All-solid-state battery and method for manufacturing all-solid-state battery

Abstract

The present invention relates to an all-solid-state battery and, more specifically, to an all-solid-state battery comprising: a battery cell including a cathode layer, an anode layer, and a solid electrolyte layer arranged between the cathode layer and the anode layer; at least one elastic pad arranged on an upper part and / or a lower part of the battery cell; and a taping member attached to the at least one elastic pad, wherein, on a plane formed in a first direction (D1) and a second direction (D2), the area of the cathode layer is smaller than the area of the anode layer, the elastic pad has, with respect to a third direction (D3), a non-taping region formed on a region corresponding to the area of the cathode layer, a taping region is formed at an outer portion of the non-taping region, and the taping member can be attached to the taping region.

Description

All-solid-state battery and method for manufacturing an all-solid-state battery

[0001] The present invention relates to an all-solid-state battery and a method for manufacturing an all-solid-state battery, and more specifically, to an all-solid-state battery with improved uniform pressurization and a method for manufacturing an all-solid-state battery.

[0002] In response to recent industrial demands, the development of batteries with high energy density and safety is actively underway. Recently, all-solid-state batteries, which replace liquid electrolytes with solid electrolytes, have been proposed. An all-solid-state battery is a battery formed by stacking a positive electrode, a solid electrolyte, and a negative electrode, and then densifying them under pressure; it utilizes a solid electrolyte instead of the liquid electrolyte found in conventional rechargeable batteries. By not using flammable organic dispersion media, all-solid-state batteries can significantly reduce the likelihood of fire or explosion in the event of a short circuit. Consequently, these all-solid-state batteries possess high safety.

[0003] All-solid-state batteries can be fabricated in the form of stacked cells by stacking multiple monocells or multiple bicells. For stacked all-solid-state batteries, it is important to apply uniform pressure to each cell during charging and discharging. If the cells are not uniformly pressurized, it can have an adverse effect on the performance of the all-solid-state battery. If the pressure applied to each cell is not uniform, interfacial contact becomes uneven, which can lead to poor physical and electrical contact between the anode layer, cathode layer, and solid electrolyte layer, hinder the movement of Li, and cause forced deformation. This can degrade the performance of the all-solid-state battery.

[0004] The problem that the present invention aims to solve is to provide an all-solid-state battery with improved uniform pressurization.

[0005] Another problem that the present invention aims to solve is to provide a method for manufacturing an all-solid-state battery with improved uniform pressurization.

[0006] A solid-state battery according to an embodiment of the present invention comprises: a battery cell including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer; at least one elastic pad disposed on at least one of the upper and lower portions of the battery cell; and a taping member attached to the at least one elastic pad. On a plane formed by a first direction (D1) and a second direction (D2), the area of ​​the positive electrode layer is smaller than the area of ​​the negative electrode layer, and based on a third direction (D3), a non-taping area is formed on the elastic pad in an area corresponding to the area of ​​the positive electrode layer, and a taping area is formed on the outer portion of the non-taping area, and the taping member may be attached to the taping area.

[0007] A method for manufacturing an all-solid-state battery according to another embodiment of the present invention comprises: forming a battery cell comprising a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer; disposing of at least one elastic pad on at least one of the upper and lower portions of the battery cell; dividing a taping area and a non-taping area on the elastic pad; and attaching a taping member to the taping area; wherein, on a plane formed by a first direction (D1) and a second direction (D2), the area of ​​the positive electrode layer is formed to be smaller than the area of ​​the negative electrode layer, and based on a third direction (D3), on the elastic pad, the non-taping area is formed in an area corresponding to the area of ​​the positive electrode layer, and the taping area may be formed on the outer portion of the non-taping area.

[0008] The all-solid-state battery and the method for manufacturing the all-solid-state battery according to the present invention can suppress the interference of uniform pressure due to the thickness of the tape during charging and discharging of the stack cell by attaching a tape to an outer region that does not overlap with the positive electrode layer on the stack cell.

[0009] In addition, by forming a taping groove on an elastic sheet laminated on a stack cell and attaching a tape to the taping groove, it is possible to suppress the interference of uniform pressure due to the thickness of the tape during the charging and discharging of the stack cell.

[0010] This increases the interfacial contact force between the electrode active material and the solid electrolyte and ensures uniform pressure between the interfaces, thereby improving the performance of the all-solid-state battery.

[0011] FIG. 1 is a side cross-sectional view illustrating the monocell shape of an all-solid-state battery according to an embodiment of the present invention.

[0012] FIG. 2 is a plan view illustrating the monocell form of an all-solid-state battery according to an embodiment of the present invention.

[0013] FIG. 3 is a perspective view illustrating the bicell form of an all-solid-state battery according to an embodiment of the present invention.

[0014] FIG. 4 is a partial cross-sectional view illustrating the AA' portion disclosed in FIG. 3.

[0015] FIG. 5a is a diagram illustrating a stacked state in the form of stack cells of an all-solid-state battery according to an embodiment of the present invention.

[0016] FIG. 5b is a drawing showing the state of the stack cell illustrated in FIG. 5a being taped.

[0017] FIG. 5c is a drawing showing the lead tabs of the stack cell illustrated in FIG. 5b welded.

[0018] FIG. 6 is a plan view illustrating a state in which a taping member is attached to a taping area in an all-solid-state battery according to an embodiment of the present invention.

[0019] FIG. 7 is a partial cross-sectional view illustrating the BB' portion disclosed in FIG. 6.

[0020] FIG. 8 is a plan view illustrating a state in which a taping member is attached to a taping groove of a taping region in an all-solid-state battery according to an embodiment of the present invention.

[0021] FIG. 9 is a partial cross-sectional view illustrating the CC' portion disclosed in FIG. 8.

[0022] FIG. 10 is a drawing illustrating a method for manufacturing an all-solid-state battery according to one embodiment of the present invention.

[0023] FIG. 11 is a drawing illustrating a method for manufacturing an all-solid-state battery according to another embodiment of the present invention.

[0024] FIGS. 12a to 12e are drawings illustrating the state of carrying out a taping process according to the manufacturing method of an all-solid-state battery disclosed in FIG. 10.

[0025] In order to fully understand the structure and effects of the present invention, preferred embodiments of the present invention are described with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and various modifications can be made. The description of these embodiments is provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention.

[0026] In this specification, when a component is described as being on another component, it means that it may be formed directly on the other component or that a third component may be interposed between them. Additionally, in the drawings, the thicknesses of the components are exaggerated for the effective description of the technical content. Throughout the specification, parts indicated by the same reference numeral represent the same components.

[0027] The embodiments described herein will be described with reference to cross-sectional and / or plan views, which are exemplary illustrations of the invention. In the drawings, the thicknesses of films and regions are exaggerated for effective description of the technical content. Accordingly, the regions illustrated in the drawings are schematic in nature, and the shapes of the regions illustrated in the drawings are intended to illustrate specific forms of regions of the device and are not intended to limit the scope of the invention. Although terms such as first, second, third, etc., have been used to describe various components in the various embodiments of this specification, these components should not be limited by such terms. These terms are used merely to distinguish one component from another. The embodiments described and illustrated herein also include their complementary embodiments.

[0028] The terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, 'comprises' and / or 'comprising' do not exclude the presence or addition of one or more other components to the mentioned components.

[0029]

[0030] FIG. 1 is a side cross-sectional view illustrating the monocell shape of an all-solid-state battery according to an embodiment of the present invention. FIG. 2 is a plan view illustrating the monocell shape of an all-solid-state battery according to an embodiment of the present invention.

[0031] Referring to FIG. 1, an all-solid-state battery (ASB) according to an embodiment of the present invention may include a positive electrode layer (10), a negative electrode layer (20) facing the positive electrode layer (10), and a solid electrolyte layer (30) disposed between the positive electrode layer (10) and the negative electrode layer (20). However, not limited thereto, the all-solid-state battery (ASB) may further include an additional functional layer, such as an adhesion-enhancing layer, disposed between the positive electrode layer (10) and the solid electrolyte layer (30) or between the negative electrode layer (20) and the solid electrolyte layer (30).

[0032] The anode layer (10) of one embodiment may include an anode current collector (11) and an anode active material layer (12) disposed on the anode current collector (11). Although not illustrated, the anode active material layer (12) may include an anode active material, a solid electrolyte, a conductive material, and a binder.

[0033] The positive current collector (11) can provide a reference surface on which the positive active material layer (12) is placed. The positive current collector (11) may include, for example, a plate or foil comprising indium (In), copper (Cu), magnesium (Mg), stainless steel, titanium (Ti), iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), aluminum (Al), germanium (Ge), lithium (Li), or an alloy thereof.

[0034] Meanwhile, unlike as illustrated in FIG. 1, the positive current collector (11) may be omitted in one embodiment of the present invention. Although not illustrated, a carbon layer with a thickness of 0.1 μm to 4 μm may be further disposed between the positive current collector (11) and the positive active material layer (12) to increase the bonding strength between the positive current collector (11) and the positive active material layer (12).

[0035] The positive electrode active material may include a material capable of reversibly absorbing and desorbing lithium ions. The positive electrode active material may include a plurality of particles. The positive electrode active material may include, for example, lithium transition metal oxides such as lithium cobalt oxide (LCO), lithium nickel oxide, lithium nickel cobalt oxide, lithium nickel cobalt aluminum oxide (NCA), lithium nickel cobalt manganese oxide (NCM), lithium manganate, and lithium iron phosphate, nickel sulfide, copper sulfide, lithium sulfide, iron oxide, or vanadium oxide, but is not necessarily limited to these. Each positive electrode active material may be a single material or a mixture of two or more materials.

[0036] Lithium transition metal oxides are, for example, Li a A 1-b B b D2(0.90≤a≤1, 0≤b≤0.5), Li a E 1-b B b O 2-c D c (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05), LiE 2-b B b O 4-c D c (0≤b≤0.5, 0≤c≤0.05), Li a Ni 1-b-c Co b B c D α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α<2), Li a Ni 1-b-c Co b B c O 2-α F α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α<2), Li a Ni 1-b-c Mn bB c D α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α≤2), Li a Nor 1-b-c Mn b B c O 2-α F α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α<2), Li a Nor b E c G d O2(0.90≤a≤1, 0≤b≤0.9, 0≤c≤0.5, 0.001≤d≤0.1), Li a Nor b Co c Mn d G e O2(0.90≤a≤1, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0.001≤e≤0.1), Li a NiG b O2(0.9≤a≤1, 0.001≤b≤0.1), Li a CoG b O2(0.90≤a≤1, 0.001≤b≤0.1), Li a MnG b O2(0.90≤a≤1, 0.001≤b≤0.1), Li a Mn2G b O4(0.90≤a≤1, 0.001≤b≤0.1), QO2, QS2, LiQS2, V2O5, LiV2O5, LiIO2, LiNiVO4, Li 3-f J2(PO4)3(0≤f≤2), Li 3-fIt is a compound represented by any one of Fe2(PO4)3 (0≤f≤2) or LiFePO4. In such compounds, the uppercase “A” is Ni, Co, Mn, or a combination thereof; the uppercase “B” is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof; the uppercase “D” is O, F, S, P, or a combination thereof; the uppercase “E” is Co, Mn, or a combination thereof; the uppercase “F” is F, S, P, or a combination thereof; the uppercase “G” is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; the uppercase “Q” is Ti, Mo, Mn, or a combination thereof; the uppercase “I” is Cr, V, Fe, Sc, Y, or a combination thereof; and the uppercase “J” is V, Cr, Mn, Co, Ni, Cu, or a combination thereof.

[0037] The positive electrode active material may include, for example, a lithium salt of a transition metal oxide having a layered rock salt type structure among the lithium transition metal oxides described above. The "layered rock salt type structure" is, for example, a cubic rock salt type structure. <111> It is a structure in which oxygen and metal atomic layers are alternately and regularly arranged in a specific direction, thereby forming a two-dimensional plane for each atomic layer. The "cubic rock salt type structure" represents a sodium chloride (NaCl) type structure, which is a type of crystal structure; specifically, it exhibits a structure in which face-centered cubic lattices (fcc) formed by cations and anions, respectively, are offset from each other by half the ridge of the unit lattice. Lithium transition metal oxides having such a layered rock salt type structure are, for example, LiNi x Co y Al z O2(NCA) or LiNi x Co y Mn zO2(NCM) (0 <x<1,0<y<1, 0<z<1, x+y+z=1) 등의 삼원계 리튬전이금속산화물일 수 있다. 양극 활물질이 층상암염형 구조를 갖는 삼원계 리튬전이금속산화물을 포함하는 경우, 전고체 전지(ASB)의 에너지 밀도가 커지고 열안정성이 향상될 수 있다.

[0038] The aforementioned compound contained in the positive electrode active material may be covered by a coating layer (not shown). The positive electrode active material may also be a mixture of the aforementioned compound and the compound to which the coating layer is added. Meanwhile, the coating layer added to the surface of the positive electrode active material may include, for example, oxides, hydroxides, oxyhydroxides, oxycarbonates, or hydroxycarbonates of the following coating elements. The compounds forming this coating layer are amorphous or crystalline. The coating elements included in the coating layer may include Mg, Al, Co, K, Na, Ca, Si, Ti, V, Sn, Ge, Ga, B, As, Zr, or mixtures thereof. The coating layer may include, for example, Li2O-ZrO2 (LZO). The method for forming the coating layer is selected within a range that does not adversely affect the physical properties of the positive electrode active material. The method for forming the coating layer is, for example, spray coating or immersion.

[0039] When the cathode active material is a ternary lithium transition metal oxide, such as NCA or NCM, containing nickel (Ni), it is possible to increase the capacity density of the all-solid-state battery (ASB) and reduce metal leaching from the cathode active material during the charged state. Consequently, the cycle characteristics of the all-solid-state battery (ASB) during the charged state are improved. Meanwhile, "cycle characteristics" refers to the degree of degradation of the all-solid-state battery (ASB) due to charging and discharging; an all-solid-state battery (ASB) with high cycle characteristics undergoes less degradation due to charging and discharging, whereas an all-solid-state battery (ASB) with low cycle characteristics may undergo greater degradation due to charging and discharging.

[0040] The positive active material may have a particle shape such as a sphere or an ellipsoid. The particle size and content of the positive active material are not particularly limited. In one embodiment, the positive active material is in the form of a polycrystalline structure and may include secondary particles formed by the aggregation of at least two primary particles. In other words, a single first particle may include a plurality of primary particles (NNP) aggregated together. The first particle may have a spherical or elliptical shape.

[0041] A solid electrolyte may be dispersed between the cathode active materials. The solid electrolyte dispersed between the cathode active materials may have a particulate form. The solid electrolyte dispersed between the cathode active materials may include a sulfide-based solid electrolyte with excellent lithium ion conductivity characteristics. Sulfide-based solid electrolytes are, for example, Li2S-P2S5, Li2S-P2S5-LiX (where X is a halogen element), Li2S-P2S5-Li2O, Li2S-P2S5-Li2O-LiI, Li2S-SiS2, Li2S-SiS2-LiI, Li2S-SiS2-LiBr, Li2S-SiS2-LiCl, Li2S-SiS2-B2S3-LiI, Li2S-SiS2-P2S5-LiI, Li2S-B2S3, and Li2S-P2S5-Z m S n (m, n are positive numbers, uppercase “Z” is one of Ge, Zn, or Ga), Li2S-GeS2, Li2S-SiS2-Li3PO4, Li2S-SiS2-Li p MO q (p, q are positive numbers, uppercase “M” is one of P, Si, Ge, B, Al, Ga, In), Li 7-x PS 6-x Cl x (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I xIt may include at least one selected from (0≤x≤2).

[0042] Sulfide-based solid electrolytes are, for example, Li 7-x PS 6-x Cl x (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I x It may be an argyrodite-type compound comprising one or more selected from (0≤x≤2). In particular, the sulfide-based solid electrolyte may be an argyrodite-type compound comprising one or more selected from Li6PS5Cl, Li6PS5Br, and Li6PS5I. The density of the argyrodite-type solid electrolyte may be 1.5 g / cc to 2.0 g / cc. By having a density of 1.5 g / cc or higher for the argyrodite-type solid electrolyte, the internal resistance of the all-solid-state battery is reduced, and defects such as penetration and short circuit of the solid electrolyte film due to lithium dendrite formation can be prevented. The elastic modulus of the solid electrolyte may be, for example, 15 GPa to 35 GPa.

[0043] The solid electrolyte in the positive active material layer (12) may have a smaller average particle size (D50) compared to the solid electrolyte in the solid electrolyte layer (30) described later. For example, the average particle size (D50) of the solid electrolyte included in the positive active material layer (12) may be 90% or less, 80% or less, 70% or less, 60% or less, 50% or less, 40% or less, 30% or less, or 20% or less of the average particle size (D50) of the solid electrolyte included in the solid electrolyte layer (30). Meanwhile, the average particle size (D50) may be a median diameter measured using a laser particle size distribution meter.

[0044] The positive active material layer (12) may include a conductive material. The conductive material may have conductivity without causing chemical changes in the all-solid-state battery (ASB), thereby increasing the conductivity of the positive active material and the solid electrolyte. The conductive material may include a carbon-based material. The conductive material may include, for example, one or more selected from graphite, carbon black, acetylene black, carbon nanofibers, and carbon nanotubes.

[0045] The positive active material layer (12) may further include a binder. The binder may bind the positive active material, solid electrolyte, and conductive material within the positive active material layer (12) together. The binder may include a material to improve the bonding strength between the positive active material layer (12) and the positive current collector (11). The binder may include, for example, polyvinylidene fluoride, styrene butadiene rubber (SBR), polytetrafluoroethylene, polyvinylidene fluoride, vinylidene fluoride / hexafluoropropylene copolymer, polyacrylonitrile, and polymethyl methacrylate.

[0046] Based on 100 parts by weight of the total positive active material, solid electrolyte, conductive material, and binder, the positive active material layer (12) may contain 85 parts by weight or more and 92 parts by weight or less of the positive active material. Based on 100 parts by weight of the total positive active material, solid electrolyte, conductive material, and binder, the positive active material layer (12) may contain 0.5 parts by weight or more and 1.5 parts by weight or less of the binder.

[0047] Based on 100 parts by weight of solid electrolyte within the positive active material layer (12), the positive active material layer (12) may contain 1 part by weight or more and 50 parts by weight or less of conductive material. If the conductive material is included in the positive active material layer (12) in an amount less than 1 part by weight based on 100 parts by weight of solid electrolyte within the positive active material layer (12), the proportion of the conductive material decreases, and the electrical conductivity of the positive active material layer (12) may decrease. If the conductive material is included in the positive active material layer (12) in an amount exceeding 50 parts by weight based on 100 parts by weight of solid electrolyte within the positive active material layer (12), the proportion of the conductive material is excessively high, and a coating layer covering the surface of the solid electrolyte may not be properly formed.

[0048] The positive active material layer (12) may further include additives such as fillers, coating agents, dispersants, and ion conductivity aids in addition to the positive active material, solid electrolyte, conductive material, and binder described above.

[0049] The negative electrode layer (20) may include a negative electrode current collector (21) and a negative electrode coating layer (22) on the negative electrode current collector (21). The negative electrode current collector (21) may provide a reference surface on which the negative electrode coating layer (22) is placed. The negative electrode current collector (21) may include, for example, a material that does not react with lithium, that is, does not form any alloys or compounds with lithium. For example, the negative electrode current collector (21) may include at least one metal selected from the group consisting of copper (Cu), stainless steel, titanium (Ti), iron (Fe), cobalt (Co), and nickel (Ni). The thickness of the negative electrode current collector (21) may be 1 μm to 20 μm, more specifically 5 μm to 15 μm, and more specifically 7 μm to 10 μm.

[0050] The negative current collector (21) may be composed of one of the metals described above, or may include an alloy of two or more metals or a coating material. The negative current collector (21) may, for example, have a plate-like or foil-like shape. Meanwhile, in one embodiment, the negative current collector (21) may be omitted.

[0051] The negative electrode coating layer (22) can allow lithium metal to grow between the negative electrode current collector (21) and the all-solid-state battery (ASB) during charging. The negative electrode coating layer (22) can serve as a protective layer for the lithium metal and simultaneously suppress the precipitation and growth of lithium dendrites.

[0052] The cathode coating layer (22) may include metal and carbon. For example, the cathode coating layer (22) may include at least one metal selected from the group consisting of gold (Au), platinum (Pt), palladium (Pd), silicon (Si), silver (Ag), aluminum (Al), bismuth (Bi), tin (Sn), and zinc (Zn). The cathode coating layer (22) may include at least one carbon selected from the group consisting of carbon black, acetylene black, furnace black, ketjen black, and graphene. In one embodiment, the cathode coating layer (22) may include a mixture of carbon black and silver (Ag).

[0053] The cathode coating layer (22) may further include other additives in addition to metal and carbon. The cathode coating layer (22) may further include at least one additive selected from the group consisting of, for example, binders, fillers, coating agents, dispersants, and ion-conducting aids.

[0054] The negative electrode coating layer (22) may have a smaller thickness compared to the positive electrode active material layer (12). The thickness of the negative electrode coating layer (22) may be, for example, 50% or less, 40% or less, 30% or less, 20% or less, 10% or less, or 5% or less of the thickness of the positive electrode active material layer (12). The thickness of the negative electrode coating layer (22) may be, for example, 1 μm to 20 μm, 2 μm to 10 μm, or 3 μm to 7 μm. If the thickness of the negative electrode coating layer (22) is excessively thin, lithium dendrites formed between the negative electrode coating layer (22) and the negative electrode current collector (21) may cause the negative electrode coating layer (22) to collapse, thereby degrading the cycle characteristics of the all-solid-state battery (ASB). If the thickness of the negative electrode coating layer (22) increases excessively, the energy density of the all-solid-state battery (ASB) decreases and the internal resistance of the all-solid-state battery (ASB) due to the negative electrode coating layer (22) increases, which may degrade the cycle characteristics of the all-solid-state battery (ASB).

[0055] Meanwhile, although not shown, a carbon layer may be further included to improve adhesion between the cathode coating layer (22) and the solid electrolyte layer (30).

[0056] A solid electrolyte layer (30) may be provided between the positive electrode layer (10) and the negative electrode layer (20). The solid electrolyte layer (30) may include a sulfide-based solid electrolyte with excellent lithium ion conductivity characteristics. The solid electrolyte in the solid electrolyte layer (30) may be the same as or different from any one of the materials included in the solid electrolyte in the aforementioned positive electrode active material layer (12).

[0057] The solid electrolyte layer (30) may include a first solid electrolyte layer (31) and a second solid electrolyte layer (32). The first solid electrolyte layer (31) may be adjacent to the anode layer (10), and the second solid electrolyte layer (32) may be adjacent to the cathode layer (20).

[0058] The second solid electrolyte layer (32) can be in direct contact with the negative electrode coating layer (22). By doing so, the second solid electrolyte layer (32) can suppress lithium dendrites formed between the negative electrode coating layer (22) and the negative electrode current collector (21). The second solid electrolyte layer (32) can effectively suppress negative side reactions. By doing so, the cell performance of the all-solid-state battery (ASB) according to the present invention can be improved.

[0059] The solid electrolyte in the solid electrolyte layer (30) can have particle shapes such as spheres or ellipsoids.

[0060] The solid electrolyte in the solid electrolyte layer (30) may include a sulfide-based solid electrolyte. The solid electrolyte in the solid electrolyte layer (30) may be amorphous, crystalline, or a mixture thereof. Additionally, the solid electrolyte may include sulfur (S), phosphorus (P), and lithium (Li) as at least constituent elements among the sulfide-based solid electrolyte materials described above, for example. For example, the solid electrolyte may be a material containing Li2S-P2S5. When using a sulfide-based solid electrolyte material containing Li2S-P2S5 to form the solid electrolyte, the molar ratio of Li2S and P2S5 is, for example, in the range of Li2S : P2S5 = 50 : 50 to 90 : 10.

[0061] In one embodiment, the solid electrolyte in the solid electrolyte layer (30) is Li 7-a M a PS 6-c X c It may be an argyrodite-type compound containing . Here, X may be Cl, Br, or a combination thereof. M may be Na, K, Fe, Mg, Ca, Ag, Cu, Zr, Zn, or a combination thereof. a and c may each be a real number between 0 and 2.

[0062] The density of the azyrodite-type solid electrolyte may be 1.5 g / cc to 2.0 g / cc. By having a density of 1.5 g / cc or higher for the azyrodite-type solid electrolyte, the internal resistance of the all-solid-state battery is reduced, and defects such as penetration and short circuit of the solid electrolyte film due to lithium dendrite formation can be prevented. The elastic modulus of the solid electrolyte in the solid electrolyte layer (30) is, for example, 15 GPa to 35 GPa.

[0063] The solid electrolyte layer (30) may further include a binder. The binder included in the solid electrolyte layer (30) is, for example, styrene butadiene rubber (SBR), polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, etc., but is not limited to these. The binder of the solid electrolyte layer (30) may be the same as or different from the binder included in the positive electrode active material layer (12) or the binder included in the negative electrode coating layer (22).

[0064] Referring again to FIG. 1, the first solid electrolyte layer (31) may have a first thickness (t1), and the second solid electrolyte layer (32) may have a second thickness (t2). The solid electrolyte layer (30) may have a third thickness (T). The first thickness (t1) and the second thickness (t2) may have different thicknesses. The second thickness (t2) may be greater than the first thickness (t1).

[0065] The thinner the thickness of the solid electrolyte layer (30), the higher the energy density, but on the other hand, it is difficult to suppress the formation of lithium dendrites in the negative electrode, so there is a possibility of a short circuit.

[0066] In solid electrolytes, voids can form at the interface between the electrode and the electrolyte, which act as interfacial resistance and can lead to battery performance degradation.

[0067] Interfacial resistance can be reduced by applying pressure to the electrode and the solid electrolyte layer together. In one embodiment, since the sulfide-based solid electrolyte has high ionic conductivity and is mechanically soft, an all-solid-state battery with improved interfacial resistance can be fabricated through pressure application.

[0068] In one embodiment of the present invention, the anode layer (10) and the cathode layer (20) may include a pressurization process in the manufacturing process. In one embodiment of the present invention, the pressurization process may be performed by applying different pressures to each of the anode layer (10) and the cathode layer (20). In one embodiment of the present invention, the anode layer (10) may be manufactured by applying a relatively higher pressure compared to the cathode layer (20). For example, applying nanoscale particles to the anode and cathode active materials can increase the contact area with the solid electrolyte and improve interfacial resistance. In one embodiment, the anode active material may be in a polycrystalline form for reasons such as improved adhesion to the electrode plate, capacity characteristics, and lifespan characteristics, and may include secondary particles formed by the aggregation of at least two primary particles. In this case, the interface resistance between the anode layer (10) and the first solid electrolyte layer (31) is observed to be greater than the interface resistance between the cathode layer (20) and the second solid electrolyte layer (32), so the anode laminate can be manufactured by applying a relatively higher pressure compared to the cathode laminate. However, this is not limited thereto, and the anode layer (10) and the cathode layer (20) can be manufactured through a pressurization process in which different pressures are applied to each for various reasons.

[0069] One embodiment of the present invention can solve process problems that may occur when the interfacial resistance between the anode layer (10) and the first solid electrolyte layer (31) is different from the interfacial resistance between the cathode layer (20) and the second solid electrolyte layer (32) by dividing the solid electrolyte layer (30) into a first solid electrolyte layer (31) and a second solid electrolyte layer (32). For example, an all-solid-state battery manufactured according to the all-solid-state battery manufacturing method described below can provide an all-solid-state battery manufactured by applying different pressures to the anode stack and the cathode stack, respectively.

[0070] In one embodiment of the present invention, the solid electrolyte layer (30) is divided into a first solid electrolyte layer (31) and a second solid electrolyte layer (32), and the thickness of each is adjusted differently so that the formation of lithium dendrites in the negative electrode can be suppressed while increasing energy density. This allows for the provision of an all-solid-state battery (ASB) with improved stability against short-circuit risk and shock and high energy density.

[0071] The ratio of the second thickness t2 to the first thickness t1 (t2 / t1) may be 1 to 20. Specifically, the ratio of the second thickness t2 to the first thickness t1 (t2 / t1) may be 2 to 15, 4 to 11, or 4.5 to 5.5. When the ratio of the second thickness t2 to the first thickness t1 (t2 / t1) is within the aforementioned numerical range, it is possible to provide an all-solid-state battery (ASB) with high energy density and improved stability against short-circuit risk and shock by suppressing the formation of lithium dendrites in the negative electrode while increasing energy density.

[0072] The first thickness (t1) may be 30 μm or less. Specifically, the first thickness (t1) may be 25 μm or less, 20 μm or less, 14 μm or less, or 10 μm or less. The first thickness (t1) may be 0.1 μm or more. Specifically, the first thickness (t1) may be 1 μm or more, 2 μm or more, 4 μm or more, or 5 μm or more. If the first thickness (t1) exceeds the numerical range mentioned above, the energy density of the all-solid-state battery (ASB) may decrease. If the first thickness (t1) does not fall within the numerical range mentioned above, the first thickness (t1) may not be sufficient to form an interface with respect to the diameter of the active material powder in the anode.

[0073] The second thickness (t2) may be 30 μm or more. Specifically, it may be 35 μm or more, 40 μm or more, 45 μm or more, 50 μm or more, 55 μm or more, and 60 μm or more. The second thickness (t2) may be 120 μm or less. Specifically, the second thickness (t2) may be 90 μm or less and 60 μm or less. If the second thickness (t2) does not fall within the aforementioned numerical range, it may be difficult to suppress the formation of lithium dendrites within the negative electrode, and there may be a risk of a short circuit. If the second thickness (t2) exceeds the aforementioned numerical range, the energy density of the all-solid-state battery (ASB) may decrease.

[0074] The third thickness (T) may be 120 μm or less. Specifically, the third thickness (T) may be 90 μm or less and 60 μm or less. The third thickness (T) may be 10 μm or more. Specifically, the third thickness (T) may be 30 μm or more and 50 μm or more. If the third thickness (T) exceeds the above numerical range, the energy density of the all-solid-state battery (ASB) may decrease.

[0075] Referring to FIGS. 1 and 2, the area of ​​the anode layer (10) and the area of ​​the cathode layer (20) may differ from each other. Specifically, the area of ​​the cathode layer (20) may be larger than the area of ​​the anode layer (10). The anode layer (10) may be completely superimposed within the cathode layer (20).

[0076] In one embodiment of the present invention, the first solid electrolyte layer (31) may have substantially the same area as the anode layer (10). The second solid electrolyte layer (32) may have substantially the same area as the cathode layer (20).

[0077] Referring to FIGS. 1 and 2, the first solid electrolyte layer (31) may have a first width (W1) in the first direction (D1). The second solid electrolyte layer (32) may have a second width (W2) in the first direction (D1). The first width (W1) may be smaller than the second width (W2).

[0078] The difference between the second width (W2) and the first width (W1) may be 10 mm or less. Specifically, the difference between the second width (W2) and the first width (W1) may be 8 mm or less, 5 mm or less, or 3 mm or less. The difference between the second width (W2) and the first width (W1) may be 0.1 mm or more, 0.5 mm or more, or 1 mm or more. If the above numerical range is exceeded, the size of the anode layer (10) becomes relatively smaller, so the discharge capacity is lowered and the energy density of the all-solid-state battery (ASB) may decrease. If the above numerical range is not met, it is difficult to suppress the formation of lithium dendrites in the negative electrode, and there may be a risk of a short circuit.

[0079] The ratio (W2 / W1) of the second width (W2) to the first width (W1) may be 1 to 1.6. Specifically, the ratio (W2 / W1) of the second width (W2) to the first width (W1) may be 1 to 1.5, 1 to 1.4, 1 to 1.3, 1 to 1.2, or 1 to 1.1.

[0080] If the ratio (W2 / W1) of the second width (W2) to the first width (W1) exceeds the numerical range, the energy density of the all-solid-state battery (ASB) is reduced.

[0081] Referring to FIGS. 1 and 2, the first solid electrolyte layer (31) may have a third width (W3) in the second direction (D2). The second solid electrolyte layer (32) may have a fourth width (W4) in the second direction (D2). The third width (W3) may be smaller than the fourth width (W4).

[0082] The difference between the third width (W3) and the fourth width (W4) may be 10 mm or less. Specifically, the difference between the third width (W3) and the fourth width (W4) may be 8 mm or less, 5 mm or less, or 3 mm or less. The difference between the fourth width (W4) and the third width (W3) may be 0.1 mm or more, 0.5 mm or more, or 1 mm or more. If the above numerical range is exceeded, the size of the anode layer (10) becomes relatively smaller, so the discharge capacity is lowered and the energy density of the all-solid-state battery (ASB) may decrease. If the above numerical range is not met, it is difficult to suppress the formation of lithium dendrites in the negative electrode, and there may be a risk of a short circuit.

[0083] The ratio (W4 / W3) of the fourth width (W4) to the third width (W3) may be 1 to 1.6. Specifically, the ratio (W4 / W3) of the fourth width (W4) to the third width (W3) may be 1 to 1.5, 1 to 1.4, 1 to 1.3, 1 to 1.2, or 1 to 1.1.

[0084] If the ratio (W4 / W3) of the fourth width (W4) to the third width (W3) exceeds the numerical range, the energy density of the all-solid-state battery (ASB) is reduced.

[0085]

[0086] FIGS. 3 and 4 disclose a bi-cell form of an all-solid-state battery according to embodiments of the present invention.

[0087] A bi-cell can be defined as a secondary battery in which the electrodes at both ends are identical. Furthermore, a bi-cell only requires that the electrodes at both ends be identical, and there may be no limit to the number of stacked electrode layers and solid electrolyte layers.

[0088] Referring to FIGS. 3 and 4, one embodiment of the bicell (BC) may be in a form in which a negative electrode layer (20), a solid electrolyte layer (30), an anode layer (10), a solid electrolyte layer (30), and a negative electrode layer (20) are sequentially stacked. Alternatively, the bicell (BC) may be in a form in which a first electrode body (EB1), a second electrode body (EB2), a second electrode body (EB2), and a first electrode body (EB1) are sequentially stacked.

[0089] Here, the negative electrode layer (20) may include a negative electrode current collector (21), a negative electrode coating layer (22), and a negative electrode tab (ATB). The negative electrode tab (ATB) may be connected to the negative electrode current collector (21). The positive electrode layer (10) may include a positive electrode current collector (11), a positive electrode active material layer (12), and a positive electrode tab (CTB). The positive electrode tab (CTB) may be connected to the positive electrode current collector (11).

[0090] The first electrode body (EB1) may include an anode layer (10) and a first solid electrolyte layer (31). The second electrode body (EB2) may include a cathode layer (20) and a second solid electrolyte layer (32).

[0091] As described above, the anode layer (10) can be formed with a smaller size than the cathode layer (20). The anode layer (10) can be laminated on the inside of the gasket (GK).

[0092]

[0093] FIGS. 5a to 5c disclose a process of taping the stack cells (STC) after stacking all-solid-state batteries into a stack cell (STC).

[0094] Referring to FIG. 5a, a stack cell (STC) can be formed by stacking multiple bicells (BC). At this time, an elastic sheet (ES) can be stacked between each of the multiple bicells (BC). An elastic pad (EL) can be stacked at the top and bottom of the stack cell (STC), respectively.

[0095] In the embodiments of the present invention, the elastic sheet (ES) and the elastic pad (EL) are distinguished by name, but may be composed of the same material, size, thickness, area, etc. A detailed explanation will be provided later.

[0096] Referring to FIG. 5b, after forming a stack cell (STC) by stacking multiple bicells (BC), a taping member (TAP) can be attached to the uppermost elastic pad (EL) and the lowermost elastic pad (EL) to fix the stack cell (STC). The taping member (TAP) may include multiple taping members (TAP). Multiple taping members (TAP) may be attached at multiple locations along the outer perimeter of the stack cell (STC).

[0097] Referring to FIG. 5c, after attaching and fixing a taping member (TAP) to a stack cell (STC), a plurality of positive tabs (CTB) can be gathered and connected to a positive lead tab (LCTB) by welding. Then, a plurality of negative tabs (ATB) can be gathered and connected to a negative lead tab (LATB) by welding.

[0098] In an embodiment of the present invention, the taping process of the all-solid-state battery may be a process of fixing the shape of the stack cell (STC) after forming the stack cell (STC).

[0099] Subsequently, the stack cell (STC) can be embedded in a prismatic case to become a prismatic all-solid-state battery. Since the prismatic case has a fixed shape, when the stack cell (STC) expands during charging and discharging, the prismatic case can apply pressure to the stack cell (STC) as a reaction force.

[0100] A stack cell (STC) can be packaged in a pouch to become a pouch-type all-solid-state battery. The pouch-type all-solid-state battery can be placed on a separate pressurizing device. When the stack cell (STC) expands during charging and discharging, the separate pressurizing device can apply pressure to the stack cell (STC).

[0101]

[0102] Referring to FIGS. 6 and 7, an all-solid-state battery according to an embodiment of the present invention may include a battery cell (STC), an elastic pad (EL), and a taping member (TAP).

[0103] A battery cell (STC) may include a positive electrode layer (10), a negative electrode layer (20), and a solid electrolyte layer (30). The solid electrolyte layer (30) may be disposed between the positive electrode layer (10) and the negative electrode layer (20). In an embodiment of the present invention, the battery cell (STC) may be a stack cell. The battery cell (STC) may be in the form of a plurality of bicells (BC) stacked together.

[0104] The battery cell (STC) may include a plurality of elastic sheets (ES). The plurality of elastic sheets (ES) may be disposed between a plurality of bicells (BC). The elastic sheets (ES) may be omitted in the battery cell (STC) according to design specifications.

[0105]

[0106] At least one elastic pad (EL) may be provided, and the elastic pad (EL) may be placed on at least one of the upper and lower parts of the battery cell (STC). In an embodiment of the present invention, the elastic pad (EL) may be in the shape of a square plate.

[0107] In an embodiment of the present invention, the material of the elastic pad (EL) may include at least one selected from the group consisting of urethane rubber, nitrile rubber, butyl rubber, fluororubber, chloroprene rubber, ethylene rubber, and silicone rubber. However, this is merely an example and may be composed of other materials. The elastic sheet (ES) may be composed of the same material as the elastic pad (EL). The elastic pad (EL) and the elastic sheet (ES) may have the same size, shape, thickness, area, etc.

[0108] The elastic pad (EL) may include a plurality of elastic pads (EL). The plurality of elastic pads (EL) may be placed on the upper and lower parts of the battery cell (STC), respectively.

[0109] The elastic pad (EL) may include an upper elastic pad (EL1) and a lower elastic pad (EL2). The upper elastic pad (EL1) may be stacked on the top of the battery cell (STC). The lower elastic pad (EL2) may be stacked on the bottom of the battery cell (STC).

[0110] When the battery cell (STC) expands during charging and discharging, the elastic pad (EL) can contract due to elasticity. At this time, the elastic pad (EL) generates an elastic force that attempts to restore it to its original thickness, thereby allowing a relatively uniform pressure to be applied to the battery cell (STC).

[0111] The taping member (TAP) can be attached to the upper elastic pad (EL1) and the lower elastic pad (EL2).

[0112] In an embodiment of the present invention, the material of the taping member (TAP) may include materials such as polyester (PET), acrylic, nitrocellulose, silicone, and nylon. However, this is merely an example and may be composed of other materials.

[0113]

[0114] In an embodiment of the present invention, on a plane formed by the first direction (D1) and the second direction (D2), the area of ​​the anode layer (10) may be formed to be smaller than the area of ​​the cathode layer (20). The anode layer (10) and the cathode layer (20) may each be formed in a generally rectangular shape. Accordingly, the rectangular area of ​​the anode layer (10) may be smaller than the rectangular area of ​​the cathode layer (20).

[0115] Specifically, with respect to the first direction (D1), the first anode length (P1) of the anode layer (10) can be formed to be smaller than the first cathode length (M1) of the cathode layer (20). Accordingly, between the edge of the anode layer (10) and the edge of the cathode layer (20), the taping region (K1) can form a first region length (G1).

[0116] Additionally, based on the second direction (D2), the second anode length (P2) of the anode layer (10) can be formed to be smaller than the second cathode length (M2) of the cathode layer (20). Accordingly, between the edge of the anode layer (10) and the edge of the cathode layer (20), the taping region (K1) can form a second region length (G2).

[0117]

[0118] In an embodiment of the present invention, a taping area (K1) and a non-taping area (K2) may be partitioned on the elastic pad (EL) based on the third direction (D3).

[0119] The non-taping area (K2) can define an area corresponding to the area of ​​the anode layer (10) on the elastic pad (EL).

[0120] The taping area (K1) can define the outer part of the non-taping area (K2) on the elastic pad (EL). In other words, the taping area (K1) can define an area on the elastic pad (EL) that does not correspond to the area of ​​the anode layer (10).

[0121] The taping member (TAP) can be attached to the taping area (K1). In other words, the taping member (TAP) can be attached to the outer portion of the anode layer (10) on the elastic pad (EL). The anode layer (10) can contribute to the capacity of the all-solid-state battery. Therefore, it may be important to apply a uniform pressure over the area of ​​the anode layer (10).

[0122] If a taping member (TAP) is attached to an area of ​​the anode layer (10), the anode layer (10) may not be subjected to uniform pressure due to the thickness (T1) of the taping member (TAP). In other words, if at least a portion of the taping member (TAP) is attached to a non-taping area (K2), it may affect the anode layer (10). According to embodiments of the present invention, by separating the taping member (TAP) from the non-taping area (K2), it is possible to prevent it from affecting the anode layer (10).

[0123]

[0124] The battery cell (STC) may further include a gasket (GK). On the plane formed by the first direction (D1) and the second direction (D2), the gasket (GK) may be arranged to surround the outer perimeter of the positive electrode layer (10).

[0125] The area of ​​the taping area (K1) can be formed to be equal to or smaller than the area of ​​the gasket (GK). In other words, the taping area (K1) can be formed on the elastic pad (EL) at a position corresponding to the area of ​​the gasket (GK).

[0126] When a taping member (TAP) is attached to the taping area (K1), the taping member (TAP) can be attached to a portion corresponding to the area of ​​the gasket (GK) based on the third direction (D3). The attachment of the taping member (TAP) may not affect the anode layer (10).

[0127] Here, the length (H3) of the gasket (GK) may be formed to be greater than or at least equal to the length of the first region (G1) and the second region (G2). Due to this length structure, even if the taping member (TAP) is attached in contact with the boundary line (K0) between the non-taping region (K2) and the taping region (K1), the taping member (TAP) can be attached to the corresponding part of the gasket (GK) on the elastic pad (EL). This can minimize the degree of unevenness of the pressure due to the thickness (T1) of the taping member (TAP) when pressure is applied to the anode layer (10) by the upper elastic pad (EL1) and the lower elastic pad (EL2).

[0128]

[0129] Referring to FIGS. 8 and 9, the elastic pad (EL) according to an embodiment of the present invention may further include a taping groove (TAG). The taping groove (TAG) may be formed concavely on the edge of the elastic pad (EL).

[0130] The taping groove (TAG) may include a plurality of taping grooves (TAG). The plurality of taping grooves (TAG) may be spaced apart from each other on the taping area (K1).

[0131] The taping member (TAP) can be attached to the taping groove (TAG) on the taping area.

[0132] Based on the third direction (D3) above, the height (H1) of the taping groove (TAG) may be formed to be equal to or greater than the thickness (T1) of the taping member (TAP).

[0133] Referring to FIG. 9, if the height (H1) of the taping groove (TAG) is equal to the thickness (T1) of the taping member (TAP), when the taping member (TAP) is attached to the taping groove (TAG), the taping member (TAP) can form the same height as the elastic pad (EL). In this case, both the non-taping area (K2) and the taping area (K1) can form the same height. Therefore, the non-taping area (K2) and the taping area (K1) of the elastic pad can apply a uniform pressure to the battery cell (STC).

[0134] For example, in the case of a prismatic all-solid-state battery, the prismatic case can apply uniform pressure to both the positive electrode layer (10) and the negative electrode layer (20) through the upper elastic pad (EL1) and the lower elastic pad (EL2). In the case of a pouch-type all-solid-state battery, a separate pressure device can apply uniform pressure to both the positive electrode layer (10) and the negative electrode layer (20) through the upper elastic pad (EL1) and the lower elastic pad (EL2).

[0135] If the height (H1) of the taping groove (TAG) is greater than the thickness (T1) of the taping member (TAP), when the taping member (TAP) is attached to the taping groove (TAG), the height of the elastic pad (EL) can be formed to be greater than the height of the taping member (TAP). In this case, the area (ATAP; see FIG. 8) excluding the taping groove (TAG) on the taping area (K1) can form the same height as the non-taping area (K2).

[0136] In other words, since the area excluding the taping groove (TAG) (ATAP) and the non-taping area (K2) form the same height, the elastic pad can apply a relatively uniform pressure to the battery cell (STC).

[0137] For example, in the case of a prismatic all-solid-state battery, the prismatic case can apply a relatively uniform pressure to both the positive electrode layer (10) and the negative electrode layer (20) through the upper elastic pad (EL1) and the lower elastic pad (EL2). In the case of a pouch-type all-solid-state battery, a separate pressure device can apply a relatively uniform pressure to both the positive electrode layer (10) and the negative electrode layer (20) through the upper elastic pad (EL1) and the lower elastic pad (EL2).

[0138] Meanwhile, the length (H2) of the taping groove (TAG) may be formed to be smaller than or equal to the length of the first region (G1) and the second region (G2).

[0139] The length (H2) of the taping groove (TAG) may be formed to be smaller than or equal to the length (H3) of the gasket (GK).

[0140] Due to this length structure, when the taping member (TAP) is attached to the taping groove (TAG), the taping member (TAP) may be positioned in contact with the boundary line (K0) between the non-taping area (K2) and the taping area (K1), or may be positioned spaced apart from the boundary line (K0) at a predetermined distance. Additionally, the taping member (TAP) may be attached to the corresponding portion of the gasket (GK) on the elastic pad (EL). This minimizes the degree of unevenness of the pressure caused by the thickness (T1) of the taping member (TAP) when pressure is applied to the anode layer (10) by the upper elastic pad (EL1) and the lower elastic pad (EL2).

[0141] In the all-solid-state battery according to the embodiment of the present invention, through the configuration described above, when the elastic pad (EL) applies pressure to the positive electrode layer (10), the thickness (T1) of the taping member (TAP) may not affect the positive electrode layer (10). Accordingly, a relatively uniform pressure can be applied to the positive electrode layer (10), the negative electrode layer (20), and the solid electrolyte layer (30). This can improve the performance of the all-solid-state battery.

[0142]

[0143] Hereinafter, with reference to FIGS. 9 and FIGS. 10, a method for manufacturing an all-solid-state battery according to an embodiment of the present invention will be described.

[0144] Referring to FIG. 9, a method for manufacturing an all-solid-state battery according to one embodiment may include forming a battery cell (STC) (S1), placing at least one elastic pad (EL) on at least one of the upper and lower parts of the battery cell (STC) (S2), partitioning a taping area (K1) and a non-taping area (K2) on the elastic pad (EL) (S3), attaching a taping member (TAP) to the taping area (K1) (S4), determining whether the taping member (TAP) is attached to the taping area (K1) (S5), discharging the battery cell (S6), removing the taping member (TAP) from the battery cell (STC) (S7a, S7b), and reattaching the taping member (TAP) (S7c).

[0145]

[0146] Forming the above battery cell (STC) (S1) may involve a control unit driving a stack cell stacking device to stack a positive electrode layer (10), a negative electrode layer (20), and a solid electrolyte layer (30) to form a battery cell (STC).

[0147] Referring to FIGS. 1 and 2, the anode layer (10) may include an anode current collector (11) and an anode active material layer (12). The cathode layer (20) may include a cathode current collector (21) and a cathode coating layer (22). A solid electrolyte layer (30) may be disposed between the anode layer (10) and the cathode layer (20). The solid electrolyte layer (30) may include a first solid electrolyte layer (31) and a second solid electrolyte layer (32).

[0148] In one embodiment of this step (S1), a positive current collector (11), a positive active material layer (12), and a first solid electrolyte layer (31) may be stacked to form a first electrode body (EB1). A negative current collector (21), a negative coating layer (22), and a second solid electrolyte layer (32) may be stacked to form a second electrode body (EB2).

[0149] A monocell shape of an all-solid-state battery can be formed by stacking the first electrode body (EB1) and the second electrode body (EB2).

[0150] At this time, the size of the first electrode body (EB1) can be formed to be smaller than the size of the second electrode body (EB2).

[0151] Specifically, in this step (S1), on the plane formed by the first direction (D1) and the second direction (D2), the area of ​​the anode layer (10) can be formed to be smaller than the area of ​​the cathode layer (20). Additionally, the anode layer (10) and the cathode layer (20) can each be formed in a generally rectangular shape. Accordingly, the rectangular area of ​​the anode layer (10) can be smaller than the rectangular area of ​​the cathode layer (20).

[0152] Based on the first direction (D1), the first anode length (P1) of the anode layer (10) can be formed to be smaller than the first cathode length (M1) of the cathode layer (20). Accordingly, between the edge of the anode layer (10) and the edge of the cathode layer (20), the taping region (K1) can form a first region length (G1).

[0153] Based on the second direction (D2), the second anode length (P2) of the anode layer (10) can be formed to be smaller than the second cathode length (M2) of the cathode layer (20). Accordingly, between the edge of the anode layer (10) and the edge of the cathode layer (20), the taping region (K1) can form a second region length (G2).

[0154] Referring to FIGS. 3 and 4, in one embodiment of the present step (S1), a bicell (BC) can be formed by stacking a plurality of monocells. Accordingly, the bicell (BC) can form a stacked structure in the order of a negative electrode layer (20), a solid electrolyte layer (30), an anode layer (10), a solid electrolyte layer (30), and a negative electrode layer (20).

[0155] In one embodiment of this step (S1), the gasket (GK) can be arranged to surround the outer perimeter of the anode layer (10) on a plane formed by the first direction (D1) and the second direction (D2).

[0156] Referring to FIG. 5a, in one embodiment of this step (S1), a plurality of bicells (BC) can be stacked to form a stack cell (STC).

[0157] In summary, in one embodiment of the present step (S1), a plurality of monocells can be stacked to produce a bicell (BC), and a plurality of bicells (BC) can be stacked to form a stack cell. Therefore, the battery cell (STC) may be in the form of a stack cell.

[0158] At this time, an elastic sheet (ES) may be laminated between multiple bicells (BC). However, the elastic sheet (ES) may be omitted depending on the design specifications.

[0159]

[0160] Placing at least one elastic pad (EL) on at least one of the upper and lower parts of the battery cell (STC) (S2) can be achieved by the control unit driving the elastic pad stacking device to place at least one elastic pad (EL) on at least one of the upper and lower parts of the battery cell (STC).

[0161] Referring to FIG. 5a and FIG. 12a, in one embodiment of the present step (S2), a plurality of elastic pads (EL) can be placed on the upper and lower parts of the battery cell (STC), respectively.

[0162] Referring to FIG. 5a, when stacking multiple bicells (BC), elastic pads (EL) can be stacked between the multiple bicells (BC). In other words, forming a battery cell (STC) (S1) may include stacking elastic pads (EL) between the multiple bicells (BC).

[0163] In this step (S2), an upper elastic pad (EL1) can be laminated on the upper part of the battery cell (STC) or a lower elastic pad (EL2) can be laminated on the lower part of the battery cell (STC).

[0164] Alternatively, in this step (S2), an upper elastic pad (EL1) and a lower elastic pad (EL2) can be laminated on the upper and lower parts of the battery cell (STC), respectively.

[0165]

[0166] Regarding the division of the taping area (K1) and the non-taping area (K2) on the elastic pad (EL) (S3), with reference to FIG. 12b, the control unit can divide the taping area (K1) where the taping member (TAP) is attached and the non-taping area (K2) where the taping member (TAP) is not attached on the elastic pad (EL) through a vision device.

[0167] The shape, size, and area of ​​the anode layer (10) and the cathode layer (20) can be pre-entered into the control unit. The shape, size, and area of ​​the anode layer (10) and the cathode layer (20) can be determined according to design specifications. The shape, size, and area corresponding to the anode layer (10) on the elastic pad (EL) can be pre-entered into the control unit as a non-taping area (K2). The area corresponding to the outer part of the non-taping area (K2) on the elastic pad (EL) can be pre-entered into the control unit as a taping area (K1).

[0168] The taping area (K1) may be an area corresponding to the gasket (GK). Additionally, the taping area (K1) may correspond to an area of ​​the cathode layer (20) excluding the area of ​​the anode layer (10).

[0169] In one embodiment of this step (S2), the taping area (K1) and the non-taping area (K2) input according to the design specifications of the anode layer (10) and the cathode layer (20) can be identified on the elastic pad (EL) through a vision device.

[0170] Specifically, in this step (S2), a taping region (K1) can be formed with a first region length (G1) between the edge of the anode layer (10) and the edge of the cathode layer (20) based on the first direction (D1).

[0171] And based on the second direction (D2), a taping region (K1) can be formed with a second region length (G2) between the edge of the anode layer (10) and the edge of the cathode layer (20).

[0172] In this step (S2), on the plane formed by the first direction (D1) and the second direction (D2), the area of ​​the taping region (K1) can be formed smaller than or equal to the area of ​​the gasket (GK).

[0173] Accordingly, the first region length (G1) and the second region length (G2) can be formed to be smaller than or equal to the length (H3) of the gasket (GK).

[0174]

[0175] Attaching a taping member (TAP) to the taping area (K1) (S4) can be done by a control unit driving a taping device to attach a taping member (TAP) to the taping area (K1) formed on the outer part of the anode layer (10), as shown in FIG. 12c. In this step (S4), by attaching the taping member (TAP) to the outer part of the anode layer (10), it is possible to prevent uneven pressure from being applied to the anode layer (10) due to the thickness of the taping member (TAP).

[0176]

[0177] Determining whether the above-mentioned taping member (TAP) is attached to the taping area (K1) (S5) can be done by the control unit determining whether the taping member (TAP) is properly attached to the taping area (K1) through a vision device, as shown in FIG. 10.

[0178] The vision device can determine the attachment status of the taping member (TAP) and transmit attachment status information to the control unit. The control unit can determine whether the attachment status of the taping member (TAP) is normal through the attachment status information.

[0179] If the taping member (TAP) is attached to the taping area (K1) (e.g.), the battery cell (STC) can be discharged (S6).

[0180] If the taping member (TAP) is attached to the non-taping area (K2) (No), removing the taping member (TAP) from the battery cell (STC) (S7a, S7b) and reattaching the taping member (TAP) (S7c) may be performed.

[0181]

[0182] Discharging the battery cell (STC) (S6) can be performed by the control unit driving a transfer device to transfer the battery cell (STC) to the electrode tab welding process disclosed in FIG. 5c when the taping member (TAP) is normally attached to the taping area (K1). During the electrode tab welding process, a plurality of positive tabs (CTB) and negative tabs (ATB) of the battery cell (STC) can be welded respectively. A plurality of positive tabs (CTB) can be welded and connected to a single positive lead tab (LCTB). A plurality of negative tabs (ATB) can be welded and connected to a single negative lead tab (LATB).

[0183]

[0184] Removing the taping member (TAP) from the battery cell (STC) (S7a, S7b) allows the control unit to identify the incorrectly attached taping member (TAP) in the battery cell (STC) through a vision device. Referring to FIG. 12c, an example is disclosed in which one of the multiple taping members (TAP) has been incorrectly attached (TAPa). If the incorrectly attached taping member (TAPa) extends beyond the boundary line (K0) to the non-taping area (K2), the vision device can identify the incorrectly attached taping member (TAPa). Referring to FIG. 12d, the control unit can remove the incorrectly attached taping member (TAPa) by driving a taping removal device.

[0185]

[0186] Reattaching the above taping member (TAP) (S8) can be done by the control unit driving the taping device to reattach the taping member (TAP) to the incorrectly attached area of ​​the taping area (K1). Referring to FIG. 12e, the state in which the taping member (TAP) is properly attached to the area where the incorrectly attached taping member (TAP) was removed is disclosed. The properly attached taping member (TAP) can be attached to the taping area (K1).

[0187] Afterwards, the discharge of the above battery cell (STC) (S6) can be performed.

[0188]

[0189] Referring to FIG. 11, a method for manufacturing an all-solid-state battery according to another embodiment comprises forming a battery cell (STC) (S1), placing at least one elastic pad (EL) on at least one of the upper and lower portions of the battery cell (STC) (S2), partitioning a taping area (K1) and a non-taping area (K2) on the elastic pad (EL) (S3), detecting a taping groove (TAG) formed on the taping area (K1) (S4a), attaching a taping member (TAP) to the taping groove (TAG) of the taping area (K1) (S4b), determining whether the taping member (TAP) is attached to the taping area (K1) (S5), discharging the battery cell (S6), removing the taping member (TAP) from the battery cell (STC) (S7a, S7b), and reattaching the taping member (TAP). It may include (S7c).

[0190]

[0191] Forming the above battery cell (STC) (S1) may involve a control unit driving a stack cell stacking device to stack a positive electrode layer (10), a negative electrode layer (20), and a solid electrolyte layer (30) to form a battery cell (STC). The battery cell (STC) may be a stack cell formed by stacking a plurality of bicells (BC).

[0192] At this time, an elastic sheet (ES) may be laminated between multiple bicells (BC). However, the elastic sheet (ES) may be omitted depending on the design specifications.

[0193] The specific configuration of this step (S1) is the same as that described in FIG. 10, so please refer to the above description.

[0194]

[0195] Placing at least one elastic pad (EL) on at least one of the upper and lower parts of the battery cell (STC) (S2) may involve stacking an upper elastic pad (EL) 1 with a taping groove (TAG) formed thereon on the upper part of the battery cell (STC). Alternatively, a lower elastic pad (EL2) with a taping groove (TAG) formed thereon may be stacked on the lower part of the battery cell (STC).

[0196] Alternatively, an upper elastic pad (EL1) and a lower elastic pad (EL1) with a taping groove (TAG) formed on the upper and lower parts, respectively, of a battery cell (STC) can both be laminated.

[0197] Referring to FIG. 9, the height (H1) of the taping groove (TAG) on the elastic pad (EL) may be formed to be equal to or greater than the thickness (T1) of the taping member (TAP). The length (H2) of the taping groove (TAG) may be formed to be smaller than or equal to the length of the first region (G1) and the second region (G2). Additionally, the length (H2) of the taping groove (TAG) may be formed to be smaller than or equal to the length (H3) of the gasket (GK).

[0198] Due to this length structure, when the taping member (TAP) is attached to the taping groove (TAG), the taping member (TAP) may be positioned in contact with the boundary line (K0) between the non-taping area (K2) and the taping area (K1), or may be positioned spaced apart from the boundary line (K0) at a predetermined distance. Additionally, the taping member (TAP) may be attached to the corresponding part of the gasket (GK) on the elastic pad (EL).

[0199]

[0200] The division of the taping area (K1) and the non-taping area (K2) on the elastic pad (EL) (S3) can be performed by the control unit using a vision device to divide the taping area (K1) where the taping member (TAP) is attached and the non-taping area (K2) where the taping member (TAP) is not attached on the elastic pad (EL).

[0201] The shape, size, and area of ​​the anode layer (10) and the cathode layer (20) can be pre-entered into the control unit. The shape, size, and area of ​​the anode layer (10) and the cathode layer (20) can be determined according to design specifications. The shape, size, and area corresponding to the anode layer (10) on the elastic pad (EL) can be pre-entered into the control unit as a non-taping area (K2). The area corresponding to the outer part of the non-taping area (K2) on the elastic pad (EL) can be pre-entered into the control unit as a taping area (K1).

[0202] At this time, the taping area (K1) may be an area corresponding to the gasket (GK). Also, the taping area (K1) may correspond to an area excluding the area of ​​the anode layer (10) from the area of ​​the cathode layer (20).

[0203] In one embodiment of this step (S2), the taping area (K1) and the non-taping area (K2) input according to the design specifications of the anode layer (10) and the cathode layer (20) can be identified on the elastic pad (EL) through a vision device.

[0204] The specific configuration of this step (S3) is the same as that described in FIG. 10, so please refer to the above description.

[0205]

[0206] Detecting the taping groove (TAG) formed on the taping area (K1) (S4a) can be performed by the control unit detecting the taping groove (TAG) formed on the taping area (K1) through a vision device. Referring to FIG. 8, a plurality of taping grooves (TAG) may be formed on the elastic pad (EL). The vision device can detect the plurality of taping grooves (TAG) to identify the location where the taping member (TAP) is to be attached.

[0207]

[0208] Attaching a taping member (TAP) to the taping groove (TAG) of the taping area (K1) (S4b) can be done by the control unit driving a separate attachment device to attach the taping member (TAP) to the taping groove (TAG) of the taping area (K1). In this step (S4), by attaching the taping member (TAP) to the taping groove (TAG), it is possible to prevent uneven pressure from being applied to the anode layer (10) due to the thickness of the taping member (TAP).

[0209]

[0210] Determining whether the above-mentioned taping member (TAP) is attached to the taping groove (TAG) of the taping area (K1) (S5) may be a control unit determining whether the taping member (TAP) is properly attached to the taping groove (TAG) of the taping area (K1) through a vision device.

[0211] The vision device can determine the attachment status of the taping member (TAP) and transmit attachment status information to the control unit. The control unit can determine whether the attachment status of the taping member (TAP) is normal through the attachment status information.

[0212] If the taping member (TAP) is attached to the taping groove (TAG) of the taping area (K1) (e.g.), the battery cell (STC) can be discharged (S6).

[0213] If the taping member (TAP) is attached by detaching from the taping groove (TAG) of the taping area (K1) (No), removing the taping member (TAP) from the battery cell (STC) (S7a, S7b) and reattaching the taping member (TAP) (S7c) may be performed.

[0214]

[0215] Discharging the battery cell (STC) (S6) can be performed by the control unit driving a transfer device to transfer the battery cell (STC) to the electrode tab welding process disclosed in FIG. 5c when the taping member (TAP) is normally attached to the taping groove (TAG) of the taping area (K1). During the electrode tab welding process, a plurality of positive tabs (CTB) and negative tabs (ATB) of the battery cell (STC) can be welded respectively. A plurality of positive tabs (CTB) can be welded and connected to a single positive lead tab (LCTB). A plurality of negative tabs (ATB) can be welded and connected to a single negative lead tab (LATB).

[0216]

[0217] Removing the taping member (TAP) from the battery cell (STC) (S7a, S7b) can be performed by the control unit identifying the incorrectly attached taping member (TAP) from the battery cell (STC) through a vision device. The incorrectly attached taping member (TAPa) may be attached by detaching from the taping groove (TAG). The vision device can identify the incorrectly attached taping member (TAPa). The control unit can remove the incorrectly attached taping member (TAPa) by driving a separate taping removal device.

[0218]

[0219] Reattaching the above taping member (TAP) (S8) can be done by the control unit driving the taping device to reattach the taping member (TAP) to the taping groove (TAG) of the taping area (K1). The taping member (TAP) can be reattached to the position of the taping groove (Tag) from which the incorrectly attached taping member (TAP) was removed. The properly attached taping member (TAP) can be attached to the taping area (K1).

[0220] Afterwards, the discharge of the above battery cell (STC) (S6) can be performed.

[0221]

[0222] The all-solid-state battery and the method for manufacturing the all-solid-state battery according to the present invention, through the above-described configuration, can suppress the interference of uniform pressure due to the thickness of the tape during charging and discharging of the stack cell by attaching a tape to an outer region that does not overlap with the positive electrode layer on the stack cell.

[0223] In addition, by forming a taping groove on an elastic sheet laminated on a stack cell and attaching a tape to the taping groove, it is possible to suppress the interference of uniform pressure due to the thickness of the tape during the charging and discharging of the stack cell.

[0224] This increases the interfacial contact force between the electrode active material and the solid electrolyte and ensures uniform pressure between the interfaces, thereby improving the performance of the all-solid-state battery.

[0225] Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto and can be implemented with various modifications within the scope of the claims, the detailed description of the invention, and the attached drawings, and it is obvious that such modifications also fall within the scope of the present invention.

Claims

A battery cell comprising an anode layer, a cathode layer, and a solid electrolyte layer disposed between the anode layer and the cathode layer; At least one elastic pad disposed on at least one of the upper and lower parts of the battery cell; and A taping member attached to at least one elastic pad; comprising On the plane formed by the first direction (D1) and the second direction (D2), the area of ​​the anode layer is smaller than the area of ​​the cathode layer, and Based on the third direction (D3), on the elastic pad, A non-taping area is formed in an area corresponding to the area of ​​the anode layer, and A taped area is formed on the outer edge of the above-mentioned non-taped area, and The above-described taping member is an all-solid-state battery attached to the above-described taping area. In paragraph 1, Based on the first direction (D1) above, the first anode layer length (P1) of the anode layer is smaller than the first cathode layer length (M1) of the cathode layer, and A solid-state battery having a taping region having a first region length (G1) between the edge of the anode layer and the edge of the cathode layer. In paragraph 2, Based on the second direction (D2) above, the second anode layer length (P2) of the anode layer is smaller than the second cathode layer length (M2) of the cathode layer, and A solid-state battery having a taping region having a second region length (G2) between the edge of the anode layer and the edge of the cathode layer. In paragraph 3, The above battery cell further includes a gasket, and A solid-state battery in which, on the plane formed by the first direction (D1) and the second direction (D2), the gasket is arranged to surround the outer perimeter of the anode layer. In paragraph 4, A solid-state battery in which, on the plane formed by the first direction (D1) and the second direction (D2), the area of ​​the taping region is formed to be equal to or smaller than the area of ​​the gasket. In paragraph 5, A solid-state battery in which the length (H3) of the gasket is formed to be greater than or at least equal to the length of the first region (G1) and the second region (G2). In paragraph 4, A taping groove is formed on the above elastic pad, and The above taping groove is disposed on the above taping area, and A solid-state battery in which the taping member is attached to the taping groove. In Paragraph 7, Based on the above third direction (D3), A solid-state battery in which the height (H1) of the taping groove is formed to be equal to or greater than the thickness (T1) of the taping member. In Paragraph 7, A solid-state battery in which the length (H2) of the taping groove is formed to be smaller than or equal to the length of the first region (G1) and the length of the second region (G2). In Paragraph 9, A solid-state battery in which the length (H2) of the taping groove is formed to be smaller than or equal to the length (H3) of the gasket. Forming a battery cell comprising an anode layer, a cathode layer, and a solid electrolyte layer disposed between the anode layer and the cathode layer; Placing at least one elastic pad on at least one of the upper and lower parts of the battery cell; Partitioning a taping area and a non-taping area on the above elastic pad; and Attaching a taping member to the above-mentioned taping area; including, On the plane formed by the first direction (D1) and the second direction (D2), the area of ​​the anode layer is formed to be smaller than the area of ​​the cathode layer, and Based on the third direction (D3), on the elastic pad, The above non-taping region is formed in an area corresponding to the area of ​​the anode layer, and A method for manufacturing an all-solid-state battery, wherein the taping area is formed on the outer portion of the non-taping area. In Paragraph 11, Forming the above battery cell is, Based on the first direction (D1) above, the first anode layer length (P1) of the anode layer is formed to be smaller than the first cathode layer length (M1) of the cathode layer, and A method for manufacturing an all-solid-state battery, wherein the second anode length (P2) of the anode layer is formed to be smaller than the second cathode length (M2) of the cathode layer based on the second direction (D2). In Paragraph 12, The above battery cell further includes a gasket, and Forming the above battery cell is, A method for manufacturing an all-solid-state battery, wherein the gasket is arranged to surround the outer perimeter of the anode layer on a plane formed by the first direction (D1) and the second direction (D2). In Paragraph 13, Partitioning the taped area and the non-taped area on the above elastic pad is, Forming the taping region with a first region length (G1) between the edge of the anode layer and the edge of the cathode layer based on the first direction (D1); and Forming the taping region with a second region length (G2) between the edge of the anode layer and the edge of the cathode layer based on the second direction (D2); A method for manufacturing an all-solid-state battery comprising In Paragraph 14, Partitioning the taped area and the non-taped area on the above elastic pad is, A method for manufacturing an all-solid-state battery, wherein, on the plane formed by the first direction (D1) and the second direction (D2), the area of ​​the taping region is formed to be smaller than or equal to the area of ​​the gasket. In paragraph 15, Partitioning the taped area and the non-taped area on the above elastic pad is, A method for manufacturing an all-solid-state battery, wherein the first region length (G1) and the second region length (G2) are formed to be smaller than or equal to the length (H3) of the gasket. In Paragraph 12, Further including determining the attachment state of the above-mentioned taping member; Determining the attachment state of the above-mentioned taping member is, When the above taping member is attached to the above taping area (e.g.), discharging the battery cell; and A method for manufacturing an all-solid-state battery, comprising: determining a taping member incorrectly attached to the battery cell when the taping member is attached to the non-taping area (no); removing the taping member from the battery cell; and reattaching the taping member. In Paragraph 14, The elastic pad includes a taping groove formed on the taping area, and Based on the above third direction (D3), The height (H1) of the above taping groove is formed to be equal to or higher than the thickness (T1) of the above taping member, and The length (H2) of the above taping groove is formed to be smaller than or equal to the length of the first region (G1) and the length of the second region (G2), and A method for manufacturing an all-solid-state battery, wherein the length (H2) of the taping groove is formed to be smaller than or equal to the length (H3) of the gasket. In Paragraph 18, Detecting a taping groove formed on the above-mentioned taping area; A method for manufacturing an all-solid-state battery, further comprising In Paragraph 18, Further including determining the attachment state of the above-mentioned taping member; Determining the attachment state of the above-mentioned taping member is, When the above taping member is attached to the above taping groove (e.g.), discharging the battery cell; and A method for manufacturing an all-solid-state battery, comprising: determining a taping member incorrectly attached to a battery cell when the taping member is attached detached from the taping groove (no); removing the taping member from the battery cell; and reattaching the taping member.

Images