 wt % of the heat suppression layer.

18. The rechargeable lithium battery according to claim 15, wherein: The amount of the second compound suppressing heat generation is 0.4 wt % to 94.5 wt % based on 100 wt % of the heat suppression layer.

19. The rechargeable lithium battery according to claim 15, wherein: The first compound that suppresses heat generation includes TiO2.

20. The rechargeable lithium battery according to claim 15, wherein: The heat suppression layer has a thickness of 2 μm to 600 μm.

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