Manufacturing method for all-solid-state battery

Abstract

To provide a manufacturing method for an all-solid-state battery that can reduce voids in a positive electrode composite formed by compressing a positive electrode active material powder and an electrolyte powder.SOLUTION: The present invention provides a manufacturing method for an all-solid-state battery, and the manufacturing method includes a mixture forming step of mixing a positive electrode active material powder coated with a lubricant material with an electrolyte powder to form a mixture, an application step of applying the mixture onto a positive electrode current collector, and a pressing step of pressing the mixture and the positive electrode current collector together.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing an all-solid-state battery, and more specifically to a method for manufacturing an all-solid-state battery that can reduce voids between a positive electrode active material (e.g., positive electrode active material powder) and an electrolyte (e.g., electrolyte powder). [Background technology]

[0002] An all-solid-state battery is a battery in which the electrolyte between the positive and negative electrodes of the battery has been replaced from the existing liquid to a solid.

[0003] In conventional batteries with liquid electrolytes, there is a risk of fire if the positive and negative electrodes come into contact. However, in solid-state batteries, the electrolyte through which lithium ions move is made solid, so the electrolyte and electrodes are always fixed in place, allowing the battery to operate normally without damage or explosion even when disturbances occur.

[0004] For example, Patent Document 1 discloses a binder-free all-solid-state battery, and discloses a method of injecting an active material in the form of a slurry into the voids of a carbon structure contained in a positive electrode. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Korean Patent Publication No. 10-2016-0060171

[0006] The invention disclosed in Patent Document 1 does not take into consideration voids formed in the cathode composite, which is a composite of the cathode active material powder and the electrolyte powder formed by compressing the cathode active material powder and the electrolyte powder.

[0007] Furthermore, the invention disclosed in Patent Document 1 requires a step of injecting a slurry-type active material into a positive electrode in which voids have already been formed, and a step of drying the injected active material, which poses a problem of reducing the mass production efficiency of all-solid-state batteries.

[0008] Furthermore, the invention disclosed in Patent Document 1 has a problem in that the density of the electrolyte mixed in the positive electrode decreases, which may result in a decrease in the performance of the all-solid-state battery. Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing an all-solid-state battery that can reduce voids in a positive electrode composite formed by compressing a positive electrode active material powder and an electrolyte powder.

[0010] Another object of the present invention is to provide a method for manufacturing an all-solid-state battery that can reduce the resistance in the all-solid-state battery and improve the performance of the all-solid-state battery by reducing voids in the positive electrode composite.

[0011] Another object of the present invention is to provide a method for manufacturing an all-solid-state battery that can improve the mass productivity of all-solid-state batteries. [Means for solving the problem]

[0012] In order to achieve the above-mentioned object, a first aspect of the present invention provides a method for manufacturing an all-solid-state battery, the method including a mixture forming step of mixing a cathode active material powder coated with a lubricant and an electrolyte powder to form a mixture, a coating step of applying the mixture onto a cathode current collector, and a pressing step of pressing the mixture and the cathode current collector together. According to the present invention, voids in a cathode composite, in which the cathode active material powder and the electrolyte powder are mixed, can be reduced by the lubricant.

[0013] The method may further include a coating step of coating the positive electrode active material powder with the lubricant before the mixture forming step. This may improve the mobility of the electrolyte powder within the positive electrode composite. Furthermore, mass production may be ensured because the positive electrode active material powder, which has been pre-coated with the lubricant, is simply pressed onto the electrolyte powder.

[0014] The lubricant may include a metal precursor and a sulfur precursor. That is, in the coating step, the metal precursor and the sulfur precursor may be sequentially or simultaneously chemically reacted on the surface of the positive active material powder to coat the surface of the positive active material powder. In the coating step, the metal precursor in powder form and the sulfur precursor in powder form may be mixed with the positive active material powder.

[0015] The metal precursor may be a compound containing at least one of molybdenum (Mo) and tungsten (W), and the sulfur precursor may be a compound containing sulfur (S).

[0016] The coating step may be performed in a reactor. The heat required for the chemical reaction during the coating step may be obtained by heating the reactor. Alternatively, the heat required for the chemical reaction may be obtained through heat (e.g., frictional heat) generated when the positive electrode active material powder, the metal precursor, and the sulfur precursor are mixed. Of course, the heat required for the chemical reaction may be obtained through both the heating of the reactor and the frictional heat.

[0017] In the mixture forming step, at least one of a binder and a conductive material may be further mixed.

[0018] The lubricating material may be at least one of molybdenum sulfide, tungsten sulfide, boron nitride, indium, Teflon, and graphite, which can reduce the voids while not impeding the movement of ions and electrons in the solid-state battery.

[0019] In the pressing step, a positive electrode composite layer may be formed by mixing a portion of the electrolyte powder with the positive electrode active material powder and pressing the mixture, and an electrolyte layer may be formed by pressing the electrolyte powder onto the positive electrode composite layer. Therefore, the lubricant may reduce voids in the positive electrode composite layer.

[0020] In the positive electrode compound layer, the electrolyte powder may be crushed and adhere to the surface of the positive electrode active material powder, and the lubricant may improve the mobility (freedom of movement) of the electrolyte powder adhering to the surface of the positive electrode active material powder.

[0021] A negative electrode active material may be disposed opposite the positive electrode active material with the electrolyte powder interposed therebetween, and a negative electrode current collector may be disposed on the negative electrode active material.

[0022] During the pressing step, the lubricant allows the electrolyte powder to slide around the positive electrode active material, thereby reducing voids in the positive electrode composite.

[0023] A method for manufacturing an all-solid-state battery according to another aspect of the present invention may include a mixture forming step of mixing a lubricant, a positive electrode active material powder, and an electrolyte powder to form a mixture; a coating step of coating the mixture on a positive electrode current collector; and a pressing step of pressing the mixture and the positive electrode current collector together. According to this aspect, the mobility (freedom of movement) of the electrolyte powder, which is crushed and attached to the periphery of the positive electrode active material powder, may be improved, and voids in the positive electrode composite may be reduced, resulting in improved performance of the all-solid-state battery. [Effects of the Invention]

[0024] According to the present invention, a method for manufacturing an all-solid-state battery can be provided that can reduce voids in a positive electrode composite formed by compressing a positive electrode active material powder and an electrolyte powder.

[0025] Furthermore, the present invention provides a method for manufacturing an all-solid-state battery that can reduce the resistance in the all-solid-state battery by reducing voids in the positive electrode composite, thereby improving the performance of the all-solid-state battery.

[0026] Furthermore, the present invention can provide a method for manufacturing an all-solid-state battery that can improve the mass productivity of all-solid-state batteries. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a conceptual diagram of an all-solid-state battery according to an embodiment of the present invention. [Figure 2] 1A to 1C are diagrams illustrating an example of a method for compressing a positive electrode active material and an electrolyte together. [Figure 3] FIG. 1(a) is a conceptual diagram showing voids formed in a positive electrode composite when a positive electrode active material powder and an electrolyte powder are compressed together, and FIG. 1(b) is a conceptual diagram showing voids formed in a positive electrode composite when a positive electrode active material powder coated with a lubricant and an electrolyte powder are compressed together. [Figure 4] 1 is a flowchart of a method for manufacturing an all-solid-state battery according to an embodiment of the present invention. [Figure 5] 1 is a flowchart of a method for manufacturing an all-solid-state battery according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, a method for manufacturing an all-solid-state battery according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings illustrate exemplary embodiments of the present invention, and are provided merely to further explain the present invention, and are not intended to limit the technical scope of the present invention.

[0029] Furthermore, regardless of the drawing symbols, identical or corresponding components will be given the same reference numerals, and duplicate descriptions thereof will be omitted. For the sake of convenience, the size and shape of each component shown in the drawings may be exaggerated or reduced.

[0030] Furthermore, in describing the present invention, if it is determined that a detailed description of related known technology may obscure the gist of the present invention, the detailed description of the known technology will be omitted.

[0031] FIG. 1 is a conceptual diagram of an all-solid-state battery according to an embodiment of the present invention.

[0032] Referring to FIG. 1 , an all-solid-state battery according to an embodiment of the present invention may include a positive electrode current collector 100, a positive electrode active material 200 on the positive electrode current collector 100, a negative electrode active material 400 on the positive electrode active material, an electrolyte 300 between the positive electrode active material 200 and the negative electrode active material 400, and a negative electrode current collector 500 on the negative electrode active material 400.

[0033] The positive electrode current collector 100 and the negative electrode current collector 500 serve to collect electrons generated by the electrochemical reaction of the active materials (positive electrode active material and negative electrode active material) or to supply electrons required for the electrochemical reaction.

[0034] The positive electrode active material 200 may be provided in a solid powder form and compressed with an electrolyte (e.g., a solid electrolyte) 300, which will be described later. For example, the positive electrode active material 200 and the electrolyte 300 may both be provided in a solid powder form, and the electrolyte 300 powder may be mixed on the positive electrode active material 200 powder, and the positive electrode active material 200 powder and the electrolyte 300 powder may then be compressed together.

[0035] The positive electrode active material 200 is a lithium-rich layered oxide (Li 1-X Ni X Mn X Co XO2), Iron Fluoride, Lithium Nickel Phosphate (LiNiPO4), Lithium Cobalt Phosphate (LiCoPO4), Lithium Vanadium Phosphate (Li3V2(PO4)3), Lithium Manganese Phosphate (LiMnPO4), Lithium Iron Phosphate (LiFePO4), Lithium Nickel Manganese Oxide (LiNi X Mn 2-X O4), Lithium Manganese Oxide (LiMn2O4), Lithium Nickel Cobalt Aluminum Oxide (NCA, LiNi X Co X Al Y O2), Lithium Nickel Manganese Cobalt Oxide (NMC, LiNi X Mn Y Co X The material may be formed of at least one of lithium cobalt oxide (LiCoO2) and lithium cobalt oxide (LiCoO2), or a compound of two or more of these.

[0036] The electrolyte 300 may be formed as a solid and may be supplied in powder form. That is, the solid electrolyte 300 powder may be supplied on the positive electrode active material 200 powder, and the positive electrode active material 200 powder and the electrolyte 300 powder may be pressed together. By pressing in this manner, at least a portion of the electrolyte 300 powder may be mixed into the spaces between the positive electrode active material 200 powder, and the remainder of the electrolyte 300 powder may be layered on the positive electrode active material 200 powder.

[0037] The electrolyte 300 is composed of lithium phosphorus sulfide (Li3PS4), lithium thiophosphate (Li7P3S 11 ), Argyrodite-type Li6PS5X (X = Cl, Br, I), Lithium Germanium Sulfide (Li 10 GeP2S 12 ), Lithium Tin Sulfide (Li 10 SnP2S 12 ), Lithium Antimony Sulfide (Li3SbS4), Lithium Boron Sulfide (Li2B6S 10 The electrode may be formed of at least one of lithium phosphorus oxynitride (LiPON), lithium phosphorus oxynitride (LiPON), and lithium super ionic conductor (LISICON).

[0038] The negative electrode active material 400 may be disposed on the electrolyte 300 facing the positive electrode active material 200. For example, the negative electrode active material 400 may be provided in the form of a solid film.

[0039] The negative electrode active material 400 may be formed of lithium, silicon, graphite, an Ag / CNT composite, or the like.

[0040] The positive electrode current collector 100 may be laminated on the outer surface of the positive electrode active material 200 , and the negative electrode current collector 500 may be laminated on the outer surface of the negative electrode active material 400 .

[0041] Meanwhile, the positive electrode active material 200 powder and the electrolyte 300 powder may be supplied onto the positive electrode current collector 100 before being pressed. FIG. 2 shows an example of such pressing.

[0042] 2, after a positive electrode active material 200 powder and an electrolyte 300 powder are supplied onto a positive electrode current collector 100, the positive electrode active material 200 powder and the electrolyte 300 powder on the positive electrode current collector 100 may be pressed together using a pair of rollers 700. Although the drawing shows separate layers of the positive electrode active material 200 powder and the electrolyte 300 powder, it is also possible to supply a pre-mixed mixture of the positive electrode active material 200 powder and the electrolyte 300 powder onto the positive electrode current collector 100 and then press them together using the pair of rollers 700.

[0043] Although not shown in the drawings, the mixture of the positive electrode active material 200 powder and the electrolyte 300 powder may further include at least one of a binder and a conductive material.

[0044] For example, the binder may be polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, a polymer containing ethylene oxide, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, acrylated styrene-butadiene rubber, epoxy resin, nylon, etc. The binder may be one of the above examples or a mixture of two or more of them.

[0045] For example, the conductive material may be ketjen black, carbon black, SuperC, SuperP, carbon nanotubes (CNT), vapor grown carbon fibers (VGCF), or the like.

[0046] Since such binders and conductive materials are well known, detailed description thereof will be omitted.

[0047] FIG. 2 shows an example in which a positive electrode active material 200 powder and an electrolyte 300 powder are pressed onto a positive electrode current collector 100 using a pair of rollers 700. However, other than pressing using rollers, known pressing methods such as surface pressing or vacuum pressing can also be used.

[0048] 1, when the positive electrode active material 200 powder and the electrolyte 300 powder are pressed together, a positive electrode compound layer may be formed, which is a mixture of the positive electrode active material 200 powder and the electrolyte 300 powder. The positive electrode compound layer may be formed in a form in which the electrolyte 300 powder is crushed and attached to the outer surface of the positive electrode active material 200 powder.

[0049] In such a positive electrode composite layer, a large number of voids C, which will be described below, may be formed. Such voids C may act as internal resistance and may be a factor in reducing the performance of the all-solid-state battery.

[0050] According to one embodiment of the present invention, voids C can be reduced by adding lubricating material 250 before or when the positive electrode active material 200 powder and the electrolyte 300 powder are pressed together.

[0051] For example, the lubricating material 250 may be formed of at least one of molybdenum sulfide, tungsten sulfide, boron nitride, indium, Teflon (registered trademark), and graphite, or a combination of two or more of these.

[0052] As shown in FIG. 1, according to one embodiment, the positive electrode active material 200 powder may be pre-coated with a solid lubricant 250 before the positive electrode active material 200 powder and the electrolyte 300 powder are pressed together.

[0053] Also, although not shown in the drawings, according to another embodiment, when the positive electrode active material 200 powder and the electrolyte 300 powder are pressed together, a solid lubricant material 250 may be supplied in addition to the positive electrode active material 200 powder and the electrolyte 300 powder.

[0054] When the positive electrode active material 200 powder and the electrolyte 300 powder are pressed together, the mobility (or degree of freedom of movement) of the electrolyte 300 powder can be increased by the lubricant 250. That is, even if the electrolyte 300 powder is crushed and adheres to the outer peripheral surface of the positive electrode active material 200 powder, the lubricant 250 allows the electrolyte 300 powder to move so as to fill the voids C.

[0055] FIG. 3 is a conceptual diagram showing a comparison of the difference in voids C between when no lubricant 250 is present and when lubricant 250 is added when positive electrode active material 200 powder and electrolyte 300 powder are pressed together.

[0056] Specifically, FIG. 3(a) shows voids in a positive electrode composite formed when a positive electrode active material powder and an electrolyte powder are compressed together, and FIG. 3(b) is a conceptual diagram showing voids in a positive electrode composite formed when a positive electrode active material powder coated with a lubricant and an electrolyte powder are compressed together.

[0057] Referring to FIG. 3(a), when the positive electrode active material 200 powder and the electrolyte 300 powder are pressed together without the lubricant 250, a relatively large number of voids C (with a relatively large volume) are formed in the pressed positive electrode composite (see FIG. 1).

[0058] On the other hand, referring to FIG. 3(b), when the lubricating material 250 is provided (for example, when the lubricating material 250 is coated on the positive electrode active material 200 powder), it can be seen that the number of voids C (or the volume of the voids C) is relatively reduced.

[0059] Thus, when the lubricating material 250 is provided (e.g., when the lubricating material 250 is coated on the positive electrode active material 200 powder) during compaction of the positive electrode active material 200 powder and the electrolyte 300 powder, the performance of the all-solid-state battery can be improved by reducing the voids C within the positive electrode composite.

[0060] Hereinafter, a method for manufacturing an all-solid-state battery according to an embodiment of the present invention will be described with reference to other drawings. Meanwhile, in describing the method for manufacturing an all-solid-state battery, it is obvious that the configuration of the all-solid-state battery described above can be equally applied to the method for manufacturing an all-solid-state battery.

[0061] FIG. 4 is a flowchart of a method for manufacturing an all-solid-state battery according to one embodiment of the present invention.

[0062] Referring to FIG. 4, a method for manufacturing an all-solid-state battery according to an embodiment of the present invention may include a mixture forming step (S20), a coating step (S30), and a pressing step (S40).

[0063] In the mixture forming step (S20), a mixture may be formed by mixing a powder of the positive electrode active material 200 coated with the lubricant 250 and a powder of the electrolyte 300. That is, the mixture is a mixture of a powder of the positive electrode active material 200 coated with the lubricant 250 and a powder of the electrolyte 300, and the mixture may further include at least one of a binder and a conductive material as previously disclosed.

[0064] In the mixture forming step (S20), the electrolyte 300 powder may be mixed with the positive electrode active material 200 powder, and at the same time, the electrolyte 300 powder may be disposed on the positive electrode active material 200 powder. That is, in the mixture forming step (S20), a portion of the electrolyte 300 powder may be mixed with the positive electrode active material 200 powder, and the remainder of the electrolyte 300 powder may be disposed on the positive electrode active material 200.

[0065] In the coating step (S30), the mixture may be coated on the positive electrode current collector 100 in a film form. That is, the mixture may be provided on the positive electrode current collector 100 for compression, which will be described later.

[0066] In the pressing step (S40), the mixture and the positive electrode current collector 100 may be pressed together. That is, in the pressing step (S40), the positive electrode active material 200 powder and the electrolyte 300 powder may be pressed together on the positive electrode current collector 100.

[0067] A positive electrode composite layer may be formed by a portion of the electrolyte 300 powder penetrating between the positive electrode active material 200 powder, and an electrolyte layer may be formed by pressing the remainder of the electrolyte 300 powder onto the positive electrode composite layer.

[0068] At this time, in the positive electrode compound layer, the electrolyte 300 powder may be crushed and adhered to the outer circumferential surface of the positive electrode active material 200, and the lubricant 250 may improve the mobility (or freedom of movement) of the electrolyte 300 powder.

[0069] That is, in the pressing step (S40), the lubricant 250 allows the electrolyte 300 powder to slide around the positive electrode active material 200 powder, thereby reducing voids in the positive electrode composite.

[0070] Therefore, reducing the voids C in the cathode composite formed by compressing the cathode active material 200 powder and the electrolyte 300 powder can improve the performance of all-solid-state batteries.

[0071] According to one embodiment of the present invention, a coating step (S10) may be further included before the mixture forming step (S20).

[0072] In the coating step (S10), the positive electrode active material 200 powder may be coated with a solid lubricant 250. When the electrolyte 300 powder is crushed and attached to the outer surface of the positive electrode active material 200 powder, the lubricant 250 may allow the electrolyte 300 powder to move and fill voids.

[0073] The lubricant may include a metal precursor and a sulfur precursor. That is, in the coating step, the metal precursor and the sulfur precursor may be sequentially or simultaneously chemically reacted on the surface of the positive active material powder to coat the surface of the positive active material powder. For example, the metal precursor powder and the sulfur precursor powder may be mixed with the positive active material powder and then chemically reacted.

[0074] In the coating step, a powder-form metal precursor and a powder-form sulfur precursor may be mixed with the positive electrode active material powder. For example, a chemical reaction between the metal precursor and the sulfur precursor may occur according to the following formula 1:

[0075] MoCl x +2H2S → MoS2 + 2HCl…(1)

[0076] The metal precursor may be a compound containing at least one of molybdenum (Mo) and tungsten (W), and the sulfur precursor may be a compound containing sulfur (S).

[0077] The coating step may be performed in a reactor (not shown). The heat required for the chemical reaction during the coating step may be obtained by heating the reactor. Alternatively, the heat required for the chemical reaction may be obtained by heat (e.g., frictional heat) generated when the positive electrode active material powder is mixed with the metal precursor and the sulfur precursor. Of course, the heat required for the chemical reaction may be obtained by both heating the reactor and frictional heat.

[0078] The negative electrode active material 400 may be disposed opposite the positive electrode active material 200, with the electrolyte 300 powder interposed therebetween. The negative electrode active material 400 may be formed in a film form. Then, the negative electrode current collector 500 may be disposed on the negative electrode active material 400.

[0079] Therefore, according to this embodiment, the performance of the all-solid-state battery can be improved by reducing the voids C in the positive electrode composite formed by compressing the positive electrode active material 200 powder and the electrolyte 300 powder. In addition, the mass productivity of the all-solid-state battery can be improved.

[0080] Meanwhile, according to another embodiment of the present invention, the lubricant 250 may not be pre-coated on the powder of the positive electrode active material 200. For example, the lubricant 250 may be mixed with the powder of the positive electrode active material 200 and the powder of the electrolyte 300 when they are mixed together before the pressing step. Hereinafter, a method for manufacturing an all-solid-state battery according to another embodiment of the present invention will be described with reference to other drawings.

[0081] 5 is a flowchart of a method for manufacturing an all-solid-state battery according to another embodiment of the present invention. This embodiment differs from the embodiment shown in FIG. 4 in that the lubricant 250 is not pre-coated on the cathode active material 200 powder, and the lubricant 250 is mixed with the cathode active material 200 powder and the electrolyte 300 powder when they are mixed together. The following description will focus on the differences from the embodiment shown in FIG. 4.

[0082] Referring to FIG. 5, the method for manufacturing an all-solid-state battery according to the present embodiment may include a mixture forming step (S100), a coating step (S200), and a pressing step (S300).

[0083] In the mixture forming step (S100), the positive electrode active material 200 powder, the electrolyte 300 powder, and the solid lubricant 250 (or lubricant powder) are mixed, and at the same time, the electrolyte 300 powder may be disposed on the positive electrode active material 200 powder. That is, in the mixture forming step (S100), a portion of the electrolyte 300 powder may be mixed with the positive electrode active material 200 powder and the lubricant 250, and the remainder of the electrolyte 300 powder may be disposed on the positive electrode active material 200.

[0084] In the coating step (S200), the mixture may be coated on the positive electrode current collector 100 in a film form. That is, the mixture may be provided on the positive electrode current collector 100 for compression bonding, which will be described later.

[0085] In the pressing step (S300), the mixture and the positive electrode current collector 100 may be pressed together. That is, in the pressing step (S300), the positive electrode active material 200 powder, the electrolyte 300, and the lubricant 250 (or lubricant powder) may be pressed together on the positive electrode current collector 100.

[0086] A positive electrode composite layer can be formed by a portion of the electrolyte 300 powder, together with the lubricant 250, penetrating between the positive electrode active material 200 powder, and an electrolyte layer can be formed by pressing the remainder of the electrolyte 300 powder onto the positive electrode composite layer.

[0087] At this time, in the positive electrode compound layer, the electrolyte 300 powder may be crushed and adhered to the outer circumferential surface of the positive electrode active material 200, and the lubricant 250 may improve the mobility (or freedom of movement) of the electrolyte 300 powder.

[0088] That is, in the pressing step (S300), the lubricant 250 allows the electrolyte 300 powder to slide around the positive electrode active material 200 powder, thereby reducing voids in the positive electrode composite.

[0089] Therefore, according to this embodiment, the performance of the all-solid-state battery can be improved by reducing the voids C in the positive electrode composite formed by compressing the positive electrode active material 200 powder and the electrolyte 300 powder. In addition, the mass productivity of the all-solid-state battery can be improved.

[0090] The preferred embodiments of the present invention described above have been disclosed for illustrative purposes only, and those skilled in the art with ordinary skill in the art may make various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes, and additions should be considered to fall within the scope of the following claims. [Explanation of symbols]

[0091] 100 Positive electrode current collector 200 Cathode active material 250 Lubricating substances 300 electrolytes 400 Anode active material 500 Negative electrode current collector 700 Roller

Claims

1. A method for manufacturing an all-solid-state battery, comprising: a mixture forming step of mixing the lubricant-coated positive electrode active material powder and the electrolyte powder to form a mixture; a coating step of coating the mixture on a positive electrode current collector; and a pressing step of pressing the mixture and the positive electrode current collector together; A method for manufacturing an all-solid-state battery, including:

2. The method for manufacturing an all-solid-state battery according to claim 1 , further comprising, before the mixture forming step, coating the positive electrode active material powder with the lubricating material.

3. The lubricating material may include a metal precursor and a sulfur precursor; 3. The method of claim 2, wherein in the coating step, the metal precursor and the sulfur precursor are sequentially or simultaneously chemically reacted on the surface of the positive electrode active material powder to coat the surface of the positive electrode active material powder.

4. The method for manufacturing an all-solid-state battery according to claim 1 , wherein at least one of a binder and a conductive material is further mixed in the mixture forming step.

5. 2. The method for manufacturing an all-solid-state battery according to claim 1, wherein the lubricating material is formed of at least one of molybdenum sulfide, tungsten sulfide, boron nitride, indium, Teflon, and graphite.

6. 2. The method of claim 1, wherein, in the pressing step, a cathode compound layer is formed by mixing a portion of the electrolyte powder with the cathode active material powder and pressing the mixture, and an electrolyte layer is formed by pressing the electrolyte powder on the cathode compound layer.

7. The method for manufacturing an all-solid-state battery according to claim 6 , wherein the electrolyte powder is crushed and adheres to the surface of the positive electrode active material powder within the positive electrode composite layer.

8. a negative electrode active material is disposed opposite the positive electrode active material powder with the electrolyte powder interposed therebetween; The method for producing an all-solid-state battery according to claim 1 , wherein a negative electrode current collector is disposed on the negative electrode active material.

9. 2. The method of claim 1, wherein, during the pressing, the lubricant causes the electrolyte powder to slide around the cathode active material powder, thereby reducing voids in the cathode composite.

10. A method for manufacturing an all-solid-state battery, comprising: a mixture forming step of mixing a lubricating material, a positive electrode active material powder, and an electrolyte powder to form a mixture; a coating step of coating the mixture on a positive electrode current collector; and a pressing step of pressing the mixture and the positive electrode current collector together; A method for manufacturing an all-solid-state battery, including:

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