Manufacturing method for all-solid-state batteries

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 the void between the positive electrode active material (e.g., positive electrode active material powder) and the electrolyte (e.g., electrolyte powder). [Background technology]

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

[0003] In conventional batteries where the electrolyte is liquid, 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 of solid material, so the electrolyte and electrodes are always fixed together and can operate normally without being damaged or exploding even when disturbances occur.

[0004] For example, Patent Document 1 discloses an all-solid-state battery that does not contain a binder, and discloses a method of injecting an active material in slurry form into the voids of a carbon structure contained in the positive electrode. [Prior art documents] [Patent Documents]

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

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

[0007] Furthermore, the invention disclosed in Patent Document 1 requires the steps of injecting an active material in slurry form into a positive electrode in which a void has already been formed, and drying the injected active material. Each of these steps has the problem of reducing the mass production efficiency of all-solid-state batteries.

[0008] Furthermore, the invention disclosed in Patent Document 1 has the problem that the density of the electrolyte mixed into the positive electrode decreases, which can result in a decrease in the performance of the all-solid-state battery. [Overview of the project] [Problems that the invention aims to solve]

[0009] The present invention aims to solve the above-mentioned problems and provides a method for manufacturing an all-solid-state battery that can reduce the voids in the positive electrode composite formed by the compression of positive electrode active material powder and electrolyte powder.

[0010] Furthermore, the present invention aims to provide a method for manufacturing an all-solid-state battery that can reduce resistance within the all-solid-state battery and improve the performance of the all-solid-state battery by reducing the voids within the positive electrode compound.

[0011] Furthermore, the present invention aims to provide a method for manufacturing all-solid-state batteries that can improve the mass-productivity of all-solid-state batteries. [Means for solving the problem]

[0012] A first aspect of the present invention provides a method for manufacturing an all-solid-state battery to achieve the above-mentioned objective, comprising: a mixture forming step of mixing a positive electrode active material powder and an electrolyte powder coated with a lubricating substance to form a mixture; a coating step of applying the mixture onto a positive electrode current collector; and a crimping step of pressing the mixture and the positive electrode current collector together. According to the present invention, the voids in the positive electrode composite, which is a mixture of the positive electrode active material powder and the electrolyte powder, can be reduced by the lubricating substance.

[0013] The process may further include a coating step in which the positive electrode active material powder is coated with the lubricating substance before the mixture formation step. This can improve the mobility (degrees of freedom of movement) of the electrolyte powder within the positive electrode compound. Furthermore, since it is only necessary to press the positive electrode active material powder, which has been pre-coated with the lubricating substance, with the electrolyte powder, mass production can be ensured.

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

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

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

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

[0018] The lubricating substance may be formed from at least one of molybdenum sulfide, tungsten sulfide, boron nitride, indium, Teflon®, and graphite. Therefore, it does not hinder the movement of ions and electrons in the all-solid-state battery and can reduce the voids.

[0019] In the crimping step, a positive electrode composite layer in which a part of the electrolyte powder is mixed with the positive electrode active material powder and crimped, and an electrolyte layer in which the electrolyte powder is crimped on the positive electrode composite layer can be formed. Therefore, the lubricant can reduce the voids in the positive electrode composite layer.

[0020] In the positive electrode composite layer, the electrolyte powder can be crushed and adhered to the surface of the positive electrode active material powder. Therefore, the lubricant can improve the mobility (degree of freedom of movement) of the electrolyte powder adhering to the surface of the positive electrode active material powder.

[0021] On the opposite side of the positive electrode active material, a negative electrode active material is disposed with the electrolyte powder interposed therebetween, and a negative electrode current collector can be disposed on the negative electrode active material.

[0022] In the crimping step, the lubricant can reduce the voids in the positive electrode composite by allowing the electrolyte powder to slide and move around the positive electrode active material.

[0023] A method for manufacturing an all-solid-state battery according to another aspect of the present invention includes 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 applying the mixture onto a positive electrode current collector; and a crimping step of crimping the mixture and the positive electrode current collector together. According to this aspect, the mobility (degree of freedom of movement) of the electrolyte powder that collapses and adheres around the positive electrode active material powder is improved, and the voids in the positive electrode composite can be reduced. As a result, the performance of the all-solid-state battery can be improved.

Effects of the Invention

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

[0025] Furthermore, according to the present invention, it is possible to provide a method for manufacturing an all-solid-state battery that can reduce resistance within the all-solid-state battery and improve the performance of the all-solid-state battery by reducing the voids within the positive electrode composite.

[0026] Furthermore, according to the present invention, it is possible to provide a method for manufacturing all-solid-state batteries that can improve the mass production capabilities of all-solid-state batteries. [Brief explanation of the drawing]

[0027] [Figure 1] This is a conceptual diagram of an all-solid-state battery according to an embodiment of the present invention. [Figure 2] This figure shows an example of a method for pressing together the positive electrode active material and the electrolyte. [Figure 3] (a) is a conceptual diagram showing the voids within the positive electrode compound formed when positive electrode active material powder and electrolyte powder are pressed together, and (b) is a conceptual diagram showing the voids within the positive electrode compound formed when positive electrode active material powder coated with a lubricant and electrolyte powder are pressed together. [Figure 4] This is a flowchart of a method for manufacturing an all-solid-state battery according to one embodiment of the present invention. [Figure 5] This is a flowchart of a method for manufacturing an all-solid-state battery according to another embodiment of the present invention. [Modes for carrying out 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 show exemplary embodiments of the present invention and are provided solely to illustrate the present invention in more detail, and do not limit the technical scope of the present invention.

[0029] Furthermore, regardless of the drawing reference numerals, identical or corresponding components will be assigned the same reference numeral, and redundant explanations will be omitted. For the sake of clarity, the size and shape of each illustrated component may be exaggerated or reduced.

[0030] Furthermore, in describing the present invention, if it is determined that a specific explanation of related known technologies may obscure the gist of the present invention, then detailed explanations related to known technologies will be omitted.

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

[0032] Referring to Figure 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 play the role of collecting electrons generated by the electrochemical reaction of the active materials (positive electrode active material and negative electrode active material) or supplying electrons necessary for the electrochemical reaction.

[0034] The positive electrode active material 200 is provided in solid powder form and can be pressed together with the electrolyte (e.g., solid electrolyte) 300, which will be described later. For example, both the positive electrode active material 200 and the electrolyte 300 are supplied in solid powder form, and the electrolyte 300 powder is mixed onto the positive electrode active material 200 powder, causing the positive electrode active material 200 powder and the electrolyte 300 powder to be pressed 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 O2), and at least one of Lithium Cobalt Oxide (LiCoO2), or can be formed of two or more of these compounds.

[0036] The electrolyte 300 can be formed as a solid and can be supplied in powder form. That is, the solid electrolyte 300 powder is supplied onto the positive electrode active material 200 powder, and the positive electrode active material 200 powder and the electrolyte 300 powder can be crimped to each other. By such crimping, at least a part of the electrolyte 300 powder can be mixed in the space between the positive electrode active material 200 powders, and the rest of the electrolyte 300 powder can be laminated onto the positive electrode active material 200 powder.

[0037] Electrolyte 300 contains lithium phosphorus sulfide (Li3PS4) and 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 It can be formed from at least one of the following: ), lithium phosphorus oxynitride (LiPON), and lithium superionic conductor (LISICON).

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

[0039] The negative electrode active material 400 can be formed from lithium, silicon, graphite, or an Ag / CNT composite, etc.

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

[0041] On the other hand, crimping can be performed with the positive electrode active material 200 powder and electrolyte 300 powder supplied onto the positive electrode current collector 100, and Figure 2 shows an example of such crimping.

[0042] Referring to Figure 2, with positive electrode active material 200 powder and electrolyte 300 powder supplied onto the positive electrode current collector 100, the positive electrode active material 200 powder and electrolyte 300 powder on the positive electrode current collector 100 can be pressed together through a pair of rollers 700. In the drawing, the layers of positive electrode active material 200 powder and electrolyte 300 powder are shown separately, but it is also possible to supply a pre-mixed mixture of positive electrode active material 200 powder and electrolyte 300 powder onto the positive electrode current collector 100 and press them together through a pair of rollers 700.

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

[0044] For example, the binder may be polyvinyl alcohol, carboxymethylcellulose, hydroxypropylcellulose, diacetylcellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, polymers containing ethylene oxide, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, acrylic styrene-butadiene rubber, epoxy resin, nylon, etc. One or more of the above-mentioned examples may be used as the binder.

[0045] For example, conductive materials such as Ketjen Black, Carbon Black, SuperC, SuperP, Carbon Nano Tubes (CNTs), and Vapor Grown Carbon Fiber (VGCFs) may be used.

[0046] Since such binders and conductive materials are already publicly known, a detailed explanation of them will be omitted.

[0047] Figure 2 shows an example of pressing the positive electrode active material 200 powder and electrolyte 300 powder onto the positive electrode current collector 100 via a pair of rollers 700. However, in addition to pressing with rollers, known pressing methods such as surface pressing or vacuum pressing can also be used.

[0048] As shown in Figure 1, when the positive electrode active material 200 powder and the electrolyte 300 powder are pressed together, a positive electrode composite layer can be formed in which the positive electrode active material 200 powder and the electrolyte 300 powder are mixed. The positive electrode composite layer can be formed in a form in which the electrolyte 300 powder is crushed and adhered to the outer surface of the positive electrode active material 200 powder.

[0049] Numerous voids C, as described below, can form in such positive electrode composite layers. These voids C act as internal resistance and can degrade the performance of the all-solid-state battery.

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

[0051] For example, the lubricating substance 250 may be formed from at least one or more compounds of molybdenum sulfide, tungsten sulfide, boron nitride, indium, Teflon®, and graphite.

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

[0053] Furthermore, although not shown in the drawings, according to other embodiments, when the positive electrode active material 200 powder and the electrolyte 300 powder are pressed together, a solid lubricating substance 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 lubricating substance 250 can increase the mobility (or degree of freedom of movement) of the electrolyte 300 powder. That is, even if the electrolyte 300 powder is crushed and adheres to the outer surface of the positive electrode active material 200 powder, the lubricating substance 250 can allow the electrolyte 300 powder to move to fill the void C.

[0055] Figure 3 is a conceptual diagram comparing the difference in void C when the positive electrode active material 200 powder and the electrolyte 300 powder are pressed together, with and without the lubricating material 250.

[0056] Specifically, Figure 3(a) shows the voids within the positive electrode compound formed when the positive electrode active material powder and the electrolyte powder are pressed together, and (b) is a conceptual diagram showing the voids within the positive electrode compound formed when the positive electrode active material powder coated with a lubricant and the electrolyte powder are pressed together.

[0057] Referring to Figure 3(a), it can be seen that when the positive electrode active material 200 powder and the electrolyte 300 powder are pressed together in the absence of the lubricating substance 250, a relatively large number of voids C (relatively large in volume) are formed within the positive electrode composite after pressing (see Figure 1).

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

[0059] Thus, when a lubricating substance 250 is provided during the bonding of the positive electrode active material 200 powder and the electrolyte 300 powder (for example, when the lubricating substance 250 is coated onto the positive electrode active material 200 powder), the performance of the all-solid-state battery can be improved by reducing the void C within the positive electrode compound.

[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. On the other hand, when 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 also be applied identically to the method for manufacturing an all-solid-state battery.

[0061] Figure 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 Figure 4, a method for manufacturing an all-solid-state battery according to one embodiment of the present invention may include a mixture formation step (S20), a coating step (S30), and a crimping step (S40).

[0063] In the mixture formation step (S20), a mixture can be formed by mixing the positive electrode active material 200 powder coated with the lubricating substance 250 and the electrolyte 300 powder. That is, the mixture is a mixture of the positive electrode active material 200 powder coated with the lubricating substance 250 and the electrolyte 300 powder, and the mixture may further contain at least one of the binders and conductive materials already disclosed.

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

[0065] In the coating step (S30), the above mixture may be applied onto the positive electrode current collector 100 in film form. That is, the above mixture may be provided onto the positive electrode current collector 100 for the crimping described later.

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

[0067] A positive electrode composite layer can be formed by a portion of the electrolyte 300 powder becoming embedded between the positive electrode active material 200 powder, and an electrolyte layer can be formed on the positive electrode composite layer by the remaining electrolyte 300 powder being pressed onto it.

[0068] In this case, in the positive electrode composite layer, the electrolyte 300 powder may adhere to the outer surface of the positive electrode active material 200 while being compressed, and the mobility (or degree of freedom of movement) of the electrolyte 300 powder may be improved by the lubricating substance 250.

[0069] In other words, during the crimping stage (S40), the lubricating substance 250 causes the electrolyte 300 powder to slide around the positive electrode active material 200 powder, thereby reducing the voids within the positive electrode compound.

[0070] Therefore, the performance of the all-solid-state battery can be improved by reducing the void C within the positive electrode composite formed by the compression of the positive electrode active material 200 powder and the electrolyte 300 powder.

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

[0072] In the coating stage (S10), a solid lubricant 250 can be coated onto the positive electrode active material 200 powder. When the electrolyte 300 powder adheres to the outer surface of the positive electrode active material 200 powder while being compressed, the lubricant 250 allows the electrolyte 300 powder to move to fill any voids.

[0073] The lubricating substance may include a metal precursor and a sulfur precursor. That is, in the coating stage, the metal precursor and sulfur precursor can be chemically reacted sequentially or simultaneously on the surface of the positive electrode active material powder, thereby coating the surface of the positive electrode active material powder. For example, the positive electrode active material powder can be mixed with the metal precursor powder and the sulfur precursor powder and then chemically reacted.

[0074] During the coating stage, a metal precursor and a sulfur precursor in powder form can be mixed with the cathode active material powder. For example, a chemical reaction between the metal precursor and the sulfur precursor can occur through 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). The sulfur precursor may be a compound containing sulfur (S).

[0077] The coating stage may be carried out in a reactor (not shown). The heat required for the chemical reaction in the coating stage can be obtained through heating of the reactor. Alternatively, the heat required for the chemical reaction can be obtained through the heat generated when the positive electrode active material powder, metal precursor, and sulfur precursor are mixed (e.g., frictional heat). Of course, the heat required for the chemical reaction can also be obtained through both heating of the reactor and frictional heat.

[0078] Opposite the positive electrode active material 200, a negative electrode active material 400 may be arranged with an electrolyte 300 powder interposed therebetween. The negative electrode active material 400 may be formed in the form of a film. A negative electrode current collector 500 may then be placed 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 void C in the positive electrode composite formed by the compression of the positive electrode active material 200 powder and the electrolyte 300 powder. Furthermore, the mass productivity of the all-solid-state battery can be improved.

[0080] On the other hand, according to another embodiment of the present invention, the lubricating substance 250 does not need to be pre-coated onto the positive electrode active material 200 powder. For example, when mixing the positive electrode active material 200 powder and the electrolyte 300 powder before the crimping step, the lubricating substance 250 can be mixed together. A method for manufacturing an all-solid-state battery according to another embodiment of the present invention will be described below with reference to other drawings.

[0081] Figure 5 is a flowchart of a manufacturing method for an all-solid-state battery according to another embodiment of the present invention. This embodiment differs from the embodiment shown in Figure 4 in that the lubricating substance 250 is not pre-coated to the positive electrode active material 200 powder, and the lubricating substance 250 is mixed together with the positive electrode active material 200 powder and the electrolyte 300 powder. The differences from the embodiment in Figure 4 will be explained below.

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

[0083] In the mixture formation 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 further placed on top of the positive electrode active material 200 powder. That is, in the mixture formation step (S100), a portion of the electrolyte 300 powder is mixed with the positive electrode active material 200 powder and the lubricant 250, and the remainder of the electrolyte 300 powder may be placed on top of the positive electrode active material 200.

[0084] In the coating step (S200), the above mixture may be applied onto the positive electrode current collector 100 in film form. That is, the above mixture may be provided onto the positive electrode current collector 100 for the crimping described later.

[0085] In the crimping step (S300), the above mixture and the positive electrode current collector 100 can be crimped together. That is, in the crimping step (S300), the positive electrode active material 200 powder, the electrolyte 300, and the lubricating material 250 (or lubricating material powder) can be crimped together on the positive electrode current collector 100.

[0086] A positive electrode composite layer can be formed when a portion of the electrolyte 300 powder, together with the lubricating substance 250, becomes embedded between the positive electrode active material 200 powder, and an electrolyte layer can be formed on the positive electrode composite layer by pressing the remaining electrolyte 300 powder onto it.

[0087] In this case, in the positive electrode composite layer, the electrolyte 300 powder may adhere to the outer surface of the positive electrode active material 200 while being compressed, and the mobility (or degree of freedom of movement) of the electrolyte 300 powder may be improved by the lubricating substance 250.

[0088] In other words, during the crimping stage (S300), the lubricating substance 250 causes the electrolyte 300 powder to slide around the positive electrode active material 200 powder, thereby reducing the voids within the positive electrode compound.

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

[0090] The preferred embodiments of the present invention described above are disclosed for illustrative purposes only, and a person skilled in the art with ordinary skill in the invention will be able to make various modifications, changes, and additions within the spirit and scope of the 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 Rollers

Claims

1. A method for manufacturing an all-solid-state battery, A mixture formation step involves mixing a positive electrode active material powder coated with a lubricant and an electrolyte powder to form a mixture; A coating step of applying the mixture onto a positive electrode current collector; and A crimping step in which the mixture and the positive electrode current collector are crimped together; Includes, A method for manufacturing an all-solid-state battery, characterized in that, in the crimping step, the electrolyte powder slides around the positive electrode active material powder due to the lubricant, thereby reducing the voids within the positive electrode composite.

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

3. The lubricating substance may include a metal precursor and a sulfur precursor. The method for manufacturing an all-solid-state battery according to claim 2, wherein in the coating step, the metal precursor and the sulfur precursor are chemically reacted sequentially or simultaneously on the surface of the positive electrode active material powder, thereby coating 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 the binder and the conductive material is further mixed in the mixture formation step.

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

6. The method for manufacturing an all-solid-state battery according to claim 1, wherein in the crimping step, a positive electrode composite layer is formed by mixing a portion of the electrolyte powder with the positive electrode active material powder and crimping them together, and an electrolyte layer is formed on the positive electrode composite layer by crimping the electrolyte powder together.

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. Opposite the positive electrode active material powder, the negative electrode active material is arranged with the electrolyte powder in between. A method for manufacturing an all-solid-state battery according to claim 1, wherein a negative electrode current collector is arranged on the negative electrode active material.

9. A method for manufacturing an all-solid-state battery, A mixture formation step in which a lubricant, positive electrode active material powder, and electrolyte powder are mixed to form a mixture; A coating step of applying the mixture onto a positive electrode current collector; and A crimping step in which the mixture and the positive electrode current collector are crimped together; Includes, A method for manufacturing an all-solid-state battery, characterized in that, in the crimping step, the electrolyte powder slides around the positive electrode active material powder due to the lubricant, thereby reducing the voids within the positive electrode composite.

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