Method for manufacturing all-solid-state battery

Abstract

The present invention provides a method for manufacturing an all-solid-state battery, comprising: a mixture forming step of mixing a powder of a positive electrode active material coated with a lubricating material and a powder of an electrolyte 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. According to the invention, pores in the positive electrode composite material layer formed in the pressing step can be reduced, so that the performance of the all-solid-state battery can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a manufacturing method of an all-solid-state battery, and more particularly, to a manufacturing method of an all-solid-state battery capable of reducing pores between a cathode active material (e.g., a powder of a cathode active material) and an electrolyte (e.g., a powder of an electrolyte). BACKGROUND

[0002] An all-solid-state battery is a battery in which an electrolyte between a cathode and an anode of the battery is replaced from a conventional liquid to a solid.

[0003] In a general conventional battery including a liquid electrolyte, there is a risk of fire if the cathode and the anode meet. However, since the electrolyte in which lithium ions move in the all-solid-state battery is formed of a solid, the electrolyte and the electrode always remain fixed and can operate normally even if disturbed, without being damaged or exploding.

[0004] For example, Korean Patent Laid-Open No. 10-2016-0060171 (hereinafter referred to as "prior art document") discloses an all-solid-state battery not containing a binder and a method of injecting an active material in the form of a slurry into pores of a carbon structure included in a cathode.

[0005] The invention disclosed in the prior art document does not consider pores formed in a cathode composite that is a composite of a powder of a cathode active material and a powder of an electrolyte, which is pressed from the powder of the cathode active material and the powder of the electrolyte.

[0006] In addition, the invention disclosed in the prior art document requires a process of injecting an active material in the form of a slurry into a cathode in which pores have been formed and a process of drying the injected active material. These processes reduce the mass production efficiency of the all-solid-state battery.

[0007] In addition, the invention disclosed in the prior art document has a problem in that the density of the electrolyte mixed into the cathode can be reduced, thereby causing a decrease in the performance of the all-solid-state battery.

[0008] PRIOR ART DOCUMENT

[0009] PATENT DOCUMENT

[0010] Patent Document 0001: Korean Patent Laid-Open No. 10-2016-0060171 SUMMARY

[0011] PROBLEMS TO BE SOLVED BY THE INVENTION

[0012] The present application aims at solving the above problems, and has an object to provide a manufacturing method of an all-solid-state battery which can reduce pores in a cathode composite made by pressing a powder of a cathode active material and a powder of an electrolyte.

[0013] Further, the present application has an object to provide a manufacturing method of an all-solid-state battery which can reduce pores in a cathode composite, thereby reducing the resistance in the all-solid-state battery and improving the performance of the all-solid-state battery.

[0014] Further, the present application has an object to provide a manufacturing method of an all-solid-state battery which can improve the mass productivity of the all-solid-state battery.

[0015] Means for solving the problems

[0016] The present application aims at achieving the above objects, and provides a manufacturing method of an all-solid-state battery, including: a mixture forming step of mixing a powder of a cathode active material coated with a lubricating material and a powder of an electrolyte to form a mixture; a coating step of coating the mixture on a cathode current collector; and a pressing step of pressing the mixture and the cathode current collector. According to the present application, pores in a cathode composite made by mixing a powder of a cathode active material and a powder of an electrolyte can be reduced by the lubricating material.

[0017] The manufacturing method of an all-solid-state battery can further include a coating step of coating the lubricating material on the powder of the cathode active material before the mixture forming step. Thus, the mobility (degree of freedom of movement) of the powder of the electrolyte in the cathode composite can be improved. Further, since the powder of the cathode active material pre-coated with the lubricating material and the powder of the electrolyte are only pressed, the mass productivity can be ensured.

[0018] The lubricating material can include a metal precursor and a sulfur precursor. That is, in the coating step, the metal precursor and the sulfur precursor are sequentially or simultaneously chemically reacted on the surface of the powder of the cathode active material so as to be coated on the surface of the powder of the cathode active material. In the coating step, the metal precursor in the form of a powder and the sulfur precursor in the form of a powder can be mixed with the powder of the cathode active material.

[0019] The metal precursor can be a compound including at least one of molybdenum (Mo) and tungsten (W). Further, the sulfur precursor can be a compound including sulfur (S).

[0020] The coating step can be performed in a reactor. The heat required for the chemical reaction in the coating step can be obtained by heating the reactor. Alternatively, the heat required for the chemical reaction can be obtained by the heat generated when the powder of the positive electrode active material is mixed with the metal precursor and the sulfur precursor (e.g., frictional heat). Of course, the heat required for the chemical reaction can also be obtained by both heating the reactor and the frictional heat.

[0021] In the mixture forming step, at least one of the adhesive and the conductive material may also be mixed.

[0022] The lubricating material can be formed from at least one of molybdenum sulfide, tungsten sulfide, boron nitride, indium, Teflon, and graphite. Therefore, the porosity can be reduced without hindering the movement of ions and electrons in the all-solid-state battery.

[0023] In the pressing step, a portion of the electrolyte powder can be mixed with the positive electrode active material powder and pressed to form a positive electrode composite material layer, and electrolyte powder can be pressed onto the positive electrode composite material layer to form an electrolyte layer. Therefore, the porosity in the positive electrode composite material layer can be reduced by the lubricating material.

[0024] In the positive electrode composite material layer, the electrolyte powder can be crushed and adhered to the surface of the positive electrode active material powder. Therefore, the lubricating material can improve the mobility (degrees of freedom of movement) of the electrolyte powder adhering to the surface of the positive electrode active material powder.

[0025] The negative electrode active material is configured to face the positive electrode active material when the electrolyte powder is placed between the positive electrode active material and the negative electrode active material, and a negative electrode current collector may be provided on the negative electrode active material.

[0026] During the pressing step, the electrolyte powder slides around the positive electrode active material due to the lubricating material, thereby reducing the porosity in the positive electrode composite material.

[0027] A method for manufacturing an all-solid-state battery according to another embodiment of the present invention may include: a mixture forming step, wherein a powder of a lubricating material, a powder of a positive electrode active material, and a powder of an electrolyte are mixed to form a mixture; a coating step, wherein the mixture is coated onto a positive electrode current collector; and a pressing step, wherein the mixture and the positive electrode current collector are pressed. According to this embodiment, by increasing the mobility (degrees of freedom of movement) of the electrolyte powder that is flattened and adheres to the powder of the positive electrode active material, the porosity in the positive electrode composite material can be reduced, resulting in improved performance of the all-solid-state battery.

[0028] Invention Effects

[0029] According to the present invention, a method for manufacturing an all-solid-state battery can be provided, which can reduce the porosity in a positive electrode composite material formed by pressing together powder of positive electrode active material and powder of electrolyte.

[0030] In addition, according to the present invention, a method for manufacturing an all-solid-state battery can be provided, which can reduce the resistance of the all-solid-state battery and improve the performance of the all-solid-state battery by reducing the porosity in the positive electrode composite material.

[0031] In addition, according to the present invention, a method for manufacturing an all-solid-state battery can be provided, which can improve the mass production rate of all-solid-state batteries. Attached Figure Description

[0032] Figure 1 This is a conceptual diagram of an all-solid-state battery according to an embodiment of the present invention.

[0033] Figure 2 This is an embodiment of a method for pressing positive electrode active material and electrolyte.

[0034] Figure 3A This is a conceptual diagram illustrating the pores in a cathode composite material formed when powders of the positive electrode active material and electrolyte powder are pressed together. Figure 3B This is a conceptual diagram illustrating the pores in a positive electrode composite material formed when powders of a positive electrode active material coated with lubricating material and powders of an electrolyte are pressed together.

[0035] Figure 4 This is a flowchart illustrating a method for manufacturing an all-solid-state battery according to an embodiment of the present invention.

[0036] Figure 5 This is a flowchart illustrating a method for manufacturing an all-solid-state battery according to another embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures

[0038] 100: Positive current collector

[0039] 200: Positive electrode active material

[0040] 250: Lubricating materials

[0041] 300: Electrolyte

[0042] 400: Negative electrode active material

[0043] 500: Negative current collector

[0044] 700: Roller Detailed Implementation

[0045] 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 drawings illustrate exemplary forms of the invention and are provided for the purpose of describing the invention in more detail, but are not intended to limit the scope of the invention.

[0046] Furthermore, regardless of the reference numerals used, the same or corresponding constituent elements are indicated by the same reference numerals, and repeated descriptions will be omitted. For ease of description, the size and shape of the constituent elements shown may be exaggerated or reduced.

[0047] Furthermore, in describing the present invention, if it is determined that a detailed description of the known technology may obscure the main points of the present invention, a detailed description of the relevant known technology will be omitted.

[0048] Figure 1 This is a conceptual diagram of an all-solid-state battery according to an embodiment of the present invention.

[0049] Reference Figure 1 According to an embodiment of the present invention, the all-solid-state battery may include a positive current collector 100, a positive active material 200 on the positive current collector 100, a negative active material 400 on the positive active material, an electrolyte 300 between the positive active material 200 and the negative active material 400, and a negative current collector 500 on the negative active material 400.

[0050] The positive current collector 100 and the negative current collector 500 respectively serve to collect electrons generated by the electrochemical reaction of the active materials (positive active material and negative active material) or to supply electrons required for the electrochemical reaction.

[0051] The positive electrode active material 200 can be provided in the form of a solid powder and pressed together with an electrolyte (e.g., a solid electrolyte) 300, as described later. For example, the positive electrode active material 200 and the electrolyte 300 can be provided in the form of solid powders, the electrolyte 300 powder can be mixed on the powder of the positive electrode active material 200, and the powder of the positive electrode active material 200 and the powder of the electrolyte 300 can be pressed together.

[0052] The positive electrode active material 200 can be composed of lithium-rich layered oxides (Li... 1-X Ni X Mn X C OXO2), 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 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 It forms a compound consisting of at least one or more of O2 and lithium cobalt oxide (LiCoO2).

[0053] The electrolyte 300 can be formed as a solid or provided in powder form. That is, the solid electrolyte 300 powder can be provided onto the positive electrode active material 200 powder, and the positive electrode active material 200 powder and the electrolyte 300 powder can be pressed together. Through such pressing, at least a portion of the electrolyte 300 powder can be mixed in the space between the positive electrode active material 200 powders, and the remaining portion of the electrolyte 300 powder can be stacked on top of the positive electrode active material 200 powder.

[0054] The electrolyte 300 can be composed of lithium phosphorus sulfide (Li3PS4) or lithium thiophosphate (Li7P3S4). 11Argyrodite-type Li6PS5X (X = Cl, Br, I), and lithium-germanium sulfide (Li 10 GeP2S 12 Lithium tin sulfide (Li 10 SnP2S 12 Lithium antimony sulfide (Li3SbS4) and lithium boron sulfide (Li2B6S) 10 It is formed by at least one of lithium phosphorus oxynitride (LiPON) and lithium super ion conductor (LISICON).

[0055] The negative electrode active material 400 can be disposed on the electrolyte 300 in a manner opposite to the positive electrode active material 200. For example, the negative electrode active material 400 can be provided in the form of a solid film.

[0056] The negative electrode active material 400 can be formed from lithium, silicon, graphite, or Ag / CNT complex, etc.

[0057] The positive current collector 100 can be stacked on the outer surface of the positive active material 200, and the negative current collector 500 can be stacked on the outer surface of the negative active material 400.

[0058] On the other hand, pressing can be performed while the powder of the positive electrode active material 200 and the powder of the electrolyte 300 are provided on the positive electrode current collector 100. Figure 2 An example of such compression is shown.

[0059] Reference Figure 2 With the powders of positive electrode active material 200 and electrolyte 300 provided onto the positive electrode current collector 100, the powders of positive electrode active material 200 and electrolyte 300 on the positive electrode current collector 100 can be pressed by a pair of rollers 700. The figure shows the layers of powders of positive electrode active material 200 and electrolyte 300 separated, but a pre-mixed mixture of powders of positive electrode active material 200 and electrolyte 300 can also be provided onto the positive electrode current collector 100 and pressed by a pair of rollers 700.

[0060] Although not shown, the mixture of the powder of positive electrode active material 200 and the powder of electrolyte 300 may also include at least one of a binder and a conductive material.

[0061] For example, the adhesive may be polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, polymers containing ethylene oxide, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, styrene-butadiene acrylic rubber, epoxy resin, and nylon, etc. One or more mixtures of the above examples may be used as the adhesive.

[0062] For example, Ketjen Black, Carbon Black, SuperC, SuperP, Carbon Nano Tube (CNT), Vapor Grown Carbon Fiber (VGCF) and other conductive materials can be used.

[0063] The adhesive and conductive material are known, so their detailed descriptions will be omitted.

[0064] Figure 2 An example is shown of pressing powder of positive electrode active material 200 and powder of electrolyte 300 onto positive electrode current collector 100 by a pair of rollers 700, but in addition to using roller pressing, known pressing methods such as surface pressing or vacuum pressing can also be used.

[0065] like Figure 1 As shown, when the powder of positive electrode active material 200 and the powder of electrolyte 300 are pressed, a positive electrode composite material layer mixed with the powder of positive electrode active material 200 and the powder of electrolyte 300 can be formed. The positive electrode composite material layer can be formed in the form that the powder of electrolyte 300 is flattened and attached to the outer peripheral surface of the powder of positive electrode active material 200.

[0066] Multiple pores C (described below) can be formed in the positive electrode composite material layer. These pores C act as internal resistance and may become a factor that reduces the performance of the all-solid-state battery.

[0067] According to one embodiment of the present invention, a lubricating material 250 may be added before or during pressing of the powder of positive electrode active material 200 and the powder of electrolyte 300 to reduce the porosity C.

[0068] For example, the lubricating material 250 may be formed from at least one or a compound of two or more of molybdenum sulfide, tungsten sulfide, boron nitride, indium, Teflon, and graphite.

[0069] like Figure 1 As shown, according to one embodiment, the solid lubricating material 250 can be pre-coated onto the powder of the positive electrode active material 200 before the powder of the positive electrode active material 200 and the powder of the electrolyte 300 are pressed.

[0070] Additionally, although not shown, according to another embodiment, when pressing the powder of the positive electrode active material 200 and the powder of the electrolyte 300, a solid lubricating material 250 may also be provided in addition to the powder of the positive electrode active material 200 and the powder of the electrolyte 300.

[0071] When the powder of the positive electrode active material 200 and the powder of the electrolyte 300 are pressed, the mobility (or degree of freedom of movement) of the powder of the electrolyte 300 can be increased by the lubricating material 250. That is, even if the powder of the electrolyte 300 is flattened and adheres to the outer peripheral surface of the powder of the positive electrode active material 200, the powder of the electrolyte 300 can still move due to the lubricating material 250 to fill the pores C.

[0072] Figure 3A and Figure 3B This is a conceptual diagram comparing the difference in pore size C when the powder of positive electrode active material 200 and the powder of electrolyte 300 are pressed, with and without the addition of lubricating material 250.

[0073] Specifically, Figure 3A This diagram illustrates a concept of the pores in a cathode composite material formed when powders of the positive electrode active material and electrolyte are pressed together. Figure 3B This is a conceptual diagram illustrating the pores in a positive electrode composite material formed when powders of a positive electrode active material coated with lubricating material and powders of an electrolyte are pressed together.

[0074] Reference Figure 3A It can be seen that when the powders of positive electrode active material 200 and electrolyte 300 are pressed without lubricating material 250, the pressed positive electrode composite material (refer to...) Figure 1 The pores (relatively large in volume) are formed in the pores.

[0075] Conversely, refer to Figure 3BIt is known that when lubricating material 250 is provided (for example, when lubricating material 250 is coated on the powder of positive electrode active material 200), the number of pores C (or the volume of pores C) is relatively reduced.

[0076] As described above, if a lubricating material 250 is provided when pressing the powder of the positive electrode active material 200 and the powder of the electrolyte 300 (for example, if the lubricating material 250 is coated on the powder of the positive electrode active material 200), the porosity C in the positive electrode composite material is reduced, thereby improving the performance of the all-solid-state battery.

[0077] The manufacturing method of an all-solid-state battery according to an embodiment of the present invention will now be described with reference to other accompanying drawings. On the other hand, when describing the manufacturing method of an all-solid-state battery, it is obvious that the above-described configuration of the all-solid-state battery can also be applied to the manufacturing method of the all-solid-state battery.

[0078] Figure 4 This is a flowchart illustrating a method for manufacturing an all-solid-state battery according to an embodiment of the present invention.

[0079] Reference Figure 4 According to an embodiment of the present invention, a method for manufacturing an all-solid-state battery may include a mixture forming step (S20), a coating step (S30), and a pressing step (S40).

[0080] In the mixture forming step (S20), the powder of the positive electrode active material 200 coated with lubricating material 250 and the powder of electrolyte 300 can be mixed to form a mixture. That is, the mixture is a mixture of the powder of the positive electrode active material 200 coated with lubricating material 250 and the powder of electrolyte 300, and the mixture may also include at least one of a known binder and a conductive material.

[0081] In the mixture formation step (S20), the electrolyte 300 powder can be mixed into the positive electrode active material 200 powder, and the electrolyte 300 powder can also be disposed on the positive electrode active material 200 powder. That is, in the mixture formation step (S20), a portion of the electrolyte 300 powder can be mixed with the positive electrode active material 200 powder, and the remaining portion of the electrolyte 300 powder can be disposed on the positive electrode active material 200.

[0082] In the coating step (S30), the mixture can be coated onto the positive current collector 100 in the form of a film. That is, the mixture can be provided onto the positive current collector 100 for pressing (described below).

[0083] In the pressing step (S40), the mixture and the positive electrode current collector 100 can be pressed. That is, in the pressing step (S40), the powder of the positive electrode active material 200 and the powder of the electrolyte 300 can be pressed onto the positive electrode current collector 100.

[0084] A portion of the electrolyte 300 powder can enter between the powders of the positive electrode active material 200 to form a positive electrode composite material layer, and the remaining portion of the electrolyte 300 powder can be pressed onto the positive electrode composite material layer to form an electrolyte layer.

[0085] At this time, in the positive electrode composite material layer, the powder of the electrolyte 300 can be flattened and attached to the outer peripheral surface of the positive electrode active material 200, and the mobility (or degree of freedom of movement) of the powder of the electrolyte 300 can be improved by the lubricating material 250.

[0086] That is, in the pressing step (S40), the powder of the electrolyte 300 slides around the powder of the positive electrode active material 200 by the lubricating material 250, thereby reducing the porosity in the positive electrode composite material.

[0087] Therefore, the porosity C in the positive electrode composite material formed by pressing the powder of the positive electrode active material 200 and the powder of the electrolyte 300 can be reduced, thereby improving the performance of the all-solid-state battery.

[0088] According to one embodiment of the present invention, a coating step (S10) may be included before the mixture forming step (S20).

[0089] In the coating step (S10), the solid lubricating material 250 can be coated onto the powder of the positive electrode active material 200. When the powder of the electrolyte 300 is flattened and adheres to the outer peripheral surface of the powder of the positive electrode active material 200, the powder of the electrolyte 300 can be moved by the lubricating material 250 to fill the pores.

[0090] The lubricating material may include a metal precursor and a sulfur precursor. That is, in the coating step, the metal precursor and the sulfur precursor may react chemically on the surface of the positive electrode active material powder sequentially or simultaneously to coat the surface of the positive electrode active material powder. For example, the metal precursor powder and the sulfur precursor powder may be mixed in the positive electrode active material powder and then reacted chemically.

[0091] In the coating step, the metal precursor and the sulfur precursor in powder form can be mixed with the powder of the positive electrode active material. For example, the chemical reaction between the metal precursor and the sulfur precursor can be achieved by the following chemical formula 1.

[0092] Chemical formula 1: MoCl X +2H₂S->MoS₂+2HCl

[0093] The metal precursor may be a compound containing at least one of molybdenum (Mo) and tungsten (W). Additionally, the sulfur precursor may be a compound containing sulfur (S).

[0094] The coating step can be carried out in a reactor (not shown). The heat required for the chemical reaction in the coating step can be obtained by heating the reactor. Alternatively, the heat required for the chemical reaction can be obtained by the heat generated when the powder of the positive electrode active material is mixed with the metal precursor and the sulfur precursor (e.g., frictional heat). Of course, the heat required for the chemical reaction can also be obtained by both heating the reactor and the frictional heat.

[0095] The negative electrode active material 400 is configured to face the positive electrode active material 200 when the powder of the electrolyte 300 is placed between the positive electrode active material 200 and the negative electrode active material 400. The negative electrode active material 400 can be formed in the form of a film. Furthermore, the negative electrode current collector 500 can be disposed on the negative electrode active material 400.

[0096] Therefore, according to this embodiment, the porosity C in the positive electrode composite material formed by pressing the powder of the positive electrode active material 200 and the powder of the electrolyte 300 is reduced, thereby improving the performance of the all-solid-state battery. Furthermore, the mass production rate of all-solid-state batteries can be increased.

[0097] On the other hand, according to another embodiment of the present invention, the lubricating material 250 may not need to be pre-coated onto the powder of the positive electrode active material 200. For example, the lubricating material 250 may be mixed together with the powder of the positive electrode active material 200 and the powder of the electrolyte 300 before the pressing step. A method for manufacturing an all-solid-state battery according to another embodiment of the present invention will now be described with reference to other accompanying drawings.

[0098] Figure 5 This is a flowchart illustrating a method for manufacturing an all-solid-state battery according to another embodiment of the present invention. This embodiment is related to... Figure 4 The difference in the illustrated embodiment is that the lubricant 250 is not pre-coated onto the powder of the positive electrode active material 200; instead, the lubricant 250 is mixed together with the powder of the positive electrode active material 200 and the powder of the electrolyte 300. The following will focus on describing... Figure 4 The differences between the embodiments.

[0099] Reference Figure 5The manufacturing method of the all-solid-state battery according to this embodiment may include a mixture forming step (S100), a coating step (S200), and a pressing step (S300).

[0100] In the mixture forming step (S100), the powder of the positive electrode active material 200, the powder of the electrolyte 300, and the solid lubricating material 250 (or the powder of the lubricating material) can be mixed, and the powder of the electrolyte 300 can also be disposed on the powder of the positive electrode active material 200. That is, in the mixture forming step (S100), a portion of the powder of the electrolyte 300 can be mixed with the powder of the positive electrode active material 200 and the lubricating material 250, and the remaining portion of the powder of the electrolyte 300 can be disposed on the positive electrode active material 200.

[0101] In the coating step (S200), the mixture can be coated onto the positive current collector 100 in the form of a film. That is, the mixture can be provided onto the positive current collector 100 for pressing (described below).

[0102] In the pressing step (S300), the mixture and the positive electrode current collector 100 can be pressed. That is, in the pressing step (S300), the powder of the positive electrode active material 200, the electrolyte 300, and the lubricating material 250 (or the powder of the lubricating material) can be pressed on the positive electrode current collector 100.

[0103] A portion of the electrolyte 300 powder may be incorporated together with the lubricating material 250 into the spaces between the positive electrode active material 200 powder to form a positive electrode composite material layer, and the remaining portion of the electrolyte 300 powder may be pressed onto the positive electrode composite material layer to form an electrolyte layer.

[0104] At this time, in the positive electrode composite material layer, the powder of the electrolyte 300 can be flattened and attached to the outer peripheral surface of the positive electrode active material 200, and the mobility (or degree of freedom of movement) of the powder of the electrolyte 300 can be improved by the lubricating material 250.

[0105] That is, in the pressing step (S300), the powder of the electrolyte 300 slides around the powder of the positive electrode active material 200 through the lubricating material 250, thereby reducing the porosity in the positive electrode composite material.

[0106] Therefore, according to this embodiment, the porosity C in the positive electrode composite material formed by pressing the powder of the positive electrode active material 200 and the powder of the electrolyte 300 is reduced, thereby improving the performance of the all-solid-state battery. Furthermore, the mass production rate of all-solid-state batteries can be increased.

[0107] The preferred embodiments of the present invention described above are for illustrative purposes only. Those skilled in the art will understand that various modifications, variations, and additions can be made within the spirit and scope of the present invention, and such modifications, variations, and additions fall within the protection scope of the appended claims.

Claims

1. A method for manufacturing an all-solid-state battery, wherein, include: The mixture formation step involves mixing powder of a positive electrode active material coated with a lubricating material and powder of an electrolyte to form a mixture; The coating step involves coating the mixture onto the positive current collector; as well as The pressing step involves pressing the mixture and the positive current collector.

2. The method for manufacturing an all-solid-state battery according to claim 1, wherein, Prior to the mixture formation step, a coating step is included, in which the lubricating material is coated onto the powder of the positive electrode active material.

3. The method for manufacturing an all-solid-state battery according to claim 2, wherein, The lubricating material includes a metal precursor and a sulfur precursor. 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 in order 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, In the mixture forming step, at least one of the adhesive and the conductive material is also mixed.

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

6. The method for manufacturing an all-solid-state battery according to claim 1, wherein, In the pressing step, a portion of the electrolyte powder is mixed with the positive electrode active material powder and pressed to form a positive electrode composite material layer, and electrolyte powder is pressed onto the positive electrode composite material layer to form an electrolyte layer.

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

8. The method for manufacturing an all-solid-state battery according to claim 1, wherein, The negative electrode active material is configured to face the positive electrode active material when the electrolyte powder is placed between the positive electrode active material and the negative electrode active material. A negative current collector is disposed on the negative electrode active material.

9. The method for manufacturing an all-solid-state battery according to claim 1, wherein, During the pressing step, the electrolyte powder slides around the positive electrode active material due to the lubricating material, thereby reducing the porosity in the positive electrode composite material.

10. A method for manufacturing an all-solid-state battery, wherein, include: The mixture formation step involves mixing powders of lubricating material, positive electrode active material, and electrolyte to form a mixture; The coating step involves coating the mixture onto the positive current collector; as well as The pressing step involves pressing the mixture and the positive current collector.

Images