Title of the invention: A positive electrode for a solid electrolyte battery and a solid electrolyte battery comprising the same Technical field [One] The present invention relates to a positive electrode for a solid electrolyte battery and a solid electrolyte battery including the same, and more particularly, a positive electrode for a solid electrolyte battery capable of lowering an interface resistance between a positive electrode active material layer and a separator while increasing adhesion to a positive electrode current collector It relates to a solid electrolyte battery comprising the same. [2] This application is an application for claiming priority for Korean Patent Application No. 10-2018-0048584 filed on April 26, 2018, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference. Background [3] A lithium ion battery using a liquid electrolyte has a structure in which a negative electrode and a positive electrode are partitioned by a separator, so if the separator is damaged by deformation or external shock, a short circuit may occur, which may lead to a risk of overheating or explosion. Therefore, it can be said that the development of a solid electrolyte that can secure safety in the field of lithium ion secondary batteries is a very important task. [4] A lithium secondary battery using a solid electrolyte has advantages in that the safety of the battery is increased, leakage of an electrolyte solution can be prevented, so that the reliability of the battery is improved, and it is easy to manufacture a thin battery. In addition, since lithium metal can be used as a negative electrode, energy density can be improved. Accordingly, it is expected to be applied to a high-capacity secondary battery for an electric vehicle as well as a small secondary battery, thus attracting attention as a next-generation battery. [5] On the other hand, in the case of a battery to which a solid electrolyte is applied, since both the electrode and the polymer separator (membrane) are in a solid state, and there is no liquid electrolyte, the voids generated at the interface between the electrode and the separator exist as a dead space without ion conductivity. do. In particular, when the electrode surface is uneven due to the shape of the active material, aggregation of the conductive material, and lifting of the binder, more voids are generated, resulting in increased resistance between the electrode and the separator, and may adversely affect the battery life performance. [6] In addition, the phenomenon of the formation of cracks in the positive electrode active material is one of the well-known causes of life deterioration in conventional lithium-ion secondary batteries, and occurs from the beginning of the cycle, and is known to occur under all conditions regardless of the type and potential of the active material. . In the case of a solid electrolyte battery to which a solid electrolyte is applied, unlike a battery to which a liquid electrolyte is applied, it is impossible for the electrolyte to penetrate into the cracks of the positive electrode active material generated during the cycle. As a result, there is a problem in that a path required for ion conduction is cut and the life of the battery is rapidly shortened. [7] In order to solve this problem, there are many attempts to fill the interface between the electrode and the separator by adding a part of a liquid ion conductive material (or electrolyte) in a solid electrolyte battery.In order to use a liquid material, the injection process must be performed after cell assembly. However, there is a disadvantage in that an excessive amount must be injected in order for the liquid substance to exist at the interface between the separator and the electrode. [8] In order to overcome these drawbacks, liquid substances such as electrolytes and additives can be absorbed in the polymer separator in advance, and the polymer separator absorbing the electrolyte is softened to reduce the interface resistance between the separator and the electrode. However, since the softened separator has very weak mechanical properties, it is difficult to assemble the assembly process, and it is difficult to apply practically because the adhesive strength between the electrode active material layer and the current collector is weakened. Detailed description of the invention Technical challenge [9] Therefore, the problem to be solved by the present invention is to soften the separator by making the liquid material present only in the electrode without a separate injection process such as an electrolyte, reducing the interface resistance between the separator and the electrode, while reducing the adhesion between the electrode active material layer and the current collector. It is possible to improve the performance of the battery by maintaining the silver as it is, and in a solid electrolyte battery system, like a liquid electrolyte battery, a positive electrode for a solid electrolyte battery that allows the electrolyte to penetrate into the crack formed in the positive electrode active material, and a solid electrolyte battery including the same ( Solid Electrolyte Batter) or All Solid State Battery. Means of solving the task [10] An aspect of the present invention provides a positive electrode for a solid electrolyte battery according to the following embodiments. [11] The first embodiment, [12] Positive electrode current collector; [13] A first positive electrode active material layer formed on at least one surface of the positive electrode current collector and including a first positive electrode active material, a first solid electrolyte, and a first electrolyte salt; And [14] A second positive electrode active material layer formed on the first positive electrode active material layer and comprising a second positive electrode active material, a second solid electrolyte, a second electrolyte salt, and a plasticizer; and [15] The plasticizer relates to a positive electrode for a solid electrolyte battery, characterized in that the melting point is 30 ℃ to 130 ℃. [16] In the second embodiment, in the first embodiment, [17] The plasticizer relates to a positive electrode for a solid electrolyte battery, characterized in that the melting point is 35 ℃ to 65 ℃. [18] In the third embodiment, in any one of the above-described embodiments, [19] The plasticizer is ethylene carbonate (EC), polyethylene glycol (PEG) having a weight average molecular weight of 1,000 or more, succinonitrile (SN), cyclic phosphate (CP), or among these It relates to a positive electrode for a solid electrolyte battery, characterized in that two or more. [20] In the fourth embodiment, in any one of the above-described embodiments, [21] The plasticizer relates to a positive electrode for a solid electrolyte battery, characterized in that it is contained in an amount of 0.1 to 30% by weight, based on the total weight of the second positive electrode active material layer. [22] In the fifth embodiment, in any one of the above-described embodiments, [23] Each of the first positive electrode active material layer or the second positive electrode active material layer further comprises a conductive material and a binder, and relates to a positive electrode for a solid electrolyte battery. [24] In the sixth embodiment, in any one of the above-described embodiments, [25] It relates to a positive electrode for a solid electrolyte battery, wherein the weight ratio of the first positive electrode active material layer and the second positive electrode active material layer is 1:99 to 99:1. [26] Another aspect of the present invention provides a solid electrolyte battery according to the following embodiments. [27] The seventh embodiment, [28] It relates to a solid electrolyte battery comprising a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, [29] The positive electrode relates to a solid electrolyte battery, which is a positive electrode for a solid electrolyte battery according to any one of the first to sixth embodiments. [30] In the eighth embodiment, in the seventh embodiment, [31] The solid electrolyte battery is activated at a temperature in the range of above the melting point of the plasticizer and below 130 °C, [32] The plasticizer relates to a solid electrolyte battery, characterized in that it exists in a liquid state after the solid electrolyte battery is activated. [33] In the ninth embodiment, in the 7th or 8th embodiment, [34] It relates to a solid electrolyte battery, wherein the liquid plasticizer penetrates into the crack formed in the second positive electrode active material. [35] In the tenth embodiment, in any one of the above-described embodiments, [36] The separator is a solid electrolyte membrane, and the negative electrode relates to a solid electrolyte battery, characterized in that the lithium metal. [37] In the eleventh embodiment, in any one of the above-described embodiments, [38] It relates to a solid electrolyte battery, characterized in that the voids in the second positive electrode active material layer are filled with the liquid plasticizer. [39] Another aspect of the present invention provides a battery module or battery pack according to the following embodiments. [40] The twelfth embodiment, [41] It relates to a battery module comprising the solid electrolyte battery according to any one of the above-described embodiments as a unit cell. [42] The thirteenth embodiment relates to a battery pack comprising the battery module according to the above-described embodiment. Effects of the Invention [43] According to an embodiment of the present invention, since the first positive electrode active material layer in contact with the positive electrode current collector does not contain a plasticizer, softening of the solid electrolyte does not occur, so that the mechanical properties of the active material layer are maintained, and adhesion to the positive electrode current collector While this is maintained, a plasticizer is contained in the second positive electrode active material layer in contact with the separator, and softening of the solid electrolyte occurs, so that the interface resistance between the active material layer and the separator can be lowered. [44] Furthermore, a specific plasticizer additionally provided in the second positive electrode active material layer penetrates into the crack of the positive electrode active material generated during the cycle of the solid electrolyte battery, thereby imparting ionic conductivity to the inside of the crack. [45] As a result, a path required for ion conduction due to the occurrence of cracks in the positive electrode active material is maintained, so that the lifespan characteristics of the solid electrolyte battery can be prevented from deteriorating. [46] In addition, the plasticizer of the present application has high ionic conductivity, so that the output performance of the battery can be further improved. In addition, the oxidation reactivity is also higher than the positive electrode use potential, so it can be used stably in the positive electrode. Brief description of the drawing [47] The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of ​​the present invention together with the content of the above-described invention, so the present invention is limited to the matters described in such drawings. It is limited and should not be interpreted. [48] 1 is a view schematically showing a cross-section of a positive electrode to which a conventional solid electrolyte is applied. [49] 2 is a schematic cross-sectional view of a positive electrode to which a solid electrolyte is applied according to an embodiment of the present application. [50] 3 is a graph showing capacity retention rates of coin cells according to Examples 1 and 2 and Comparative Examples. Mode for carrying out the invention [51] Hereinafter, the present invention will be described in detail with reference to the drawings. The terms or words used in the present specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventor may appropriately define the concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of ​​the present invention based on the principle that there is. [52] Therefore, the embodiments described in the present specification and the configurations described in the drawings are only the most preferred embodiments of the present invention, and do not represent all the technical spirit of the present invention, and thus various It should be understood that there may be equivalents and variations. [53] [54] A positive electrode for a solid electrolyte battery according to an aspect of the present invention includes a positive electrode current collector; A first positive electrode active material layer formed on at least one surface of the positive electrode current collector and including a first positive electrode active material, a first solid electrolyte, and a first electrolyte salt; And a second positive electrode active material layer formed on the first positive electrode active material layer and including a second positive electrode active material, a second solid electrolyte, a second electrolyte salt, and a plasticizer, wherein the plasticizer has a melting point of 30° C. It is characterized in that 130 ℃. [55] Since the melting point of the plasticizer is 30°C to 130°C, the plasticizer exists in a solid state at room temperature of about 15 to 25°C. On the other hand, at a temperature equal to or higher than the melting point of the plasticizer, the plasticizer phase changes into a liquid phase, resulting in fluidity. The plasticizer phase-changed into a liquid phase can penetrate into the cracks formed in the second positive electrode active material. [56] In general, after fabricating a battery, a commercial battery is completed only after a high-temperature activation step. [57] In this case, the high-temperature activation step must be a high temperature equal to or higher than the melting point of the plasticizer, and a temperature higher than room temperature of 30°C or higher, preferably 35°C or higher, most preferably 50°C or higher, and 130°C or lower, preferably 100°C. Hereinafter, most preferably, the battery may be left without charging and discharging for a predetermined time at a temperature of 90° C. or less, or may be left while charging and discharging. [58] The predetermined time may be 10 seconds to 48 hours, preferably 1 minute to 24 hours, and most preferably 1 hour to 8 hours. [59] On the other hand, when the temperature of activation exceeds 130° C., curing of a binder that may be included in the electrode active material layer may occur, and it may be difficult to exhibit performance as an electrode. Therefore, the temperature of activation must be 130° C. or less, and therefore, the melting point of the plasticizer must be 130° C. or less. [60] In the present application, a solid electrolyte battery including the above-described positive electrode, separator, and negative electrode is manufactured, and then subjected to a high-temperature activation step, wherein the high-temperature activation step includes a temperature range of not less than the melting point of the plasticizer and not more than 130 °C. In, it can be achieved by leaving the battery for a predetermined time, that is, 10 seconds to 48 hours without charging and discharging. [61] Meanwhile, in general, cracks are generated in the positive electrode active material during the cycle of the battery, and the plasticizer of the present application is converted to a liquid state through the above-described high-temperature activation step, and is formed in the second positive electrode active material during the cycle of the battery. It penetrates into the crack, and thereby, it is possible to impart ionic conductivity to the inside of the crack as in the case of a liquid electrolyte battery. Thereby, it is possible to prevent deterioration of the life characteristics of the solid electrolyte battery. [62] In particular, in the present invention, a plasticizer is not included in the first positive electrode active material layer in contact with the positive electrode current collector, and the plasticizer is included in the second positive electrode active material layer in contact with the separator. [63] 1 is a view schematically showing a cross-section of a positive electrode to which a conventional solid electrolyte is applied, and FIG. 2 is a view schematically showing a cross-section of a positive electrode to which a solid electrolyte is applied according to an embodiment of the present disclosure. Referring to FIGS. 1 and 2, in the case of a battery to which a conventional solid electrolyte is applied, the void 4 existing at the interface between the positive electrode active material layer 2 and the separator 3 exists as a dead space without ion conductivity. In particular, when the electrode surface is uneven due to the shape of the active material, aggregation of the conductive material, and the lifting of the binder, more voids are generated, increasing the resistance between the electrode and the separator, and adversely affecting the life performance of the battery. [64] However, according to the present invention, since softening of the solid electrolyte does not occur in the first positive electrode active material layer 20, mechanical properties of the active material layer are maintained, so that physical adhesion to the current collector 10 can be maintained, and the second positive electrode In the active material layer 22, the solid electrolyte is softened, so that the interface resistance between the second positive electrode active material layer 22 and the separator 30 can be lowered. [65] The plasticizer may have a melting point of 30°C to 130°C, and preferably a melting point of 35°C to 65°C. To further explain, the plasticizer exists in a solid state at room temperature, but any material that can change to a liquid state at a high temperature can be used. Polyethylene glycol (PEG) having a weight average molecular weight of 1,000 or more with a point of about 35 ℃, succinonitrile (SN) having a melting point of about 57 ℃, and cyclic phosphate (CP) having a melting point of about 65 ℃ ) Or a mixture of two or more of them. [66] On the other hand, propylene carbonate (PC) with a melting point of about -49 ℃, polyethylene glycol (PEG) with a weight average molecular weight of 600 or less, and polyethylene glycol dimethyl ether with a melting point of -23 ℃ ether, PEGDME), dioctyl phthalate (DOP) with a melting point of -50 °C, diethyl phthalate (DEP) with a melting point of -4 °C, etc. are present in a liquid state at room temperature. It is difficult to apply as a plasticizer of the invention. [67] As an example of the plasticizer according to the present invention, the melting point of ethylene carbonate is about 37°C. The second positive electrode active material slurry containing ethylene carbonate is slightly higher than the melting point of ethylene carbonate, but is prepared at a temperature lower than the temperature at the time of subsequent activation, so that the ethylene carbonate may exist in a liquid state in the slurry. In the ethylene carbonate can be uniformly dispersed. Later, when the slurry is coated on the first positive electrode active material layer and dried, the dispersion medium is volatilized and removed, but the ethylene carbonate remains without volatilization, changes to a solid state at room temperature, and is uniformly distributed around the second positive electrode active material in the positive electrode. . At this time, the drying of the second positive electrode active material slurry is vacuum-dried at a temperature equal to or lower than the melting point of the ethylene carbonate, preferably at room temperature, so that the ethylene carbonate does not change to a liquid state and exists in a solid state. [68] In addition, the solid electrolyte battery including the second positive electrode active material layer prepared from the second positive electrode active material slurry is exposed to a high temperature of 37° C. or higher, which is the melting point of ethylene carbonate, through a high-temperature activation process, thereby surrounding the second positive electrode active material. Distributed ethylene carbonate changes to a liquid state again, reacts with the electrolyte salt in the positive electrode, and thereafter exists in a liquid state even at 37°C or less. During the cycle of the battery, cracks are generated in the positive electrode active material, and the ethylene carbonate penetrates into the cracks, so that ionic conductivity can be imparted to the inside of the cracks as in the liquid electrolyte battery. Thereby, it is possible to prevent deterioration of the life characteristics of the solid electrolyte battery. [69] In addition, the ethylene carbonate converted to a liquid phase reacts with the second solid electrolyte to soften the second solid electrolyte. The softened second positive electrode active material layer itself has excellent ion conductivity, but adheres well to the separator, thereby reducing the interface resistance between the second positive electrode active material layer and the separator. [70] The ethylene carbonate is used in a general non-aqueous electrolyte solution, and can be applied to most batteries, and has an advantage of not having impurities. In particular, such ethylene carbonate has high ion conductivity, so that the output performance of the battery can be further improved. In addition, the oxidation reactivity (6.2 V) is also higher than the anode use potential, so it can be used stably at the anode. [71] In addition to the ethylene carbonate, polyethylene glycol, succinonitrile (SN), and cyclic phosphate (CP) having a weight average molecular weight of 1,000 or more used as plasticizers of the present application are similar to the above-described effects as ethylene carbonate. Can exert. At this time, depending on the type of the plasticizer, the temperature at which the second positive electrode active material slurry is prepared or the temperature at which the battery is activated later may vary, and may be appropriately selected according to the melting point of the plasticizer. [72] Meanwhile, the plasticizer may be included in an amount of 0.1 to 30% by weight, or 0.5 to 25% by weight, or 0.7 to 20% by weight, based on the total weight of the second positive electrode active material layer. [73] If the content of the plasticizer is less than the above numerical range, the effect is insignificant, and if it exceeds the numerical range, it becomes similar to a battery to which a liquid electrolyte is applied, and the safety improvement effect is negligible, which is not preferable. [74] [75] In addition, the plasticizer may be dissolved in the second positive electrode active material slurry and dispersed in a liquid state, or may be dispersed in a solid state. [76] Meanwhile, in the present invention, any material that can be used as a positive electrode active material for a lithium secondary battery may be used as the first positive electrode active material or the second positive electrode active material. For example, layered compounds such as lithium cobalt oxide (LiCoO 2 ) and lithium nickel oxide (LiNiO 2 ), or compounds substituted with one or more transition metals; 　Lithium manganese oxides such as the formula Li 1 + x Mn 2 - x O 4 　 (wherein x is 0 to 0.33), LiMnO 3 , LiMn 2 O 3 , LiMnO 2, etc.; Lithium copper oxide (Li 2 CuO 2 ); LiV 3 O 8 , LiFe 3 O 4 , V 　Vanadium oxides such as 2 O 5 and Cu 2 V 2 O 7 ; 　Ni site type lithium nickel oxide represented by the formula LiNi 1 - x M x O 2 (here, M = Co, Mn, Al, Cu, Fe, Mg, B or Ga, and x = 0.01 to 0.3); Formula LiMn 2 - x M x O 2　(where M = Co, Ni, Fe, Cr, Zn or Ta, and x = 0.01 ~ 0.1) or Li 2 Mn 3 MO 8　(where M = Fe, Co, A lithium manganese composite oxide represented by Ni, Cu or Zn); LiNi x Mn 2 - lithium manganese composite oxide of spinel structure represented by x O 4 ; LiMn 2 O 4 in which part of Li in the formula is substituted with alkaline earth metal ions ; Disulfide compounds; Fe 2 (MoO 4 ) 3 , LiNi 0 . 8 Co 0 . 1 Mn 0 . 1 O 2 and the like may be included. However, it is not limited only to these. [77] Meanwhile, the first positive electrode active material layer and the second positive electrode active material layer satisfy a weight ratio of 1:99 to 99:1, preferably 30:70 to 70:30, more preferably 30:70 to 50:50. It can be. As described above, battery performance can be appropriately changed by varying the ratio of the positive electrode active material layer. [78] In addition, the first positive electrode active material layer and the second positive electrode active material layer may have different positive electrode active materials, and the types of conductive materials and binders that may be additionally included may be different, and the composition ratio of the constituent materials Can also be different. [79] Meanwhile, the first positive electrode active material layer or the second positive electrode active material layer may further include a conductive material and a binder according to the type of the solid electrolyte or desired performance, and the amount of the conductive material that may be included is the first and second positive electrode active material layers. 2 Based on the total weight of the positive electrode active material layer, it may be 0.1 to 20% by weight, preferably 1 to 10% by weight, and the content of the binder is 0.1 to 20% by weight based on the total weight of the first and second positive electrode active material layers. %, preferably 1 to 10% by weight. [80] The conductive material is not particularly limited as long as it has conductivity without causing chemical changes to 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 whiskers such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; It may include one or a mixture of two or more selected from conductive materials such as polyphenylene derivatives. [81] And, as the binder, for example, polyvinylidene fluoride-hexafluoropropylene (PVDF-co-HFP), polyvinylidene fluoride (PVDF), polyacrylonitrile, Various types of binders such as polymethyl methacrylate, styrene-butadiene rubber (SBR), and carboxyl methyl cellulose (CMC) can be used. [82] In addition, as the solid electrolyte of the present invention, it is preferable to use a solid electrolyte having excellent oxidation stability. Since the solid electrolyte of the present invention mainly serves to transfer lithium ions within the electrode, any material having high ionic conductivity, for example, 10 -5 S/cm or more, preferably 10 -4 S/cm or more It can be used, and is not limited to a specific ingredient. [83] At this time, the solid electrolyte is a polymer solid electrolyte formed by adding a polymer resin to a solvated electrolyte salt, or a polymer containing an organic electrolyte, an ionic liquid, a monomer, or an oligomer containing an organic solvent and an electrolyte salt in the polymer resin. It may be a gel electrolyte, and further, it may be a sulfide-based solid electrolyte having high ionic conductivity or an oxide-based solid electrolyte having excellent stability. [84] At this time, the polymer solid electrolyte is, for example, a polyether polymer, a polycarbonate polymer, an acrylate polymer, a polysiloxane polymer, a phosphazene polymer, a polyethylene derivative, an alkylene oxide derivative, a phosphate ester polymer, and a polyetchant. Lysine (agitation lysine), polyester sulfide, polyvinyl alcohol, polyvinylidene fluoride, a polymer containing an ionic dissociation group, and the like may be included. In addition, the polymer solid electrolyte is a polymer resin, a branched copolymer in which an amorphous polymer such as PMMA, polycarbonate, polysiloxane (pdms) and/or phosphazene is copolymerized with a comonomer in a PEO (polyethylene oxide) main chain, a comb polymer resin (comb-like polymer) and a crosslinked polymer resin may be included, and may be a mixture of the polymers. [85] In addition, the polymer gel electrolyte includes an organic electrolyte solution containing an electrolyte salt and a polymer resin, and the organic electrolyte solution includes 60 to 400 parts by weight based on the weight of the polymer resin. The polymer applied to the gel electrolyte is not limited to a specific component, but, for example, polyether-based, PVC-based, PMMA-based, polyacrylonitrile (PAN), polyvinylidene fluoride (PVdF), and polyvinyl fluoride It may include poly(vinylidene fluoride-hexafluoro propylene: PVdF-HFP, etc.), and may be a mixture of the above polymers. [86] In addition, the electrolyte salt may be represented by Li + X - as an ionizable lithium salt . These lithium salts are preferably LiTFSI, LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , LiSCN, LiCF 3 CO 2 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiN(SO 2 CF 3 ) 2 , LiN(SO 2 C 2 F 5 ) 2 , LiC 4 F 9 SO 3 , LiC(CF 3 SO 2 ) 3 , (CF 3 SO 2 )·2NLi, lithium chloroborate, lower aliphatic lithium carboxylate, 4-phenyl borate lithium imide And it may be one selected from the group consisting of a combination thereof. More preferably, it may be LiTFSI (lithium bistrifluoromethanesulfonimide). [87] In addition, the dispersion medium for a positive electrode active material slurry of the present invention may be used without particular limitation as long as it is generally used for preparing a positive electrode active material slurry. Specifically, it may be isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, water, and the like. [88] [89] On the other hand, in the positive electrode for a solid electrolyte battery according to the present invention, a first positive electrode active material layer is formed by coating the first positive electrode active material slurry on a positive electrode current collector and then drying the slurry to form a second positive electrode active material layer. After coating the positive electrode active material slurry and drying it, a positive electrode having the first and second positive electrode active material layers formed thereon is prepared. [90] In this case, the coating method may use a known coating method such as slot die, gravure coating, spin coating, spray coating, roll coating, curtain coating, extrusion, casting, screen printing, or inkjet printing. [91] In addition, drying of the cathode active material slurry may be performed by irradiating heat, E-beam, gamma ray, or UV (G, H, I-line), etc. to evaporate the solvent and drying. The second positive electrode active material slurry may preferably be vacuum dried at room temperature, and by vacuum drying at room temperature as described above, the plasticizer may exist in a solid state instead of a liquid state. [92] Through this drying, the dispersion medium is volatilized and removed, but the remaining components remain without volatilization, forming a positive electrode active material layer. [93] In addition, in the present invention, the positive electrode current collector exhibits electrical conductivity such as a metal plate, and may be used appropriately according to the polarity of the current collector electrode known in the secondary battery field. [94] [95] Meanwhile, the solid electrolyte battery according to another aspect of the present invention includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, wherein the positive electrode is a positive electrode for a solid electrolyte battery according to the present invention. To do. [96] In order for the solid electrolyte battery to be commercialized, it must undergo a high-temperature activation step. In this case, the high-temperature activation step, as described above, can be performed by allowing the battery to be left without charging and discharging for a predetermined time, that is, 10 seconds to 48 hours, within a temperature range of not less than the melting point of the plasticizer and not more than 130 °C. have. [97] Through this activation process, the plasticizer changes to a liquid state, and during the cycle, the liquid plasticizer existing around the second positive electrode active material penetrates into the crack formed in the second positive electrode active material. As a result, it is possible to impart ionic conductivity to the inside of the crack as in the case of a liquid electrolyte battery. As a result, it is possible to prevent deterioration of the life characteristics of the solid electrolyte battery. [98] In addition, in the present invention, the negative electrode may be used without limitation as long as it is a negative active material and can be used as a negative active material for a lithium secondary battery. For example, carbon such as non-graphitized carbon and graphite-based carbon (natural graphite, artificial graphite); Li x Fe 2 O 3 (0≤x≤1), Li x WO 2 (0≤x≤1), Sn x Me 1 - x Me' y O z (Me: Mn, Fe, Pb, Ge; Me' : Al, B, P, Si, elements of groups 1, 2, and 3 of the periodic table, halogens, metal complex oxides such as 0