Specification Title of Invention: Electrolyte membrane for all-solid-state battery and all-solid-state battery comprising same technical field [One] This application claims priority based on Korean Patent Application No. 10-2019-0147024 filed on November 15, 2019. The present invention relates to an electrolyte membrane for an all-solid-state battery having improved thermal stability and shutdown function, and an all-solid-state battery including the electrolyte membrane. [2] background [3] When a lithium ion battery using a liquid electrolyte is deformed by an impact or external environment, the liquid electrolyte may leak to the outside of the battery or the electrolyte may be burned due to a short circuit, which may lead to a risk of overheating or explosion. Therefore, it can be said that the development of a solid electrolyte capable of securing 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 battery safety is increased, electrolyte leakage can be prevented, so battery reliability is improved, and a thin battery can be easily manufactured. In addition, since lithium metal can be used as an anode, energy density can be improved. Accordingly, it is expected to be applied to small secondary batteries and high-capacity secondary batteries for electric vehicles, thereby attracting attention as a next-generation battery. [5] As the solid electrolyte material, a polymer-based solid electrolyte, an oxide-based solid electrolyte, and a sulfide-based solid electrolyte material are generally used. In the case of manufacturing a free standing type electrolyte membrane of a thin film using only such a solid electrolyte material, defects such as tearing or cracking or the electrolyte material falling off may occur during battery manufacture or use of the battery. In particular, when lithium metal is used as the negative electrode active material, there is a problem in that lithium dendrites grow from the surface of the negative electrode, and when the grown lithium dendrites come into contact with the positive electrode, a short circuit of the battery is caused. In an all-solid-state battery, a solid electrolyte membrane acts as an electrical insulator for positive/negative electrodes instead of a separator. In particular, when a polymer material is used as the solid electrolyte, the solid electrolyte membrane may be damaged due to the growth of lithium dendrites. When the electrolyte membrane is damaged in this way, current is collected in the damaged part, and rapid heat is generated, which causes ignition and explosion. In particular, in the case of a large-sized battery, since the amount of heat generated by a short circuit is large, there is a problem that the above-mentioned problem is highly likely to become serious. Accordingly, there is a demand for the development of an electrolyte membrane capable of rapidly performing a shutdown function when a short circuit occurs and a sudden increase in the internal temperature of the battery occurs. [6] DETAILED DESCRIPTION OF THE INVENTION technical challenge [7] An object of the present invention is to provide a solid electrolyte membrane to which a shutdown function is provided and an all-solid-state battery including the same to solve the above technical problem. On the other hand, other objects and advantages of the present invention will be understood by the following description. Further, it will be readily apparent that the objects and advantages of the present invention can be realized by means or methods and combinations thereof recited in the claims. [8] means of solving the problem [9] A first aspect of the present invention relates to a solid electrolyte membrane for an all-solid-state battery, wherein the solid electrolyte membrane has an ionic conductivity of 1x10 -7 S/cm or more in a range of 20°C to 30°C, and includes a polymer material (A); and a solid electrolyte material (B); [10] The polymer material (A) has an ionic conductivity of 9X10 -8 S/cm or less at 20°C to 30°C, [11] The solid electrolyte material (B) includes a polymer electrolyte (C) in which a lithium salt (C1) and a polymer resin (C2) are mixed, [12] The polymer resin (C2) is a block copolymer including a first segment and a second segment different from the first segment, [13] wherein the first segment comprises first repeating units having a polar group; [14] The weight fraction of the first segment in the polymer resin (C2) is 70wt% to 99wt%. [15] A second aspect of the present invention, in the first aspect, the polymer material (A) is included in a ratio of 10 wt% to 70 wt% with respect to 100 wt% of the solid electrolyte membrane. [16] A third aspect of the present invention is the first or second aspect, wherein the solid electrolyte material (B) has an ionic conductivity of 1x10 -7 S/cm or more in a range of 20°C to 30°C. [17] A fourth aspect of the present invention is that according to any one of the first to third aspects, the polymer material (A) comprises at least one selected from the following A1 to A6: [18] A1) Polyolefin-based polymer comprising at least one of ethylene, propylene, butylene and isobutylene as a repeating unit [19] A2) Polystyrene-based polymer [20] A3) Polyacrylate-based polymers such as polymethyl methacrylate (PMMA) [21] A4) Polycarbide-based polymer [22] A5) Polyester-based polymers such as polyethylene terephthalate (PET) [23] A6) Polylactone-based polymers such as polylactone. [24] In a fifth aspect of the present invention, according to the fourth aspect, the polymer material (A) comprises a segment having a polyolefin-based repeating unit, a segment having a polystyrene-based repeating unit, a segment having a polyacrylate-based repeating unit, and a polycarbide A copolymer comprising at least one of a segment having a repeating unit and a segment having a repeating polyester unit and having an ionic conductivity of 9x10 -8 S/cm or less at room temperature (about 20° C. to 30° C.) is further added. will include [25] A fifth aspect of the present invention, in any one of the first to fifth aspects, wherein the solid electrolyte material (B) has an ionic conductivity of 1x10 -7S/cm or more at room temperature, [26] The polymer resin (C2) includes first repeating units having a polar group including at least one polar element selected from oxygen, nitrogen, and sulfur. [27] A seventh aspect of the present invention, in any one of the first to sixth aspects, wherein the first segment is ethylene oxide, carbonate, amide, imide, Aspartic acid, acrylonitrile, peptide, acrylate, urethane, acrylamide, acrylic acid, vinyl acetate, vinyl It contains one or more repeating unit(s) selected from vinylidene chloride and methyl methacrylate. [28] An eighth aspect of the present invention is that according to any one of the first to seventh aspects, the first segment has a molecular weight of 10 kg/mol to 200 kg/mol. [29] In a ninth aspect of the present invention, according to any one of the first to eighth aspects, the polymer resin (C2) is a mixture of a first segment including ethylene oxide repeating units and a second segment including styrene repeating units. It includes a block copolymer comprising a copolymer (PEO-b-PS). [30] A tenth aspect of the present invention, according to the eighth aspect, comprises polystyrene as the polymer material (A) of the solid electrolyte membrane. [31] In an eleventh aspect of the present invention, in any one of the first to tenth aspects, the weight fraction of the second segment in 100 wt% of the total including the polymer material (A) and the polymer resin (C2) is 20 wt% to 50 wt% It is included as a percentage. [32] According to a twelfth aspect of the present invention, in any one of the first to eleventh aspects, according to claim 1, wherein the solid electrolyte membrane phase separation) is induced to form an ion conduction blocking layer including the polymer material (A) in the solid electrolyte membrane, and the temperature change is a rise in temperature. [33] Effects of the Invention [34] In the solid electrolyte membrane according to the present invention, an ion conduction blocking layer is formed in the electrolyte membrane by polymer phase separation under high-temperature conditions such as an increase in the internal temperature of the battery to block the movement of lithium ions. By forming such an 'ion conduction blocking layer' (hereinafter, may be abbreviated as 'blocking layer'), thermal runaway and consequent explosion of the battery are prevented, thereby improving the thermal stability of the battery. [35] Brief description of the drawing [36] The drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to better understand the technical spirit of the present invention together with the above-described contents of the present invention, so the present invention is limited only to the matters described in such drawings is not interpreted as On the other hand, the shape, size, scale, or ratio of elements in the drawings included in this specification may be exaggerated to emphasize a clearer description. [37] 1 is a schematic diagram showing a structure of a solid electrolyte membrane according to the present invention and a mechanism of forming an insulating film according to phase separation. [38] 2 to 3 show AFM phase-mode images of the solid electrolyte membranes of Examples 4-1 and 4-2, respectively. [39] Modes for carrying out the invention [40] Hereinafter, embodiments of the present invention will be described in detail. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of ​​the present invention. Therefore, the configuration described in the embodiment described in this specification is only the most preferred embodiment of the present invention and does not represent all of the technical idea of ​​the present invention, so various equivalents and It should be understood that there may be variations. [41] [42] Throughout this specification, when it is said that a part "includes" or "comprises" a component, it excludes other components unless otherwise stated.It does not mean that other components can be further included. [43] [44] In addition, the terms "about", "substantially", etc. used throughout this specification are used as meanings at or close to the numerical values ​​when manufacturing and material tolerances inherent in the stated meanings are presented to aid the understanding of the present application. It is used to prevent an unconscionable infringer from using the mentioned disclosure unfairly. [45] [46] Throughout this specification, the description of “A and/or B” means “A or B or both”. [47] [48] The specific terminology used in the detailed description that follows is for the sake of convenience and not limitation. The words 'right', 'left', 'top' and 'bottom' indicate directions in the drawings to which reference is made. The words 'inwardly' and 'outwardly' refer respectively to directions towards or away from the geometric center of the designated device, system, and members thereof. 'Anterior', 'rear', 'above', 'below' and related words and phrases indicate positions and orientations in the drawing to which reference is made and should not be limiting. These terms include the words listed above, derivatives thereof, and words of similar meaning. [49] [50] The present invention relates to an electrolyte membrane for an all-solid-state battery and an all-solid-state battery including the same. The solid electrolyte membrane according to the present invention generally operates as an insulating barrier and an ion conductive layer between the positive and negative electrodes in the temperature range at which the battery is driven, and when the temperature inside the battery rapidly rises, such as a short circuit, ions A conduction blocking layer may be formed to control the operation of the battery. In the present invention, the ion conduction blocking layer is formed by melting and phase separation of the low ion conductivity polymer material (A) contained in the solid electrolyte membrane. [51] [52] 1 is a schematic diagram showing a mechanism in which a solid electrolyte membrane and an ion conduction blocking layer are formed according to the present invention. With reference to this, the solid electrolyte membrane of the present invention will be described in detail. [53] [54] The solid electrolyte membrane of the present invention is interposed between the positive electrode and the negative electrode of the all-solid-state battery and functions as an electrical insulation and ion conductive layer between the positive electrode and the negative electrode. In one embodiment of the present invention, in the solid electrolyte membrane, the solid electrolyte membrane has an ionic conductivity of 1x10 -7 S/cm or more in the range of 20° C. to 30° C., and has a thickness of 15 μm to 100 μm. may have a form. [55] [56] In the present invention, the solid electrolyte membrane includes a polymer material (A) and a solid electrolyte material (B) having low ion conductivity. [57] [58] In one embodiment of the present invention, the polymer material (A) has low ionic conductivity. Preferably, it may have an ionic conductivity of 9x10 -8 S/cm or less under room temperature conditions (about 20° C. to 30° C.). In one embodiment of the present invention, examples of the polymer material (A) include A1 to A6 below. For example, the polymer material (A) may include at least one selected from the following A1 to A6. [59] A1) Polyolefin-based polymer comprising at least one of ethylene, propylene, butylene and isobutylene as a repeating unit [60] A2) Polystyrene-based polymer [61] A3) Polyacrylate-based polymers such as polymethyl methacrylate (PMMA) [62] A4) Polycarbide-based polymer [63] A5) Polyester-based polymers such as polyethylene terephthalate (PET) [64] A6) Polylactone-based polymers such as polylactone [65] In addition, in one specific embodiment of the present invention, the polymer material (A) is together with or independently of the specific polymer material exemplified above, a segment having a polyolefin-based repeating unit in a polymer, a segment having a polystyrene-based repeating unit, At least one of a segment having a polyacrylate-based repeating unit, a segment having a polycarbide-based repeating unit, and a segment having a polyester-based repeating unit, and 9x10 -8 S at room temperature (about 20°C to 30°C) It may include a copolymer having an ionic conductivity of /cm or less. In a specific embodiment of the present invention, the polymer material (A) may include a segment having a styrenic repeating unit and/or a polystyrene homopolymer. [66] In a specific embodiment of the present invention, the polymer material (A) has an ionic conductivity of 9x10 -8 S/cm or less at room temperature conditions (about 20° C. to 30° C.) and includes a first segment as described below It may include a block copolymer. In this case, the weight fraction of the first segment in the block copolymer may be included in less than 10 wt%. For example, the polymer material (A) may include a copolymer (PEO-b-PS) of a second segment including styrene polymerized units and a first segment comprising ethylene oxide polymerized units, and the PEO- The weight fraction of the first segment in b-PS is less than 10 wt%. [67] On the other hand, in one embodiment of the present invention, the polymer material (A) may have a molecular weight (Mw) range of 1 kg / mol to 10,000 kg / mol, or 10 kg / mol to 1,000 kg / mol. Within the above range, the molecular weight is preferably 1 kg/mol or more, 5 kg/mol or 10 kg/mol or more in terms of the physical strength of the solid electrolyte membrane. In addition, when the molecular weight is too small, it is difficult to form a layered structure in the electrolyte membrane in phase separation because the length of the polymer chain is short. On the other hand, in terms of molecular mobility and phase separation effect, the molecular weight is preferably 10,000 kg/mol or less. [68] [69] Further, in one embodiment of the present invention, the polymer material (A) preferably has a glass transition temperature (Tg) and/or a melting temperature (Tm) of 150° C. or less. When the melting temperature exceeds the above range, the polymer material (A) does not melt even when the internal temperature of the battery increases, so chain mobility is not implemented and phase separation does not proceed, so it is difficult to achieve a desired effect. [70] In a specific embodiment of the present invention, the polymer material (A) (non-ionic conductivity) is preferably included in a ratio of about 10 wt% to 70 wt% with respect to 100 wt% of the solid electrolyte membrane. [71] [72] Next, the solid electrolyte material (B) is demonstrated. In one embodiment of the present invention, the solid electrolyte material (B) exhibits an ionic conductivity of 1x10 -7S/cm or more, 1x10 -6S/cm or more, or 1x10 -5S/cm or more at room temperature (20°C to 30°C conditions) As such, it may include a polymer-based solid electrolyte material, an oxide-based solid electrolyte material, a sulfide-based solid electrolyte material, or two or more thereof. [73] Preferably, the solid electrolyte material (B) may contain 80 wt% or more, 90 wt% or more, or 99 wt% or more of the polymer-based solid electrolyte material. In one embodiment of the present invention, the solid electrolyte material (B) may contain 100 wt% of the polymer-based solid electrolyte material. As will be described later, in the solid electrolyte membrane, the polymer material (A) and the solid electrolyte material (B) including the polymer-based solid electrolyte material are at least partially melted to have fluidity under high-temperature conditions. Phase separation of the material (A) and the solid electrolyte material (B) proceeds. As a result, as shown in FIG. 1 , an ion conduction blocking layer including the polymer material (A) may be formed in the solid electrolyte membrane. That is, in the present invention, from the viewpoint of facilitating phase separation of the polymer material (A), the solid electrolyte material (B) is preferably made of a polymer-based solid electrolyte material having the above-described weight ratio range. [74] [75] In one embodiment of the present invention, the solid electrolyte material (B) may be included in the range of 20 wt% to 90 wt% relative to 100 wt% of the solid electrolyte membrane. In a specific embodiment of the present invention, the solid electrolyte material may be included in the range of 30wt% to 90wt%, or 30wt% to 85wt%, or 40wt% to 80wt%. When the content of the solid electrolyte material (B) satisfies the above range, after the solid electrolyte membrane is exposed to high temperature, the phase separation of the polymer materials included in the solid electrolyte membrane effectively proceeds. The polymer material (A) as a material may form the ion conduction blocking layer in a direction perpendicular to the thickness direction of the solid electrolyte membrane and in a direction horizontal to the solid electrolyte membrane. [76] [77] The polymer-based solid electrolyte material is a composite in which a lithium salt (C1) and a polymer resin (C2) are mixed, that is, a polymer electrolyte (C) formed by adding a polymer resin (C2) to a solvated lithium salt (C1). In addition, the polymer electrolyte may exhibit ionic conductivity of about 1 x 10 -7 S/cm or more at room temperature conditions (about 20° C. to 30° C.). [78] [79] Also, in one embodiment of the present invention, the polymer resin (C2) may include a copolymer. In a specific embodiment of the present invention, the copolymer may include a random copolymer, a block copolymer, a graft copolymer, or both. The block copolymer is obtained by repeating polymerization of any one type of monomers in the polymer to form a segment (or block) in which certain repeating units are repeated, and polymerization of other types of monomers to form a segment (or block). . The graft copolymer is obtained in such a way that a main chain in which one monomer is polymerized is graft-linked to a side chain in which another monomer is polymerized. [80] [81] In the present invention, the polymer (C2) includes a block copolymer including a first segment and a second segment different from the first segment. The first segment comprises a polar element such as oxygen, nitrogen, and sulfur.and the first repeating units having a polar group. These elements form a polymer-ion complex by coordinating with the dissociated ions, allowing lithium ions to be transported. In one embodiment of the present invention, the block copolymer may have a structure in which one end of the first segment made of first repeating units is connected to one end of the second segment made of second repeating units. [82] [83] In one embodiment of the present invention, the first segment may include ethylene oxide as a repeating unit. In addition, the first segment, together with or independently of this, polypropylene oxide [poly (propylene oxide); repeating unit of PPO], polyacrylonitrile [poly(acrylonitrile); repeating unit of PAN], polyvinyl chloride [poly(vinyl chloride); a repeating unit of PVC], poly(vinylidene fluoride); a repeating unit of PVDF], poly(methyl methacrylate); repeating unit of PMMA, repeating unit of polysiloxane, polypropylene carbonate; It may include one or two or more repeating units selected from repeating units of [PPC] and repeating units of polyphosphazene [polyphosphazene]. However, the present invention is not limited thereto. More specifically in the present invention, the first segment is ethylene oxide, carbonate, amide, imide, aspartic acid, acrylonitrile, One selected from peptide, acrylate, urethane, acrylamide, acrylic acid, vinyl acetate, vinylidene chloride and methyl methacrylate It may include more than one repeating unit(s). In a specific embodiment of the present invention, the first segment in the block copolymer may have a molecular weight (Mw) of 10 kg/mol to 200 kg/mol. When it is lower than the above range, the fluidity increases, but phase separation becomes difficult, and when it is higher than the above range, the fluidity of the chain is lowered, making it difficult to obtain the expected effect. [84] [85] In the present invention, the second segment may include repeating units constituting the above-described polymer material (A). For example, the second segment may include olefinic repeat units such as ethylene, isobutylene, butylene, propylene, and the like; Polystyrene-based polymer repeating units such as styrene, acrylic repeating units such as alkyl (meth)acrylate, polycarbide-based polymer repeating units and ester-based repeating units such as ethylene terephthalate (PET), polylactone-based repeating units, carbide-based repeating units and the like can be given. In one embodiment of the present invention, the second segment may include one or more of the aforementioned repeating units. In a specific embodiment of the present invention, the second segment in the block copolymer may have a molecular weight (Mw) of 10 kg/mol to 200 kg/mol. If the molecular weight is less than the range, the fluidity of the polymer increases, but phase separation becomes difficult. [86] [87] In a preferred embodiment of the present invention, the polymer resin (C2) comprises a copolymer (PEO-b-PS) of a first segment containing ethylene oxide repeating units and a second segment containing styrene repeating units. block copolymers. In one embodiment of the present invention, polystyrene may be included as the polymer material (A) at this time. [88] [89] On the other hand, in a specific embodiment of the present invention, when the polymer resin (C2) has the above characteristics, the weight fraction of the second segment in the polymer resin (C2) is included in the range of 1 wt% to 30 wt%. can In addition, the first segment may be included in the range of 70wt% to 99wt%. In one embodiment of the present invention, the content (wt%) of each segment in the copolymer can be measured through a method of TGA analysis (thermogravimetric analysis) or GC-Mass (gas chromatography mass spectrometry). [90] [91] In addition, according to a specific embodiment of the present invention, the polymer resin (C2) may have a molecular weight (Mw) range of 1kg / mol to 10,000kg / mol. In view of the physical strength of the solid electrolyte membrane, the molecular weight is preferably 1 kg/mol or more. On the other hand, in terms of molecular mobility and phase separation effect, the molecular weight is preferably 10,000 kg/mol or less. In the present invention, unless otherwise specified, the molecular weight means a weight average molecular weight (Mw). In addition, the molecular weight (Mw) may be measured using, for example, gel permeation chromatography (GPC, PL GPC220, Agilent Technologies). [92] [93] On the other hand, in a specific embodiment of the present invention, in terms of fluidity during phase separation, the weight fraction of the portion occupied by the second segment in 100 wt% of the total polymer component including the polymer material (A) and the polymer resin (C2) is 20 wt% to It is preferably included in a proportion of 50 wt%. Here, the second segment means including the second segment included in the polymeric resin (C2) and the second segment included in the polymeric material (A). [94] For example, when polystyrene (PS) is included as the polymer material (A) in the solid electrolyte membrane, the polystyrene is a polymer composed of the second segment. Accordingly, when calculating the weight fraction of the second segment from 100 wt% of the total polymer component including the polymer material (A) and the polymer resin (C2), the weight of polystyrene used as the polymer material (A) is included. [95] In a specific embodiment of the present invention, when PS is used as the polymer material (A) and PEO-b-PS is used as the polymer resin (C2), PEO to the total weight of PS and PEO-b-PS 100wt% The ratio (weight fraction) of the sum of the PS segment weight and the PS weight in -b-PS is 20 wt% to 50 wt%. [96] In addition, as described above, when a PEO-b-PS block copolymer is used as the polymer material (A), the PS segment included therein is regarded as the second segment. [97] In a specific embodiment of the present invention, when PEO-b-PS (A) is used as the polymer material (A) and PEO-b-PS (B) is used as the polymer resin (C2), the PEO-b -The ratio of the sum of the PS segment weight in PEO-b-PS(A) and PS segment in PEO-b-PS(B) to 100wt% of the total weight of PS(A) and PEO-b-PS(B) (weight fraction) is 20 wt% to 50 wt%. [98] This can be more clearly understood through the Examples and Comparative Examples to be described later. [99] For example, Example 1 uses a polystyrene-polyethylene oxide block copolymer (Polystyrene-co-Polyethylene oxide, PS-b-PEO) as the polymer resin (C2) and polystyrene (PS) as the polymer material (A). used, and the PS-b-PEO is a block copolymer in which a polystyrene (PS) segment and a polyethylene oxide (PEO) segment are bonded to each other. Here, the weight fraction of the PS segment in the entire polymer material PS and the polymer resin PS-b-PEO was calculated to be 38.95 wt%. [100] On the other hand, Example 3 is a polystyrene-co-polyethylene oxide block copolymer (Polystyrene-co-Polyethylene oxide, PS-b-PEO) having different properties (ionic conductivity, etc.) as a polymer material (A) and a polymer resin (C2), respectively. is to use In this case, the weight fraction of the PS segment in the entire polymer material (A) and polymer resin (C2) was calculated to be 41.12375 wt%. [101] In the electrolyte of the present invention, the above-described lithium salt is an ionizable lithium salt and may be expressed as Li +X -. The anion of the lithium salt is not particularly limited, but F -, Cl -, Br -, I -, NO 3 -, N(CN) 2 -, BF 4 -, ClO 4 -, PF 6 -, (CF 3) 2PF 4 -, (CF 3) 3PF 3 -, (CF 3) 4PF 2 -, (CF 3) 5PF -, (CF 3) 6P -, CF 3SO 3 -, CF 3CF 2SO 3 -, (CF 3SO 2) 2N -, (FSO 2) 2N - , CF 3CF 2(CF 3) 2CO -, (CF 3SO 2) 2CH -, (SF 5) 3C -, (CF 3SO 2) 3C -, CF 3(CF 2) 7SO 3 -, CF 3CO 2 -, CH 3CO 2 -, SCN -, (CF 3CF 2SO 2) 2N -, and the like can be exemplified. [102] [103] In the present invention, the solid electrolyte membrane is about 100 μm or less, preferably about 15 μm to 90 μm. The thickness may have an appropriate thickness in consideration of ionic conductivity, physical strength, energy density of an applied battery, and the like within the above-described range. For example, in terms of ionic conductivity or energy density, the thickness may be 80 μm or less, or 70 μm or less, or 60 μm or less or 50 μm or less. Meanwhile, in terms of physical strength, the thickness may be 20 μm or more, or 30 μm or more, or 40 μm or more. [104] [105] As described above, in the solid electrolyte membrane according to the present invention, the solid electrolyte membrane has a temperatureAs the change, in particular, the temperature rises, phase separation of the solid electrolyte material (B) and the polymer material (A) is induced to form an ion conduction blocking layer including the polymer material (A) in the solid electrolyte membrane. That is, the polymer material (A) having low ionic conductivity contained in the solid electrolyte membrane is melted under a specific temperature condition to form an ion conduction blocking layer in the solid electrolyte membrane according to the phase separation behavior (see FIG. 1 ). The formation of the ion conduction blocking layer blocks the movement of ions between the positive electrode and the negative electrode, so that the battery operation can be stopped. That is, since the operation of the battery is stopped when the temperature inside the battery is rapidly increased, it is possible to prevent further temperature increase or explosion of the battery due to the increase in temperature. [106] [107] 1 schematically shows a mechanism in which a barrier layer is formed according to the structure and phase separation of a solid electrolyte membrane according to an embodiment of the present invention. The green part in FIG. 1 shows the solid electrolyte material (B), and the yellow part shows the polymer material (A). The black arrow indicates the movement of lithium ions. Under a typical battery operating temperature, the polymer material (A) is randomly distributed in the solid electrolyte membrane, so that the transfer of lithium ions between the positive electrode and the negative electrode is not hindered. Accordingly, the solid electrolyte membrane exhibits ionic conductivity resulting from the solid electrolyte material (B). On the other hand, when the internal temperature of the battery rises, the fluidity of the polymer material (A) and the solid electrolyte material (B) increases. In particular, when the solid electrolyte material (B) mainly contains a polymer-based solid electrolyte material, the solid electrolyte membrane is melted to phase-separate the polymer-based solid electrolyte material and the polymer material. As a result, the polymer material (A) can form a layered barrier layer in the solid electrolyte membrane, and ion conduction is blocked by the formation of the barrier layer. [108] [109] The blocking layer refers to a shape in which the polymer material (A) is concentrated at a high concentration in a local area according to phase separation to suppress ion conduction, and is not limited to a specific shape. For example, the blocking layer may be formed in a layered structure on either surface of the solid electrolyte membrane or in the solid electrolyte membrane. Such a layered structure may be formed entirely at a predetermined depth or surface of the solid electrolyte membrane, or small droplets of molten polymers may be gathered to form a layer. 1 schematically shows various embodiments of a blocking layer. When the barrier layer is developed as the temperature of the battery rises, ion transfer is consequently blocked and the battery operation is stopped, so that the thermal stability of the battery is improved. [110] [111] The solid electrolyte membrane according to the present invention may be manufactured, for example, by the following method, but is not particularly limited thereto. Specifically, the following description has been made using the polymer electrolyte (C) as the solid electrolyte material (B) as an example. [112] First, the polymer electrolyte (C) and the polymer material (A) are put into an appropriate solvent to prepare a polymer solution for manufacturing a solid electrolyte membrane. In one embodiment of the present invention, the lithium salt, the polymer resin (C2) and the polymer material (A) may be added to the solvent at the same time, or may be sequentially added at each time. [113] The concentration of the polymer solution may be appropriately adjusted to a degree necessary for uniform coating of the solid electrolyte membrane, and is not limited to a specific range. The solvent may be used without limitation as long as it can be removed through a subsequent drying process without changing the properties of the components to be added, and an appropriate one may be selected according to the input material used. For example, when using an alkylene oxide system such as polyethylene oxide (PEO) as the polymer resin (C2), acetonitrile may be used as the solvent. Next, the polymer solution is applied to a release sheet such as a terephthalate film and molded into a film having a predetermined thickness. For the application and molding, a known coating method such as a doctor blade may be used. Thereafter, the solvent is removed by drying to obtain a solid electrolyte membrane. On the other hand, in one specific embodiment of the present invention, the solid electrolyte membrane may further include a binder resin in the range of 10 wt% or less, if necessary. [114] [115] In addition, the present invention provides an all-solid-state battery including the above-described solid electrolyte membrane. The all-solid-state battery includes a positive electrode, a negative electrode, and a solid electrolyte membrane. In one embodiment of the present invention, the negative electrode may include lithium metal as the negative electrode active material. [116] [117] In the present invention, the positive electrode and the negative electrode may include a current collector and an electrode active material layer formed on a surface of the current collector, and the active material layer may include a plurality of electrode active material particles and a solid electrolyte material. In one embodiment of the present invention, the current collector itself may be applied as the negative electrode without forming an active material layer on the surface of the current collector when the negative electrode is manufactured. In addition, each of the electrodes may further include at least one of a conductive material and a binder resin, if necessary. In addition, the electrode may further include various additives for the purpose of supplementing or improving the physicochemical properties of the electrode. [118] [119] In the present invention, the negative electrode active material may include lithium metal as the negative electrode active material of the lithium ion secondary battery, and any material that can be used as the negative electrode active material may be used. For example, the negative active material may include carbon such as non-graphitizable carbon and graphitic carbon; Li xFe 2O 3 (0≤x≤1), Li xWO 2 (0≤x≤1), Sn xMe 1-xMe' yO z(Me: Mn, Fe, Pb, Ge; Me': Al, B, P , Si, a group 1, 2, or 3 element of the periodic table, halogen; 0