Cylindrical lithium secondary battery

Abstract

The present invention relates to a lithium secondary battery comprising: an electrode assembly comprising a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; an electrolyte; and a battery case for receiving the electrode assembly and the electrolyte therein, wherein the electrolyte comprises a lithium salt and an organic solvent, and a P value defined by formula 1 below is less than 8.7. In formula 1, H (unit: mm) means the height of the lithium secondary battery, R (unit: mm) means the diameter of the lithium secondary battery, ta (unit: μm) means the thickness of the negative electrode, La (unit: g / 25 cm2) means the loading amount of the negative electrode, Pa (unit: %) means the porosity of the negative electrode, and Vc (unit: cm3) means the volume of an empty space inside the lithium secondary battery.

Description

Cylindrical lithium secondary battery Cross-citation with related applications This application claims the benefit of priority to Korean Patent Application No. 10-2023-0190175, filed December 22, 2023, and Korean Patent Application No. 10-2024-0191913, filed December 19, 2024, the entire contents of which are incorporated herein by reference. Technical field The present invention relates to a cylindrical lithium secondary battery, and more specifically, to a cylindrical lithium secondary battery having excellent rapid charging characteristics. With the advancement of technology in electric vehicles, portable electronic devices, etc., the demand for lithium secondary batteries as an energy source is rapidly increasing. Lithium secondary batteries can be classified into cylindrical, square, and pouch-type batteries depending on the shape of the battery case. Among these, a cylindrical battery is manufactured by sequentially stacking a sheet-shaped positive electrode, a separator, and an anode in a cylindrical battery case, and then winding them in one direction to accommodate a jelly-roll-type electrode assembly, and then covering the top of the battery case with a cap plate to seal it. The positive and negative electrodes are each provided with a strip-shaped positive electrode tab and a negative electrode tab, and the positive and negative electrode tabs are connected to electrode terminals and electrically connected to an external power source. For reference, the positive electrode terminal is a cap plate, and the negative electrode terminal is a battery case. In particular, as the demand for high-capacity batteries has increased due to the recent development of electric vehicle technology, the development and use of large-volume, large-sized cylindrical secondary batteries are being reviewed. In the case of small-sized cylindrical batteries that were commonly used in the past, that is, cylindrical secondary batteries with form factors of 1865 or 2170, high rapid charging performance was not required. In contrast, for large cylindrical secondary batteries, rapid charging characteristics are becoming very important because they are applied to electric vehicles. However, when rapid charging is performed at high voltage and high C-rate, the electrolyte may decompose rapidly, generating a large amount of gases such as CO2 and CH4, and the pressure inside the battery may increase due to the generated gases. As the electrolyte is pushed out by the increased internal pressure of the battery, the electrolyte becomes localized, and the lithium ions moved through the localized electrolyte are concentrated in a specific negative electrode region, causing the lithium ions that were not inserted into the negative electrode to be precipitated on the negative electrode surface, which causes the lithium plating phenomenon. As a result, the lithium plating phenomenon can lead to deterioration or ignition of the battery, which has a negative impact on the life and safety of the battery. Therefore, there is a need to develop a lithium secondary battery with excellent rapid charging performance that prevents lithium plating phenomenon during rapid charging and improves the life characteristics and safety of the battery. The present invention is intended to solve the above problems, and to provide a cylindrical lithium secondary battery having excellent life characteristics and stability by preventing lithium plating phenomenon during rapid charging. [1] The present invention provides a cylindrical lithium secondary battery comprising an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; an electrolyte; and a battery case in which the electrode assembly and the electrolyte are accommodated, wherein the electrolyte includes a lithium salt and an organic solvent, and has a P value defined by the following formula 1 of less than 8.7. [Formula 1] In the above equation 1, H (unit: mm) means the height of the lithium secondary battery, R (unit: mm) means the diameter of the lithium secondary battery, and t a (Unit: ㎛) indicates the cathode thickness, and L a (Unit: g / 25cm2 ) represents the negative loading, and P a (Unit: %) means cathode porosity, V c (Unit: cm 3 ) refers to the volume of empty space inside a lithium secondary battery. [2] The present invention provides a cylindrical lithium secondary battery having a P value represented by the above formula 1 of 7.4 to 8.6 in the above [1]. [3] The present invention, in the above [1] or [2], the V c is 17.5cm 3 25cm inside 3 A cylindrical lithium secondary battery is provided. [4] The present invention, in at least one of the above [1] to [3], the volume (V) of the empty space inside the lithium secondary battery relative to the total volume (V) of the space inside the battery case c ) of the ratio (V) c / V) provides a cylindrical lithium secondary battery having a V of 0.08 to 0.25. [5] The present invention provides a cylindrical lithium secondary battery, wherein, in at least one of the above [1] to [4], the ratio of H to R (R / H) is 0.4 or more. [6] The present invention, in at least one of the above [1] to [5], the P a Provides a cylindrical lithium secondary battery having a V / V ratio of 23.5% or higher. [7] The present invention, in at least one of the above [1] to [6], the L a is 0.25g / 25cm 2 0.45g / 25cm 2 A cylindrical lithium secondary battery is provided. [8] The present invention, in at least one of the above [1] to [7], the t a Provides a cylindrical lithium secondary battery having a diameter of 180 μm to 200 μm. [9] The present invention provides a cylindrical lithium secondary battery, wherein in at least one of the above [1] to [8], the negative electrode includes a negative electrode active material layer including a negative electrode active material, and the negative electrode active material includes a carbon-based active material.

[0010] The present invention provides a cylindrical lithium secondary battery, wherein in at least one of the above [1] to [9], the negative electrode includes a negative electrode active material layer including a negative electrode active material, and the negative electrode active material is included in an amount of 90 to 99 wt% based on the total weight of the negative electrode active material layer.

[0011] The present invention provides a cylindrical lithium secondary battery, wherein, in at least one of the above [1] to

[0010] , the concentration of the lithium salt is 1.0 M to 1.5 M.

[0012] The present invention provides a cylindrical lithium secondary battery, wherein in at least one of the above [1] to

[0011] , the lithium salt includes at least one selected from the group consisting of LiPF6, LiClO4, LiAsF6, LiBF4, LiSbF6, LiAlO4, LiAlCl4, LiCF3SO3, LiC4F9SO3, LiN(C2F5SO3)2, LiN(C2F5SO2)2, LiN(CF3SO2)2, LiCl, and LiI.

[0013] The present invention provides a cylindrical lithium secondary battery, wherein in at least one of the above [1] to

[0012] , the organic solvent includes at least one selected from the group consisting of a cyclic carbonate-based organic solvent, a linear carbonate-based organic solvent, a linear ester-based organic solvent, and a cyclic ester-based organic solvent.

[0014] The present invention provides a cylindrical lithium secondary battery, wherein in at least one of the above [1] to

[0013] , the cylindrical lithium secondary battery is a 46110 cell, a 48110 cell, a 4880 cell or a 4680 cell.

[0015] The present invention provides a cylindrical lithium secondary battery, wherein, in at least one of the above [1] to

[0014] , the cylindrical lithium secondary battery includes a non-conductive portion in which an active material layer is not formed on at least a portion of the positive electrode and the negative electrode, and the non-conductive portion of the positive electrode and the non-conductive portion of the negative electrode are defined as electrode tabs.

[0016] The present invention provides a cylindrical lithium secondary battery, wherein, in the above

[0015] , the positive electrode non-coated portion and the negative electrode non-coated portion are formed along the direction in which the electrode assembly is wound on one end of each of the positive and negative electrodes, and a current collecting plate is coupled to each of the positive electrode non-coated portion and the negative electrode non-coated portion, and the current collecting plate is connected to an electrode terminal.

[0017] The present invention provides a cylindrical lithium secondary battery, wherein in the above

[0015] or

[0016] , the positive and negative electrode non-conductive parts are processed into a plurality of independently foldable segments, and at least some of the plurality of segments are folded toward the winding center of the electrode assembly.

[0018] The present invention provides a cylindrical lithium secondary battery, wherein at least some of the plurality of folded segments in the above

[0017] overlap on the upper and lower sides of the electrode assembly, and the current collecting plate is bonded on the plurality of overlapped segments.

[0019] The present invention provides a battery pack including a cylindrical lithium secondary battery according to any one of [1] to

[0018] as a unit cell. The cylindrical lithium secondary battery according to the present invention suppresses the phenomenon of electrolyte localization due to an increase in internal pressure of the battery even when gas is generated due to decomposition of electrolyte, etc. during rapid charging by making the form factor, the volume of the empty space inside the battery, and the negative electrode satisfy specific conditions, thereby preventing lithium ions moving during the charge and discharge process from being concentrated in a specific negative electrode region. Accordingly, the lithium plating phenomenon can be reduced, thereby improving the life characteristics and safety of the battery during rapid charging. Figure 1 is a drawing showing a state of lamination before winding of an electrode assembly according to the present invention. FIG. 2 is a cross-sectional view showing the structure of an electrode of an electrode assembly according to one embodiment of the present invention. FIG. 3 is a drawing for explaining the structure of an electrode assembly according to one embodiment of the present invention. FIG. 4 is a cross-sectional view showing the structure of a cylindrical lithium secondary battery according to one embodiment of the present invention. FIG. 5 is a cross-sectional view showing the structure of a cylindrical lithium secondary battery according to another embodiment of the present invention. Figure 6 is a drawing for explaining a battery pack according to the present invention. Hereinafter, the present invention will be described in more detail. The terms or words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as having meanings and concepts consistent with the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the concept of the term in order to explain his or her own invention in the best manner. The terminology used in this specification is for the purpose of describing exemplary embodiments only and is not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, it should be understood that the terms “include,” “comprising,” or “having” are intended to specify the presence of a feature, number, step, component, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, components, or combinations thereof. In the present invention, “cathode loading amount (L a , unit: g / 25cm 2 )” is 25cm 2 This refers to the mass (g) of the negative electrode active material layer included per area. After stamping the negative electrode to a size of 5 cm × 5 cm, the weight W1 of the stamped area and the weight W2 of the negative electrode current collector are measured. If the negative electrode active material layer is formed on both sides of the negative electrode current collector, it can be obtained by substituting it into the following [Formula A-1], and if the negative electrode active material layer is formed on one side of the negative electrode current collector, it can be obtained by substituting it into the following [Formula A-2]. [Formula A-1] Cathode loading amount L a (g / 25cm 2 ) = (W1-W2) / 2 [Formula A-2] Cathode loading amount L a (g / 25cm 2 ) = (W1-W2) In the present invention, “the volume (V) of the empty space inside a lithium secondary battery c , unit: cm 3 )” means the space inside the battery case of a lithium secondary battery excluding the space occupied by the electrolyte and electrode assembly, and specifically, it may be measured after performing an activation process after manufacturing a lithium secondary battery, but is not limited thereto. The above activation refers to a process of charging and / or discharging a lithium secondary battery that has been manufactured but has not been charged or discharged to provide electrical characteristics and forming a solid electrolyte interphase (SEI) film on the electrode to stabilize the battery, thereby making the battery ready for actual use. Above V C In relation to this, the activation may be performed by performing the process of charging the lithium secondary battery to a voltage of 4.0 V or higher at 25°C and discharging to a voltage of 2.5 V or lower at least once, but is not limited thereto. The above “volume of empty space inside a lithium secondary battery (V c , unit: cm 3 )” is the dead volume V inside the battery case in a lithium secondary battery. d , pore volume V p , and the volume V of the electrolyte e After measuring, it can be measured by substituting it into [Formula B] below. [Formula B] Volume V of empty space inside a lithium secondary battery c (cm 3 ) = V d +V p -V e Specifically, in the above formula B, the undissolved volume V inside the battery case drefers to the volume of a cylindrical lithium secondary battery excluding the volume occupied by the electrode assembly and the volume occupied by the battery case. The volume of the cylindrical lithium secondary battery is a volume measured based on the external shape of the cylindrical lithium secondary battery, and specifically refers to the volume of the space occupied by the external shape of the cylindrical lithium secondary battery. At this time, the internal space of the cylindrical lithium secondary battery may be measured without considering it. At this time, the external shape of the lithium secondary battery may be the same as the external shape of the battery case when the battery case is sealed. The volume occupied by the above electrode assembly means the total volume occupied by the cathode, anode, and separator included in the electrode assembly. At this time, the volume occupied by the electrode assembly can be measured based on the external shape of the cathode, anode, and separator without considering the volume of the pores included in the cathode, anode, and separator. The volume occupied by the above battery case refers to the volume of the space physically occupied by the battery case itself, and includes only the structural part of the battery case itself excluding the internal space of the battery case, and can be measured based on the external appearance of the battery case. The above void volume V p The void volume of the cathode and the anode can be measured by adding the void volume of the separator interposed between the anode and the cathode, and specifically, the void volume of the cathode and the anode can be measured by adding the void volume of the separator and the SRS coating layer interposed between the anode and the cathode. At this time, the void volume of each of the anode, the cathode, the separator, and the SRS coating layer can be obtained by multiplying the respective volumes of the anode, the cathode, the separator, and the SRS coating layer by their respective porosities. The volume V of the above electrolyte emeans the volume of the electrolyte impregnated in the internal gap of the electrode assembly; and the volume of the electrolyte located outside the electrode assembly in the internal space of the battery case; Specifically, the V e can be calculated by dividing the weight of the electrolyte by the density of the electrolyte. The weight of the above electrolyte is (1) the weight of the lithium secondary battery after activation, including the electrode assembly, electrolyte and battery case, with the battery case sealed (M L ), (2) a step of disassembling the lithium secondary battery to remove the electrolyte present in the battery case, (3) a step of immersing the battery case and the electrode assembly in a solvent such as dimethyl carbonate to remove the electrolyte present on the surface of the battery case, the surface of the electrode assembly, and the internal pores, and then drying the battery case and the electrode assembly, (4) a step of measuring the weight (M) of the dried battery case. C ) and the weight (M) of the dried electrode assembly A ) After going through the step of measuring the measured M L , M C , M A It can be measured by substituting it into Equation B-1. [Formula B-1] Weight of electrolyte = M L -M C -M A In this specification, “cathode porosity” can be calculated by the following [Formula C]. [Formula C] Porosity (%) = {1-(density of negative electrode active material layer / true density of negative electrode active material layer)} × 100 In the above formula C, the true density of the negative electrode active material layer is a calculated density derived from the density and mass ratio of each component material forming the negative electrode active material layer under the assumption that no pores are included, and the density of the negative electrode active material layer is a measured density of the negative electrode active material layer measured by sampling the negative electrode active material layer to a certain size. The inventors of the present invention have conducted repeated studies to develop a lithium secondary battery capable of suppressing lithium plating phenomenon during rapid charging and improving life characteristics and safety. As a result, they have found that when the form factor, the volume of empty space inside the battery, and the negative electrode satisfy specific conditions, the lithium plating phenomenon can be minimized by suppressing electrolyte localization due to gas generated during rapid charging, thereby improving the rapid charging life characteristics and safety, thereby completing the present invention. A cylindrical lithium secondary battery according to the present invention comprises at least one of the configurations disclosed below, and may comprise any combination between technically possible configurations among the configurations below. Hereinafter, the present invention will be described in more detail. Cylindrical lithium secondary battery A cylindrical lithium secondary battery according to the present invention is a cylindrical lithium secondary battery comprising an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; an electrolyte; and a battery case in which the electrode assembly and the electrolyte are accommodated, wherein the electrolyte includes a lithium salt and an organic solvent, and has a P value defined by the following formula 1 of less than 8.7. [Formula 1] In the above equation 1, H (unit: mm) means the height of the lithium secondary battery, R (unit: mm) means the diameter of the lithium secondary battery, and t a (Unit: ㎛) indicates the cathode thickness, and L a (Unit: g / 25cm 2 ) represents the negative loading, and Pa (Unit: %) means cathode porosity, V c (Unit: cm 3 ) refers to the volume of empty space inside a lithium secondary battery. The cylindrical lithium secondary battery according to the present invention has a P value defined by the above formula 1 of less than 8.7, specifically, less than 8.7, 8.6 or less, 8.5 or less, 8.4 or less, 8.3 or less, 8.2 or less, 8.1 or less, 8.0 or less, 7.9 or less, 7.8 or less, 7.7 or less, 7.6 or less, or 7.5 or less, and may be 5 or more, 5.2 or more, 5.4 or more, 5.6 or more, 5.8 or more, 6 or more, 6.2 or more, 6.4 or more, 6.6 or more, 6.8 or more, 7 or more, 7.1 or more, 7.2 or more, 7.3 or more, 7.4 or more, or 7.5 or more. For example, the P value defined by the above formula 1 can be less than 8.7, between 5 and 8.6, between 7.4 and 8.5, between 7.4 and 8, or between 7.4 and 7.7. Recently, with the development of electric vehicle technology, the rapid charging characteristics of lithium secondary batteries are very important in order to meet the demands of increased driving distance and fast charging speed. During the rapid charging process of lithium secondary batteries, when high voltage and / or high rate charging and discharging are repeated, lithium ions that are not inserted into the negative active material are precipitated and exist on the surface of the negative electrode in the form of Li2CO3, etc., which intensifies the side reactions of the electrolyte, causing a large amount of gas such as CO2 and CH4 to be generated inside the battery. The generated gas moves to the empty space inside the battery, and when the empty space inside the battery is insufficient to relieve the pressure caused by the generated gas, the electrolyte is squeezed due to the pressure caused by the gas, resulting in the phenomenon of electrolyte localization. As a result, the electrolyte does not contact the positive and negative electrodes evenly and is concentrated in a specific area, and the lithium ions do not move evenly and are concentrated in a specific area, leading to the lithium plating phenomenon in which lithium ions that are not accepted by the negative electrode are precipitated on the surface of the negative electrode. Lithium plating phenomenon causes capacity loss in lithium secondary batteries, deteriorates lithium secondary batteries, reduces life characteristics, and leads to additional electrolyte side reactions, further reducing the performance of lithium secondary batteries. In addition, lithium plating phenomenon can damage the separator, causing internal short circuits in the battery and causing explosion or ignition of the battery, which can affect battery safety. In order to solve the above problem, the cylindrical lithium secondary battery according to the present invention has the form factor, the volume of the empty space inside the battery, and the characteristics of the negative electrode simultaneously controlled to specific conditions. Specifically, the cylindrical lithium secondary battery according to the present invention has a P value defined by the above formula 1 less than 8.7, so as to secure a sufficient volume of empty space inside the battery to accommodate gas generated during rapid charging and relieve pressure, while sufficiently impregnating the negative electrode with electrolyte to control the characteristics of the negative electrode so that lithium ions can move smoothly, and optimize the characteristics of the negative electrode and the volume of empty space inside the battery according to the shape of the battery case by the form factor. Therefore, when the P value defined by the above equation 1 is less than 8.7, the electrolyte localization and lithium plating phenomenon caused by gas generated during rapid charging can be improved, thereby improving the rapid charging life characteristics and safety. In addition, when the P value defined by the above formula 1 is 7.4 to 8.6, the life characteristics and safety may be improved during rapid charging, while at the same time the initial resistance characteristics and capacity characteristics may be excellent. This may occur when the negative electrode loading amount or the negative electrode thickness is excessively reduced, or the negative electrode porosity or the volume of empty space inside the battery is excessively increased, the amount of lithium ions that can be accommodated in the negative electrode is reduced, or the amount of electrolyte through which lithium ions can move is reduced. The volume V of the empty space inside the above lithium secondary battery c is 17.5cm 3 25cm inside 3 , 18cm 3 Inside 23cm 3 , 18.5cm 3 Inside 21.5cm 3 , or 19.7cm 3 Inside 20.5cm 3 The volume V of the empty space inside the lithium secondary battery may be c When the above range is satisfied, the pressure caused by gas generated during rapid charging can be reduced, thereby suppressing the electrolyte localization phenomenon, and thereby improving the lithium plating phenomenon and rapid charging life characteristics. The volume of empty space inside a lithium secondary battery (V) relative to the total volume of the space inside the battery case (V) c ) of the ratio (V) c / V) may be 0.08 to 0.25, preferably 0.1 to 0.22, more preferably 0.11 to 0.20, 0.13 to 0.18, or 0.15 to 0.17. When the volume ratio of the empty space inside the lithium secondary battery satisfies the above range, the pressure caused by gas generation can be relieved, thereby improving the rapid charging characteristics. The diameter R of the above lithium secondary battery may be 40 mm or more, 42 mm or more, or 46 mm or more, and the height H of the above lithium secondary battery may be 70 mm or more, 75 mm or more, or 80 mm or more. When the above ranges are satisfied, excellent capacity characteristics can be implemented. The diameter of the above lithium secondary battery refers to the diameter of the external shape of the lithium secondary battery and may be the same as the diameter of the outside of the battery case. The height of the above lithium secondary battery refers to the height of the external shape of the lithium secondary battery and may be the same as the height of the outside of the battery case. The ratio of the height H of the lithium secondary battery to the diameter R of the lithium secondary battery (R / H, form factor ratio) may be 0.4 or more, 0.4 to 0.6, or 0.5 to 0.6. When the range of the form factor ratio is satisfied, a high-capacity characteristic can be implemented as a large-sized cylindrical lithium secondary battery. The above negative loading amount L a is 0.25g / 25cm 2 0.45g / 25cm 2 , 0.3g / 25cm 2 0.4g / 25cm 2 , 0.32g / 25cm 2 0.38g / 25cm 2 , or 0.33g / 25cm 2 0.37g / 25cm 2It can be done. When the above range of negative electrode loading is satisfied, the capacity characteristics and life characteristics can be improved. The above cathode porosity P a The negative electrode porosity may be 23.5% or more, 23.5% to 27.0%, 24.0 to 26.5%, or 25.0% to 26.0%. When the above range of negative electrode porosity is satisfied, the energy density, capacity characteristics, and electrolyte impregnation properties can be simultaneously improved. The above cathode thickness t a The thickness of the cathode may be 180 μm to 200 μm, 185 μm to 195 μm, or 189 μm to 192 μm. When the above range of cathode thickness is satisfied, both capacity characteristics and life characteristics can be improved. Next, each component of the cylindrical lithium secondary battery according to the present invention will be described in more detail. A cylindrical lithium secondary battery according to the present invention comprises an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; an electrolyte; and a battery case in which the electrode assembly and the electrolyte are accommodated. (1) Electrode assembly An electrode assembly according to the present invention includes an anode, a cathode, and a separator interposed between the anode and the cathode. FIG. 1 illustrates a pre-wound laminated structure of an electrode assembly according to one embodiment of the present invention, FIG. 2 illustrates a cross-sectional structure of an electrode plate (positive electrode or negative electrode) according to one embodiment of the present invention, and FIG. 3 illustrates a structure of an electrode assembly according to one embodiment of the present invention. Referring to FIGS. 1 and 2, the electrode assembly (A) of the present invention can be manufactured by winding a laminate formed by sequentially stacking a separator (12), an anode (10), a separator (12), and a cathode (11) at least once in one direction (X). Hereinafter, each component of the electrode assembly of the present invention will be described in more detail. 1) Bipolar The above positive electrode can be manufactured by a method of applying positive electrode slurry to one side or both sides of a sheet-shaped positive electrode collector, removing the solvent of the positive electrode slurry through a drying process, and then rolling. Meanwhile, a positive electrode including a non-coated region can be manufactured by a method of not applying the positive electrode slurry to some area of ​​the positive electrode collector, for example, one end of the positive electrode collector, during the application of the positive electrode slurry. In addition, the cathode slurry can be prepared by dispersing the cathode material according to the present invention in a solvent such as dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, or water. The cathode manufactured thus includes a cathode current collector; and a cathode active material layer; and the cathode active material layer may include a cathode active material. As the positive electrode collector, various positive electrode collectors used in the relevant technical field can be used. For example, as the positive electrode collector, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel surface-treated with carbon, nickel, titanium, silver, etc. can be used. The positive electrode collector can typically have a thickness of 3 to 500 ㎛, and fine unevenness can be formed on the surface of the positive electrode collector to increase the adhesion of the positive electrode active material. The positive electrode collector can be used in various forms, such as a film, a sheet, a foil, a net, a porous body, a foam, a non-woven fabric, etc. The above-mentioned positive electrode active material layer may be positioned on the positive electrode current collector, and specifically, may be positioned on one side or both sides of the positive electrode current collector. The above-mentioned positive electrode active material layer may have a single layer or a multilayer structure of two or more layers. The above cathode active material may be cathode active materials generally used in the relevant technical field, and the type thereof is not particularly limited. The above cathode active material is a compound capable of reversible intercalation and deintercalation of lithium, and specifically, may include a lithium-transition metal composite oxide including lithium and at least one transition metal composed of nickel, cobalt, manganese, and aluminum, preferably a lithium-transition metal composite oxide including lithium and a transition metal including nickel, cobalt, and manganese. More specifically, the lithium transition metal composite oxides include lithium-manganese oxides (e.g., LiMnO2, LiMn2O4, etc.), lithium-cobalt oxides (e.g., LiCoO2, etc.), lithium-nickel oxides (e.g., LiNiO2, etc.), lithium-nickel-manganese oxides (e.g., LiNi 1-Y Mn Y O2(here, 0 <Y<1), LiMn 2-z Ni z O4 (wherein, 0<Z<2) etc.), lithium-nickel-cobalt oxides (e.g., LiNi 1-Y1 Co Y1 O2(here, 0 <Y1<1) 등), 리튬-망간-코발트계 산화물(예를 들면, LiCo 1-Y2 Mn Y2 O2(here, 0 <Y2<1), LiMn 2-z1 Co z1 O4 (wherein, 0<Z1<2) etc.), lithium-nickel-manganese-cobalt oxides (e.g., Li(Ni p Co q Mn r1 )O2(where, 0<p<1, 0<q<1, 0<r1<1, p+q+r1=1) or Li(Ni p1 Co q1 Mn r2 )O4 (wherein, 0<p1<2, 0<q1<2, 0<r2<2, p1+q1+r2=2) etc.), or lithium-nickel-cobalt-transition metal(M) oxide (e.g., Li(Ni p2 Co q2Mn r3 M S2 )O2(wherein, M is selected from the group consisting of Al, Fe, V, Cr, Ti, Ta, Mg and Mo, and p2, q2, r3 and s2 are atomic fractions of independent elements, 0<p2<1, 0<q2<1, 0<r3<1, 0<s2<1, p2+q2+r3+s2=1), etc.), and one or more compounds of these may be included. Among these, the lithium transition metal composite oxide may be LiCoO2, LiMnO2, LiNiO2, lithium nickel-manganese-cobalt oxide (for example, Li(Ni 0.6 Mn 0.2 Co 0.2 )O2, Li(Ni 0.5 Mn 0.3 Co 0.2 )O2, Li(Ni 0.7 Mn 0.15 Co 0.15 )O2 or Li(Ni 0.8 Mn 0.1 Co 0.1 )O2, etc.), or lithium nickel cobalt aluminum oxide (e.g., Li(Ni 0.8 Co 0.15 Al 0.05 )O2, etc.), and considering the remarkable improvement effect according to the control of the type and content ratio of the constituent elements forming the lithium transition metal composite oxide, the lithium transition metal composite oxide may be Li(Ni 0.6 Mn 0.2 Co 0.2 )O2, Li(Ni 0.5 Mn 0.3 Co 0.2 )O2, Li(Ni 0.7 Mn 0.15 Co 0.15 )O2 or Li(Ni 0.8 Mn 0.1 Co 0.1 )O2, etc., and one or a mixture of two or more of these may be used. Meanwhile, the positive electrode active material layer may optionally further include at least one of a positive electrode conductive material and a positive electrode binder. The above-described positive electrode conductive material is used to provide conductivity to the electrode, and in the battery to be formed, as long as it does not cause a chemical change and has electronic conductivity, it can be used without special restrictions. Specific examples include graphite such as natural graphite or artificial graphite; carbon-based materials such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, summer black, carbon fiber, and carbon nanotube; metal powder or metal fiber such as copper, nickel, aluminum, and silver; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; or conductive polymers such as polyphenylene derivatives, and the like, and one of these may be used alone or a mixture of two or more may be used. The above-described positive electrode conductive material may be typically included in an amount of 1 to 30 wt%, preferably 1 to 20 wt%, and more preferably 1 to 10 wt%, based on the total weight of the positive electrode active material layer. The above positive electrode binder serves to improve the adhesion between positive electrode particles and the adhesive strength between the positive electrode and the positive electrode current collector, and specific examples thereof include a fluorine resin binder including polyvinylidene fluoride (PVDF) or polytetrafluoroethylene (PTFE); a rubber binder including styrene butadiene rubber (SBR), acrylonitrile-butadiene rubber, and styrene-isoprene rubber; a cellulose binder including carboxyl methyl cellulose (CMC), starch, hydroxy propyl cellulose, and regenerated cellulose; a polyalcohol binder including polyvinyl alcohol; a polyolefin binder including polyethylene and polypropylene; a polyimide binder; and a polyester binder. And silane binders, etc. can be mentioned, and one of these can be used alone or a mixture of two or more can be used. The positive electrode binder can be included in an amount of 1 to 30 wt%, preferably 1 to 20 wt%, and more preferably 1 to 10 wt%, based on the total weight of the positive electrode active material layer. 2) Cathode The above negative electrode can be manufactured by a method of applying negative electrode slurry to one side or both sides of a sheet-shaped negative electrode collector, removing the solvent of the negative electrode slurry through a drying process, and then rolling. Meanwhile, a negative electrode including a non-coated region can be manufactured by a method of not applying the negative electrode slurry to some area of ​​the negative electrode collector, for example, one end of the negative electrode collector, during the application of the negative electrode slurry. The above negative electrode slurry can be prepared by dispersing the negative electrode active material in a solvent such as distilled water, ethanol, methanol, or isopropyl alcohol. Alternatively, the cathode may be manufactured by casting the cathode slurry onto a separate support, peeling the film from the support, and laminating the resulting film onto a cathode current collector. The negative electrode manufactured thus includes a negative electrode current collector; and a negative electrode active material layer; and the negative electrode active material layer may include a negative electrode active material. The above negative electrode current collector is not particularly limited as long as it has high conductivity without causing chemical changes in the battery, and for example, copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel surface-treated with carbon, nickel, titanium, silver, etc., aluminum-cadmium alloy, etc. can be used. The above negative electrode current collector can typically have a thickness of 3 to 500 ㎛. In addition, the negative current collector, like the positive current collector, can form fine irregularities on the surface of the negative current collector to strengthen the bonding strength of the negative active material. For example, it can be used in various forms such as a film, sheet, foil, net, porous body, foam, and non-woven fabric. The negative electrode active material layer may be positioned on the negative electrode current collector, and specifically, may be positioned on one side or both sides of the negative electrode current collector. The negative electrode active material layer may have a single layer or a multilayer structure of two or more layers. The thickness of the above negative active material layer may be 180 ㎛ to 200 ㎛, preferably 180 ㎛ to 190 ㎛, and more preferably 184 ㎛ to 190 ㎛. When the above range is satisfied, the capacity characteristics and life characteristics can be improved. The above negative active material may include a carbon-based active material. For example, the carbon-based active material may be at least one selected from the group consisting of amorphous, plate-like, flake-like, spherical or fibrous natural graphite or artificial graphite, Kish graphite, pyrolytic carbon, mesophase pitch based carbon fiber, meso-carbon microbeads, mesophase pitches and petroleum or coal tar pitch derived cokes. Preferably, the negative electrode active material may include at least one selected from the group consisting of natural graphite and artificial graphite. When the negative electrode active material is included, capacity characteristics and life characteristics may be improved. The above negative active material may be included in an amount of 90 wt% to 99 wt%, preferably 93 wt% to 99 wt%, and more preferably 96 wt% to 99 wt%, based on the total weight of the negative active material layer. Meanwhile, the negative electrode active material layer may optionally further include a negative electrode conductive material and a negative electrode binder in addition to the negative electrode active material. The above-described negative electrode conductive material is used to provide conductivity to the electrode, and in the battery to be formed, as long as it does not cause a chemical change and has electronic conductivity, it can be used without special restrictions. Specific examples include graphite such as natural graphite or artificial graphite; carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, summer black, carbon fiber, carbon nanotube, etc.; metal powder or metal fiber such as copper, nickel, aluminum, silver, etc.; conductive whiskers such as zinc oxide or potassium titanate; conductive metal oxides such as titanium oxide; or conductive polymers such as polyphenylene derivatives, etc., and one of these may be used alone or a mixture of two or more may be used. The above-described negative electrode conductive material may be typically included in an amount of 1 to 30 wt%, preferably 1 to 20 wt%, and more preferably 1 to 10 wt%, based on the total weight of the negative electrode active material layer. The above negative electrode binder serves to improve the adhesion between negative electrode active material particles and the adhesive strength between the negative electrode active material and the negative electrode current collector. Specific examples thereof include polyvinylidene fluoride (PVDF), vinylidene fluoride-hexafluoropropylene copolymer (PVDF-co-HFP), polyvinyl alcohol, polyacrylonitrile, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinyl pyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene monomer rubber (EPDM rubber), sulfonated-EPDM, styrene-butadiene rubber (SBR), fluororubber, or various copolymers thereof, and one of these may be used alone or a mixture of two or more thereof may be used. The above negative electrode binder may be included in an amount of 1 to 30 wt%, preferably 1 to 20 wt%, and more preferably 1 to 10 wt%, based on the total weight of the negative electrode active material layer. Since the thickness, porosity and loading amount of the above cathode are the same as described above, a detailed description is omitted. 3) Membrane The above separator is interposed between the positive electrode and the negative electrode to separate the negative electrode and the positive electrode and to provide a passage for lithium ions to move. If it is commonly used as a separator in a lithium secondary battery, it can be used without special restrictions. Specifically, the separator may be a porous polymer film, for example, a porous polymer film made of a polyolefin polymer such as an ethylene homopolymer, a propylene homopolymer, an ethylene / butene copolymer, an ethylene / hexene copolymer, and an ethylene / methacrylate copolymer, or a laminated structure of two or more layers thereof. In addition, a conventional porous nonwoven fabric, for example, a nonwoven fabric made of high-melting-point glass fibers, polyethylene terephthalate fibers, etc. may be used. In addition, a coated separator containing a ceramic component or a polymer material may be used to secure heat resistance or mechanical strength. Meanwhile, the positive electrode (10) and negative electrode (11) have a structure in which an active material layer (21) is formed on a sheet-shaped current collector (20), and may include a non-conductive portion (22) in which the active material layer (21) is not formed in some area of ​​the current collector (20). As described above, by using a positive electrode (10) and a negative electrode (11) including a non-conductive portion (22), a battery having a structure in which at least a portion of the non-conductive portion of the positive electrode (10) and negative electrode (11) defines an electrode tab can be implemented without providing a separate electrode tab. Specifically, the non-conductive portion (22) can be formed long along the winding direction (X) at one end of the current collector (20), and a current collecting plate is combined with each of the positive non-conductive portion and the negative non-conductive portion, and the current collecting plate is connected to an electrode terminal, thereby functioning as an electrode tab. For example, a battery in which the positive electrode non-coated portion and the negative electrode non-coated portion function as electrode tabs can be manufactured by the following method. First, a separator, a positive electrode, a separator, and a negative electrode are sequentially laminated so that the positive electrode non-coated portion and the negative electrode non-coated portion are positioned in opposite directions, and then wound in one direction to manufacture a jelly-roll type electrode assembly. Then, the positive and negative electrode non-coated portions are folded toward the winding center (C), and then current collector plates are welded to the positive electrode non-coated portion and the negative electrode non-coated portion respectively to join them, and the current collector plates are connected to electrode terminals to manufacture a battery. The current collector plates have a larger cross-sectional area than the strip-type electrode tabs, and since resistance is inversely proportional to the cross-sectional area of ​​a path through which current flows, when a secondary battery is formed with the above structure, the cell resistance can be significantly reduced. Meanwhile, the positive and negative electrode portions may be processed into a plurality of independently foldable segments, and at least some of the plurality of segments may be folded toward the winding center (C) of the electrode assembly. The above segments can be formed by processing the positive and negative current collectors through a metal foil cutting process such as laser notching, ultrasonic cutting, or punching. When the non-conductive portions of the positive and negative electrodes are processed in the form of multiple segments, the stress applied to the non-conductive portion during bending can be reduced, thereby preventing deformation or damage to the non-conductive portion, and improving the welding characteristics with the current collecting plate. The collector plate and the plain portion are generally joined by welding. In order to improve the welding characteristics, strong pressure should be applied to the welding area of ​​the plain portion to fold the plain portion as flat as possible. However, during this bending process, the shape of the plain portion may be distorted and deformed irregularly, and the deformed portion may come into contact with an electrode of the opposite polarity, causing an internal short circuit or inducing micro-cracks in the plain portion. However, if the plain portions of the positive and negative electrodes are processed into a plurality of independently bendable segments, the stress applied to the plain portion during bending can be relieved, thereby minimizing deformation and damage to the plain portion. In addition, when the non-conductive portion is processed in the form of segments as described above, overlap occurs between the plurality of segments during folding, which increases the welding strength with the current collector plate, and when using the latest technology such as laser welding, it is possible to prevent the problem of the laser penetrating into the electrode assembly and melting away the separator or active material. Preferably, at least some of the plurality of folded segments may overlap on the upper and lower sides of the electrode assembly, and the current collector plate may be bonded on the plurality of overlapped segments. Meanwhile, the electrode assembly according to the present invention may be formed with a structure in which an insulating layer (24) is additionally formed on the positive electrode (10), as illustrated in FIG. 3. Specifically, the insulating layer (24) may be formed to cover a portion of the positive electrode active material layer and a portion of the non-conductive portion along a direction parallel to the winding direction of the electrode assembly. In the case of a battery having a tab-less structure in which the non-conductive portion (22c) of the positive electrode (10) and the non-conductive portion (22a) of the negative electrode (11) are used as electrode tabs, an electrode assembly is formed so that the positive electrode (10) protrudes above the separator (12) and the negative electrode (11) protrudes below the separator (12), and the protruding positive electrode (10) and / or negative electrode (11) are folded and then combined with a current collecting plate. However, when the positive electrode (10) or negative electrode (11) is folded as described above, the current collector of the positive electrode (10) or negative electrode (11) is positioned close to an electrode of the opposite polarity beyond the separator, which may cause the positive electrode and negative electrode to come into electrical contact, thereby causing an internal short circuit. However, as shown in Fig. 5, when an insulating layer (24) covering the positive electrode active material layer and a portion of the non-conductive portion is formed, the positive electrode (10) and the negative electrode (11) can be prevented from electrically contacting each other by the insulating layer (24), thereby preventing a short circuit from occurring inside the battery. Preferably, the insulating layer (24) may be provided on at least one surface of the positive electrode (10) current collector, and preferably, may be provided on both surfaces of the positive electrode (10). In addition, the insulating layer (24) may be formed in an area of ​​the positive electrode (10) that is likely to face the active material layer (21a) of the negative electrode (11). For example, in the case of the non-coated portion (22c) of the positive electrode (10) that faces the negative electrode (11) after being folded, the insulating layer (24) may be formed to extend to the end of the non-coated portion (22c). However, in the case of the opposite side of the surface that faces the negative electrode (11) after being folded, it is preferable that the insulating layer (24) be formed only in a part of the non-coated portion (22c), for example, up to the point before the bending of the non-coated portion (22c). This is because, if the insulating layer (24) is formed in the entire area of ​​the non-coated portion on the opposite side of the surface that faces the negative electrode (11), electrical contact with the current collecting plate is impossible, and thus, it cannot function as an electrode tab. Meanwhile, the insulating layer (24) can be attached to the anode while securing insulating performance, and its material or component is not particularly limited. For example, the insulating layer can be an insulating coating layer or an insulating tape, and the insulating coating layer can include an organic binder and inorganic particles. At this time, the organic binder can be, for example, styrene-butadiene rubber (SBR), and the inorganic particles can be, but are not limited to, alumina oxide. (2) Battery case The above battery case is for accommodating the electrode assembly and the electrolyte, and may be a cylindrical battery case. The form factor ratio (defined as the ratio of the diameter (R) to the height (H) of the cylindrical lithium secondary battery according to the present invention, which is the value obtained by dividing the diameter of the cylindrical battery by the height) is the same as described above, and therefore a detailed description is omitted. The cylindrical lithium secondary battery according to the present invention may be, for example, a 46110 cell (diameter 46 mm, height 110 mm, form factor ratio 0.418), a 4875 cell (diameter 48 mm, height 75 mm, form factor ratio 0.640), a 48110 cell (diameter 48 mm, height 110 mm, form factor ratio 0.436), a 4880 cell (diameter 48 mm, height 80 mm, form factor ratio 0.600), a 4680 cell (diameter 46 mm, height 80 mm, form factor ratio 0.575), a 4695 cell (diameter 46 mm, height 95 mm, form factor ratio 0.484). In the figures representing the form factor, the first two numbers represent the diameter (R) of the lithium secondary battery, and the next two or three numbers represent the height (H) of the lithium secondary battery. (3) Electrolyte The electrolyte according to the present invention comprises a lithium salt and an organic solvent. The lithium salt may be used without any particular limitation as long as it is a compound capable of providing lithium ions used in a lithium secondary battery. Specifically, the lithium salt may include at least one selected from the group consisting of LiPF6, LiClO4, LiAsF6, LiBF4, LiSbF6, LiAl04, LiAlCl4, LiCF3SO3, LiC4F9SO3, LiN(C2F5SO3)2, LiN(C2F5SO2)2, LiN(CF3SO2)2. LiCl, LiI, or LiB(C2O4)2, preferably at least one selected from the group consisting of LiPF6. The concentration of the lithium salt may be 1.0 to 1.5 M, preferably 1.0 to 1.4 M, more preferably 1.0 to 1.3 M, and even more preferably 1.15 to 1.3 M. When the concentration of the lithium salt is within the above range, the electrolyte has appropriate conductivity and viscosity, so that it can exhibit excellent electrolyte performance and lithium ions can move effectively. The above organic solvent may include at least one selected from the group consisting of a cyclic carbonate-based organic solvent, a linear carbonate-based organic solvent, a linear ester-based organic solvent, and a cyclic ester-based organic solvent. The above cyclic carbonate-based organic solvent is a high-viscosity organic solvent, and may include at least one organic solvent selected from the group consisting of ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, and vinylene carbonate. In addition, the linear carbonate-based organic solvent is an organic solvent having low viscosity and low dielectric constant, and representative examples thereof include at least one organic solvent selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, ethyl methyl carbonate (EMC), methyl propyl carbonate, and ethyl propyl carbonate, and specifically, ethyl methyl carbonate (EMC) may be included. Specific examples of the linear ester organic solvent include at least one organic solvent selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, and butyl propionate. The above cyclic ester organic solvent may include at least one organic solvent selected from the group consisting of γ-butyrolactone, γ-valerolactone, γ-caprolactone, σ-valerolactone, and ε-caprolactone. Preferably, the electrolyte according to the present invention may include ethylene carbonate and dimethyl carbonate as organic solvents. Meanwhile, in addition to the electrolyte components, the electrolyte may additionally contain other additives for the purposes of improving the life characteristics of the battery, suppressing battery capacity reduction, and improving the discharge capacity of the battery. These other additives may include at least one other additive selected from the group consisting of, for example, cyclic carbonate compounds, halogen-substituted carbonate compounds, sultone compounds, sulfate compounds, borate compounds, nitrile compounds, benzene compounds, amine compounds, silane compounds, and lithium salt compounds different from the lithium salt included in the electrolyte. Specifically, the other additives include vinylene carbonate (VC), vinylethylene carbonate, fluoroethylene carbonate (FEC), 1,3-propane sultone (PS), 1,4-butane sultone, ethene sultone, 1,3-propene sultone (PRS), 1,4-butene sultone, 1-methyl-1,3-propene sultone, ethylene sulfate (ESA), trimethylene sulfate (TMS), methyl trimethylene sulfate (MTMS), tetraphenylborate, lithium oxalyldifluoroborate, succinonitrile, adiponitrile, acetonitrile, propionitrile, butyronitrile, valeronitrile, caprylonitrile, heptanenitrile, cyclopentane carbonitrile, cyclohexane carbonitrile, The present invention relates to a compound selected from the group consisting of 2-fluorobenzonitrile, 4-fluorobenzonitrile, difluorobenzonitrile, trifluorobenzonitrile, phenylacetonitrile, 2-fluorophenylacetonitrile, 4-fluorophenylacetonitrile, fluorobenzene, triethanolamine, ethylenediamine, tetravinylsilane, LiN(SO2F)2(lithium bis(fluorosulfonyl)imide, LiFSI), LiN(SO2CF3)2(lithium bis(trifluoromethane sulfonyl)imide, LiTFSI), LiPO2F2, LiODFB, LiBOB (lithium bisoxalatoborate (LiB(C2O4)2) and LiBF4. The above other additives may be included in an amount of 0.01 to 20 wt% based on the total weight of the electrolyte, and preferably 0.05 to 5.0 wt%. If the content of the above other additives is less than 0.01 wt%, the effects of improving the low-temperature output of the battery and the high-temperature storage characteristics and high-temperature life characteristics are minimal, and if the content of the above other additives exceeds 20 wt%, there is a possibility that side reactions may occur excessively in the electrolyte during charge and discharge of the battery. In particular, when the above SEI film-forming additives are added in excessive amounts, they may not be sufficiently decomposed at high temperatures and may exist as unreacted substances or in a precipitated state in the electrolyte at room temperature. Accordingly, side reactions that reduce the life or resistance characteristics of the secondary battery may occur. Next, the structure of a lithium secondary battery according to the present invention will be described. FIGS. 4 and 5 disclose implementation examples of lithium secondary batteries according to the present invention. Hereinafter, a lithium secondary battery according to the present invention will be described with reference to FIGS. 4 and 5. However, FIGS. 4 and 5 only show one embodiment of the present invention, and the structure of the battery of the present invention is not limited to the range disclosed in FIGS. 4 and 5. FIG. 4 illustrates a cross-sectional view of a lithium secondary battery having a tab-less structure according to one embodiment of the present invention. Referring to FIG. 4, a lithium secondary battery (140) according to the present invention may include an electrode assembly (141), a battery case (142) in which the electrode assembly (141) and an electrolyte (not shown) are stored, and a sealing body (143) that seals an open end of the battery case (142). At this time, the electrode assembly may be a laminate of a positive electrode, a separator, and a negative electrode, which is wound in one direction. In addition, the positive electrode and the negative electrode of the electrode assembly may each include a non-coated portion on which an active material layer is not formed, and may be laminated and wound such that the positive electrode non-coated portion and the negative electrode non-coated portion are positioned at the top and bottom of the electrode assembly, respectively. Since the electrode assembly has been described above, only the remaining components excluding the electrode assembly will be described below. Meanwhile, the battery case (142) is a can-shaped container with an open end formed at the top, and is made of a conductive metal material such as aluminum or steel. The battery case accommodates an electrode assembly (141) in the inner space through the open end at the top, and also accommodates an electrolyte (not shown). Meanwhile, it is preferable that the lithium secondary battery (140) of the present invention does not include a current interruption device (CID). Meanwhile, as illustrated in FIG. 4, the battery case (142) is electrically connected to the negative electrode non-conductive portion (146b) and can function as a negative terminal that contacts an external power source and transmits current applied from the external power source to the negative electrode. If necessary, a beading portion (147) and a crimping portion (148) may be provided on the upper end of the battery case (142). The beading portion (147) may be formed by pressing the outer circumference of the battery case (142) to a distance of D1. The beading portion (147) may prevent the electrode assembly (141) accommodated inside the battery case (142) from coming out through the upper opening of the battery case (142), and may function as a support portion on which the sealing body (143) is secured. The above crimping portion (148) can be formed on the upper portion of the beading portion (147), and has an extended and bent shape to surround the outer surface of the cap plate (143a) placed on the beading portion (147) and a portion of the upper surface of the cap plate (143a). Next, the sealing body (143) is for sealing the open end of the battery case (142), and includes a cap plate (143a), a first gasket (143b) that provides airtightness and insulation between the cap plate (143a) and the battery case (142), and, if necessary, may further include a connecting plate (143c) that is electrically and mechanically coupled to the cap plate (143a). The cap plate (143a) is pressed onto a beading portion (147) formed on the battery case (142), and may be fixed by a crimping portion (148). The cap plate (143a) is a component made of a conductive metal material and covers the upper opening of the battery case (142). The cap plate (143a) is electrically connected to the positive electrode of the electrode assembly (141) and is electrically insulated from the battery case (142) through the first gasket (143b). Therefore, the cap plate (143a) can function as a positive electrode terminal of a lithium secondary battery. The cap plate (143a) can have a protrusion (143d) formed to protrude upward from its center C, and the protrusion (143d) can come into contact with an external power source to allow current to be applied from the external power source. A first gasket (143b) may be interposed between the cap plate (143a) and the crimping portion (148) to ensure airtightness of the battery case (142) and to provide electrical insulation between the battery case (142) and the cap plate (143a). Meanwhile, the lithium secondary battery (140) according to the present invention may further include a current collecting plate (144, 145), if necessary. The current collecting plate is coupled to the positive electrode non-conducting portion (146a) and the negative electrode non-conducting portion (146b), and is connected to the electrode terminals (i.e., the positive electrode terminal and the negative electrode terminal). Specifically, a cylindrical battery (140) according to the present invention may include a first current collecting plate (144) coupled to an upper portion of an electrode assembly (141) and a second current collecting plate (145) coupled to a lower portion of the electrode assembly (141). It may further include a first collector plate (144) and / or a second collector plate (145). The first collector plate (144) is coupled to the upper portion of the electrode assembly (141). The first collector plate (144) is made of a conductive metal material such as aluminum, copper, nickel, etc., and is electrically connected to the non-conductive portion (146a) of the positive electrode. A lead (149) may be connected to the first collector plate (144). The lead (149) may extend upward from the electrode assembly (141) and be coupled to the connection plate (143c) or may be directly coupled to the lower surface of the cap plate (143a). The coupling of the lead (149) and other components may be accomplished by welding. Preferably, the first collector plate (144) may be formed integrally with the lead (149). In this case, the lead (149) may have a plate shape that extends outward from the center of the first collector plate (144). Meanwhile, the first collector plate (144) is joined to an end of the non-conductive portion (146a) of the anode, and the joining can be accomplished by, for example, laser welding, resistance welding, ultrasonic welding, soldering, or the like. The second collector plate (145) is coupled to the lower portion of the electrode assembly (141). The second collector plate (145) is made of a conductive metal material such as aluminum, copper, nickel, etc., and is electrically connected to the non-conductive portion (146b) of the negative electrode. One side of the second collector plate (145) can be coupled to the non-conductive portion (146b) of the negative electrode, and the opposite side can be coupled to the inner bottom surface of the battery case (142). At this time, the coupling can be performed by a method such as laser welding, resistance welding, ultrasonic welding, or soldering. Meanwhile, the lithium secondary battery (140) according to the present invention may further include an insulator (146), if necessary. The insulator (146) may be arranged to cover the upper surface of the first current collecting plate (144). Since the insulator (146) covers the first current collecting plate (144), direct contact between the first current collecting plate (144) and the inner surface of the battery case (142) can be prevented. The insulator (146) is provided with a lead hole (151) through which a lead (149) extending upward from the first collector plate (144) can be drawn out. The lead (149) is drawn upward through the lead hole (151) and coupled to the lower surface of the connecting plate (143c) or the lower surface of the cap plate (143a). The insulator (146) may be made of a polymer resin material having insulating properties, such as polyethylene, polypropylene, polyimide, or polybutylene terephthalate. Meanwhile, the lithium secondary battery (140) according to the present invention may further include a venting portion (152) formed on the lower surface of the battery case (142), if necessary. The venting portion (152) corresponds to a region of the lower surface of the battery case (142) that has a thinner thickness than the surrounding region. Since the venting portion (152) is thin, it is structurally weaker than the surrounding region. Therefore, when the pressure inside the lithium secondary battery (140) increases above a certain level, the venting portion (152) ruptures, thereby allowing gas inside the battery case (152) to be discharged to the outside, thereby preventing the battery from exploding. FIG. 5 illustrates a cross-sectional view of a lithium secondary battery having a tab-less structure according to another embodiment of the present invention. Referring to FIG. 5, a cylindrical lithium secondary battery (170) according to another embodiment of the present invention has a different structure of a battery case and a sealant compared to the lithium secondary battery (140) illustrated in FIG. 4, and the configuration of the electrode assembly and electrolyte is substantially the same. Specifically, a cylindrical lithium secondary battery (170) according to another embodiment of the present invention includes a battery case (171) having a rivet terminal (172) installed therethrough. The rivet terminal (172) is installed in a partially closed closed surface (upper surface in the drawing) of one end of the battery case (171). The rivet terminal (172) is riveted to a through hole (first opening of the first end) of the battery case (171) while an insulating second gasket (173) is interposed therebetween. The rivet terminal (172) is exposed to the outside in a direction opposite to the gravity direction. The rivet terminal (172) includes a terminal exposure portion (172a) and a terminal insertion portion (172b). The terminal exposure portion (172a) is exposed to the outside of the closed surface of the battery case (171). The terminal exposure portion (172a) may be located approximately at the center of the partially closed surface of the battery case (171). The maximum diameter of the terminal exposure portion (172a) may be formed larger than the maximum diameter of the through hole formed in the battery case (171). The terminal insertion portion (172b) may penetrate approximately at the center of the closed surface of the battery case (171) and be electrically connected to the non-conductive portion (146a) of the positive electrode. The terminal insertion portion (172b) may be riveted onto the inner surface of the battery case (171). That is, an end of the terminal insertion portion (172b) may have a shape that is bent toward the inner surface of the battery case (171). The maximum diameter of the end of the terminal insertion portion (172b) may be larger than the maximum diameter of the through hole of the battery case (171). The lower surface of the terminal insertion portion (172b) can be welded with the first current collecting plate (144) connected to the non-polar portion (146a) of the positive electrode. An insulating cap (174) made of an insulating material can be interposed between the first current collecting plate (144) and the inner surface of the battery case (171). The insulating cap (174) covers the upper portion of the first current collecting plate (144) and the upper edge portion of the electrode assembly (141). This prevents the outer non-polar portion (B3) of the electrode assembly (141) from coming into contact with the inner surface of the battery case (171) having a different polarity, thereby causing a short circuit. The terminal insertion portion (172b) of the rivet terminal (172) can be welded to the first current collecting plate (144) by penetrating the insulating cap (174). The second gasket (173) is interposed between the battery case (171) and the rivet terminal (172) to prevent the battery case (171) and the rivet terminal (172) having opposite polarities from electrically contacting each other. As a result, the upper surface of the battery case (171) having a substantially flat shape can function as a positive terminal of a cylindrical lithium secondary battery (170). The second gasket (173) includes a gasket exposure portion (173a) and a gasket insertion portion (173b). The gasket exposure portion (173a) is interposed between the terminal exposure portion (172a) of the rivet terminal (172) and the battery case (171). The gasket insertion portion (173b) is interposed between the terminal insertion portion (172b) of the rivet terminal (172) and the battery case (171). The gasket insertion portion (173b) can be deformed together with the terminal insertion portion (172b) during riveting so as to be in close contact with the inner surface of the battery case (171). The second gasket (173) can be made of, for example, an insulating polymer resin. The gasket exposure portion (173a) of the second gasket (173) may have an extended shape so as to cover the outer surface of the terminal exposure portion (172a) of the rivet terminal (172). When the second gasket (173) covers the outer surface of the rivet terminal (172), a short circuit can be prevented from occurring during the process of connecting an electrical connection component such as a bus bar to the upper surface of the battery case (171) and / or the rivet terminal (172). Although not shown in the drawing, the gasket exposure portion (173a) may have an extended shape so as to cover not only the outer surface of the terminal exposure portion (172a) but also a part of the upper surface. In the case where the second gasket (173) is made of a polymer resin, the second gasket (173) can be joined to the battery case (171) and the rivet terminal (172) by heat fusion. In this case, the sealing at the joining interface between the second gasket (173) and the rivet terminal (172) and the joining interface between the second gasket (173) and the battery case (171) can be strengthened. Meanwhile, in the case where the gasket exposure portion (173a) of the second gasket (173) has a form that extends to the upper surface of the terminal exposure portion (172a), the rivet terminal (172) can be joined integrally with the second gasket (173) by insert injection. The remaining area (175) of the upper surface of the battery case (171), excluding the area occupied by the rivet terminal (172) and the second gasket (173), corresponds to a negative terminal having the opposite polarity to the rivet terminal (172). The second collector plate (176) is coupled to the lower portion of the electrode assembly (141). The second collector plate (176) is made of a conductive metal material such as aluminum, steel, copper, or nickel, and is electrically connected to the unconducted portion (146b) of the cathode. Preferably, the second collector plate (176) is electrically connected to the battery case (171). To this end, at least a portion of an edge portion of the second collector plate (176) may be interposed and fixed between the inner surface of the battery case (171) and the first gasket (178b). In one example, at least a portion of an edge portion of the second collector plate (176) may be fixed to the beading portion (180) formed at the lower end of the battery case (171) by welding while being supported by the lower surface of the beading portion (180). In a variation, at least a portion of an edge portion of the second collector plate (176) may be directly welded to the inner wall surface of the battery case (171). The second collector plate (176) may have a plurality of protrusions (not shown) formed radially on a surface facing the non-conductive portion (146b). When the protrusions are formed, the second collector plate (176) may be pressed to press the protrusions into the non-conductive portion (146b). Preferably, the ends of the second collector plate (176) and the non-conductive portion (146b) can be joined by welding, for example, laser welding. A sealing member (178) for sealing the lower open end of the battery case (171) includes a cap plate (178a) and a first gasket (178b). The first gasket (178b) electrically separates the cap plate (178a) and the battery case (171). A crimping member (181) secures the edge of the cap plate (178a) and the first gasket (178b) together. A vent member (179) is provided in the cap plate (178a). The configuration of the vent member (179) is substantially the same as in the above-described embodiment. Preferably, the cap plate (178a) is made of a conductive metal material. However, since a first gasket (178b) is interposed between the cap plate (178a) and the battery case (171), the cap plate (178a) does not have electrical polarity. The sealing body (178) seals the open end of the lower portion of the battery case (171) and discharges gas when the internal pressure of the battery cell (170) increases above a critical value. Preferably, the rivet terminal (172) electrically connected to the non-conductive portion (146a) of the positive electrode is used as the positive terminal. In addition, the portion (175) of the upper surface of the battery case (171) electrically connected to the non-conductive portion (146b) of the negative electrode through the second current collecting plate (176), excluding the rivet terminal (172), is used as the negative terminal. In this way, when the two electrode terminals are positioned on the upper portion of the lithium secondary battery, it is possible to place electrical connection components such as bus bars on only one side of the cylindrical lithium secondary battery (170). This can lead to simplification of the battery pack structure and improvement of energy density. In addition, since the portion (175) used as the negative terminal has a substantially flat shape, a sufficient connection area can be secured when connecting electrical connection components such as bus bars. Accordingly, the cylindrical lithium secondary battery (170) can lower the resistance at the connection portion of the electrical connection components to a desirable level. When a lithium secondary battery is formed with a tab-less structure as described above, the current concentration is less than that of a conventional battery having electrode tabs, so the heat generation inside the battery can be effectively reduced, and thus the thermal safety of the battery can be improved. Battery pack The cylindrical lithium secondary battery of the present invention as described above can be included as a unit cell in manufacturing a battery pack. FIG. 6 schematically illustrates the configuration of a battery pack according to an embodiment of the present invention. Referring to FIG. 6, a battery pack (3) according to an embodiment of the present invention includes an assembly of lithium secondary batteries (1) electrically connected thereto and a pack housing (2) accommodating the assembly. The lithium secondary battery (1) is a lithium secondary battery according to the embodiment described above. In the drawing, for the convenience of illustration, parts such as a bus bar, a cooling unit, and an external terminal for electrically connecting the lithium secondary batteries (1) are omitted. The above battery pack (3) can be mounted on a vehicle. The vehicle may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. The vehicle includes a four-wheel vehicle or a two-wheel vehicle. The present invention will be described more specifically through specific examples below. Example 1 <Cathode Manufacturing> A negative electrode slurry was prepared by adding a negative electrode active material, a conductive agent, and a binder to distilled water at a weight ratio of 98:0.2:1.8. At this time, graphite was used as the negative electrode active material, carbon nanotubes were used as the conductive agent, and a cellulose-based binder was used as the binder. The above negative electrode slurry was applied on a copper current collector having a thickness of 8 μm, dried, and then roll pressed to manufacture a negative electrode including a negative electrode active material layer. At this time, the thickness of the negative electrode was 190 μm, and the loading amount was 0.35 g / 25 cm. 2 , and the porosity was 25.5%. <Electrode assembly manufacturing> A cathode slurry was prepared by adding a cathode active material, a conductive agent, and a binder to N-methylpyrrolidone at a weight ratio of 98:0.5:1.5. At this time, lithium nickel cobalt manganese oxide was used as the cathode active material, carbon nanotubes were used as the conductive agent, and PVDF was used as the binder. The above positive electrode slurry was applied onto an aluminum current collector, dried, and then roll pressed to manufacture a positive electrode. A separator was interposed between the positive and negative electrodes manufactured as described above, and the electrodes were laminated in the order of separator / positive electrode / separator / negative electrode, and then wound to manufacture a jelly-roll type electrode assembly. <Electrolyte manufacturing> An electrolyte was prepared by adding LiPF6 to a molar concentration of 1.25 M in an organic solvent containing ethylene carbonate (EC), dimethyl carbonate (DMC), and ethyl methyl carbonate (EMC) in a weight ratio of 2:7:1. <Lithium secondary battery manufacturing> The total volume of the internal space of the electrode assembly above is 122.93 cm 3 After inserting the cylindrical battery case, 25.7 mL of the electrolyte prepared above was injected to prepare 4680 cells (diameter: 46 mm, height: 80 mm). At this time, the dead volume (V) of the prepared lithium secondary battery d ) is 16.7cm 3 , pore volume (V p ) is 26cm 3 was measured as . Example 2 <Cathode Manufacturing> The thickness of the manufactured cathode is 190㎛ and the loading amount is 0.35 g / 25cm 2 The cathode was manufactured in the same manner as in Example 1, except that the porosity was 25.5%. <Electrode assembly manufacturing> An electrode assembly was manufactured using the same method as in Example 1, except that the cathode manufactured above was used. <Electrolyte manufacturing> The electrolyte was prepared using the same method as in Example 1. <Lithium secondary battery manufacturing> The total volume of the internal space of the electrode assembly above is 122.93 cm 3After inserting the cylindrical battery case, 27.7 mL of the electrolyte prepared above was injected to prepare 4680 cells (diameter: 46 mm, height: 80 mm). At this time, the dead volume (V) of the prepared lithium secondary battery d ) is 16.7cm 3 , pore volume (V p ) is 26cm 3 was measured as . Example 3 <Cathode Manufacturing> The thickness of the manufactured cathode is 188㎛ and the loading amount is 0.35g / 25cm 2 The cathode was manufactured in the same manner as in Example 1, except that the porosity was 25.9%. <Electrode assembly manufacturing> An electrode assembly was manufactured using the same method as in Example 1, except that the cathode manufactured above was used. <Electrolyte manufacturing> The electrolyte was prepared using the same method as in Example 1. <Lithium secondary battery manufacturing> The total volume of the internal space of the electrode assembly above is 122.93 cm 3 After inserting the cylindrical battery case, 25.8 mL of the electrolyte prepared above was injected to prepare 4680 cells (diameter: 46 mm, height: 80 mm). At this time, the dead volume (V) of the prepared lithium secondary battery d ) is 16.7cm 3 , pore volume (V p ) is 26.2cm 3 was measured as . Example 4 <Cathode Manufacturing> The thickness of the manufactured cathode is 184㎛ and the loading amount is 0.37g / 25cm 2 The cathode was manufactured in the same manner as in Example 1, except that the porosity was 24.7%. <Electrode assembly manufacturing> An electrode assembly was manufactured using the same method as in Example 1, except that the cathode manufactured above was used. <Electrolyte manufacturing> The electrolyte was prepared using the same method as in Example 1. <Lithium secondary battery manufacturing> The total volume of the internal space of the electrode assembly above is 122.93 cm 3 After inserting the cylindrical battery case, 27.6 mL of the electrolyte prepared above was injected to prepare a 4680 cell (diameter: 46 mm, height: 80 mm). At this time, the dead volume (V) of the prepared 4680 cell d ) is 16.27cm 3 , pore volume (V p ) is 26.07cm 3 was measured as . Example 5 <Cathode Manufacturing> The thickness of the manufactured cathode is 184.1㎛ and the loading amount is 0.37g / 25cm 2 The negative electrode was manufactured in the same manner as in Example 1, except that the porosity was 24.0%. <Electrode assembly manufacturing> An electrode assembly was manufactured using the same method as in Example 1, except that the cathode manufactured above was used. <Electrolyte manufacturing> The electrolyte was prepared using the same method as in Example 1. <Lithium secondary battery manufacturing> The total volume of the internal space of the electrode assembly above is 122.93 cm 3 After inserting the cylindrical battery case, 26.2 mL of the electrolyte prepared above was injected to prepare a 4680 cell (diameter: 46 mm, height: 80 mm). At this time, the dead volume (V) of the prepared 4680 cell d ) is 16.27cm 3 , pore volume (V p ) is 25.17cm 3 was measured as . Comparative Example 1 <Cathode Manufacturing> The thickness of the manufactured cathode is 190㎛ and the loading amount is 0.35g / 25cm 2 The cathode was manufactured in the same manner as in Example 1, except that the porosity was 25.5%. <Electrode assembly manufacturing> An electrode assembly was manufactured using the same method as in Example 1, except that the cathode manufactured above was used. <Electrolyte manufacturing> The electrolyte was prepared using the same method as in Example 1. <Lithium secondary battery manufacturing> The total volume of the internal space of the electrode assembly above is 122.93 cm 3 After inserting the cylindrical battery case, 29 mL of the electrolyte prepared above was injected to prepare a 4680 cell (diameter: 46 mm, height: 80 mm). At this time, the dead volume (V) of the prepared 4680 cell d ) is 16.6cm 3 , pore volume (V p ) is 26.1cm 3 was measured as . Comparative Example 2 <Cathode Manufacturing> The thickness of the manufactured cathode is 188㎛ and the loading amount is 0.36g / 25cm 2 The negative electrode was manufactured in the same manner as in Example 1, except that the porosity was 25.0%. <Electrode assembly manufacturing> An electrode assembly was manufactured using the same method as in Example 1, except that the cathode manufactured above was used. <Electrolyte manufacturing> The electrolyte was prepared using the same method as in Example 1. <Lithium secondary battery manufacturing> The total volume of the internal space of the electrode assembly above is 122.93 cm 3After inserting the cylindrical battery case, 29 mL of the electrolyte prepared above was injected to prepare a 4680 cell (diameter: 46 mm, height: 80 mm). At this time, the dead volume (V) of the prepared 4680 cell d ) is 16.4cm 3 , pore volume (V p ) is 25.6cm 3 was measured as . Comparative Example 3 <Cathode Manufacturing> The thickness of the manufactured cathode is 187㎛ and the loading amount is 0.36g / 25cm 2 The cathode was manufactured in the same manner as in Example 1, except that the porosity was 25.3%. <Electrode assembly manufacturing> An electrode assembly was manufactured using the same method as in Example 1, except that the cathode manufactured above was used. <Electrolyte manufacturing> The electrolyte was prepared using the same method as in Example 1. <Lithium secondary battery manufacturing> The total volume of the internal space of the electrode assembly above is 122.93 cm 3 After inserting the cylindrical battery case, 29 mL of the electrolyte prepared above was injected to prepare a 4680 cell (diameter: 46 mm, height: 80 mm). At this time, the dead volume (V) of the prepared 4680 cell d ) is 16.3cm 3 , pore volume (V p ) is 26.1cm 3 was measured as . Comparative Example 4 <Cathode Manufacturing> The thickness of the manufactured cathode is 190㎛ and the loading amount is 0.35g / 25cm 2 The negative electrode was manufactured in the same manner as in Example 1, except that the porosity was 25.0%. <Electrode assembly manufacturing> An electrode assembly was manufactured using the same method as in Example 1, except that the cathode manufactured above was used. <Electrolyte manufacturing> The electrolyte was prepared using the same method as in Example 1. <Lithium secondary battery manufacturing> The total volume of the internal space of the electrode assembly above is 122.93 cm 3 After inserting the cylindrical battery case, 30.6 mL of the electrolyte prepared above was injected to prepare a 4680 cell (diameter: 46 mm, height: 80 mm). At this time, the dead volume (V) of the prepared 4680 cell d ) is 16.5cm 3 , pore volume (V p ) is 25.6cm 3 was measured as . Comparative Example 5 <Cathode Manufacturing> The thickness of the manufactured cathode is 190㎛ and the loading amount is 0.35g / 25cm 2 The negative electrode was manufactured in the same manner as in Example 1, except that the porosity was 24.0%. <Electrode assembly manufacturing> An electrode assembly was manufactured using the same method as in Example 1, except that the cathode manufactured above was used. <Electrolyte manufacturing> The electrolyte was prepared using the same method as in Example 1. <Lithium secondary battery manufacturing> The total volume of the internal space of the electrode assembly above is 122.93 cm 3 After inserting the cylindrical battery case, 30.6 mL of the electrolyte prepared above was injected to prepare a 4680 cell (diameter: 46 mm, height: 80 mm). At this time, the dead volume (V) of the prepared 4680 cell d ) is 16cm 3 , pore volume (V p ) is 25.1cm 3 was measured as . Comparative Example 6 <Cathode Manufacturing> The thickness of the manufactured cathode is 190㎛ and the loading amount is 0.0.33g / 25cm 2 The cathode was manufactured in the same manner as in Example 1, except that the porosity was 24.6%. <Electrode assembly manufacturing> An electrode assembly was manufactured using the same method as in Example 1, except that the cathode manufactured above was used. <Electrolyte manufacturing> The electrolyte was prepared using the same method as in Example 1. <Cylindrical Lithium Secondary Battery Manufacturing> After the electrode assembly was inserted into the cylindrical battery case as described above, the electrolyte manufactured as described above was injected to manufacture a 2170 cell (diameter: 21 mm, height: 70 mm). Experimental Example 1: P value measurement The characteristics of the cylindrical lithium secondary batteries manufactured in Examples 1 to 5 and Comparative Examples 1 to 6 and the P value defined by Equation 1 below are shown in Table 1 below. [Formula 1] In the above equation 1, H (unit: mm) means the height of the lithium secondary battery, R (unit: mm) means the diameter of the lithium secondary battery, and t a (Unit: ㎛) indicates the cathode thickness, and L a (Unit: g / 25cm 2 ) represents the negative loading, and P a (Unit: %) means cathode porosity, V c (Unit: cm 3 ) refers to the volume of empty space inside a lithium secondary battery. At this time, the above V c The cylindrical lithium secondary batteries manufactured in Examples 1 to 5 and Comparative Examples 1 to 6 were charged to a voltage of 4.2 V at 25°C, discharged, and activated, and then calculated according to the following Equation B. [Formula B] Volume V of empty space inside a lithium secondary battery c (cm 3 ) = V d +V p -V e In the above formula B, V d is the dead volume inside the battery case, and V p is the pore volume, V e is the volume of the electrolyte. The above V d , V p , V e were measured by the following methods, respectively. The dead volume V inside the above battery case d is the volume of a cylindrical lithium secondary battery excluding the volume occupied by the electrode assembly and the volume occupied by the battery case. The volume of the cylindrical lithium secondary battery was obtained by measuring the volume of the external shape of the cylindrical battery case applied in Examples 1 to 5 and Comparative Examples 1 to 6 in a sealed state. The above void volume V p was measured by multiplying the volume of each of the anode, cathode, and separator of Examples 1 to 5 and Comparative Examples 1 to 6 by their respective porosities. The volume V of the above electrolyte e The weight of the electrolyte remaining in the lithium secondary battery was calculated by dividing the weight of the electrolyte by the density of the electrolyte. The weight of the electrolyte remaining in the lithium secondary battery is (1) the weight (M) of the lithium secondary batteries manufactured in Examples 1 to 5 and Comparative Examples 1 to 6 that performed activation. L ), (2) a step of disassembling the lithium secondary battery to remove the electrolyte present in the battery case, (3) a step of immersing the battery case and the electrode assembly in dimethyl carbonate, a solvent, to remove the electrolyte present on the surface of the battery case, the surface of the electrode assembly, and the internal pores, and then drying the battery case and the electrode assembly, (4) a step of measuring the weight (M) of the dried battery case.C ) and the weight (M) of the dried electrode assembly A ) After going through the step of measuring the measured M L , M C , M A It can be measured by substituting it into Equation B-1. [Formula B-1] Weight of electrolyte remaining in lithium secondary battery = M L -M C -M A H[mm]R[mm]t a [㎛]L a [g / 25cm 2 ]P a [%]V c [cm 3 ]P Example 180461900.3525.520.07.5 Example 280461900.3525.518.68.06 Example 380461880.3525.9207.3 Example 480461840.3724.918.378.56 Example 58046184.10.3723.919.68.36 Comparative Example 180461900.3525.517.28.7 Comparative Example 280461880.3625.016.79.3 Comparative Example 380461870.3625.317.28.9 Comparative Example 480461900.3525.015.310.0Comparative Example 580461900.3524.014.710.8Comparative Example 670211700.3324.62.0733.0 Referring to Table 1 above, it can be confirmed that the lithium secondary batteries manufactured in Examples 1 to 5 have a P value of less than 8.7, but the lithium secondary batteries manufactured in Comparative Examples 1 to 6 have a P value of 8.7 or higher. Experimental Example 2: Evaluation of whether lithium plating occurs during rapid charging Each of the lithium secondary batteries manufactured in the above Examples 1 to 5 and Comparative Examples 1 to 6 was charged in CC / CV mode at a constant current (CC) of 1.0 C at 40°C until the voltage reached 4.2 V (cut-off current 0.05 C), and then discharged in CC mode until the voltage reached 2.5 V at a constant current (CC) of 1.0 C. The charge and discharge process was considered one cycle, and after repeating the charge and discharge up to 100 cycles, the lithium secondary batteries were disassembled, the electrode assembly was separated, and the occurrence of lithium plating on the surface of the negative electrode was visually confirmed. The results are shown in Table 2 below. - O: Lithium plating occurs. - X: Lithium plating does not occur. Whether lithium plating occursExample 1XExample 2XExample 3XExample 4XExample 5XComparative Example 1OComparative Example 2OComparative Example 3OComparative Example 4OComparative Example 5OComparative Example 6O Referring to Table 2 above, it can be confirmed that lithium plating does not occur in the lithium secondary batteries manufactured in Examples 1 to 5, but lithium plating occurs in the lithium secondary batteries manufactured in Comparative Examples 1 to 6. In particular, even in the case of the lithium secondary battery manufactured in Comparative Example 6, which has a smaller diameter and height than those of Examples 1 to 5 and Comparative Examples 1 to 5, it can be seen that lithium plating occurs since the P value is 11.0 or higher. Experimental Example 3: Rapid Charge Life Characteristics Each of the lithium secondary batteries manufactured in the above Examples 1 to 5 and Comparative Examples 1 to 6 was charged in CC / CV mode at a constant current (CC) of 1.0 C at 40°C until the voltage reached 4.2 V (cut-off current 0.05 C), and then discharged in CC mode until the voltage reached 2.5 V at a constant current (CC) of 1.0 C. The charge and discharge process was considered one cycle, and the charge and discharge were repeated up to 100 times, after which the capacity retention rate was measured. The results are shown in Table 3 below. Capacity retention rate [%] (@100 cycles)Example 194.2Example 293.5Example 394.2Example 492.1Example 593.1Comparative Example 184.15Comparative Example 280.0Comparative Example 386.2Comparative Example 478.0Comparative Example 582.0Comparative Example 675 Referring to Table 3 above, it can be confirmed that the lithium secondary batteries manufactured in Examples 1 to 5 have a superior capacity retention rate at high temperatures than the lithium secondary batteries manufactured in Comparative Examples 1 to 6. Experimental Example 4: Evaluation of Initial Battery Characteristics (1) Initial discharge capacity evaluation The initial discharge capacity of the lithium secondary batteries manufactured in Examples 1 to 5 and Comparative Examples 1 to 6 was measured. Specifically, each cell was charged to 4.2 V at a constant current of 0.33 C at 40°C and discharged to 2.5 V at a power of 19.1 W to evaluate the initial discharge capacity. The measurement results are shown in Table 4 below. (2) Initial resistance assessment The initial resistance of the lithium secondary batteries manufactured in Examples 1 to 5 and Comparative Examples 1 to 6 was measured. Specifically, each lithium secondary battery was charged to 100% SOC at a constant current of 0.25 C at 40°C, discharged for 10 seconds at a constant current of 0.5 C at 50% SOC, and then the initial resistance (DCIR) was calculated from the voltage drop that occurred at that time. The measurement results are shown in Table 4 below. DCIR [mΩ]Discharge capacity [Wh]Example 14.0597.7Example 23.8297.8Example 34.2597.5Example 43.997.7Example 54.197.8 Referring to Table 4 above, it can be confirmed that the lithium secondary batteries manufactured in Examples 1, 2, 4, and 5 have improved initial resistance and discharge capacity compared to the lithium secondary battery manufactured in Example 3. Through this, it can be understood that the lithium secondary battery having a P value of 7.4 to 8.6 is more preferable than the lithium secondary battery having a P value of less than 8.7 because it has excellent rapid charge characteristics, initial resistance, and capacity characteristics at the same time. (Explanation of symbols) 1: Lithium secondary battery 2: Pack Housing 3: Battery pack 10: Bipolar 11: Negative 12: Membrane 20: Whole house 21: Active material layer 21a: Negative active material layer 22: No-nonsense 22a: Cathode ignorance 22c: The ignorance of the polarity 24: Insulation layer C: Center of winding 140: Cylindrical lithium secondary battery 141: Electrode assembly 142: Battery Case 143: Seal 143a: Cap plate 143b: 1st gasket 143c: Connecting plate 143d: protrusion 144: 1st Collection Plate 145: 2nd collection plate 146: Insulator 146a: Bipolar ignorance 146b: Negative polarity 147: Bidding Department 148: Crimping section 149: Lead 151: Lead Hall 152: Benting Department 170: Cylindrical lithium secondary battery 171: Battery Case 172: Rivet terminal 172a: Terminal exposed part 172b: Terminal insertion part 173: 2nd gasket 173a: Gasket exposure area 173b: Gasket insert 174: Insulating cap 176: Second collector plate 178: Seal 178a: Cap plate 178b: 1st gasket 179: Vent 180: Bidding section 181: Crimping section

Claims

1. A cylindrical lithium secondary battery comprising an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; an electrolyte; and a battery case in which the electrode assembly and the electrolyte are accommodated. The above electrolyte comprises a lithium salt and an organic solvent, A cylindrical lithium secondary battery having a P value of less than 8.7, as defined by the following equation 1. [Formula 1] In the above equation 1, H (unit: mm) refers to the height of the lithium secondary battery, R (unit: mm) refers to the diameter of the lithium secondary battery, t a (Unit: ㎛) indicates the cathode thickness, L a (Unit: g / 25cm 2 ) represents the negative loading amount, P a (Unit: %) means cathode porosity, V c (Unit: cm 3 ) refers to the volume of empty space inside a lithium secondary battery.

2. In paragraph 1, A cylindrical lithium secondary battery having a P value of 7.4 to 8.6, represented by the above formula 1.

3. In paragraph 1, Above V c is 17.5cm 3 25cm inside 3 In, lithium secondary battery.

4. In paragraph 1, The volume of empty space inside a lithium secondary battery (V) relative to the total volume of the space inside the battery case (V) c ) of the ratio (V) c / V) is 0.08 to 0.25, a cylindrical lithium secondary battery.

5. In paragraph 1, A cylindrical lithium secondary battery, wherein the ratio of H to R (R / H) is 0.4 or more.

6. In paragraph 1, Above P a A cylindrical lithium secondary battery having a capacity of 23.5% or more.

7. In paragraph 1, Above L a is 0.25g / 25cm 2 0.45g / 25cm 2 A cylindrical lithium secondary battery.

8. In paragraph 1, Above t a A cylindrical lithium secondary battery having a diameter of 180 μm to 200 μm.

9. In paragraph 1, The above negative electrode comprises a negative electrode active material layer including a negative electrode active material, A cylindrical lithium secondary battery, wherein the negative active material includes a carbon-based active material.

10. In paragraph 1, The above negative electrode comprises a negative electrode active material layer including a negative electrode active material, A cylindrical lithium secondary battery, wherein the negative electrode active material is included in an amount of 90 to 99 wt% based on the total weight of the negative electrode active material layer.

11. In paragraph 1, A cylindrical lithium secondary battery, wherein the concentration of the lithium salt is 1.0 M to 1.5 M.

12. In paragraph 1, A cylindrical lithium secondary battery, wherein the lithium salt comprises at least one selected from the group consisting of LiPF6, LiClO4, LiAsF6, LiBF4, LiSbF6, LiAlO4, LiAlCl4, LiCF3SO3, LiC4F9SO3, LiN(C2F5SO3)2, LiN(C2F5SO2)2, LiN(CF3SO2)2, LiCl, and LiI.

13. In paragraph 1, A cylindrical lithium secondary battery, wherein the organic solvent comprises at least one selected from the group consisting of a cyclic carbonate-based organic solvent, a linear carbonate-based organic solvent, a linear ester-based organic solvent, and a cyclic ester-based organic solvent.

14. In paragraph 1, The above cylindrical lithium secondary battery is a cylindrical lithium secondary battery, which is a 46110 cell, a 48110 cell, a 4880 cell or a 4680 cell.

15. In paragraph 1, A cylindrical lithium secondary battery, wherein the above cylindrical lithium secondary battery includes a non-conductive portion on which an active material layer is not formed on at least a portion of the positive electrode and the negative electrode, and the non-conductive portion of the positive electrode and the non-conductive portion of the negative electrode are defined as electrode tabs.

16. In paragraph 15, A cylindrical lithium secondary battery, wherein the positive electrode uncoated portion and the negative electrode uncoated portion are formed along the direction in which the electrode assembly is wound on one end of each of the positive and negative electrodes, and a current collecting plate is coupled to each of the positive electrode uncoated portion and the negative electrode uncoated portion, and the current collecting plate is connected to an electrode terminal.

17. In paragraph 15, The above positive and negative electrode parts are processed into a plurality of independently foldable segments, A cylindrical lithium secondary battery, wherein at least some of the plurality of segments are bent toward the winding center of the electrode assembly.

18. In paragraph 17, A cylindrical lithium secondary battery, wherein at least some of the plurality of folded segments overlap on the upper and lower sides of the electrode assembly, and the current collecting plate is bonded to the plurality of overlapped segments.

19. A battery pack comprising a cylindrical lithium secondary battery according to any one of claims 1 to 18 as a unit cell.

Images