All-solid-state battery and method for producing same

Abstract

The all-solid-state battery comprises: an electrode layer having a current collector extending in a planar direction and an electrode active material layer disposed on at least one surface of the current collector; and a solid electrolyte layer disposed adjacent to the electrode layer in a stacking direction perpendicular to the planar direction, the electrode active material layer including an extended portion extending in the stacking direction and having a portion disposed adjacent to an adjacent electrode active material layer in the planar direction.

Description

[Technical field]

[0001] The present disclosure relates to an all-solid-state battery and a method for manufacturing the same. [Background technology]

[0002] As miniaturization and long-term use of portable electronic devices become commonplace, there is a demand for high-capacity batteries, and as wearable electronic devices become more widespread, there is a demand for battery safety. Therefore, the development of all-solid-state batteries that use solid electrolytes rather than liquid electrolytes is actively progressing.

[0003] The all-solid-state battery is a battery that replaces the existing liquid electrolyte with a solid electrolyte, and has the advantage that the risk of explosion due to the flammability of the liquid electrolyte can be greatly reduced, and that it does not use a liquid electrolyte and therefore can stably operate in harsh environments with relatively high temperature and pressure. In addition, in the all-solid-state battery, stacking can be realized without a separate cooling unit, and the all-solid-state battery has the advantage of realizing a relatively high energy density in the same volume, and therefore is expected to be used in the future.

[0004] The above information disclosed in this Background section is merely for enhancing understanding of the background of the described technology, and therefore, it may contain information that does not form part of the prior art already known in the country to those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0005] The described technology has been made in an effort to provide an all-solid-state battery in which the positive electrode active material or the negative electrode active material constituting the all-solid-state battery is designed to have improved capacity within a given volume.

[0006] Additionally, the described techniques have been made in an effort to provide a method for manufacturing an all-solid-state battery in which the positive or negative electrode active material is designed to have improved capacity within a given volume.

[0007] However, the problems solved by the embodiments are not limited to the above problems, and may be variously expanded within the scope of the technical concepts included in the present disclosure. [Means for solving the problem]

[0008] One embodiment provides an all-solid-state battery comprising: an electrode layer having a current collector extending in a planar direction and an electrode active material layer disposed on at least one surface of the current collector; and a solid electrolyte layer disposed adjacent to the electrode layer in a stacking direction perpendicular to the planar direction, the electrode active material layer including an extended portion having a portion extending in the stacking direction and disposed adjacent to a nearby electrode active material layer in the planar direction.

[0009] The extension portion may extend from one end portion of the electrode active material layer.

[0010] The all-solid-state battery may further include an external electrode connected to the current collector, and the extension portion may be arranged so as to contact the external electrode at one end portion of the electrode active material layer.

[0011] The solid electrolyte layer may have a bent portion bent in the stacking direction along the extending portion of the electrode active material layer.

[0012] The bent portion of the solid electrolyte layer may extend in the stacking direction.

[0013] The bent portion of the solid electrolyte layer may be interposed between the extending portion of the electrode active material layer and the adjacent electrode active material layer in the planar direction.

[0014] In the electrode layer having another electrode active material layer, the electrode active material layer and the other electrode active material layer may be disposed on both surfaces of the current collector, respectively, and the other electrode active material layer may include an extending portion, whereby the extending portions of the electrode active material layer and the other electrode active material layer extend from both sides of the current collector in the stacking direction.

[0015] The solid-state battery may further comprise an external electrode connected to the current collector and an insulating layer interposed between an edge of the current collector and the external electrode.

[0016] The insulating layer may be in contact with the extending portion of the electrode active material layer in the stacking direction.

[0017] The electrode layers may include a first electrode layer and a second electrode layer having different polarities and arranged in the stacking direction with the solid electrolyte layer interposed therebetween, the first electrode layer may include a first current collector and a first active material layer, the second electrode layer may include a second current collector and a second active material layer, and at least one of the first active material layer or the second active material layer may include an extended portion extending in the stacking direction and having a portion disposed adjacent to the first active material layer or the second active material layer in the planar direction.

[0018] The extending portion of the first active material layer or the second active material layer may extend from one end portion of a corresponding one of the first active material layer or the second active material layer.

[0019] The all-solid-state battery may further include a first external electrode connected to the first current collector and a second external electrode connected to the second current collector, and the extended portion of the first active material layer or the second active material layer may be arranged to contact the first external electrode or the second external electrode at the one end portion of a corresponding one of the first active material layer or the second active material layer.

[0020] The first active material layer and the second active material layer may each include an extending portion extending in the stacking direction.

[0021] The all-solid-state battery may further include a first external electrode connected to the first current collector and a second external electrode connected to the second current collector, and the extending portion of the first active material layer may be arranged so as to contact the first external electrode, and the extending portion of the second active material layer may be arranged so as to contact the second external electrode.

[0022] The first active material layer and the second active material layer may be disposed adjacent to each other with the solid electrolyte layer interposed therebetween, and the extending portions of the first active material layer and the second active material layer may extend in opposite directions along the stacking direction.

[0023] The extending portion of the first active material layer and the extending portion of the second active material layer may have different widths along the planar direction.

[0024] The first active material layer and the second active material layer may have different thicknesses along the stacking direction.

[0025] Another embodiment provides an all-solid-state battery comprising: a first electrode layer having a first current collector extending in a planar direction and a first active material layer disposed on at least one surface of the first current collector; a second electrode layer having a polarity different from that of the first electrode layer and extending in the planar direction and a second active material layer disposed on at least one surface of the second current collector; a solid electrolyte layer interposed between the first electrode layer and the second electrode layer; and a first external electrode and a second external electrode connected to the first current collector and the second current collector, respectively, wherein the first active material layer includes a first extension portion having a portion extending from one end portion thereof in a stacking direction perpendicular to the planar direction and disposed so as to contact the first external electrode, and the second active material layer includes a second extension portion having a portion extending from one end portion thereof in the stacking direction and disposed so as to contact the second external electrode.

[0026] The first extension portion may have a portion arranged adjacent to the second active material layer in the planar direction, or the second extension portion may have a portion arranged adjacent to the first active material layer in the planar direction.

[0027] Yet another embodiment provides a method for manufacturing an all-solid-state battery, comprising the steps of: forming a first active material layer on a first current collector extending in a planar direction to form a first electrode layer, whereby the first active material layer has an extended portion extending in a stacking direction perpendicular to the planar direction; forming a second active material layer on a second current collector extending in the planar direction to form a second electrode layer; and stacking the first electrode and the second electrode layers by interposing a solid electrolyte layer between the first and second active material layers facing each other, wherein the extended portion of the first active material layer extends to have a portion disposed adjacent to the second active material layer in the planar direction.

[0028] The second active material layer may include an extending portion that extends in the stacking direction and has a portion that is disposed adjacent to the first active material layer in the planar direction.

[0029] Yet another embodiment provides an all-solid-state battery comprising: a first electrode layer having a first current collector and a first active material layer disposed on at least one surface of the first current collector; a second electrode layer having a second current collector having a polarity different from that of the first electrode layer and a second active material layer disposed on at least one surface of the second current collector; and a solid electrolyte layer interposed between the first electrode layer and the second electrode layer in a stacking direction, wherein at least one of the first active material layer or the second active material layer has a portion overlapping the solid electrolyte layer in a planar direction perpendicular to the stacking direction.

[0030] The first and second active material layers may include first and second extending portions, respectively, each of which protrudes in the stacking direction so as to overlap the solid electrolyte layer in the planar direction.

[0031] The solid electrolyte layer may include a first bent portion and a second bent portion bent in opposite directions along the stacking direction.

[0032] The first bent portion may be arranged between the first extending portion of the first active material layer and the second active material layer in the planar direction, and the second bent portion may be arranged between the second extending portion of the second active material layer and the first active material layer in the planar direction.

[0033] The solid-state battery may further include a first external electrode and a second external electrode connected to the first current collector and the second current collector, respectively. Insulating layers may be disposed between the first external electrode and the second current collector, and between the second external electrode and the first current collector, respectively. Effect of the Invention

[0034] According to one embodiment, the positive or negative electrode active materials that make up an all-solid-state battery can be engineered to achieve improved capacity within a given volume. [Brief description of the drawings]

[0035] [Figure 1] FIG. 1 is a perspective view showing an all-solid-state battery according to one embodiment.

[0036] [Diagram 2] FIG. 2 is a partially exploded perspective view showing a part of the all-solid-state battery shown in FIG.

[0037] [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III' in FIG.

[0038] [Figure 4] FIG. 2 is a cross-sectional view showing an all-solid-state battery according to another embodiment.

[0039] [Diagram 5] FIG. 11 is a cross-sectional view showing an all-solid-state battery according to yet another embodiment.

[0040] [Figure 6] FIG. 11 is a cross-sectional view showing an all-solid-state battery according to yet another embodiment.

[0041] [Figure 7] 2A to 2C are cross-sectional views showing a method for manufacturing the all-solid-state battery shown in FIG.

[0042] [Figure 8] FIG. 2 is an exploded perspective view showing a method for manufacturing the all-solid-state battery shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0043] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present disclosure. In order to clearly describe the present disclosure in the drawings, parts that are not relevant to the description are omitted, and the same or similar components are assigned the same reference numerals throughout the specification. In addition, in the accompanying drawings, some components are exaggerated, omitted, or shown in a schematic manner, and the size of each component does not completely reflect the actual size.

[0044] The accompanying drawings are merely for easy understanding of the embodiments disclosed in this specification, and the technical concepts disclosed in this specification are not limited by the accompanying drawings, and should be understood to include all modifications, equivalents, and alternative forms included within the spirit and scope of this disclosure.

[0045] Terms including ordinal numbers such as first, second, etc. may be used to describe various elements, but these elements are not limited by these terms. The above terms are used merely to distinguish between components.

[0046] Furthermore, when a part, such as a layer, film, region, plate, etc., is described as being "above" or "on" another part, it includes not only the case where it is "immediately on" another part, but also the case where there is another part between them. Conversely, when a part is described as being "directly on" another part, it means that there is no other part between them. In addition, being "above" or "on" a reference part means being located above or below the reference part, and does not necessarily mean being "above" or "on" the opposite direction of gravity.

[0047] Throughout this specification, terms such as "comprise" or "having" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described herein, but this should be understood not to exclude the possible addition or presence of one or more other features or numbers, steps, operations, components, parts, or combinations thereof. Thus, when a part "comprises" a particular component, this does not exclude other components, but means that other components may be further included, unless otherwise stated.

[0048] Additionally, throughout this specification, when reference is made to a "plan view," it means that the target portion is viewed from above, and when reference is made to a "cross section," it means that the cross section obtained by cutting the target portion vertically is viewed from the side.

[0049] Additionally, throughout this specification, when "connected," this does not only mean that two or more components are directly connected, i.e., that two or more components are indirectly connected through other components, electrically and physically connected, or integrated with each other even if referred to by different names according to location or function.

[0050] In the present specification, when describing a stacked type all-solid-state battery, the direction in which the main components of the all-solid-state battery are stacked is defined as the "stacking direction", which may be referred to as the "thickness direction". In addition, the direction parallel to the plane perpendicular to the stacking direction may be defined as the "planar direction", which may include the "longitudinal direction" and the "width direction" which are perpendicular to each other. The longitudinal direction may be the direction in which the positive and negative external electrodes face each other, and the width direction may be the direction perpendicular thereto. In the following drawings, the x-axis direction corresponds to the longitudinal direction, the y-axis direction corresponds to the width direction, and the z-axis direction corresponds to the stacking direction.

[0051] FIG. 1 is a perspective view showing an all-solid-state battery 100 according to one embodiment, FIG. 2 is a partially exploded perspective view showing a portion of the all-solid-state battery 100 shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III′ in FIG. 1.

[0052] 1 to 3, the all-solid-state battery 100 according to this embodiment includes electrode layers 120 and 140, and solid electrolyte layers 132 and 134 disposed adjacent to the electrode layers 120 and 140 in the stacking direction (z-axis direction in the drawings).

[0053] The electrode layers 120 and 140 may each essentially have current collectors 121 and 141 extending in a planar direction (the xy plane direction in the drawing), and electrode active material layers 123, 125, 143, and 145 coated on at least one surface of the current collectors 121 and 141.

[0054] The electrode active material layers 123, 125, 143, and 145 may include extending portions 124, 126, 144, and 146 extending in the stacking direction. The extending portions 124, 126, 144, and 146 may have portions disposed adjacent to other electrode active material layers in the stacking direction in the planar direction. In other words, such extending portions 124, 126, 144, and 146 of the electrode active material layers 123, 125, 143, and 145 may overlap other adjacent electrode active material layers in the planar direction. The extending portions 124, 126, 144, and 146 may be formed to extend from one end portion of each of the electrode active material layers 123, 125, 143, and 145. In this case, the solid electrolyte layers 132 and 134 may include bent portions 132a, 132b, 134a, and 134b that are bent in the stacking direction along the extending portions 124, 126, 144, and 146 of the electrode active material layers 123, 125, 143, and 145, respectively. That is, the extending portions 124, 126, 144, and 146 may extend upward or downward in the stacking direction from one end portion along the longitudinal direction (x-axis direction in the drawing) of the electrode active material layers 123, 125, 143, and 145, and the bent portions 132a, 132b, 134a, and 134b may extend upward and downward in the stacking direction at both end portions in the longitudinal direction of the solid electrolyte layers 132 and 134.

[0055] Therefore, the extending portions 124 and 126 of the electrode active material layers 123 and 125 may be disposed to face other adjacent electrode active material layers 143 and 145 with the bent portions 132a and 134a of the solid electrolyte layers 132 and 134 interposed therebetween. In other words, such extending portions 124 and 126 of the electrode active material layers 123 and 125 may overlap the bent portions 132a and 134a of the solid electrolyte layers 132 and 134, respectively, in the planar direction. When the electrode active material layers 123, 125, 143, and 145 are disposed on both surfaces of the current collectors 121 and 141 in the electrode layers 120 and 140, the extending portions 124, 126, 144, and 146 of the electrode active material layers 123, 125, 143, and 145 may extend to both sides of the current collectors 121 and 141 in the stacking direction.

[0056] In this embodiment, the electrode layers 120 and 140 may include a positive electrode layer 120 and a negative electrode layer 140, and the solid electrolyte layers 132 and 134 may be laminated so as to be interposed between the positive electrode layer 120 and the negative electrode layer 140. The solid electrolyte layers 132 and 134 may include a solidified electrolyte and function as a medium for transferring ions between the positive electrode layer 120 and the negative electrode layer 140.

[0057] The positive electrode layer 120 may be made by coating the positive electrode active material layers 123 and 125 on at least one surface of the positive electrode current collector 121, and the negative electrode layer 140 may be made by coating the negative electrode active material layers 143 and 145 on at least one surface of the negative electrode current collector 141. For example, the negative electrode layer 140 located at the top in the stacking direction may be formed by coating the negative electrode active material layer 143 on one surface (lower surface) of the negative electrode current collector 141, and the positive electrode layer 120 located at the bottom may be formed by coating the positive electrode active material layer 123 on one surface (upper surface) of the positive electrode current collector 121. Furthermore, in the electrode layers located between the top and bottom, the positive electrode layer 120 may be formed by coating positive electrode active material layers 123 and 125 on both surfaces of a positive electrode current collector 121, or the negative electrode layer 140 may be formed by coating negative electrode active material layers 143 and 145 on both surfaces of a negative electrode current collector 141.

[0058] The solid electrolyte layers 132 and 134 may be disposed between the positive electrode active material layers 123 and 125 of the positive electrode layer 120 and the negative electrode active material layers 143 and 145 of the negative electrode layer 140, respectively, in the stacking direction. Thus, in the all-solid-state battery 100, a plurality of positive electrode layers 120 and a plurality of negative electrode layers 140 may be disposed alternatively, and a plurality of solid electrolyte layers 132 and 134 may be interposed between them so as to be stacked. As an example, the solid electrolyte layers 132 and 134 may be formed by stacking an LATP electrolyte (Li 1+x Al x Ti 2-x(PO4)3 (0≦x≦0.6)) may be used. As another example, the Nasicon series (Li 1+x Al x M 2-x A (PO4)3) electrolyte or an amorphous (glass) electrolyte may be used for the solid electrolyte layers 132 and 134, as yet another example, a garnet-type material (Li 7+x-y La 3-x (M1) x Zr 2-y (M2) y O 12 ) (where M1 = +2-valent element (e.g. Ba) and M2 = +5-valent element (e.g. Ta)), LiPON (Li 2.9 PO 3.3 N 0.46 ), or perovskite structure materials (La 0.51 Li 0.34 TiO 2.94 ) may be used as the solid electrolyte layers 132 and 134.

[0059] In this embodiment, the positive electrode active material layers 123 and 125 and the negative electrode active material layers 143 and 145 may include extension portions 124, 126, 144, and 146 extending in the stacking direction, respectively. That is, the extension portions 124, 126, 144, and 146 include the positive electrode active material extension portions 124 and 126 and the negative electrode active material extension portions 144 and 146, and the positive electrode active material extension portions 124 and 126 may extend from the positive electrode active material layers 123 and 125, respectively, and the negative electrode active material extension portions 144 and 146 may extend from the negative electrode active material layers 143 and 145, respectively. The positive electrode active material extension portions 124 and 126 may each have a portion arranged adjacent to the negative electrode active material layers 143 and 145 in the planar direction, and the negative electrode active material extension portions 144 and 146 may each have a portion arranged adjacent to the positive electrode active material layers 123 and 125 in the planar direction.

[0060] The positive electrode active material extension portions 124 and 126 and the negative electrode active material extension portions 144 and 146 may extend in the stacking direction from one end portion of the positive electrode active material layers 123 and 125 and the negative electrode active material layers 143 and 145, respectively. Since the positive electrode active material layers 123 and 125 are disposed on both surfaces of the positive electrode current collector 121 in the positive electrode layer 120, the positive electrode active material extension portions 124 and 126 may extend to both sides of the positive electrode current collector 121 in the stacking direction. Since the negative electrode active material layers 143 and 145 are disposed on both surfaces of the negative electrode current collector 141 in the negative electrode layer 140, the negative electrode active material extension portions 144 and 146 may extend to both sides of the negative electrode current collector 141 in the stacking direction.

[0061] The positive electrode active material layers 123 and 125 and the negative electrode active material layers 143 and 145 may be disposed adjacent to each other in the stacking direction with the solid electrolyte layers 132 and 134 interposed therebetween. In this case, the positive electrode active material extension portions 124 and 126 may be formed on one end portion of the positive electrode active material layers 123 and 125 located opposite to one end portion of the negative electrode active material layers 143 and 145, and the negative electrode active material extension portions 144 and 146 may be formed on the negative electrode active material layers 143 and 145 and may extend in the opposite direction along the stacking direction.

[0062] In addition, the positive electrode active material extension portions 124 and 126 may be arranged to face the negative electrode active material layers 143 and 145 in the planar direction with the bent portions 132a and 134a of the solid electrolyte layers 132 and 134 interposed therebetween, and the negative electrode active material extension portions 144 and 146 may be arranged to face the positive electrode active material layers 123 and 125 in the planar direction with the bent portions 132b and 134b of the solid electrolyte layers 132 and 134 interposed therebetween. Thus, one side of the solid electrolyte layers 132 and 134 may extend so as to be bent upward along the stacking direction to form the bent portions 132a and 134b, and the other side of the solid electrolyte layers 132 and 134 may extend so as to be bent downward along the stacking direction to form the bent portions 132b and 134a.

[0063] The positive electrode layer 120, the solid electrolyte layers 132 and 134, and the negative electrode layer 140 may be laminated as described above to configure the battery stack of the all-solid-state battery 100. An outer insulating layer 131 covering the negative electrode current collector 141 and the positive electrode active material extension portion 124 may be formed in the uppermost portion of the battery stack of the all-solid-state battery 100, and an outer insulating layer 137 covering the positive electrode current collector 121 and the negative electrode active material extension portion 146 may be formed in the lowermost portion. In addition, protective layers 161 and 163 made of insulating materials are additionally formed on the outside of these outer insulating layers 131 and 137 to ensure ion leakage prevention and insulation performance.

[0064] The terminal of the positive electrode current collector 121 and the terminal of the negative electrode current collector 141 may be exposed on the surfaces of both sides of the battery stack of the all-solid-state battery 100, and the external electrodes 152 and 154 may be connected and bonded to the exposed terminals. That is, the external electrodes 152 and 154 include a positive external electrode 152 having a negative polarity and connected to the terminal of the positive electrode current collector 121, and a negative external electrode 154 having a positive polarity and connected to the terminal of the negative electrode current collector 141. When the terminal of the positive electrode current collector 121 and the terminal of the negative electrode current collector 141 are configured to face each other in opposite directions, the external electrodes 152 and 154 may be located on both sides, respectively.

[0065] The insulating layers 133 and 135 may be respectively interposed between one edge of the positive electrode current collector 121 and the negative external electrode 154, and between the other edge of the negative electrode current collector 141 and the positive external electrode 152. The insulating layers 133 and 135 may be in contact with the positive electrode active material extension portions 124 and 126 in the stacking direction, or may be in contact with the negative electrode active material extension portions 144 and 146 in the stacking direction.

[0066] The positive electrode active material extension portions 124 and 126 may extend from the positive electrode active material layers 123 and 125 at one end portion where the positive electrode current collector 121 contacts the positive external electrode 152, and the negative electrode active material extension portions 144 and 146 may extend from the negative electrode active material layers 143 and 145 at one end portion where the negative electrode current collector 141 contacts the negative external electrode 154. Accordingly, the positive electrode active material extension portions 124 and 126 may be arranged to contact the positive external electrode 152, and the negative electrode active material extension portions 144 and 146 may be arranged to contact the negative external electrode 154.

[0067] FIG. 4 is a cross-sectional view showing an all-solid-state battery 200 according to another embodiment.

[0068] With reference to FIG. 4, the all-solid-state battery 200 according to this embodiment may be configured to include the basic configuration of the all-solid-state battery 100 described with reference to FIGS. 1 to 3.

[0069] That is, the all-solid-state battery 200 includes electrode layers 220 and 240, and solid electrolyte layers 232 and 234 disposed adjacent to the electrode layers 220 and 240 in the stacking direction (z-axis direction in the drawing). The electrode layers 220 and 240 may basically have current collectors 221 and 241 extending in a planar direction (xy planar direction in the drawing), and electrode active material layers 223, 225, 243, and 245 coated on at least one surface of the current collectors 221 and 241.

[0070] The electrode active material layers 223, 225, 243, and 245 may include extension portions 224, 226, 244, and 246, which extend from one end portion thereof in the stacking direction and have portions disposed adjacent to other nearby electrode active material layers 223, 225, 243, and 245, respectively, in the planar direction. In this case, the solid electrolyte layers 232 and 234 may include bent portions 232a, 232b, 234a, and 234b that are bent in the stacking direction along the extension portions 224, 226, 244, and 246 of the electrode active material layers 223, 225, 243, and 245.

[0071] The electrode layers 220 and 240 may include a positive electrode layer 220 and a negative electrode layer 240, and the solid electrolyte layers 232 and 234 may be stacked so as to be interposed between the positive electrode layer 220 and the negative electrode layer 240. The positive electrode layer 220 may be fabricated by coating positive electrode active material layers 223 and 225 on at least one surface of a positive electrode current collector 221, and the negative electrode layer 240 may be fabricated by coating negative electrode active material layers 243 and 245 on at least one surface of a negative electrode current collector 241. In this case, the positive electrode active material layers 223 and 225 may include positive electrode active material extension portions 224 and 226 extending from the positive electrode current collector 221 in the stacking direction, and the negative electrode active material layers 243 and 245 may include negative electrode active material extension portions 244 and 246 extending from the negative electrode current collector 241 in the stacking direction. The positive electrode active material extension portions 224 and 226 may each have a portion arranged adjacent to the negative electrode active material layers 243 and 245 in the planar direction, and the negative electrode active material extension portions 244 and 246 may each have a portion arranged adjacent to the positive electrode active material layers 223 and 225 in the planar direction.

[0072] The insulating layers 233 and 235 may be interposed between one edge of the positive electrode current collector 221 and the negative external electrode 154, and between the other edge of the negative electrode current collector 241 and the positive external electrode 152, respectively. The insulating layers 233 and 235 may be in contact with the positive electrode active material extension portions 224 and 226 in the stacking direction, or may be in contact with the negative electrode active material extension portions 244 and 246 in the stacking direction.

[0073] In this embodiment, the positive electrode active material layers 223 and 225 and the negative electrode active material layers 243 and 245 may have different thicknesses t1 and t2 according to the stacking direction. When there is a difference in the properties per unit volume of the components constituting the positive electrode active material and the components constituting the negative electrode active material, the performance may be balanced by increasing or decreasing the volume of one of the active materials. For example, the thickness t1 of each of the positive electrode active material layers 223 and 225 may be thicker than the thickness t2 of each of the negative electrode active material layers 243 and 245. That is, the capacity per weight of the negative electrode active material and the positive electrode active material is different, and the thickness can be changed so that the capacity of the negative electrode and the positive electrode is equal at the time of design.

[0074] FIG. 5 is a cross-sectional view showing an all-solid-state battery 300 according to yet another embodiment.

[0075] With reference to FIG. 5, an all-solid-state battery 300 according to this embodiment may be configured to include the basic configuration of the all-solid-state battery 100 described with reference to FIGS. 1 to 3.

[0076] That is, the all-solid-state battery 300 includes electrode layers 320 and 340, and solid electrolyte layers 232 and 234 arranged adjacent to the electrode layers 320 and 340 in the stacking direction (z-axis direction in the drawing). The electrode layers 320 and 340 may basically have current collectors 321 and 341 extending in a planar direction (xy planar direction in the drawing), and electrode active material layers 323, 325, 343, and 345 coated on at least one surface of the current collectors 321 and 341. The solid electrolyte layers 332 and 334 may be arranged adjacent to the electrode layers 320 and 340 in the stacking direction.

[0077] The electrode layers 320 and 340 may include a positive electrode layer 320 and a negative electrode layer 340, and the solid electrolyte layers 332 and 334 may be laminated so as to be interposed between the positive electrode layer 320 and the negative electrode layer 340. The positive electrode layer 320 may be made by coating positive electrode active material layers 323 and 325 on at least one surface of a positive electrode current collector 321, and the negative electrode layer 340 may be made by coating negative electrode active material layers 343 and 345 on at least one surface of a negative electrode current collector 341.

[0078] In this embodiment, the positive electrode active material layers 323 and 325 may include positive electrode active material extension portions 324 and 326 extending in the stacking direction from one end portion thereof, while the negative electrode active material layers 343 and 345 do not include an extension portion. The positive electrode active material extension portions 324 and 326 may each have a portion disposed adjacent to the negative electrode active material layers 343 and 345 in the planar direction. The solid electrolyte layers 332 and 334 may include bent portions 332a and 334a bent in the stacking direction along the positive electrode active material extension portions 324 and 326, respectively.

[0079] The insulating layers 333 and 335 may be interposed between one edge of the positive electrode current collector 321 and the negative external electrode 154, and between the other edge of the negative electrode current collector 341 and the positive external electrode 152, respectively. The insulating layers 333 and 335 may be in contact with the positive electrode active material extension portions 324 and 326, or in contact with the solid electrolyte layers 332 and 334 in the stacking direction. In this case, the insulating layer 333 in contact with the solid electrolyte layers 332 and 334 may be formed to be thicker in the stacking direction than the insulating layer 335 in contact with the positive electrode active material extension portions 324 and 326.

[0080] FIG. 6 is a cross-sectional view showing an all-solid-state battery 400 according to yet another embodiment.

[0081] Referring to FIG. 6, an all-solid-state battery 400 according to this embodiment may be configured to include the basic configuration of the all-solid-state battery 100 similarly described with reference to FIGS. 1 to 3.

[0082] That is, the all-solid-state battery 400 includes electrode layers 420 and 440, and solid electrolyte layers 432 and 434 disposed adjacent to the electrode layers 420 and 440 in the stacking direction (z-axis direction in the drawing). The electrode layers 420 and 440 may basically have current collectors 421 and 441 extending in a planar direction (xy planar direction in the drawing), and electrode active material layers 423, 425, 443, and 445 coated on at least one surface of the current collectors 421 and 441.

[0083] The electrode active material layers 423, 425, 443, and 445 may include extension portions 424, 426, 444, and 446, which extend from one end portion thereof in the stacking direction and have portions disposed adjacent to other nearby electrode active material layers 423, 425, 443, and 445 in the planar direction. In this case, the solid electrolyte layers 432 and 434 may include bent portions 432a, 432b, 434a, and 434b that are bent in the stacking direction along the extension portions 424, 426, 444, and 446 of the electrode active material layers 423, 425, 443, and 445.

[0084] The electrode layers 420 and 440 may include a positive electrode layer 420 and a negative electrode layer 440, and the solid electrolyte layers 432 and 434 may be stacked so as to be interposed between the positive electrode layer 420 and the negative electrode layer 440. The positive electrode layer 420 may be fabricated by coating positive electrode active material layers 423 and 425 on at least one surface of a positive electrode current collector 421, and the negative electrode layer 440 may be fabricated by coating negative electrode active material layers 443 and 445 on at least one surface of a negative electrode current collector 441. In this case, the positive electrode active material layers 423 and 425 may include positive electrode active material extension portions 424 and 426, respectively, extending from the positive electrode current collector 421 in the stacking direction, and the negative electrode active material layers 443 and 445 may include negative electrode active material extension portions 444 and 446, respectively, extending from the negative electrode current collector 441 in the stacking direction. The positive electrode active material extension portions 424 and 426 may each have a portion arranged adjacent to the negative electrode active material layers 443 and 445 in the planar direction, and the negative electrode active material extension portions 444 and 446 may each have a portion arranged adjacent to the positive electrode active material layers 423 and 425 in the planar direction.

[0085] In this embodiment, the positive electrode active material extensions 424 and 426 and the negative electrode active material extensions 444 and 446 may have different widths w1 and w2 in the longitudinal direction (x-axis direction in the drawing). That is, when there is a difference in the properties per unit volume of the components constituting the positive electrode active material and the components constituting the negative electrode active material, the performance may be balanced by increasing or decreasing the volume of one of the active materials. For example, the width w1 of each of the positive electrode active material extensions 424 and 426 may be wider than the width w2 of the negative electrode active material extensions 444 and 446. Accordingly, it is easier to balance the positive and negative electrode capacities when applying the printing process.

[0086] 7 and 8 are cross-sectional and exploded perspective views showing a method for manufacturing the all-solid-state battery shown in Fig. 1. Fig. 8 shows a schematic printing sequence of an electrode unit including a positive electrode layer 120 and a negative electrode layer 140 positioned at the bottom of the structure of the all-solid-state battery 100 shown in Fig. 7.

[0087] 7 and 8, in the manufacturing method of the all-solid-state battery 100 according to the present embodiment, the all-solid-state battery may be manufactured by sequentially stacking the components of the electrode layers 120 and 140 on the protective layer 163 and the outer insulating layer 137 using a printing process.

[0088] First, the protective layer 163 may be provided and the outer insulating layer 137 may be laminated thereon. In this case, the outer insulating layer 137 may be formed separately from the protective layer 163. As another example, the outer insulating layer 137 may be integrally made from the same material as the protective layer 163.

[0089] Next, the positive electrode current collector 121 may be laminated on the outer insulating layer 137. In this case, the insulating layer 135 may be formed adjacent to one end portion of the positive electrode current collector 121, and the positive electrode current collector 121 and the insulating layer 135 may be formed to have the same thickness along the stacking direction (z-axis direction in the drawings).

[0090] The insulating layer 135 may be made from the same material as the outer insulating layer 137, and when the insulating layer 135 is formed from the same material on the outer insulating layer 137, it may be integrally formed.

[0091] The positive electrode active material layer 123 may then be laminated onto the positive electrode current collector 121 , and the bent portion 132 b of the solid electrolyte layer 132 and the negative electrode active material extension portion 146 may be laminated onto the insulating layer 135 .

[0092] The positive electrode active material layer 123 may be formed to have a size equal to the area of ​​the positive electrode current collector 121, and the bent portion 132b of the solid electrolyte layer 132 and the negative electrode active material extension portion 146 are adjacent to one end portion of the positive electrode active material layer 123. That is, the bent portion 132b of the solid electrolyte layer 132 separates the positive electrode active material layer 123 and the negative electrode active material extension portion 146.

[0093] Next, the solid electrolyte layer 132 and the positive electrode active material extension portion 124 may be stacked on the positive electrode active material layer 123, and the negative electrode active material extension portion 146 may be further stacked in the stacking direction. The positive electrode active material extension portion 124 and the negative electrode active material extension portion 146 may be disposed on both ends of the solid electrolyte layer 132, respectively, and the solid electrolyte layer 132 may be formed so as to be integrally connected to the bent portion 132b of the solid electrolyte layer 132.

[0094] Next, the negative electrode active material layer 145 may be laminated on the solid electrolyte layer 132 and the negative electrode active material extension portion 146. In addition, the bent portion 132a of the solid electrolyte layer 132 may be formed on the positive electrode side end portion of the solid electrolyte layer 132, and may be further laminated on the positive electrode active material extension portion 126 so as to expand in the lamination direction.

[0095] Through this process, the positive electrode active material layer 123 may have an extension portion 124 extending in the stacking direction, and the negative electrode active material layer 145 may have an extension portion 146 extending in the stacking direction. In this case, the positive electrode active material extension portion 124 may have a portion disposed adjacent to the negative electrode active material layer 145 in the planar direction, and the negative electrode active material extension portion 146 may have a portion disposed adjacent to the positive electrode active material layer 123 in the planar direction. In addition, the solid electrolyte layer 132 may be interposed between the positive electrode active material layer 123 and the negative electrode active material layer 145.

[0096] Next, the negative electrode current collector 141 may be laminated on the negative electrode active material layer 145, and the insulating layer 135 may be disposed on the positive electrode active material extension portion 124 and the bent portion 132a of the solid electrolyte layer 132. The negative electrode current collector 141 may be formed to have a size equal to the area of ​​the negative electrode active material layer 145.

[0097] Next, the negative electrode active material layer 143 may be laminated onto the negative electrode current collector 141 , and the positive electrode active material extension portion 126 and the bent portion 134 a of the solid electrolyte layer 134 may be disposed on the insulating layer 135 .

[0098] The negative electrode active material layer 143 may be formed to have a size equal to the area of ​​the negative electrode current collector 141, and the bent portion 134a of the solid electrolyte layer 134 and the positive electrode active material extension portion 126 are adjacent to one end portion of the negative electrode active material layer 143. That is, the bent portion 134a of the solid electrolyte layer 134 separates the negative electrode active material layer 143 and the positive electrode active material extension portion 126.

[0099] Next, the solid electrolyte layer 134 may be stacked on the negative electrode active material layer 143, and the solid electrolyte layer 134 may be arranged so as to be connected to the bent portion 134a. In addition, the positive electrode active material extension portion 126 may be further stacked so as to extend upward in the stacking direction, and the negative electrode active material extension portion 144 may be stacked on the negative electrode active material layer 143 at the negative electrode side end portion.

[0100] Next, the positive electrode active material layer 125 may be laminated on the solid electrolyte layer 134 and the positive electrode active material extension portion 126, and may further be laminated on the negative electrode active material extension portion 144 so as to expand in the lamination direction. Moreover, the bent portion 134b may extend upward from the positive electrode side end portion of the solid electrolyte layer 134.

[0101] Through the above process, the electrode layers 120 and 140 and the solid electrolyte layers 132 and 134 may be formed on the protective layer 163 and the outer insulating layer 137, and the stacking of the electrode layers 120 and 140 and the solid electrolyte layers 132 and 134 may be repeated to form a battery stack of the all-solid-state battery 100. In addition, the outer insulating layer 131 and the protective layer 161 may be stacked to cover the negative electrode current collector 141 located at the top of the battery stack of the all-solid-state battery 100.

[0102] External electrodes 152 and 154 may then be bonded and connected to both surfaces of the battery stack of the all-solid-state battery 100.

[0103] Although the manufacturing method of the all-solid-state battery shown in FIG. 1 has been described above, the all-solid-state battery shown in FIGS. 4 to 6 can also be manufactured in the same manner by applying necessary modifications.

[0104] Although preferred embodiments have been described above, it goes without saying that the disclosure is not limited thereto, and various modifications can be made within the scope of the claims, the disclosure, and the accompanying drawings, and these modifications also fall within the scope of the disclosure. [Explanation of symbols]

[0105] 100, 200, 300, 400: All-solid-state battery 120, 140: Electrode layer (positive electrode layer, negative electrode layer) 121, 141: Current collector (positive electrode current collector, negative electrode current collector) 123, 125: Positive electrode active material layer 124, 126: (Positive electrode active material) extension part 143, 145: Negative electrode active material layer 144, 146: (Negative electrode active material) extension part 132, 134: Solid electrolyte layer 132a, 132b, 134a, 134b: (solid electrolyte layer) bent part 131, 137: Outer insulation layer 133, 135: insulating layer 152, 154: external electrodes (positive external electrode, negative external electrode) 161, 163: Protective layer

Claims

1. an electrode layer having a current collector extending in a planar direction and an electrode active material layer disposed on at least one surface of the current collector; and a solid electrolyte layer disposed adjacent to the electrode layer in a stacking direction perpendicular to the planar direction; the electrode active material layer includes an extending portion that extends in the stacking direction and has a portion that is disposed adjacent to an adjacent electrode active material layer in the planar direction.

2. The all-solid-state battery according to claim 1 , wherein the extending portion extends from one end portion of the electrode active material layer.

3. 2. The all-solid-state battery according to claim 1, further comprising an external electrode connected to the current collector, the extension portion being arranged so as to contact the external electrode at one end portion of the electrode active material layer.

4. The all-solid-state battery according to claim 1 , wherein the solid electrolyte layer has a bent portion bent in the stacking direction along the extending portion of the electrode active material layer.

5. The all-solid-state battery according to claim 4 , wherein the bent portion of the solid electrolyte layer extends in the stacking direction.

6. 5. The all-solid-state battery according to claim 4, wherein the bent portion of the solid electrolyte layer is interposed between the extending portion of the electrode active material layer and the adjacent electrode active material layer in the planar direction.

7. In the electrode layer having another electrode active material layer, the electrode active material layer and the other electrode active material layer are respectively disposed on both surfaces of the current collector; the other electrode active material layer includes an extending portion, whereby the extending portions of the electrode active material layer and the other electrode active material layer extend from both sides of the current collector in the stacking direction; The all-solid-state battery according to claim 1 .

8. an external electrode connected to the current collector; and an insulating layer interposed between the edge of the current collector and the external electrode; The all-solid-state battery of claim 1 , further comprising:

9. The all-solid-state battery according to claim 8 , wherein the insulating layer is in contact with the extending portion of the electrode active material layer in the stacking direction.

10. the electrode layers include a first electrode layer and a second electrode layer having different polarities and arranged in the stacking direction with the solid electrolyte layer interposed therebetween; the first electrode layer includes a first current collector and a first active material layer, and the second electrode layer includes a second current collector and a second active material layer; At least one of the first active material layer or the second active material layer includes an extending portion extending in the stacking direction and having a portion disposed adjacent to the first active material layer or the second active material layer in the planar direction. The all-solid-state battery according to claim 1 .

11. 11. The all-solid-state battery according to claim 10, wherein the extending portion of the first active material layer or the second active material layer extends from one end portion of a corresponding one of the first active material layer or the second active material layer.

12. 12. The all-solid-state battery according to claim 11, further comprising a first external electrode connected to the first current collector and a second external electrode connected to the second current collector, wherein the extended portion of the first active material layer or the second active material layer is arranged to contact the first external electrode or the second external electrode at the one end portion of a corresponding one of the first active material layer or the second active material layer.

13. The all-solid-state battery according to claim 10 , wherein the first active material layer and the second active material layer each include an extending portion extending in the stacking direction.

14. 14. The all-solid-state battery according to claim 13, further comprising a first external electrode connected to the first current collector and a second external electrode connected to the second current collector, wherein the extending portion of the first active material layer is arranged to contact the first external electrode and the extending portion of the second active material layer is arranged to contact the second external electrode.

15. 14. The all-solid-state battery according to claim 13, wherein the first active material layer and the second active material layer are disposed adjacent to each other with the solid electrolyte layer interposed therebetween, and the extending portions of the first active material layer and the second active material layer extend in opposite directions along the stacking direction.

16. The all-solid-state battery according to claim 13 , wherein the extending portion of the first active material layer and the extending portion of the second active material layer have different widths along the planar direction.

17. The all-solid-state battery according to claim 10 , wherein the first active material layer and the second active material layer have different thicknesses along the stacking direction.

18. a first electrode layer having a first current collector extending in a planar direction and a first active material layer disposed on at least one surface of the first current collector; a second electrode layer extending in the planar direction and including a second current collector having a polarity different from that of the first electrode layer and a second active material layer disposed on at least one surface of the second current collector; a solid electrolyte layer interposed between the first electrode layer and the second electrode layer; and a first external electrode and a second external electrode connected to the first current collector and the second current collector, respectively; the first active material layer includes a first extending portion extending from one end portion thereof in a stacking direction perpendicular to the planar direction and having a portion disposed so as to contact the first external electrode, and the second active material layer includes a second extending portion extending from one end portion thereof in the stacking direction and having a portion disposed so as to contact the second external electrode.

19. the first extending portion has a portion disposed adjacent to the second active material layer in the planar direction; or The all-solid-state battery according to claim 18 , wherein the second extending portion has a portion disposed adjacent to the first active material layer in the planar direction.

20. forming a first active material layer on a first current collector extending in a planar direction to form a first electrode layer, wherein the first active material layer has an extending portion extending in a stacking direction perpendicular to the planar direction; forming a second active material layer on the second current collector extending in the planar direction to form a second electrode layer; and laminating the first electrode layer and the second electrode layer by interposing a solid electrolyte layer between the first active material layer and the second active material layer facing each other; the extending portion of the first active material layer extends to have a portion disposed adjacent to the second active material layer in the planar direction; How solid-state batteries are manufactured.

21. The method according to claim 20 , wherein the second active material layer includes an extending portion that extends in the stacking direction and has a portion that is disposed adjacent to the first active material layer in the planar direction.

22. a first electrode layer having a first current collector and a first active material layer disposed on at least one surface of the first current collector; a second electrode layer having a second current collector having a polarity different from that of the first electrode layer and a second active material layer disposed on at least one surface of the second current collector; and a solid electrolyte layer interposed between the first electrode layer and the second electrode layer in the stacking direction; at least one of the first active material layer or the second active material layer has a portion that overlaps the solid electrolyte layer in a longitudinal direction perpendicular to the stacking direction.

23. 23. The all-solid-state battery according to claim 22, wherein the first active material layer and the second active material layer include a first extension portion and a second extension portion, respectively, each of which protrudes in the stacking direction so as to overlap the solid electrolyte layer in the longitudinal direction.

24. The all-solid-state battery according to claim 23 , wherein the solid electrolyte layer includes a first bent portion and a second bent portion bent in opposite directions along the stacking direction.

25. the first bent portion is disposed between the first extending portion of the first active material layer and the second active material layer in the longitudinal direction, 25. The all-solid-state battery according to claim 24, wherein the second bent portion is disposed between the second extending portion of the second active material layer and the first active material layer in the longitudinal direction.

26. 24. The all-solid-state battery of claim 23, further comprising a first external electrode and a second external electrode connected to the first current collector and the second current collector, respectively, and wherein an insulating layer is disposed between the first external electrode and the second current collector, and between the second external electrode and the first current collector, respectively.

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