Title of the invention: positive electrode additive, method for manufacturing the same, positive electrode and lithium secondary battery including the same Technical field [One] Cross-reference with related application(s) [2] This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0062076 filed May 27, 2019, and all contents disclosed in the documents of the Korean patent application are included as part of this specification. [3] The present invention relates to a positive electrode additive, a method for manufacturing the same, and a positive electrode and a lithium secondary battery including the same. Background [4] In a lithium secondary battery, an electrode active material capable of reversible insertion and desorption of lithium ions is applied to a negative electrode and a positive electrode, respectively, and the movement of lithium ions is realized through an electrolyte. Create [5] However, during the initial charging and discharging of a lithium secondary battery (1 ST cycle charge-discarge), lithium ions that are inserted into the negative electrode (battery charge) and then detached (battery discharge) and detached from the positive electrode (battery charge) are recovered (battery charge-discarge). Lithium ions that cannot be discharged are inevitably generated. This is linked to the irreversible capacity of the two electrodes. [6] As the difference in irreversible capacity between the two electrodes increases, the initial efficiency of the positive electrode decreases, and the energy density gradually decreases during driving of the battery, so that the battery life may decrease. Detailed description of the invention Technical challenge [7] In one embodiment of the present invention, a material capable of effectively offsetting the initial irreversible capacity of the positive electrode and the negative electrode in a lithium ion battery, not causing a side reaction with the electrolyte, and further contributing to the stabilization of the negative electrode surface, is provided as a positive electrode additive. [8] In addition, another embodiment of the present invention provides a method of preparing the positive electrode additive of the embodiment under specific conditions. Means of solving the task [9] Advantages and features of the embodiments of the present invention, and a method of achieving them, will become apparent with reference to the embodiments described below in detail. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms. It is provided to fully inform those skilled in the art of the scope of the invention, and the invention is only defined by the scope of the claims. [10] Unless otherwise defined, technical terms and scientific terms used in the present invention have the meanings commonly understood by those of ordinary skill in the art to which this invention belongs. In addition, repeated descriptions of the same technical configuration and operation as in the prior art will be omitted. [11] Throughout the present specification, when a part is said to be "connected" with another part, this includes not only the case that it is "directly connected", but also the case that it is "electrically connected" with another element interposed therebetween. do. [12] Throughout this specification, when a member is said to be positioned "on" another member, this includes not only the case where the member is in contact with the other member, but also the case where another member exists between the two members. [13] In the entire specification of the present application, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. [14] The terms "about", "substantially", and the like, to the extent used throughout this specification, are used at or close to the numerical value when manufacturing and material tolerances specific to the stated meaning are presented, and To assist, accurate or absolute figures are used to prevent unreasonable use of the stated disclosure by unscrupulous infringers. [15] As used throughout the specification of the present application, the term "step (to)" or "step of" does not mean "step for". [16] In the entire specification of the present application, the term "combination(s) thereof" included in the expression of the Makushi format refers to one or more mixtures or combinations selected from the group consisting of components described in the expression of the Makushi format, It means to include at least one selected from the group consisting of the above constituent elements. [17] Throughout the present specification, the description of “A and/or B” means “A or B, or A and B”. [18] Anode additive [19] In one embodiment of the present invention, a compound represented by the following formula (1); A compound represented by the following formula (2); Lithium phosphate (Li 3 PO 4 ); provides a positive electrode additive for a lithium secondary battery comprising: [20] [Formula 1] [21] In Formula 1, M is a metal element forming a divalent cation, -0.2≤a≤0.2, 0.5≤b≤1.0, -0.2≤c≤0.2, [22] [Formula 2] [23] In Chemical Formula 2, 0.5≦e≦1.0, and M is the same as defined in Chemical Formula 1. [24] Since the compound represented by Formula 1 contains an excess of lithium compared to a conventional positive electrode active material having a level of 1 mole of lithium, lithium is released before the positive electrode active material during the initial charging of the lithium secondary battery to increase the irreversible capacity of the positive electrode and the negative electrode. It can be a positive electrode additive to offset and increase the initial charging capacity. [25] More details will be described later, but the compound represented by Formula 1 is a lithium raw material (eg, Li 2 O) and a nickel raw material (eg, (Ni d M 1-d O) It can be prepared by mixing according to the molar ratio and then heat treatment. [26] A number of unreacted raw materials may be present on the surface of the compound represented by Formula 1 prepared using only the lithium raw material and the nickel raw material. Among them, when the lithium raw material comes into contact with air or moisture , lithium by-products such as LiOH and LiCO 3 can be generated, and when the lithium by-product contacts the electrolyte in the battery, HF gas can be generated, which may cause battery deterioration. . [27] However, the lithium by-product does not participate in the electrochemical reaction in the battery, and generates gas (Gas) in the battery, thereby reducing the initial capacity of the battery and the initial charging/discharging efficiency. [28] In this regard, washing treatment to remove the unreacted raw materials is also one method, but lithium, etc. may be eluted from the compound represented by Formula 1 in the water washing process, and in the drying process after washing with water Rather, there is a possibility that by-products may increase again, and there is a limit to the removal of the lithium by-products by re-contamination after washing with water. [29] Accordingly, in the embodiment, the unreacted raw material is not washed with water, but is reacted with the phosphorus raw material to form a compound represented by Chemical Formula 2; And the lithium phosphate (Li 3 PO 4 ). [30] The compound represented by Formula 2 is a reaction product of the unreacted nickel raw material and the phosphorus raw material, and is a reaction product of the unreacted lithium raw material and the phosphorus raw material, and these may not generate lithium by-products. . [31] On the other hand, the compound represented by Formula 2 may be dissolved in the electrolyte in the battery, and may be reduced on the negative electrode surface during the formation of the battery to form a Ni layer, which degrades the electrochemical performance of the battery. It does not, but rather can contribute to stability improvement. [32] However, conditions for preparing the positive electrode additive of the embodiment need to be specially controlled. [33] According to an experimental example to be described later, the lithium raw material, the nickel raw material, and the phosphorus raw material are mixed together and then heat-treated at a temperature in the range of 600 to 900° C., and an inert gas must be supplied in this process. It is confirmed that the additive is being prepared. [34] Here, whether the raw materials are mixed together (the number of heat treatments), the heat treatment temperature, whether an inert gas is supplied during the heat treatment, and the supply flow rate must all satisfy the above-described conditions. [35] If any one of the above factors is not controlled, the compound represented by Formula 2 may not be produced. That is, when any one of the factors is not controlled, the compound represented by Formula 1; And the lithium phosphate (Li 3 PO 4 ); whether or not the additive may be prepared, the compound represented by Chemical Formula 1; A compound represented by Chemical Formula 2; And lithium phosphate (Li 3 PO 4 ); [36] A detailed description of such manufacturing conditions will be described later, and hereinafter, the configuration of the positive electrode additive of the embodiment, manufactured by controlling the manufacturing conditions, will be described in detail. [37] rescue [38] The positive electrode additive of the embodiment may include secondary particles of the first phase; And particles of the second phase positioned on the surface thereof. Here, the "particle" in the particles of the second phase may be a primary particle or a secondary particle in which the primary particles are aggregated. [39] Specifically, the compound represented by Formula 1 may form secondary particles of the first phase, and the lithium phosphate may be attached to the surface of the secondary particles as particles of the second phase. [40] In the case of the compound represented by Formula 2, the secondary particle may be distributed on the surface, the interior, or both. [41] Composition and content of each component [42] On the other hand, the positive electrode additive of the embodiment, the compound represented by the formula (1); A compound represented by Chemical Formula 2; And lithium phosphate (Li 3 PO 4 ); as well as Li 2 O and NiO. The form of their existence is not particularly limited. For example, the NiO particles and Li 2 O particles are in the form of a complex attached to the surface of the particles represented by Formula 1, or the NiO particles and the Li 2 O particles are separately from the compound particles represented by Formula 1 It can also be in the form of a mixture present. [43] These, in the process of manufacturing the positive electrode additive of the embodiment, the compound represented by the formula (2); And the lithium phosphate (Li 3 PO 4 ); it may correspond to an unreacted raw material that has not yet been converted. [44] Among them, Li 2 O is a factor that generates lithium by-products as described above, but it is possible to provide additional Li to the positive electrode together with the compound represented by Chemical Formula 1, and further increase the initial charging capacity of the positive electrode. Yes, it may not be specifically removed. [45] Of the total amount (100% by weight) of the positive electrode additive, the compound represented by Formula 1 is included in 80 to 90% by weight, the Li 3 PO 4 is included in 2 to 5% by weight, and the NiO is 5 to 15% by weight And the Li 2 O and the compound represented by Formula 2 may correspond to the balance. [46] Specifically, the compound represented by Formula 1; The lithium phosphate (Li 3 PO 4 ); The Li 2 O and the NiO are each crystalline, and can be detected by XRD (X-Ray Diffraction) by Cu Kα X-ray (X-rα). [47] In other words, when the core is qualitatively analyzed and quantitatively analyzed using X-Ray Diffraction (XRD) by Cu Kα X-ray (X-rα), the lithium phosphate (Li 3 PO 4 ); The presence or absence of each of the Li 2 O and the NiO, as well as the respective abundance can be confirmed. [48] In the experimental examples described below, the corresponding peaks for Li 2 NiO 2, Li 3 PO 4 , Li 2 O and NiO were confirmed by qualitative analysis of the X-ray diffraction analysis results of each of the positive electrode additives using a Bruker's Evaluation program . For these corresponding peaks, quantitative analysis between the two phases was performed by Rietveld refinement using the TOPAS program (Bruker-AXS, TOPAS4, Karlsruhe, Germany). Rietveld refinement was performed with the measured X-ray diffraction pattern and Li 2 NiO 2, Li 3 PO 4 , Li 2It is a feedback process that repeatedly adjusts the available variables until the patterns calculated from each structural model of O and NiO match best.In this process, the intensity and intensity ratio of the peaks as well as the positions of the diffraction peaks are analyzed. The content is quantitatively analyzed (see Rietveld, HML “Line Profiles of Neutron Powder-diffraction Peaks for Structure Refinement” Axta. Cryst., 22, 151-2, 1967 and Bish DL & Howard CJ, “Quantitative phase analysis using the Rietveld method" J. Appl. Cryst., 21, 86-81, 1988). [49] Meanwhile, although the compound represented by Formula 2 is also crystalline, it is a trace amount compared to other constituents, and thus it may be difficult to detect when XRD analysis of the positive electrode additive itself. However, in the experimental examples to be described later, as a result of XRD analysis after heat treatment by mixing only the nickel raw material and the phosphorus raw material, the compound represented in Formula 2 was detected, and through this, the positive electrode additive also represented in Formula 2 in trace amounts. It can be inferred that a compound that becomes [50] Further, as it is seen that a nickel metal layer is detected on the separated negative electrode surface after chemical charging of the lithium secondary battery to which the positive electrode active material is applied, the positive electrode active material contains the compound represented by Formula 2, and this material is dissolved in the electrolyte. After that, it can be inferred that it was reduced to nickel metal on the surface of the negative electrode during the chemical charging process of the battery. [51] Method for producing positive electrode additive [52] In another embodiment of the present invention , preparing a raw material mixture including a lithium raw material, a nickel raw material , and a phosphorus raw material; And heat-treating the raw material mixture at a temperature in the range of 600 to 900° C. in a reactor supplied with an inert gas. [53] Here, whether the raw materials are mixed together (the number of heat treatments), the heat treatment temperature, whether or not an inert gas is supplied during the heat treatment, and the supply flow rate all satisfy the above-described conditions, the positive electrode additive of the above-described embodiment can be finally obtained. have. [54] When the raw materials are not mixed together, a process of heat treatment by mixing only the lithium raw material and the nickel raw material to prepare the compound represented by Formula 1, and then mixing the phosphorus raw material to heat treatment may be considered. . However, in the process of applying heat treatment twice as described above, the compound represented by Formula 1 may be decomposed and then resynthesized, and thus the compound represented by Formula 2 may not be produced or may be produced in only a small amount. The amount of the compound represented by 1 may also be reduced. [55] In addition, even when the heat treatment is performed under the condition that the heat treatment temperature exceeds 900°C, or the inert gas is not supplied or the flow rate is less than 1.5 L/min, the structurally unstable compound represented by Formula 1 After decomposition, the compound may be resynthesized, and thus the compound represented by Formula 2 may not be produced or may be only a trace amount even if it is produced, and the amount of the compound represented by Formula 1 may be reduced. [56] Hereinafter, the content overlapping with the above description will be omitted, and the manufacturing method of the embodiment will be described in detail. [57] Raw material [58] In the raw material mixture, the phosphorus raw material may be 1 to 10% by weight, specifically 2 to 8% by weight, such as 3 to 7% by weight, based on the total amount (100% by weight) of the raw material mixture. In addition, in the case of the lithium raw material and the nickel raw material, the molar ratio of lithium (Li):nickel (Ni) by these may be 3:1 to 3:2, and the Li:Ni of Formula 1 Although the molar ratio of 2:1 is theoretically considered, a range that can be adjusted is suggested in consideration of the fact that there are many cases where raw materials do not react or are lost in the actual manufacturing process. Therefore, the above range is only an example, and may be appropriately adjusted in consideration of theory and practice. [59] The phosphorus raw material may be a dibasic ammonium phosphate ((NH 4 ) 2 HPO 4 ), a monobasic ammonium phosphate (NH 4 H 2 PO 4 ), or a mixture thereof, and the lithium raw material is Li 2 O, LiOH, or a mixture thereof may be included, and the nickel raw material may include a compound represented by the following formula (3): [60] [Formula 3] [61] In Formula 3, M is a metal element forming a divalent cation, and 0≤d≤0.5. [62] Heat treatment process [63] In the heat treatment step, the inert gas may include nitrogen (N 2 ) gas, which may be supplied to the reactor at a flow rate of 1.5 to 2.5 L/min. [64] Specifically, the step of heat-treating the raw material mixture to a temperature within the range of 600 to 900 ℃ in the reactor to which the inert gas is supplied; may proceed as follows. [65] a) reacting the lithium raw material and the nickel raw material to produce a compound represented by the following formula (1); [66] b) reacting the nickel raw material and the phosphorus raw material not reacted in step a) to produce a compound represented by the following formula (2); [67] c) generating lithium phosphate (Li 3 PO 4 ) by reacting the lithium raw material not reacted in step a) and the phosphorus raw material not reacting in step b) ; And [68] d) A positive electrode comprising a compound represented by Formula 1 produced in step a), a compound represented by Formula 2 produced in step b), and lithium phosphate (Li 3 PO 4 ) produced in step c) Steps to obtain an additive: [69] [Formula 1] [70] In Formula 1, M is a metal element forming a divalent cation, -0.2≤a≤0.2, 0.5≤b≤1.0, -0.2≤c≤0.2, [71] [Formula 2] [72] In Chemical Formula 2, 0.5≦e≦1.0, and M is the same as defined in Chemical Formula 1. [73] The positive electrode additive obtained in step d) may include a lithium raw material material, a nickel raw material material, or a mixture thereof not reacted in the above a) to c), and has been described above. [74] On the other hand, while the compound represented by Formula 2 is produced in step b), Ni 3 P 2 O 8 may also be produced, and this may also be included in the positive electrode additive obtained in step d), but the embodiment Is not limited thereto. [75] In this case, the heat treatment is preferably performed for 5 to 11 hours in the temperature range, and more specifically, may be performed for 8 to 10 hours. [76] If it is carried out for a too short time outside the above range, a sufficient reaction does not occur, and if it is carried out for a too long time, the structurally unstable compounds represented by Formula 1 are decomposed and then re-synthesized. Compounds may not be produced. [77] Positive electrode mixture, positive electrode, and lithium secondary battery [78] In still other embodiments of the present invention, a positive electrode mixture, a positive electrode, and a lithium secondary battery including the above positive electrode additive are provided. [79] The above-described positive electrode additive can be applied to a conventional positive electrode mixture in the art, and when a positive electrode manufactured from such a positive electrode mixture is prepared and implemented as a lithium secondary battery by combining constituent elements such as a negative electrode and an electrolyte, the initial irreversibility of the positive electrode and the negative electrode The capacity is effectively canceled, gas generation is suppressed, and the cathode surface can be stabilized by the Ni layer. [80] In the experimental examples to be described later, in order to confirm the effect of forming a Ni layer on the surface of the negative electrode by the positive electrode additive of the embodiment, the positive electrode active material is not included in the positive electrode mixture, and a positive electrode additive, a conductive material, and a binder are included. A positive electrode mixture was also prepared (Examples 1 to 3). [81] The positive electrode additive of one embodiment is applied with any positive electrode active material and negative electrode active material, during formation of a battery, the compound represented by Formula 2 is dissolved in an electrolyte solution containing a lithium salt and an organic solvent to the surface of the negative electrode. It is possible to be reduced to Ni metal. [82] The conditions for chemically charging the lithium secondary battery to which the positive electrode additive is applied, and the positive electrode active material and the negative electrode active material applied together with the positive electrode additive are not particularly limited. An active material was used, and graphite was used as a negative electrode active material, and a condition for chemical conversion to 4.2 V was used. [83] As a result, it was confirmed that 200 to 4000 ppm of Ni metal was detected from the separated negative electrode surface. This is any one of the factors that should be limited in preparing the positive electrode additive of the embodiment-that is, whether raw materials are mixed together (number of heat treatments), heat treatment temperature, whether an inert gas is supplied during heat treatment, and the supply flow rate Even if it is not satisfied, it is a value ranging from 2 times to 2000 times compared to that the Ni metal detected under the same conditions is less than 100 ppm. [84] The Ni metal reduced to the negative electrode surface as described above does not degrade the electrochemical performance of the battery, but rather stabilizes the negative electrode surface, thereby enabling stable driving of the battery. [85] On the other hand, the positive electrode additive of one embodiment may be prepared as a positive electrode mixture together with the positive electrode active material (Example 4), and at this time, the weight ratio of the positive electrode additive and the positive electrode active material of the one embodiment may be 1:99 to 35:65. In addition, the content of the Ni layer formed on the surface of the negative electrode may be reduced in proportion to the mixing ratio. [86] Specifically, when the cathode active material is not included in the cathode mixture, the amount of Ni detected is 3000 to 4000 ppm, but when the cathode active material is included in a weight ratio of 10:90, the amount of Ni is 200 to 3000 ppm. Ni can be detected. This is also a range predictable by the equation of (3000 to 4000 ppm) * (positive electrode additive)/(positive electrode additive + positive electrode active material). [87] In the lithium secondary battery of the embodiment, in addition to the above-described positive electrode additive and positive electrode mixture, it may be generally implemented according to matters known in the art. [88] Hereinafter, matters generally known in the art are briefly presented, but this is only an example, and thus the positive electrode mixture of the exemplary embodiment is not limited thereto. [89] The positive electrode active material is not particularly limited as long as it is a material capable of reversible insertion and desorption of lithium ions. Metals of, for example, cobalt, manganese, nickel or combinations thereof; And lithium; It may be one containing at least one of the composite oxide. [90] For a more specific example, as the positive active material, a compound represented by any one of the following formulas may be used. Li a A 1-b R b D 2 (where 0.90≦a≦1.8 and 0≦b≦0.5); Li a E 1-b R b O 2-c D c (where 0.90≦a≦1.8, 0≦b≦0.5, and 0≦c≦0.05); LiE 2-b R b O 4-c D c (where 0≦b≦0.5, 0≦c≦0.05); Li a Ni 1-bc Co b R c D α(In the above formula, 0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.05 and 0<α≦2); Li a Ni 1-bc Co b R c O 2-α Z α (wherein 0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.5, 0 ≤ c ≤ 0.05 and 0 <α <2); Li a Ni 1-bc Co b R c O 2-α Z 2 (wherein 0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.5, 0 ≤ c ≤ 0.05 and 0 <α <2); Li a Ni 1-bc Mn b R c D α(In the above formula, 0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.05 and 0<α≦2); Li a Ni 1-bc Mn b R c O 2-α Z α (wherein 0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.5, 0 ≤ c ≤ 0.05 and 0 <α <2); Li a Ni 1-bc Mn b R c O 2-α Z 2 (wherein 0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.5, 0 ≤ c ≤ 0.05 and 0 <α <2); Li a Ni b E c G d O 2(In the above formula, 0.90≦a≦1.8, 0≦b≦0.9, 0≦c≦0.5, and 0.001≦d≦0.1.); Li a Ni b Co c Mn d GeO 2 (wherein, 0.90≦a≦1.8, 0≦b≦0.9, 0≦c≦0.5, 0≦d≦0.5, and 0.001≦e≦0.1.); Li a NiG b O 2 (wherein, 0.90≦a≦1.8 and 0.001≦b≦0.1); Li a CoG b O 2 (wherein, 0.90≦a≦1.8 and 0.001≦b≦0.1); Li a MnG b O 2 (wherein, 0.90≦a≦1.8 and 0.001≦b≦0.1.); Li a Mn 2G b O 4 (wherein, 0.90≦a≦1.8 and 0.001≦b≦0.1); QO 2 ; QS 2 ; LiQS 2 ; V 2 O 5 ; LiV 2 O 5 ; LiTO 2 ; LiNiVO 4 ; Li (3-f) J 2 (PO 4 ) 3 (0≦f≦2); Li (3-f) Fe 2 (PO 4 ) 3 (0≦f≦2); And LiFePO 4 . [91] In the above formula, A is Ni, Co, Mn, or a combination thereof; R is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, rare earth elements or combinations thereof; D is O, F, S, P or a combination thereof; E is Co, Mn, or a combination thereof; Z is F, S, P or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; Q is Ti, Mo, Mn or a combination thereof; T is Cr, V, Fe, Sc, Y or a combination thereof; J is V, Cr, Mn, Co, Ni, Cu, or a combination thereof. [92] Of course, one having a coating layer on the surface of the compound may be used, or a mixture of the compound and a compound having a coating layer may be used. The coating layer may include, as a coating element compound, oxide, hydroxide of a coating element, oxyhydroxide of a coating element, oxycarbonate of a coating element, or hydroxycarbonate of a coating element. The compound constituting these coating layers may be amorphous or crystalline. As a coating element included in the coating layer, Mg, Al, Co, K, Na, Ca, Si, Ti, V, Sn, Ge, Ga, B, As, Zr, or a mixture thereof may be used. The coating layer formation process is a method that does not adversely affect the physical properties of the positive electrode active material by using these elements in the compound (e.g., spray coating, dipping method, etc.), any coating method may be used. The detailed description will be omitted because it is a content that can be well understood by those in the field. [93] The positive electrode mixture of the embodiment may further include a conductive material, a binder, or a mixture thereof. The conductive material is used to impart conductivity to the electrode, and in the battery constituted, any material can be used as long as it does not cause chemical change and is an electron conductive material, such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen Metal powders such as black, carbon fiber, copper, nickel, aluminum, and silver, metal fibers, etc. may be used, and conductive materials such as polyphenylene derivatives may be used alone or in combination of one or more. [94] The binder adheres well the positive electrode active material particles to each other, and also plays a role in attaching the positive electrode active material to the current collector well, and representative examples thereof include polyvinyl alcohol, carboxymethylcellulose, hydroxypropylcellulose, diacetylcellulose, and polyvinyl Chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, polymer containing ethylene oxide, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene- Butadiene rubber, acrylated styrene-butadiene rubber, epoxy resin, nylon, etc. may be used, but the present invention is not limited thereto. [95] The positive electrode may include a positive electrode current collector; And a positive electrode mixture layer positioned on the positive electrode current collector and including the positive electrode mixture described above. [96] Specifically, the positive electrode may be prepared by applying an electrode mixture, which is a mixture of a positive electrode active material, a conductive material, and/or a binder, on a positive electrode current collector, followed by drying, and if necessary, a filler may be further added to the mixture. have. [97] The positive electrode current collector may generally have a thickness of 3 to 500 µm. Such a positive electrode current collector is not particularly limited as long as it has high conductivity without causing chemical changes to the battery, for example, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel. Surface treatment of carbon, nickel, titanium, silver, or the like may be used on the surface of. The current collector may increase the adhesion of the positive electrode active material by forming fine irregularities on its surface, and various forms such as films, sheets, foils, nets, porous bodies, foams, and nonwoven fabrics are possible. [98] The conductive material is typically added in an amount of 1 to 50% by weight based on the total weight of the mixture including the positive electrode active material. Such a conductive material is not particularly limited as long as it has conductivity without causing chemical changes in the battery, and examples thereof include graphite such as natural graphite or artificial graphite; Carbon blacks such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskey such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives may be used. [99] Meanwhile, the elastic graphite-based material may be used as a conductive material or may be used together with the above materials. [100] The binder is a component that aids in bonding of an active material and a conductive material and bonding to a current collector, and is typically added in an amount of 1 to 50% by weight based on the total weight of the mixture including the positive electrode active material. Examples of such a binder include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, and various copolymers. [101] The filler is selectively used as a component that suppresses the expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical changes to the battery, and examples thereof include olefin-based polymers such as polyethylene and polypropylene; Fibrous materials such as glass fiber and carbon fiber are used. [102] The negative electrode may include a current collector and a negative active material layer formed on the current collector, and the negative active material layer may include a negative active material. [103] As the negative active material, a carbon-based negative active material, lithium metal, lithium metal alloy, Si, SiO x (0