All-solid-state batteries

Abstract

To provide an all-solid battery.SOLUTION: An all-solid battery comprises: a battery body including an electrode assembly having first and second faces opposed to each other in a first direction, third and fourth faces opposed to each other in a second direction, and fifth and sixth faces opposed to each other in a third direction, and including a solid electrolyte, and positive and negative electrodes which are laminated in the third direction with the solid electrolyte therebetween, and a first margin part disposed on the third face of the electrode assembly, and a second margin part disposed on the fourth face of the electrode assembly; a first joint disposed on the first face of the electrode assembly; and a second joint disposed on the second face of the electrode assembly. The first joint includes a first current collector electrode joined to the positive electrode, and a first protection section disposed on the first current collector electrode. The second joint includes a second current collector electrode joined to the negative electrode, and a second protection section disposed on the second current collector electrode. The first and second current collector electrodes are led out to one of the faces in the third direction of the first joint and the second joint.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an all-solid-state battery. [Background technology]

[0002] In recent years, the number of devices that use electricity as an energy source has increased. The range of applications using electricity, such as smartphones, camcorders, laptops, and electric vehicles, is expanding, and as a result, interest in electric storage devices using electrochemical elements is growing. Among the various electrochemical elements, lithium secondary batteries have been attracting attention due to their ability to be charged and discharged, their high operating voltage, and their extremely high energy density.

[0003] Lithium secondary batteries are manufactured by applying a material capable of inserting and extracting lithium ions to a positive electrode and a negative electrode and injecting a liquid electrolyte between the positive and negative electrodes. Electricity is generated or consumed by an oxidation-reduction reaction caused by the insertion and extraction of lithium ions at the negative and positive electrodes. Such lithium secondary batteries are basically required to be stable within the operating voltage range of the battery and to have the ability to transfer ions at a sufficiently fast rate.

[0004] The use of a liquid electrolyte such as a non-aqueous electrolyte in such a lithium secondary battery has the advantage of high discharge capacity and energy density, but it is difficult to achieve high voltages with the lithium secondary battery, and there are problems such as high risks of electrolyte leakage, fire, and explosion.

[0005] To address these issues, secondary batteries that use solid electrolytes instead of liquid electrolytes have been proposed as an alternative. Solid electrolytes are classified into polymer-based solid electrolytes and ceramic-based solid electrolytes, with ceramic-based solid electrolytes being particularly advantageous in terms of their high stability. However, ceramic-based solid electrolytes have problems such as reduced ionic conductivity and reduced charge / discharge efficiency due to poor interfacial contact and side reactions between the electrolyte and electrodes. Summary of the Invention [Problem to be solved by the invention]

[0006] One of various objects of the present invention is to provide an all-solid-state battery with excellent moisture resistance reliability.

[0007] One of the various objects of the present invention is to provide an all-solid-state battery that can simplify the production process.

[0008] One of the various objects of the present invention is to provide an all-solid-state battery that can be miniaturized. [Means for solving the problem]

[0009] One embodiment of the present invention relates to a battery body including an electrode assembly having first and second surfaces facing each other in a first direction, third and fourth surfaces facing each other in the second direction, and fifth and sixth surfaces facing each other in the third direction, the electrode assembly including a solid electrolyte layer and a positive electrode and a negative electrode stacked in the third direction with the solid electrolyte layer sandwiched therebetween; a first margin portion disposed on the third surface of the electrode assembly; and a second margin portion disposed on the fourth surface of the electrode assembly; a first connecting portion disposed on the first surface of the electrode assembly; and a second connecting part disposed on a second surface of the assembly, wherein the first connecting part includes a first current collecting electrode connected to the positive electrode and a first protective part disposed on the first current collecting electrode, and the second connecting part includes a second current collecting electrode connected to the negative electrode and a second protective part disposed on the second current collecting electrode, and the first current collecting electrode and the second current collecting electrode are drawn out to either one surface in a third direction of the first connecting part and the second connecting part.

[0010] Another embodiment of the present invention provides a battery body including an electrode assembly having first and second surfaces facing in a first direction, third and fourth surfaces facing in the second direction, and fifth and sixth surfaces facing in the third direction, the electrode assembly including a dielectric layer and a positive electrode and a negative electrode stacked in the second direction with the dielectric layer sandwiched therebetween; a first margin portion disposed on the third surface of the electrode assembly; and a second margin portion disposed on the fourth surface of the electrode assembly; a first connecting portion disposed on the first surface of the electrode assembly; and a second connecting part disposed on a second surface of a solid body, wherein the first connecting part includes a first current collecting electrode connected to the positive electrode and a first protective part disposed on the first current collecting electrode, and the second connecting part includes a second current collecting electrode connected to the negative electrode and a second protective part disposed on the second current collecting electrode, and the first current collecting electrode and the second current collecting electrode are drawn out to either one surface in a third direction of the first connecting part and the second connecting part. [Effects of the Invention]

[0011] One of the various effects of the present invention is that it is possible to provide an all-solid-state battery with excellent moisture resistance reliability.

[0012] One of the various effects of the present invention is that it is possible to provide an all-solid-state battery that can simplify the production process and increase the process efficiency.

[0013] One of the various effects of the present invention is that it is possible to provide an all-solid-state battery that allows for product miniaturization.

[0014] However, the various beneficial advantages and effects of the present invention are not limited to the above, and can be more easily understood in the course of describing specific embodiments of the present invention. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view schematically illustrating an all-solid-state battery according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along II' in FIG. [Figure 3] FIG. 3 is an enlarged view of region A in FIG. 2. [Figure 4] FIG. 2 is a perspective view schematically showing the battery body of FIG. [Figure 5] FIG. 5 is a perspective view schematically illustrating the electrode assembly of FIG. [Figure 6] FIG. 5 is a front view of FIG. 4 as seen from the X direction. [Figure 7] FIG. 2 is a diagram showing the inside of the first connecting portion of FIG. 1. [Figure 8] FIG. 1 is a perspective view schematically illustrating a modified example of an all-solid-state battery according to an embodiment of the present invention. [Figure 9] FIG. 10 is a perspective view showing a modified example of an all-solid-state battery according to an embodiment of the present invention. [Figure 10] FIG. 10 is a cross-sectional view taken along line II-II' in FIG. [Figure 11] 10 is a diagram showing the inside of the first connecting portion of FIG. 9. FIG. [Figure 12] FIG. 1 is a perspective view schematically illustrating an all-solid-state battery according to another embodiment of the present invention. [Figure 13] FIG. 13 is a cross-sectional view taken along the line III-III' in FIG. [Figure 14] FIG. 14 is an enlarged view of region B in FIG. [Figure 15] FIG. 13 is a perspective view schematically showing the battery body of FIG. [Figure 16] FIG. 14 is a perspective view schematically illustrating the electrode assembly of FIG. 13. [Figure 17] 13 is a diagram showing the inside of the first connecting portion of FIG. 12. FIG. [Figure 18] FIG. 10 is a cross-sectional view of an all-solid-state battery according to yet another embodiment of the present invention. [Figure 19] FIG. 19 is a perspective view schematically showing the battery body of FIG. 18. [Figure 20] FIG. 10 is a cross-sectional view of an all-solid-state battery according to yet another embodiment of the present invention. [Figure 21] FIG. 21 is a perspective view schematically showing the battery body of FIG. 20. [Figure 22] FIG. 1 is a perspective view schematically illustrating an all-solid-state battery according to yet another embodiment of the present invention. [Figure 23] 23 is a diagram showing the inside of the first connecting portion of FIG. 22. FIG. [Figure 24] FIG. 1 is a perspective view schematically illustrating an all-solid-state battery according to yet another embodiment of the present invention. [Figure 25] 25 is a diagram showing the inside of the first connecting portion of FIG. 24. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described with reference to specific embodiments and the accompanying drawings. This is not intended to limit the technology described in this specification to specific embodiments, but should be understood to include various modifications, equivalents, and / or alternatives of the embodiments of the present invention. Similar reference numerals are used for similar components in the description of the drawings.

[0017] In order to clearly explain the present invention, parts not relevant to the explanation are omitted in the drawings, thicknesses are enlarged to clearly show various layers and regions, and components having the same function within the same concept are described using the same reference symbols.

[0018] In this specification, the terms "have," "can have," "include," or "can include" refer to the presence of a given feature (e.g., a value, function, operation, or component such as a part) and do not exclude the presence of additional features.

[0019] As used herein, phrases such as "A and / or B," "at least one of A and B," or "one or more of A and B" may include all possible combinations of the listed items. For example, "A and / or B," "at least one of A and B," or "one or more of A and B" may refer to (1) at least one A, (2) at least one B, or (3) both at least one A and at least one B.

[0020] In the drawings, the X direction may be defined as the first direction, L direction or length direction, the Y direction may be defined as the second direction, W direction or width direction, and the Z direction may be defined as the third direction, T direction or thickness direction.

[0021] The present invention relates to an all-solid-state battery 100. Figures 1 to 7 are diagrams that schematically show an all-solid-state battery 100 according to one embodiment of the present invention. 1 to 7, an all-solid-state battery 100 according to the present invention includes: an electrode assembly 120 having first and second surfaces S1, S2 facing in a first direction (X direction), third and fourth surfaces S3, S4 facing in a second direction (Y direction), and fifth and sixth surfaces S5, S6 facing in a third direction (Z direction), the electrode assembly 120 including a solid electrolyte 111, and a positive electrode 121 and a negative electrode 122 stacked in the third direction (Z direction) with the solid electrolyte 111 sandwiched therebetween; a battery body 110 including a first margin portion 131 disposed on the third surface S3 of the electrode assembly 120 and a second margin portion 132 disposed on the fourth surface S4 of the electrode assembly 120; a first connecting portion 141 disposed on the first surface of the electrode assembly 120; and a second connecting portion 142 disposed on the second surface of the electrode assembly 120.

[0022] In this case, the first connecting part 141 may include a first collecting electrode 141a connected to the positive electrode 121 and a first protective part 141b disposed on the first collecting electrode 141a, and the second connecting part 142 may include a second collecting electrode 142a connected to the negative electrode 122 and a second protective part 142b disposed on the second collecting electrode 142a. In addition, the first collecting electrode 141a and the second collecting electrode 142a may be drawn out to any one surface in the third direction (Z direction) of the first connecting part 141 and the second connecting part 142. The surface from which the first collecting electrode 141a and the second collecting electrode 142a are drawn out may be a direction toward a fifth surface S5 or a sixth surface S6 of the electrode assembly 120.

[0023] That is, the current collecting electrodes of the all-solid-state battery 100 according to this embodiment may have a structure in which the electrodes are drawn out only to one of the six external surfaces in the third direction (Z direction). When viewing the all-solid-state battery 100 according to this embodiment, each current collecting electrode may have a structure in which the drawn out electrodes are not visible on five surfaces, but are visible only on one surface in the third direction (Z direction).

[0024] Referring to FIG. 2 , the first and second current collecting electrodes 141a and 142a may be extended through one surface (sixth surface, S6) in the third direction (Z direction) of the electrode assembly 120, and the first and second current collecting electrodes 141a and 142a may be spaced apart from each other across the battery body 110. Conventional sintered-type all-solid-state batteries have a structure in which external electrodes connected to the positive and negative electrodes are disposed to cover the head surface of the battery body. This structure can cause problems such as gaps between the battery body and the external electrodes or moisture penetration between the battery body and the external electrodes. The above-described embodiment of the present invention can effectively prevent moisture penetration from the outside by minimizing the electrodes exposed to the outside, thereby achieving excellent moisture resistance reliability.

[0025] Furthermore, in conventional technologies, differences in the shrinkage behavior between the external electrodes and the battery body can cause residual internal stress, resulting in a problem of reduced mechanical strength of the battery itself. The all-solid-state battery of the present invention does not require the formation of separate external electrodes, and instead, as described below, the battery body and electrodes are simultaneously fired through a single sintering process, thereby improving the mechanical strength of the battery itself. Furthermore, because separate external electrodes are not required, the component itself can be made smaller.

[0026] The first connecting part 141 of the all-solid-state battery 100 according to the present invention may include a first current collecting electrode 141a and a first protective part 141b, and the second connecting part 142 may include a second current collecting electrode 142a and a second protective part 142b.

[0027] In one example of the present invention, the first protective part 141b of the all-solid-state battery 100 may be arranged to cover at least a portion of the first current collecting electrode 141a, and the second protective part 142b may be arranged to cover at least a portion of the second current collecting electrode 142a. The protective parts being arranged to cover at least a portion of the current collecting electrodes means that the protective parts are arranged on at least a portion of both surfaces in the first direction (X direction) of the first current collecting electrode 141a and the second current collecting electrode 142a arranged in the electrode assembly 120 of the all-solid-state battery 100 according to the present invention, and may mean that at least a portion of the protective parts is arranged in contact with the first current collecting electrode 141a and the second current collecting electrode 142a.

[0028] In another example, the first protective part 141b of the all-solid-state battery 100 may be arranged to cover the entire surface of the first collecting electrode 141a in the first direction (X direction), and the second protective part 142b may be arranged to cover the entire surface of the second collecting electrode 142a in the first direction (X direction). The protective part being arranged to cover the entire surface of the extraction electrode in the first direction may mean that when the all-solid-state battery 100 according to the present invention is viewed from the first direction (X direction), only the protective part is visible, and the extraction electrode is hidden by the protective part and cannot be seen. In other words, the first protective part 141b may be arranged so as not to expose the first collecting electrode 141a in the first direction, and the second protective part 142b may be arranged so as not to expose the second collecting electrode 142a in the first direction (X direction). In this manner, when the first protective part 141b is arranged to cover the first collecting electrode 141a and the second protective part 142b is arranged to cover the second collecting electrode 142a, the area of ​​the extraction electrode exposed to the outside can be reduced, thereby minimizing the path through which external moisture can penetrate.

[0029] Furthermore, in the all-solid-state battery 100 according to an embodiment of the present invention, the first protective part 141b may be disposed to cover the first surface S1 of the electrode assembly 120, and the second protective part 142b may be disposed to cover the second surface S2 of the electrode assembly 120. Thus, the first current collecting electrode 141a may be disposed in contact with the first surface S1 of the electrode assembly 120, and the first protective part 141b may be disposed to cover the first current collecting electrode 141a. Furthermore, the second current collecting electrode 142a may be disposed in contact with the second surface S2 of the electrode assembly 120, and the second protective part 142b may be disposed to cover the second current collecting electrode 142a. That is, the first current collecting electrode 141a may be disposed on the first surface S1 of the electrode assembly 120 and connected to the positive electrode 121, and the second current collecting electrode 142a may be disposed on the second surface S2 of the electrode assembly 120 and connected to the negative electrode 122.

[0030] In one embodiment of the present invention, the maximum value of the width of the first current collector electrode 141a and / or the second current collector electrode 142a of the all-solid-state battery 100 in the second direction (Y direction) may be smaller than the maximum value of the width of the battery body 110 in the second direction (Y direction). FIG. 7 schematically shows a cross section of the first connection portion 141 according to one embodiment of the present invention. In this specification, the description of the first connection portion 141 can be similarly applied to the second connection portion 142. Referring to FIGS. 1 and 7, the maximum value W2 of the width of the first current collector electrode 141a of the first connection portion 141 and / or the second current collector electrode 142a of the second connection portion 142 in the second direction (Y direction) may be smaller than the maximum value W1 of the width of the battery body 110 in the second direction (Y direction). That is, the relationship W2 < W1 can be satisfied. In this specification, the maximum value of the width of a certain member means the maximum value among the values measured in the direction parallel to the second direction (Y direction) at any five positions of the above member, and can be the value measured at normal temperature (25 ° C) and normal pressure (1 atm). When the maximum value of the width of the first current collector electrode 141a and / or the second current collector electrode 142a in the second direction (Y direction) is smaller than the maximum value of the width of the battery body 110 in the second direction (Y direction), the first current collector electrode 141a and / or the second current collector electrode 142a are not exposed in the second direction (Y direction) of the all-solid-state battery 100 according to the present invention, so that the moisture resistance can be further improved.

[0031] In one example, the maximum value of the height of the first current collector electrode 141a and / or the second current collector electrode 142a in the third direction (Z direction) according to the present invention may be smaller than the maximum value of the height of the battery body 110 in the third direction (Z direction). Referring to FIGS. 1 and 7, the maximum value H2 of the height of the first current collector electrode 141a of the first connection portion 141 and / or the second current collector electrode 142a of the second connection portion 142 in the third direction (Z direction) may be smaller than the maximum value H1 of the height of the battery body 110 in the third direction (Z direction). That is, the relationship H2 < H1 can be satisfied. In the present specification, the maximum value of the height of a certain member means the maximum value among the values measured in a direction parallel to the third direction (Z direction) at any five positions of the member, and can be a value measured at room temperature (25°C) and normal pressure (1 atm). When the maximum value of the height of the first current collector electrode 141a and / or the second current collector electrode 142a in the third direction (Z direction) is smaller than the maximum value of the height of the battery body 110 in the third direction (Z direction), by exposing only the first current collector electrode 141a and / or the second current collector electrode 142a on one side of the all-solid-state battery 100 in the third direction (Z direction) according to the present invention, the possibility of moisture penetration can be reduced.

[0032] As described above, when the first protection portion 141b is arranged to entirely cover one surface of the first current collector electrode 141a in the first direction (X direction), and the second protection portion 142b is arranged to entirely cover one surface of the second current collector electrode 142a in the first direction (X direction), the height (Z direction) of the first protection portion 141b and / or the second protection portion 142b in the third direction can be equal to the maximum value H1 of the height of the battery body 110 in the third direction (Z direction). That is, the first protection portion 141b and the second protection portion 142b are arranged on both surfaces of the battery body 110 in the first direction, and can be arranged to at least entirely cover the thickness direction of the battery body 110.

[0033] Furthermore, as described above, when the first protective part 141b is arranged to cover the entire surface of the first collecting electrode 141a in the first direction (X direction) and the second protective part 142b is arranged to cover the entire surface of the second collecting electrode 142a in the first direction (X direction), the width in the second direction (Y direction) of the first protective part 141b and / or the second protective part 142b may be equal to the maximum value W1 of the width in the second direction (Y direction) of the battery body 110. That is, the first protective part 141b and the second protective part 142b may be arranged on both sides of the battery body 110 in the first direction and may be arranged to cover at least the entire width of the battery body 110 in the width direction.

[0034] In addition, in one example of the present invention, when the first protective part 141b is arranged to cover the entire surface of the first collecting electrode 141a in the first direction (X direction) and the second protective part 142b is arranged to cover the entire surface of the second collecting electrode 142a in the first direction (X direction), the first protective part 141b and the second protective part 142b may be arranged to cover the entire surfaces of the battery body 110 in the first direction.

[0035] In one embodiment of the present invention, a battery body 110 of an all-solid-state battery 100 according to the present invention can include an electrode assembly 120, a first margin portion 131, and a second margin portion 132. The electrode assembly 120 can include a solid electrolyte layer 111, and a positive electrode 121 and a negative electrode 122 stacked in a third direction (Z direction) with the solid electrolyte layer 111 sandwiched therebetween.

[0036] The positive electrode and the negative electrode 121, 122 may be stacked such that their end surfaces are exposed to opposite ends of the battery body 110. Specifically, the positive electrode and the negative electrode 121, 122 may be exposed to both surfaces of the battery body 110 in a first direction (X direction), and the positive electrode 121 may be exposed to a first surface S1 of the battery body 110, and the negative electrode 122 may be exposed to a second surface S2 of the battery body 110.

[0037] In one example, the positive electrode 121 of the all-solid-state battery 100 according to the present invention may include a positive electrode current collector 121a and a positive electrode active material 121b. Fig. 3 is an enlarged view of region A in Fig. 2. Referring to Fig. 3, the positive electrode 121 of the all-solid-state battery 100 according to this example may have a structure in which the positive electrode active material 121b is disposed on both sides of the positive electrode current collector 121a in the third direction.

[0038] In one example of the present invention, the positive electrode active material 121b included in the positive electrode 121 is not particularly limited as long as it can ensure sufficient capacity. For example, the positive electrode active material 121b may include one or more selected from the group consisting of lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium iron phosphate, and lithium manganese oxide, but is not necessarily limited thereto, and any positive electrode active material available in the art may be used.

[0039] The positive electrode active material may be, for example, a compound represented by the following chemical formula: Li a A 1-b M b D2 (in the formula, 0.90≦a≦1.8, 0≦b≦0.5);Li a E 1-b MbO 2-c D c (In the formula, 0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.05);LiE 2-b M b O 4-c D c (In the formula, 0≦b≦0.5, 0≦c≦0.05);Li a Ni 1-b-c Co b M c D α (In the formula, 0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.05, 0<α≦2);Li a Ni 1-b-c Co b M c O 2-α X α (In the formula, 0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.05, 0<α<2);Li a Ni1-b-c Co b M c O 2-α X2 (where 0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.05, 0<α<2);Li a Ni 1-b-c Mn b M c D α (In the formula, 0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.05, 0<α≦2); Li a Ni 1-b-c Mn b M c O 2-α X α (In the formula, 0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.05, 0<α<2); Li a Ni 1-b-c Mn b M c O 2-α X2 (where 0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.05, 0<α<2);Li a Ni b E c G d O2 (where 0.90≦a≦1.8, 0≦b≦0.9, 0≦c≦0.5, 0.001≦d≦0.1); Li a Ni b Co c Mn d G e O2 (where 0.90≦a≦1.8, 0≦b≦0.9, 0≦c≦0.5, 0≦d≦0.5, 0.001≦e≦0.1); Li a NiG b O2 (where 0.90≦a≦1.8, 0.001≦b≦0.1); Li a CoG b O2 (where 0.90≦a≦1.8, 0.001≦b≦0.1); Li a MnG b O2 (where 0.90≦a≦1.8, 0.001≦b≦0.1); Li a Mn2G b O4 (where 0.90≦a≦1.8, 0.001≦b≦0.1); QO2; QS2; LiQS2; V2O5; LiV2O2; LiRO2; LiNiVO4; Li (3-f) J2(PO4)3(0≦f≦2);Li(3-f) Fe2(PO4)3 (where 0≦f≦2); and LiFePO4, where A is Ni, Co, or Mn; M is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, or a rare-earth element; D is O, F, S, or P; E is Co or Mn; X is F, S, or P; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, or V; Q is Ti, Mo, or Mn; R is Cr, V, Fe, Sc, or Y; and J is V, Cr, Mn, Co, Ni, or Cu.

[0040] The positive electrode active material may also be LiCoO2, LiMn x O 2x (wherein x is 1 or 2), LiNi 1-x Mn x O 2x (In the formula, 0 <x<1)、LiNi 1-x-y Co x Mn y It can be, but is not limited to, O2 (where 0≦x≦0.5, 0≦y≦0.5), LiFePO4, TiS2, FeS2, TiS3, or FeS3.

[0041] The positive electrode current collector may be a porous material such as a net or mesh, and may be a porous metal plate made of stainless steel, nickel, aluminum, etc., but is not limited thereto. The positive electrode current collector may also be coated with an oxidation-resistant metal or alloy film to prevent oxidation.

[0042] The positive electrode of the all-solid-state battery according to the present invention may optionally contain a conductive agent and a binder. The conductive agent is not particularly limited as long as it does not induce chemical changes in the all-solid-state battery according to the present invention and has conductivity. For example, graphite such as natural graphite or artificial graphite; carbon-based materials such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black; conductive fibers such as carbon fiber and metal fiber; carbon fluoride; metal powders such as aluminum and nickel powder; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; and conductive materials such as polyphenylene derivatives may be used.

[0043] The binder can be used to improve the binding strength between the active material and the conductive agent, etc. Examples of the binder include, but are not limited to, polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene-butadiene rubber, fluororubber, and various copolymers.

[0044] The positive electrode used in the secondary battery of the present invention can be prepared by directly coating a composition containing a positive electrode active material onto a positive electrode current collector containing a metal such as copper and drying the composition. Alternatively, the positive electrode can be prepared by casting the positive electrode active material composition onto a separate support and then curing the resulting composition, in which case a separate positive electrode current collector may not be required.

[0045] The negative electrode 122 of the all-solid-state battery 100 according to the present invention may include a negative electrode current collector 122a and a negative electrode active material 122b. Fig. 3 is an enlarged view of region A in Fig. 2. Referring to Fig. 3, the negative electrode 122 of the all-solid-state battery 100 according to the present example may have a structure in which the negative electrode active material 122b is disposed on both sides of the negative electrode current collector 122a in the third direction.

[0046] The negative electrode included in the all-solid-state battery according to the present invention can contain a commonly used negative electrode active material. As the above negative electrode active material, carbon-based materials, silicon, silicon oxide, silicon-based alloys, silicon-carbon-based material composites, tin, tin-based alloys, tin-carbon composites, metal oxides, or combinations thereof can be used, and can contain lithium metal and / or lithium metal alloys.

[0047] The above lithium metal alloy can contain lithium and a metal / metalloid alloyable with lithium. For example, the above metal / metalloid alloyable with lithium is Si, Sn, Al, Ge, Pb, Bi, Sb, Si-Y alloy (where Y is an alkali metal, alkaline earth metal, group 13-16 element, transition metal, rare earth element, or a combination element thereof, excluding Si), Sn-Y alloy (where Y is an alkali metal, alkaline earth metal, group 13-16 element, transition metal, lithium titanate (Li4Ti5O 12 ) and other transition metal oxides, rare earth elements, or a combination element thereof, excluding Sn), and MnO x (0 < x ≦ 2) and the like. Examples of the above element Y include Mg, Ca, Sr, Ba, Ra, Sc, Y, Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W, Sg, Tc, Re, Bh, Fe, Pb, Ru, Os, Hs, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, Sn, In, Tl, Ge, P, As, Sb, Bi, S, Se, Te, Po, or combinations thereof.

[0048] Also, the oxides of the above metal / metalloid alloyable with lithium can be lithium titanate, vanadium oxide, lithium vanadate, SnO2, SiO x (0 < x < 2) and the like. For example, the above negative electrode active material can contain one or more elements selected from the group consisting of group 13-16 elements of the periodic table of elements. For example, the above negative electrode active material can contain one or more elements selected from the group consisting of Si, Ge, and Sn.

[0049] The carbon-based material can be crystalline carbon, amorphous carbon, or a mixture thereof. The crystalline carbon can be graphite such as amorphous, plate-like, flaky, spherical, or fibrous natural graphite or artificial graphite. Further, the amorphous carbon can be soft carbon (low-temperature calcined carbon) or hard carbon, mesophase pitch carbide, calcined coke, graphene, carbon black, fullerene soot, carbon nanotube, and carbon fiber, etc., but is not limited thereto.

[0050] The silicon is Si, SiO x (0 < x < 2, for example, 0.5 to 1.5), Sn, SnO2, or a silicon-containing metal alloy, and those selected from the group consisting of mixtures thereof can be used. The silicon-containing metal alloy can include, for example, silicon and one or more of Al, Sn, Ag, Fe, Bi, Mg, Zn, In, Ge, Pb, and Ti.

[0051] The negative electrode current collector of the all-solid-state battery according to the present invention can have the same configuration as the positive electrode current collector. The negative electrode current collector can use, for example, a porous body such as a net-like or mesh-like one, and a porous metal plate such as stainless steel, nickel, aluminum, etc. can be used, but is not limited thereto. Further, the negative electrode current collector may be coated with an oxidation-resistant metal or alloy film to prevent oxidation.

[0052] The negative electrode can be manufactured by substantially the same method except that a negative electrode active material is used instead of the positive electrode active material in the manufacturing process of the above-described positive electrode.

[0053] In one embodiment of the present invention, the solid electrolyte layer according to the present invention can be one or more selected from the group consisting of Garnet-type, NASICON-type, LISICON-type, perovskite-type, and LiPON-type.

[0054] The above Garnet-type solid electrolyte means lithium lanthanum zirconium oxide (LLZO) represented by Li7La3Zr2O 12 such as Li a La b Zr c O 12 and the above NASICON-type solid electrolyte means lithium-aluminum-titanium-phosphate (LATP) of Li 1+x Al x M 2-x (PO4)3 (LAMP) (0 < x < 2, M = Zr, Ti, Ge) type compound into which Ti is introduced, Li 1+x Al x Ti 2-x (PO4)3 (0 < x < 1), lithium-aluminum-germanium-phosphate (LAGP) represented by Li 1.3 Al 0.3 Ti 1.7 (PO4)3 such as Li 1+x Al x Ge 2-x (PO4)3 (0 < x < 1) and / or lithium-zirconium-phosphate (LZP) of LiZr2(PO4)3.

[0055] In addition, the above LISICON-type solid electrolyte is represented by xLi3AO4-(1-x)Li4BO4 (A: P, As, V, etc., B: Si, Ge, Ti, etc.), Li4Zn(GeO4)4, Li 10 GeP2O 12 (LGPO), Li 3.5 Si 0.5 P 0.5 O4, Li 10.42 Si(Ge)1.5 P 1.5 Cl 0.08 O 11.92 Solid oxide containing, etc., and Li 4-x M 1-y It may mean solid sulfide containing Li2S-P2S5, Li2S-SiS2, Li2S-SiS2-P2S5, Li2S-GeS2, etc. represented by M'y'S4 (M = Si, Ge, and M' = P, Al, Zn, Ga).

[0056] And, the above perovskite-type solid electrolyte means lithium-lanthanum-titanate (LLTO) represented by Li 1 / 8 La 5 / 8 TiO3, etc., Li 3x La 2 / 3-x □ 1 / 3-2x TiO3 (0 < x < 0.16, □ is a vacancy), and the above lipon-type solid electrolyte may mean nitrides such as lithium-phosphorous-oxynitride 2.8 PO 3.3 N 0.46 etc.

[0057] The battery body 110 of the all-solid-state battery 100 according to the present invention may include a first margin portion 131 disposed on the third surface S3 of the electrode assembly 120 and a second margin portion 132 disposed on the fourth surface S4 of the electrode assembly 120. The first margin portion 131 and the second margin portion 132 may include a ceramic material, such as, but not limited to, alumina (Al2O3), aluminum nitride (AlN), beryllium oxide (BeO), boron nitride (BN), silicon (Si), silicon carbide (SiC), silica (SiO2), silicon nitride (Si3N4), gallium arsenide (GaAs), gallium nitride (GaN), barium titanate (BaTiO3), zirconium dioxide (ZrO2), mixtures thereof, oxides and / or nitrides of these materials, or any other suitable ceramic material. In addition, the first margin portion 131 and the second margin portion 132 may include the above-mentioned solid electrolyte, and may include one or more kinds of solid electrolytes, but are not limited thereto.

[0058] The first margin portion 131 and the second margin portion 132 may be formed by applying a slurry containing a ceramic material in the second direction (Y direction) of the electrode assembly 120, or by attaching one or more sheets made of a ceramic material in the second direction (Y direction). The first margin portion 131 and the second margin portion 132 basically serve to prevent damage to the electrode assembly due to physical or chemical stress.

[0059] In the all-solid-state battery 100 according to an embodiment of the present invention, a first connecting part 141 and a second connecting part 142 may be disposed on both sides of the battery body 110 in a first direction (X direction). The first connecting part 141 and the second connecting part 142 may have dimensions and areas corresponding to both sides of the battery body 110 in the first direction (X direction). As described above, the first connecting part 141 may be disposed to cover a first side of the electrode assembly 120, and the second connecting part 142 may be disposed to cover a second side of the electrode assembly 120.

[0060] The first connecting part 141 may include a first collecting electrode 141a, and the second connecting part 142 may include a second collecting electrode 142a. The first collecting electrode 141a may be connected to the positive electrode 121, and the second collecting electrode 142a may be connected to the negative electrode 122. The material for forming the first collecting electrode 141a and the second collecting electrode 142a is not particularly limited, and may be formed using a conductive paste including one or more conductive metals selected from silver (Ag), palladium (Pd), gold (Au), platinum (Pt), nickel (Ni), copper (Cu), tin (Sn), tungsten (W), titanium (Ti), and alloys thereof.

[0061] The first connecting portion 141 may include a first protective portion 141b, and the second connecting portion 142 may include a second protective portion 142b. The first protective portion 141b and the second protective portion 142b may include a ceramic material, and may include the same ceramic material as the first margin portion 131 and the second margin portion 132 of the battery body 110. When the first protective portion 141b and the second protective portion 142b include the same ceramic material as the first margin portion 131 and the second margin portion 132, they may exhibit similar sintering behavior, thereby reducing internal stress in the completed all-solid-state battery.

[0062] In another example of the present invention, the first protective portion 141b and / or the second protective portion 142b of the first connecting portion 141 and / or the second connecting portion 142 of the all-solid-state battery 100 according to the present invention may include a ceramic component having a different composition from the first margin portion 131 and the second margin portion 132 of the battery body 110. Because the first protective portion 141b and the second protective portion 142b are disposed on the first collecting electrode 141a and the second collecting electrode 142a, a significant portion of the area in contact with the battery body 110 is disposed in contact with the metal component. The interface between the different components, such as the metal and the ceramic material, may have a weak adhesive strength due to shrinkage during the sintering process. Adjusting the sintering behavior by adjusting the composition of the first protective portion 141b and the second protective portion 142b, as in this example, can improve the adhesive strength between the first protective portion 141b and the second protective portion 142b and the first collecting electrode 141a and the second collecting electrode 142a, thereby improving the reliability of the battery.

[0063] The manufacturing method of the all-solid-state battery according to the present invention is not particularly limited, and may be, for example, formed by forming the first margin portion 131 on the third surface S3 of the electrode assembly 120, forming the second margin portion 132 on the fourth surface S4, and then forming the first connecting portion 141 and the second connecting portion 142. The first connecting portion 141 and the second connecting portion 142 may be formed by applying and drying a conductive paste for forming the first collecting electrode 141a and the second collecting electrode 142a on both surfaces in the first direction (X direction) of the battery body 110, applying and drying a ceramic paste for forming the first protective portion 141b and the second protective portion 142b on the dried conductive paste, and then sintering the applied paste. Alternatively, the all-solid-state battery may be manufactured by transferring a ceramic sheet for forming the first protective portion 141b and the second protective portion 142b onto the dried conductive paste and then sintering the applied paste.

[0064] Alternatively, to manufacture the first connecting part 141 and the second connecting part 142, the first and second current collecting electrodes 141a, 142a may be printed on the first and second protective parts 141b, 142b, which are previously manufactured, such as ceramic sheets, and then the printed parts may be attached to both sides of the battery body 110 in the first direction (X direction) and sintered. In this way, the all-solid-state battery 100 according to the present invention can be manufactured through a single sintering process after forming the first connecting part 141 and the second connecting part 142 on the battery body 110, and a firing process for forming a separate external electrode is not required, thereby simplifying the manufacturing process.

[0065] In one example of the present invention, the all-solid-state battery 100 according to the present invention may further include a first terminal electrode 151 connected to the first current collecting electrode 141a and a second terminal electrode 152 connected to the second current collecting electrode 142a. In this case, the first terminal electrode 151 and the second terminal electrode 152 may be disposed spaced apart from each other on a surface from which the first current collecting electrode 141a and the second current collecting electrode 142a are extended. Referring to FIGS. 1 and 2, the first current collecting electrode 141a and the second current collecting electrode 142a may be extended to one surface in the third direction (Z direction) of the all-solid-state battery 100, and the first terminal electrode 151 connected to the first current collecting electrode 141a and the second terminal electrode 152 connected to the second current collecting electrode 142a may be disposed.

[0066] The first and second terminal electrodes 151 and 152 may be formed by, for example, applying a terminal electrode paste containing a conductive metal to the lead-out portions of the first and second collecting electrodes 141a and 142a, respectively. Alternatively, they may be formed by applying a terminal electrode paste or powder to the first and second collecting electrodes 141a and 142a of the sintered battery body 110 and firing the paste or powder using a method such as induction heating. Alternatively, the first and second terminal electrodes 151 and 152 may be formed by sputtering or electrolytic deposition of a conductive metal on the lead-out portions of the first and second collecting electrodes 141a and 142a, respectively, but are not limited thereto. The conductive metal may be, for example, one or more of copper (Cu), nickel (Ni), tin (Sn), palladium (Pd), platinum (Pt), gold (Au), silver (Ag), tungsten (W), titanium (Ti), lead (Pb), and alloys thereof, but are not limited thereto.

[0067] In one example, the all-solid-state battery 100 according to the present invention may further include plating layers (not shown) disposed on the first terminal electrode 151 and the second terminal electrode 152, respectively. The plating layers may include, but are not limited to, one or more selected from the group consisting of copper (Cu), nickel (Ni), tin (Sn), palladium (Pd), platinum (Pt), gold (Au), silver (Ag), tungsten (W), titanium (Ti), lead (Pb), and alloys thereof. The plating layers may be formed as a single layer or multiple layers and may be formed by sputtering or electroplating (electrodeposition), but are not limited thereto.

[0068] According to an embodiment of the present invention, the first current collecting electrode 141a and the second current collecting electrode 142a of the all-solid-state battery 100 may be extended to opposite sides of the battery body 110 in the third direction (Z direction). FIG. 8 is a perspective view showing the all-solid-state battery 100 according to this embodiment. Referring to FIG. 8, the all-solid-state battery 100 according to this embodiment may have a structure in which the first current collecting electrode 141a and the second current collecting electrode 142a are extended in opposite directions. For example, the first current collecting electrode 141a may be extended toward the top surface of the all-solid-state battery, and the second current collecting electrode 142a may be extended toward the bottom surface.

[0069] In this case, when the first terminal electrode 151′ is disposed on the first current collecting electrode 141a and the second terminal electrode 152′ is disposed on the second current collecting electrode 142a, the first terminal electrode 151′ and the second terminal electrode 152′ may also be extended to opposite sides of the battery body 110 in the third direction (Z direction). When the first and second current collecting electrodes are extended in different directions as in the present embodiment, the all-solid-state battery 100 can be applied between substrates of a multilayer structure, thereby improving space utilization.

[0070] In the present embodiment, the maximum width W2 of the first current collecting electrode 141a and / or the second current collecting electrode 142a of the all-solid-state battery 100 in the second direction (Y direction) may be smaller than the maximum width W3 of the battery body 110 in the second direction (Y direction). Furthermore, the maximum height H2 of the first current collecting electrode 141a and / or the second current collecting electrode 142a of the all-solid-state battery 100 in the third direction (Z direction) may be smaller than the maximum height H3 of the battery body 110 in the third direction (Z direction).

[0071] According to another embodiment of the present invention, the first current collecting electrode 141a and the second current collecting electrode 142a of the all-solid-state battery 100 of the present invention may be drawn out to both sides in the third direction (Z direction) of the battery body 110. Figures 9 to 11 are diagrams schematically showing the all-solid-state battery 100 according to this embodiment. Referring to Figures 9 to 11, in the all-solid-state battery 100 according to this embodiment, the first connecting portion 141 and the second connecting portion 142 are arranged on both sides in the first direction (X direction) of the electrode assembly 120, in which the first margin portion 131 and the second margin portion 132 are respectively arranged on both sides in the second direction (Y direction). Here, the first connecting portion 141 includes a first collecting electrode 141a and a first protective portion 141b, and the second connecting portion 142 includes a second collecting electrode 142a and a second protective portion 142b, and the first collecting electrode 141a and the second collecting electrode 142a are respectively drawn out to both sides in the third direction (Z direction).

[0072] In this case, when the first terminal electrode 151'' and the third terminal electrode 153'' are disposed on the first current collecting electrode 141a, and the second terminal electrode 152'' and the fourth terminal electrode 154'' are disposed on the second current collecting electrode 142a, the first terminal electrode 151'' and the third terminal electrode 153'' can be drawn out to both sides in the third direction (Z direction) of the battery body 110, and the second terminal electrode 152'' and the fourth terminal electrode 154'' can also be drawn out to both sides in the third direction (Z direction) of the battery body 110. That is, the all-solid-state battery 100 according to the present embodiment can have a structure in which current collecting electrodes of the same polarity are drawn out to two locations, or a structure in which current collecting electrodes are drawn out to a total of four locations.

[0073] In this embodiment, the maximum width W5 of the first current collecting electrode 141a and / or the second current collecting electrode 142a of the all-solid-state battery 100 in the second direction (Y direction) may be smaller than the maximum width W4 of the battery body 110 in the second direction (Y direction).

[0074] In one example, the maximum height H5 of the first current collecting electrode 141a and the second current collecting electrode 142a in the third direction (Z direction) of the all-solid-state battery 100 according to the present invention may be equal to the maximum height H4 of the battery body 110 in the third direction (Z direction). In this specification, "a certain length, width, and / or height being equal" is assumed to include a margin of error. Here, the margin of error may mean, but is not limited to, ±3 μm or less, ±2 μm or less, or ±1 μm or less.

[0075] In one example, the all-solid-state battery 100 according to the present invention may have a length in a first direction (X direction) longer than a width in a second direction (Y direction). Figures 1 to 11 show all-solid-state batteries 100 based on the structure of this example. The above example structure has a length in the first direction (X direction) longer than a width in the second direction (Y direction), and electrodes connected to the outside are disposed at both ends in the first direction (X direction). In this case, it is possible to improve moisture resistance reliability and maximize capacity.

[0076] In another example of the present invention, the all-solid-state battery 200 according to the present invention may have a length in a first direction (X direction) shorter than a width in a second direction (Y direction). FIGS. 12 to 17 are diagrams illustrating the all-solid-state battery 200 according to this example. Referring to FIGS. 12 to 17, the all-solid-state battery 200 according to this example may have a structure in which the length in the first direction (X direction) is shorter than the width in the second direction (Y direction), and the first connecting portion 241 includes a first protective portion 241b arranged in contact with the first collecting electrode 241a, and the second connecting portion 242 includes a second protective portion 242b arranged in contact with the second collecting electrode 242a. This configuration has a structure in which the distance between electrodes connected to the outside is relatively short, making it possible to realize a chip with excellent moisture resistance reliability and low ESL.

[0077] In this example, the maximum width W7 of the first current collecting electrode 241a and / or the second current collecting electrode 242a of the all-solid-state battery 200 in the second direction (Y direction) may be smaller than the maximum width W6 of the battery body 210 in the second direction (Y direction). Furthermore, the maximum height H7 of the first current collecting electrode 241a and / or the second current collecting electrode 242a according to the present invention in the third direction (Z direction) may be smaller than the maximum height H6 of the battery body 210 in the third direction (Z direction).

[0078] In the above example, the all-solid-state battery 200 of the present invention may include a first terminal electrode 251 connected to the first current collecting electrode 241a, and may include a second terminal electrode 252 connected to the second current collecting electrode 242a.

[0079] In one example, the positive electrode 221 of the all-solid-state battery 200 according to the present invention can include a positive electrode current collector 221 a and a positive electrode active material 221 b. The negative electrode 222 can include a negative electrode current collector 222 a and a negative electrode active material 222 b. The positive electrode 221, the negative electrode 222, and the solid electrolyte layer 211 of the all-solid-state battery 200 according to this example have been described above, and therefore will not be described again.

[0080] According to an embodiment of the present invention, the first current collecting electrode 241a and the second current collecting electrode 242a of the all-solid-state battery 200 may be extended to opposite sides of the battery body 210 in the third direction (Z direction). The all-solid-state battery 200 according to this embodiment may have a structure in which the first current collecting electrode 241a and the second current collecting electrode 242a are extended in opposite directions. For example, the first current collecting electrode 241a may be extended toward the top surface of the all-solid-state battery, and the second current collecting electrode 242a may be extended toward the bottom surface.

[0081] According to another embodiment of the present invention, the first current collecting electrode 241a and the second current collecting electrode 242a of the all-solid-state battery 200 of the present invention may be drawn out to both sides of the battery body 210 in the third direction (Z direction).

[0082] According to yet another embodiment of the present invention, an all-solid-state battery 300 according to the present invention may have a positive electrode 321 and a negative electrode 322 stacked in a second direction (Y direction). FIGS. 18 and 19 are diagrams illustrating an all-solid-state battery 300 according to this embodiment. Referring to FIGS. 18 and 19, first and second margin portions 331 and 332 may be disposed on both surfaces of an electrode assembly 320 in a third direction (Z direction), respectively, of the all-solid-state battery 300 of this example. The electrode assembly 320 may have a solid electrolyte 311, a positive electrode 321, and a negative electrode 322 stacked in order in the second direction (Y direction). A first connecting portion 341 and a second connecting portion 342 may be disposed on both surfaces of the battery body 310 in a first direction (X direction). The first connecting portion 341 may include a first collecting electrode 341a and a first protective portion 341b, and the second connecting portion 342 may include a second collecting electrode 342a and a second protective portion 342b. In this case, the first and second collector electrodes 341a and 342a may be drawn out to one side in the third direction (Z direction).

[0083] The all-solid-state battery 300 according to the above embodiment may have a length in a first direction (X direction) longer than a width in a second direction (Y direction). The above example structure is a structure in which the length in the first direction (X direction) is longer than the width in the second direction (Y direction), and electrodes connected to the outside are disposed at both ends in the first direction (X direction). In this case, it is possible to improve moisture resistance reliability and maximize capacity.

[0084] In another example of the present invention, the length of an all-solid-state battery 400 according to the present invention in a first direction (X direction) may be shorter than its width in a second direction (Y direction). FIGS. 20 and 21 are diagrams illustrating an all-solid-state battery 400 according to this example. Referring to FIGS. 20 and 21, the all-solid-state battery 400 according to this example may have a structure in which the length in the first direction (X direction) is shorter than its width in the second direction (Y direction), and the first connecting portion 441 includes a first protective portion 441b disposed in contact with the first collecting electrode 441a, and the second connecting portion 442 includes a second protective portion 442b disposed in contact with the second collecting electrode 442a. This structure has a relatively short distance between electrodes connected to the outside, making it possible to realize a chip with excellent moisture resistance reliability and low ESL.

[0085] 22 and 23 are diagrams illustrating an all-solid-state battery 500 according to another embodiment of the present invention. Referring to FIGS. 22 and 23, first and second margin portions 531 and 532 may be disposed on both surfaces of an electrode assembly 520 in a third direction (Z direction), respectively, of the all-solid-state battery 500 of this embodiment. The electrode assembly 520 may include a solid electrolyte 511, a positive electrode 521, and a negative electrode 522 stacked in order in the third direction (Z direction). Furthermore, a first connecting portion 541 and a second connecting portion 542 may be disposed on both surfaces of the battery body 510 in a first direction (X direction), respectively. The first connecting portion 541 may include a first current collecting electrode 541a and a first protective portion 541b, and the second connecting portion 542 may include a second current collecting electrode 542a and a second protective portion 542b. In this case, the first and second collector electrodes 541a and 542a may be drawn out to both sides in the third direction (Z direction) and both sides in the second direction (Y direction).

[0086] In the present embodiment, the maximum width W8 of the first current collecting electrode 541a and / or the second current collecting electrode 542a of the all-solid-state battery 500 in the second direction (Y direction) may be equal to the maximum width W8 of the battery body 510 in the second direction (Y direction). Furthermore, the maximum height H8 of the first current collecting electrode 541a and / or the second current collecting electrode 542a of the all-solid-state battery 500 in the third direction (Z direction) may be equal to the maximum height H8 of the battery body 510 in the third direction (Z direction).

[0087] In one example of the present invention, the all-solid-state battery 500 according to the present invention may further include a first terminal electrode 551 connected to the first current collecting electrode 541a and a second terminal electrode 552 connected to the second current collecting electrode 542a. In this case, the first terminal electrode 551 and the second terminal electrode 552 may be disposed spaced apart from each other on a surface from which the first current collecting electrode 541a and the second current collecting electrode 542a are drawn.

[0088] According to an embodiment of the present invention, the first current collecting electrode 541a and the second current collecting electrode 542a of the all-solid-state battery 500 may be drawn out to opposite sides of the battery body 510 in the third direction (Z direction).

[0089] According to another embodiment of the present invention, the first current collecting electrode 541a and the second current collecting electrode 542a of the all-solid-state battery 500 of the present invention may be drawn out to both sides of the battery body 510 in the third direction (Z direction).

[0090] In the above embodiment, the all-solid-state battery 500 according to the present invention may have a length in a first direction (X direction) longer than a width in a second direction (Y direction). The structure of the above embodiment is a structure in which the length in the first direction (X direction) is longer than the width in the second direction (Y direction), and electrodes for connecting to the outside are disposed at both ends in the first direction (X direction). In this case, it is possible to improve moisture resistance reliability and maximize capacity.

[0091] In another example of the present invention, an all-solid-state battery 600 according to the present invention may have a length in a first direction (X direction) shorter than a width in a second direction (Y direction). FIGS. 24 and 25 are diagrams showing an all-solid-state battery 600 according to another example of the present invention. The all-solid-state battery 600 of this example may have a structure in which the length in the first direction (X direction) is shorter than the width in the second direction (Y direction), and the first connecting portion 641 includes a first protective portion 641b arranged in contact with the first collecting electrode 641a, and the second connecting portion 642 includes a second protective portion 642b arranged in contact with the second collecting electrode 642a. This configuration provides a structure in which the distance between electrodes connected to the outside is relatively short, making it possible to realize a chip with excellent moisture resistance reliability and low ESL.

[0092] In one example, the all-solid-state battery according to the present invention may further include a positive electrode active material disposed at an end of the positive electrode facing the second connection part and / or a negative electrode active material disposed at an end of the negative electrode facing the first connection part. That is, in this case, the positive electrode active material may be disposed on a head surface of the positive electrode current collector, and the surface of the positive electrode current collector may be disposed in contact with the positive electrode active material. Also, the negative electrode active material may be disposed on a head surface of the negative electrode current collector, and the surface of the negative electrode current collector may be disposed in contact with the negative electrode active material.

[0093] In another embodiment, the all-solid-state battery according to the present invention may further include an insulating member disposed at an end of the positive electrode facing the second connecting portion and / or an end of the negative electrode facing the first connecting portion. The end of the positive electrode facing the second connecting portion and / or the end of the negative electrode facing the first connecting portion may be a so-called "first direction margin," which may refer to a space separating the positive electrode and the negative electrode to prevent short-circuiting. Including an insulating member in the space can prevent defects such as short circuits. The insulating member may include a ceramic component, for example, the same component as the ceramic component of the margin portion.

[0094] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments and the accompanying drawings, but is limited by the appended claims. Therefore, various substitutions, modifications, and changes may be made by those skilled in the art without departing from the technical spirit of the present invention as set forth in the claims, and these also fall within the scope of the present invention. [Explanation of symbols]

[0095] 100 solid state battery 110 Battery body 120 Electrode assembly 111 Solid electrolyte 121 Positive electrode 122 Negative electrode 131 First Margin 132 Second Margin 141 1st connection part 142 2nd connection part

Claims

1. a battery body including: an electrode assembly having first and second surfaces facing each other in a first direction, third and fourth surfaces facing each other in the second direction, and fifth and sixth surfaces facing each other in the third direction, the electrode assembly including a solid electrolyte layer, and a positive electrode and a negative electrode stacked in the third direction with the solid electrolyte layer sandwiched therebetween; a first margin portion disposed on the third surface of the electrode assembly; and a second margin portion disposed on the fourth surface of the electrode assembly; a first connection portion disposed on a first surface of the electrode assembly; a second connection portion disposed on a second surface of the electrode assembly, the first connection part includes a first current collecting electrode connected to the positive electrode and a first protection part disposed on the first current collecting electrode, the second connection part includes a second current collecting electrode connected to the negative electrode and a second protection part disposed on the second current collecting electrode, the first current collecting electrode is drawn out to one surface of the first connection part in a third direction, and an end of the first current collecting electrode on the other surface in the third direction is covered by the first protection part on the first surface of the electrode assembly; the second current collecting electrode is drawn out to one surface of the second connection part in a third direction, and an end of the second current collecting electrode on the other surface side in the third direction is covered by the second protection part on the second surface of the electrode assembly.

2. the first protective portion is disposed so as to cover at least a portion of the first current collecting electrode, The all-solid-state battery according to claim 1 , wherein the second protective portion is disposed so as to cover at least a portion of the second current collecting electrode.

3. the first protection portion is disposed to cover the entire surface of the first current collecting electrode in a first direction, The all-solid-state battery according to claim 1 , wherein the second protective portion is arranged to cover an entire surface of the second current collecting electrode in the first direction.

4. The all-solid-state battery according to claim 1 , wherein a maximum value of the width in the second direction of the first current collecting electrode and / or the second current collecting electrode is smaller than a maximum value of the width in the second direction of the battery body.

5. The all-solid-state battery according to claim 1 , wherein a maximum value of a height in the third direction of the first current collecting electrode and / or the second current collecting electrode is smaller than a maximum value of a height in the third direction of the battery body.

6. The positive electrode includes a positive electrode current collector and a positive electrode active material. The all-solid-state battery according to claim 1 , wherein the negative electrode comprises a negative electrode current collector and a negative electrode active material.

7. a first terminal electrode connected to the first collecting electrode and a second terminal electrode connected to the second collecting electrode, The all-solid-state battery according to claim 1 , wherein the first terminal electrode and the second terminal electrode are disposed spaced apart from each other on a surface from which the first current collecting electrode and the second current collecting electrode are drawn out.

8. Further comprising: a first terminal electrode connected to the first collecting electrode; and a second terminal electrode connected to the second collecting electrode; 2. The all-solid-state battery of claim 1, wherein the first terminal electrode is connected to an end of the first current collecting electrode extended to one side in the third direction, and the second terminal electrode is connected to an end of the second current collecting electrode extended to one side in the third direction.

9. An all-solid-state battery as described in claim 8, wherein the first terminal electrode is arranged on a surface from which the first collecting electrode is pulled out, and the second terminal electrode is arranged on a surface from which the second collecting electrode is pulled out.

10. The all-solid-state battery according to claim 1 , wherein the first current collecting electrode and the second current collecting electrode are extended to opposite surfaces of the battery body in the third direction.

11. The all-solid-state battery according to claim 1 , wherein the length in the first direction is longer than the width in the second direction.

12. The all-solid-state battery according to claim 1 , wherein the length in the first direction is shorter than the width in the second direction.

13. a battery body including: an electrode assembly having first and second surfaces facing each other in a first direction, third and fourth surfaces facing each other in the second direction, and fifth and sixth surfaces facing each other in the third direction, the electrode assembly including a solid electrolyte, and a positive electrode and a negative electrode stacked in the second direction with the solid electrolyte sandwiched therebetween; a first margin portion disposed on the third surface of the electrode assembly; and a second margin portion disposed on the fourth surface of the electrode assembly; a first connection portion disposed on a first surface of the electrode assembly; a second connection portion disposed on a second surface of the electrode assembly, the first connection part includes a first current collecting electrode connected to the positive electrode and a first protection part disposed on the first current collecting electrode, the second connection part includes a second current collecting electrode connected to the negative electrode and a second protection part disposed on the second current collecting electrode, the first current collecting electrode is drawn out to one surface of the first connection part in a third direction, and an end of the first current collecting electrode on the other surface in the third direction is covered by the first protection part on the first surface of the electrode assembly; the second current collecting electrode is drawn out to one surface of the second connection part in a third direction, and an end of the second current collecting electrode on the other surface side in the third direction is covered by the second protection part on the second surface of the electrode assembly.

14. a first terminal electrode connected to the first collecting electrode and a second terminal electrode connected to the second collecting electrode, The all-solid-state battery according to claim 13 , wherein the first terminal electrode and the second terminal electrode are disposed spaced apart from each other on a surface from which the first current collecting electrode and the second current collecting electrode are drawn out.

15. The semiconductor device further includes a first terminal electrode connected to the first collecting electrode and a second terminal electrode connected to the second collecting electrode; 14. The all-solid-state battery of claim 13, wherein the first terminal electrode is connected to an end of the first current collecting electrode extended to one side in the third direction, and the second terminal electrode is connected to an end of the second current collecting electrode extended to one side in the third direction.

16. An all-solid-state battery as described in claim 15, wherein the first terminal electrode is arranged on a surface from which the first collecting electrode is pulled out, and the second terminal electrode is arranged on a surface from which the second collecting electrode is pulled out.

17. The all-solid-state battery according to claim 13 , wherein the first current collecting electrode and the second current collecting electrode are extended to opposite surfaces of the battery body in the third direction.

18. The all-solid-state battery according to claim 15 , wherein the length in the first direction is longer than the width in the second direction.

19. The all-solid-state battery according to claim 15 , wherein the length in the first direction is shorter than the width in the second direction.

20. the first protection portion is disposed to cover the entire surface of the first current collecting electrode in a first direction, The all-solid-state battery according to claim 2 , wherein the second protection portion is arranged to cover an entire surface of the second current collecting electrode in the first direction.

21. a first terminal electrode connected to the first collecting electrode and a second terminal electrode connected to the second collecting electrode, The all-solid-state battery according to claim 20 , wherein the first terminal electrode and the second terminal electrode are disposed spaced apart from each other on a surface from which the first current collecting electrode and the second current collecting electrode are drawn out.

22. 22. The all-solid-state battery according to claim 1, wherein the first current collecting electrode and the second current collecting electrode are extended to only one of both surfaces of the battery body in a third direction.

23. The all-solid-state battery according to claim 22 , wherein the first current collecting electrode and the second current collecting electrode are drawn out to a surface of the battery body that is mounted on an external substrate, among both surfaces of the battery body in a third direction.

24. The positive electrode includes a positive electrode current collector and a positive electrode active material. the negative electrode includes a negative electrode current collector and a negative electrode active material, 24. The all-solid-state battery according to claim 1 or 23, wherein an average length of the solid electrolyte layer is longer than an average length of the positive electrode active material, the negative electrode active material, the positive electrode current collector, and / or the negative electrode current collector.

25. 14. The all-solid-state battery according to claim 1, further comprising a solid electrolyte disposed at an end of the positive electrode in a direction toward the second connecting portion and / or an end of the negative electrode in a direction toward the first connecting portion.

26. The all-solid-state battery according to claim 1 or 13, further comprising an insulating member disposed at an end of the positive electrode in a direction toward the second connecting portion and / or an end of the negative electrode in a direction toward the first connecting portion.

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