Method of manufacturing all-solid-state battery

Abstract

This disclosure provides a method for manufacturing an all-solid-state battery. The method includes a mixture forming step of mixing a positive electrode active material powder coated with a lubricating material with an electrolyte powder to form a mixture, an application step of applying the mixture to a positive electrode current collector, and a pressurizing step of pressurizing the mixture and the positive electrode current collector. This can reduce the porosity in the positive electrode composite layer formed in the pressurizing step, thereby improving the performance of the all-solid-state battery.

Description

Technical Field

[0001] This 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 capable of reducing pores between the positive electrode active material (e.g., positive electrode active material powder) and the electrolyte (e.g., electrolyte powder). Prior Technology

[0002] All-solid-state batteries are batteries that replace the traditional liquid electrolyte between the positive and negative electrodes with a solid electrolyte.

[0003] In conventional batteries containing liquid electrolytes, there is a risk of fire if the positive and negative electrodes come into contact. However, in all-solid-state batteries, where lithium ions move and the electrolyte system is in a solid state, the electrolyte and electrodes remain fixed. Therefore, all-solid-state batteries can operate normally without damage or explosion even in the event of disturbance.

[0004] For example, Korean Patent Application Publication No. 10-2016-0060171 (hereinafter referred to as the "Prior Art Document") discloses an all-solid-state battery that does not contain a binder, and a method for injecting a slurry of active material into the pores of a carbon structure contained in the positive electrode.

[0005] However, the invention disclosed in the previous technical documents did not take into account the pores formed in the positive electrode composite material (cathode composite material), wherein the positive electrode composite material is a composite material of positive electrode active material powder and electrolyte powder formed by pressurizing positive electrode active material powder and electrolyte powder.

[0006] Furthermore, the invention disclosed in the previous technical documents requires a process of injecting an active material slurry into a positive electrode in which pores have been formed, and a process of drying the injected active material, which reduces the manufacturing efficiency of all-solid-state batteries.

[0007] Furthermore, the invention disclosed in the prior art documents has the following problem: the density of the electrolyte mixed with the positive electrode may decrease, thereby reducing the performance of the all-solid-state battery.

[0008] Previous technical documents

[0009] patent

[0010] Korean Patent Application Publication No. 10-2016-0060171 Summary of the Invention

[0011] The present invention is proposed in response to the above-mentioned problems. The purpose of the present invention is to provide a method for manufacturing an all-solid-state battery, which can reduce the porosity in the positive electrode composite material formed by pressurizing positive electrode active material powder and electrolyte powder.

[0012] Another object of the present invention is to provide a method for manufacturing an all-solid-state battery, 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 cathode composite material.

[0013] Another object of the present invention is to provide a method for manufacturing an all-solid-state battery, which can improve the mass production capacity of all-solid-state batteries.

[0014] According to one embodiment of the present invention, the above and other objectives can be achieved by providing a method for manufacturing an all-solid-state battery, the method comprising: a mixture forming step, which mixes positive electrode active material powder coated with a lubricating material and electrolyte powder to form a mixture; an application step, which applies the mixture to a positive electrode current collector; and a pressurizing step, which pressurizes the mixture and the positive electrode current collector. In the embodiment of the present invention, the porosity in the positive electrode composite material containing the mixture of positive electrode active material powder and electrolyte powder can be reduced by using the lubricating material.

[0015] This method can further include a coating step, in which a lubricating material is applied to the positive electrode active material powder prior to the mixture formation step. This improves the flowability (or degree of freedom of movement) of the electrolyte powder in the positive electrode composite. Furthermore, large-scale production can be ensured simply by pressurizing the pre-coated lubricating positive electrode active material powder and the electrolyte powder.

[0016] The lubricating material may include a metal precursor and a sulfur precursor. That is, during 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. During the coating step, the metal precursor and the sulfur precursor provided in powder form may be mixed with the positive electrode active material powder.

[0017] The metal precursor can be a compound containing at least one of molybdenum (Mo) and tungsten (W). Furthermore, the sulfur precursor can be a compound containing sulfur (S).

[0018] The coating step can be performed 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 metal precursor and sulfur precursor are mixed with the positive electrode active material powder (e.g., frictional heat). Of course, the heat required for the chemical reaction can also be obtained through both reactor heating and frictional heat.

[0019] In the mixture forming step, at least one of an adhesive and a conductive agent may be further mixed in.

[0020] The lubricating material can be made of at least one of molybdenum sulfide, tungsten sulfide, boron nitride, indium, Teflon, and graphite. Therefore, porosity can be reduced without restricting the movement of ions and electrons in the all-solid-state battery.

[0021] In the pressurization step, a portion of the electrolyte powder can be mixed with the positive electrode active material powder, and the mixture can be pressurized to form a positive electrode composite layer. An electrolyte layer formed by pressurizing the electrolyte powder can then be formed on the positive electrode composite layer. Therefore, the porosity in the positive electrode composite layer can be reduced through the use of lubricating materials.

[0022] In the positive electrode composite layer, electrolyte powder can be attached to the surface of the positive electrode active material powder in a pulverized state. Therefore, the lubricating material can improve the flowability (or degree of freedom of movement) of the electrolyte powder attached to the surface of the positive electrode active material powder.

[0023] The negative electrode active material can be configured to face the positive electrode active material and be in a state where the electrolyte powder is inserted between them, and the negative electrode current collector can be disposed on the negative electrode active material.

[0024] During the pressurization step, the electrolyte powder can slide around the positive electrode active material due to the lubricating material, thereby reducing the porosity in the positive electrode composite material.

[0025] According to another aspect of the present invention, a method for manufacturing an all-solid-state battery is provided. This method includes: a mixture forming step, which mixes a lubricating material, a positive electrode active material powder, and an electrolyte powder to form a mixture; an application step, which applies the mixture to a positive electrode current collector; and a pressurizing step, which pressurizes the mixture and the positive electrode current collector. In another aspect of the present invention, the flowability (or degree of freedom of movement) of the electrolyte powder adhering to the surrounding positive electrode active material powder in a pulverized state can be improved, thereby reducing porosity in the positive electrode composite material. Therefore, the performance of the all-solid-state battery can be improved. Simple Explanation of the Diagram

[0026] The above and other objects, features, and other effects of the present invention will be more clearly understood through the following detailed description, taken in conjunction with the accompanying drawings, wherein: Figure 1 is a conceptual schematic diagram of an all-solid-state battery according to an embodiment of the present invention; Figure 2 is a schematic diagram of an embodiment of a method for pressurizing the positive electrode active material and the electrolyte; Part (a) of Figure 3 is a conceptual schematic diagram of the pores in the positive electrode composite material formed when positive electrode active material powder and electrolyte powder are pressurized, and part (b) of Figure 3 is a conceptual schematic diagram of the pores in the positive electrode composite material formed when positive electrode active material powder and electrolyte powder coated with lubricating material are pressurized; Figure 4 is a flowchart of a method for manufacturing an all-solid-state battery according to an embodiment of the present invention; and Figure 5 is a flowchart of a method for manufacturing an all-solid-state battery according to another embodiment of the present invention. Implementation

[0027] In the following, 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 embodiments of the invention and are provided to illustrate the invention in more detail, but are not intended to limit the scope of the invention.

[0028] Furthermore, identical or corresponding elements are identified by the same element symbol, regardless of the drawing number, and repeated descriptions will be omitted. Additionally, for ease of explanation, the dimensions and shapes of the elements shown may be exaggerated or reduced.

[0029] Furthermore, in the description of this invention, detailed descriptions of relevant prior art will be omitted when it is determined that such detailed descriptions would obscure the technical points of this invention.

[0030] Figure 1 is a conceptual schematic diagram of an all-solid-state battery according to an embodiment of the present invention.

[0031] Referring to Figure 1, an all-solid-state battery according to an embodiment of the present invention may include a positive current collector 100, a positive active material 200 disposed on the positive current collector 100, a negative active material 400 disposed on the positive active material 200, an electrolyte 300 disposed between the positive active material 200 and the negative active material 400, and a negative current collector 500 disposed on the negative active material 400.

[0032] The positive electrode current collector 100 and the negative electrode current collector 500 are used to collect electrons generated by the electrochemical reaction of the active material (positive electrode active material or negative electrode active material), or to provide electrons required for the electrochemical reaction.

[0033] The positive electrode active material 200 can be provided in the form of a solid powder and pressurized together with the electrolyte 300 (e.g., a solid electrolyte), as will be described below. For example, both 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 supplied on top of the positive electrode active material 200 powder, the positive electrode active material 200 powder and the electrolyte 300 powder can be mixed with each other, and the mixture of the positive electrode active material 200 powder and the electrolyte 300 powder can be pressurized.

[0034] The positive electrode active material 200 may be made of at least one of the following materials: lithium-rich layered oxide cathode (Li1-XNiXMnXCoXO2), 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 (LiNiXMn2-XO4), lithium manganese oxide (LiMn2O4), lithium nickel cobalt aluminum oxide (NCA, LiNiXCoXAlYO2), lithium nickel manganese oxide (NMC, LiNiXMnYCoXO2), and lithium cobalt oxide (LiCoO2), or two or more of these compounds.

[0035] Electrolyte 300 can be formed as a solid and can be provided in powder form. That is, solid electrolyte 300 powder can be supplied on positive electrode active material 200 powder, and the positive electrode active material 200 powder and electrolyte 300 powder can be pressurized. At least a portion of electrolyte 300 powder can be mixed into the interstitial spaces of positive electrode active material 200 powder by pressurization, and the remaining portion of electrolyte 300 powder can be stacked on positive electrode active material 200 powder.

[0036] Electrolyte 300 may be made of at least one of the following materials: lithium phosphide (Li3PS4), lithium thiophosphate (Li7P3S11), argyrodite-type Li6PS5X (X = Cl, Br or I), lithium germanium sulfide (Li10GeP2S12), lithium tin sulfide (Li10S2S12), lithium antimony sulfide (Li3SbS4), lithium boron sulfide (Li2B6S10), lithium oxyphosphide (LiPON), and lithium superion conductor (LISICON).

[0037] The negative electrode active material 400 can be disposed on the electrolyte 300, facing the positive electrode active material 200. For example, the negative electrode active material 400 can be provided in the form of a solid thin film.

[0038] The negative electrode active material 400 can be made of lithium, silicon, graphite, or silver / carbon nanotube (Ag / CNT) composite material.

[0039] 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.

[0040] Meanwhile, pressure can be applied while positive electrode active material 200 powder and electrolyte 300 powder are supplied to the positive electrode current collector 100, as shown in Figure 2.

[0041] Referring to Figure 2, with positive electrode active material 200 powder and electrolyte 300 powder supplied on the positive electrode current collector 100, a pair of rollers 700 can be used to pressurize the positive electrode active material 200 powder and electrolyte 300 powder on the positive electrode current collector 100. Although the layers of positive electrode active material 200 powder and electrolyte 300 powder are shown separately in the figures, a premixed mixture of positive electrode active material 200 powder and electrolyte 300 powder can be supplied on the positive electrode current collector 100 and pressurized using a pair of rollers 700.

[0042] Although not shown, the mixture of positive electrode active material 200 powder and electrolyte 300 powder may further include at least one of binder and conductive agent.

[0043] For example, the adhesive can 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, or nylon. One or a mixture of two or more of the above examples can be used as an adhesive.

[0044] For example, Ketjen black, carbon black, SuperC, SuperP, carbon nanotubes (CNTs), or vapor-grown carbon fibers (VGCF) can be used as conductive agents.

[0045] Adhesives and conductive agents are well known in the art, and therefore their detailed descriptions will be omitted.

[0046] Although Figure 2 shows an example of using a pair of rollers 700 to pressurize the positive active material 200 powder and electrolyte 300 powder on the positive current collector 100, other known pressurization methods, such as surface pressurization or vacuum pressurization, can also be used in addition to using rollers for pressurization.

[0047] As shown in Figure 1, when the positive electrode active material 200 powder and the electrolyte 300 powder are pressurized, a positive electrode composite layer containing a mixture of the positive electrode active material 200 powder and the electrolyte 300 powder can be formed. The positive electrode composite layer can be configured to have a structure in which the electrolyte 300 powder is attached to the outer circumferential surface of the positive electrode active material 200 powder in a pulverized state.

[0048] Multiple pores C can be formed in the positive electrode composite layer, which will be explained below. Pores C may act as internal resistance, which may be a factor that reduces the performance of all-solid-state batteries.

[0049] In an embodiment of the present invention, lubricating material 250 can be added before or during the pressurization of positive electrode active material 200 powder and electrolyte 300 powder to reduce pore size C.

[0050] For example, the lubricant 250 may be made of at least one of molybdenum sulfide, tungsten sulfide, boron nitride, indium, Teflon, and graphite, or of two or more of these compounds.

[0051] As shown in Figure 1, in this embodiment, before the positive electrode active material 200 powder and the electrolyte 300 powder are pressurized, the positive electrode active material 200 powder may be pre-coated with a solid lubricant 250.

[0052] Preferably, in another embodiment, although not shown, when the positive electrode active material 200 powder and the electrolyte 300 powder are pressurized, a solid lubricant 250 may be supplied in addition to the positive electrode active material 200 powder and the electrolyte 300 powder.

[0053] When pressurizing the positive electrode active material 200 powder and the electrolyte 300 powder, the fluidity (or freedom of movement) of the electrolyte 300 powder can be increased by the lubricating material 250. That is, even if the electrolyte 300 powder is attached to the outer circumferential surface of the positive electrode active material 200 powder in a pulverized state, the lubricating material 250 can still allow the electrolyte 300 powder to move to fill the pores C.

[0054] Figure 3 is a conceptual diagram showing the pores C formed when the positive electrode active material 200 powder and the electrolyte 300 powder are pressurized without and with lubricating material 250, to compare the differences between the two.

[0055] Part (a) of Figure 3 is a conceptual schematic diagram of the pores in the positive electrode composite material formed when positive electrode active material powder and electrolyte powder are pressurized, and part (b) of Figure 3 is a conceptual schematic diagram of the pores in the positive electrode composite material formed when positive electrode active material powder and electrolyte powder coated with lubricating material are pressurized.

[0056] Referring to part (a) of Figure 3, it can be seen that when the positive electrode active material 200 powder and the electrolyte 300 powder are pressurized without the presence of lubricating material 250, a relatively large number (relatively large volume) of pores C are formed in the positive electrode composite material after pressurization (refer to Figure 1).

[0057] Conversely, referring to part (b) of Figure 3, it can be seen that when lubricating material 250 is provided (e.g., when the positive electrode active material 200 powder is coated with lubricating material 250), the number of pores C (or the volume of pores C) is relatively reduced.

[0058] Therefore, if a lubricating material 250 is provided when the positive electrode active material 200 powder and the electrolyte 300 powder are pressurized (for example, if the positive electrode active material 200 powder is coated with lubricating material 250), the porosity C in the positive electrode composite material can be reduced, thereby improving the performance of the all-solid-state battery.

[0059] In the following description, a method for manufacturing an all-solid-state battery according to an embodiment of the present invention will be described with reference to other accompanying drawings. It will be apparent in the description of the method for manufacturing an all-solid-state battery that the above-described configuration of the all-solid-state battery can be equally applied to the method for manufacturing an all-solid-state battery.

[0060] Figure 4 is a flowchart of a method for manufacturing an all-solid-state battery according to an embodiment of the present invention.

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

[0062] In the mixture forming step S20, the positive electrode active material 200 powder coated with lubricating material 250 and the electrolyte 300 powder can be mixed together to form a mixture. That is, this mixture is a mixture of positive electrode active material 200 powder coated with lubricating material 250 and electrolyte 300 powder, and this mixture may contain at least one of conventional binders and conductive agents.

[0063] In the mixture formation step S20, the electrolyte 300 powder can be mixed with the positive electrode active material 200 powder, and the electrolyte 300 powder can be further 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.

[0064] In step S30, the mixture can be applied to the positive current collector 100, which is provided in the form of a thin film. That is, the mixture can be placed on the positive current collector 100 for pressurization, as will be described below.

[0065] In the pressurization step S40, the mixture and the positive electrode current collector 100 can be pressurized. That is, in the pressurization step S40, the positive electrode active material 200 powder and the electrolyte 300 powder can be pressurized on the positive electrode current collector 100.

[0066] A portion of electrolyte powder 300 can be introduced into the positive electrode active material 200 powder to form a positive electrode composite layer, and an electrolyte layer formed by pressurizing the remaining portion of electrolyte powder 300 powder can be formed on the positive electrode composite layer.

[0067] At this time, in the positive electrode composite layer, the electrolyte 300 powder can be attached to the outer circumferential surface of the positive electrode active material 200 in a pulverized state, and the fluidity (or degree of freedom of movement) of the electrolyte 300 powder can be improved by the lubricating material 250.

[0068] In other words, during the pressurization step S40, the electrolyte 300 powder can slide around the positive electrode active material 200 powder due to the lubricating material 250, thereby reducing the porosity C in the positive electrode composite material.

[0069] Therefore, the pore size C in the positive electrode composite material formed by pressurizing the positive electrode active material 200 powder and the electrolyte 300 powder can be reduced, thereby improving the performance of the all-solid-state battery.

[0070] In embodiments of the present invention, a coating step S10 may be further included prior to the mixture formation step S20.

[0071] In the coating step S10, the positive electrode active material 200 powder may be coated with a solid lubricating material 250. When the electrolyte 300 powder is attached to the outer circumferential surface of the positive electrode active material 200 powder in a pulverized state, the lubricating material 250 allows the electrolyte 300 powder to move to fill the pores C.

[0072] The lubricating material may include a metal precursor and a sulfur precursor. That is, in the coating step S10, the metal precursor and the sulfur precursor can be coated onto the surface of the positive electrode active material powder through a sequential or simultaneous chemical reaction. For example, the metal precursor powder and the sulfur precursor powder can be mixed in the positive electrode active material powder and undergo a chemical reaction.

[0073] In the coating step S10, the metal precursor in powder form and the sulfur precursor in powder form can be mixed with the positive electrode active material powder. For example, the chemical reaction between the metal precursor and the sulfur precursor can occur in accordance with the following chemical formula 1.

[0074] Chemical formula 1: MoClx + 2H2S → MoS2 + 2HCl

[0075] The metal precursor can be a compound containing at least one of molybdenum (Mo) and tungsten (W). Furthermore, the sulfur precursor can be a compound containing sulfur (S).

[0076] The coating step S10 can be carried out in a reactor (not shown). The heat required for the chemical reaction in the coating step S10 can be obtained by heating the reactor. Alternatively, the heat required for the chemical reaction can be obtained by the heat generated when the metal precursor and sulfur precursor are mixed with the positive electrode active material powder (e.g., frictional heat). Of course, the heat required for the chemical reaction can also be obtained by both heating the reactor and frictional heat.

[0077] The negative electrode active material 400 can be positioned facing the positive electrode active material 200, with the electrolyte 300 powder interposed therebetween. The negative electrode active material 400 can be provided in the form of a thin film. The negative electrode current collector 500 can be disposed on the negative electrode active material 400.

[0078] Therefore, in the embodiments of the present invention, the pore size C in the positive electrode composite material formed by pressurizing the positive electrode active material 200 powder and the electrolyte 300 powder can be reduced, thereby improving the performance of the all-solid-state battery. Furthermore, the mass production rate of all-solid-state batteries can be improved.

[0079] Meanwhile, in another embodiment of the present invention, the positive electrode active material 200 powder may not be pre-coated with the lubricating material 250. For example, the lubricating material 250 may also be mixed when the positive electrode active material 200 powder and the electrolyte 300 powder are mixed together before the pressurization step. In the following, a method for manufacturing an all-solid-state battery according to another embodiment of the present invention will be described with reference to other accompanying drawings.

[0080] Figure 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 Figure 4 in that the positive electrode active material 200 powder is not pre-coated with lubricating material 250, and lubricating material 250 is mixed in with the positive electrode active material 200 powder and the electrolyte 300 powder. The following description will focus on the differences from the embodiment in Figure 4.

[0081] Referring to Figure 5, a method for manufacturing an all-solid-state battery according to another embodiment of the present invention may include a mixture formation step S100, an application step S200, and a pressurization step S300.

[0082] 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) can be mixed together, and the electrolyte 300 powder can be further disposed on the positive electrode active material 200 powder. That is, in the mixture formation step S100, a portion of the electrolyte 300 powder can be mixed with the positive electrode active material 200 powder and the lubricant 250, and the remaining portion of the electrolyte 300 powder can be disposed on the positive electrode active material 200.

[0083] In step S200, the mixture can be applied to the positive current collector 100, which is provided in the form of a thin film. That is, the mixture can be placed on the positive current collector 100 to apply pressure, as will be described below.

[0084] In the pressurization step S300, the mixture and the positive current collector 100 can be pressurized. That is, in the pressurization step S300, the positive active material 200 powder, the electrolyte 300, and the lubricating material 250 (or lubricating material powder) can be pressurized on the positive current collector 100.

[0085] A portion of electrolyte 300 powder can be introduced into the positive electrode active material 200 powder together with the lubricating material 250 to form a positive electrode composite layer, and an electrolyte layer formed by pressurizing the remaining portion of the electrolyte 300 powder can be formed on the positive electrode composite layer.

[0086] At this time, in the positive electrode composite layer, the electrolyte 300 powder can be attached to the outer peripheral surface of the positive electrode active material 200 in a pulverized state, and the flow rate (or degree of freedom of movement) of the electrolyte 300 powder can be improved by the lubricating material 250.

[0087] In other words, during the pressurization step S300, the electrolyte 300 powder can slide around the positive electrode active material 200 powder due to the lubricating material 250, thereby reducing the porosity C in the positive electrode composite material.

[0088] Therefore, in another embodiment of the present invention, the porosity C in the positive electrode composite material formed by pressurizing the positive electrode active material 200 powder and the electrolyte 300 powder can be reduced, thereby improving the performance of the all-solid-state battery. Furthermore, the mass production rate of all-solid-state batteries can be improved.

[0089] According to the present invention, a method for manufacturing an all-solid-state battery can be provided, which can reduce the porosity in the positive electrode composite material formed by pressurizing positive electrode active material powder and electrolyte powder.

[0090] Furthermore, 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.

[0091] Furthermore, 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.

[0092] For illustrative purposes, the preferred embodiments of the present invention described above have been disclosed. Those skilled in the art will understand that various modifications, alterations, and additions can be made within the spirit and scope of the present invention, and such modifications, alterations, and additions all fall within the scope of the appended claims.

[0093] 100: Positive current collector 200: Positive electrode active material 250: Lubricating materials 300: Electrolyte 400: Negative electrode active material 500: Negative current collector 700: Roller C: Pores S10, S20, S30, S40, S100, S200, S300: Steps

Claims

1. A method for manufacturing an all-solid-state battery, the method comprising: a coating step of coating a positive electrode active material powder with a lubricating material; a mixture forming step of mixing the positive electrode active material powder coated with the lubricating material and an electrolyte powder to form a mixture; an application step of applying the mixture to a positive electrode current collector; and a pressurizing step of pressurizing the mixture and the positive electrode current collector; wherein the lubricating material comprises a metal precursor and a sulfur precursor, and in the coating step, the metal precursor and the sulfur precursor chemically react sequentially or simultaneously on the surface of the positive electrode active material powder to coat the surface of the positive electrode active material powder.

2. The manufacturing method as claimed in claim 1, wherein in the mixture forming step, at least one of an adhesive and a conductive agent is further mixed.

3. The manufacturing method as claimed in claim 1, wherein the lubricating material is made of at least one selected from molybdenum sulfide, tungsten sulfide, boron nitride, indium, Teflon, and graphite.

4. The manufacturing method as claimed in claim 1, wherein in the pressurization step, a portion of the electrolyte powder is mixed with the positive electrode active material powder, and the mixture is pressurized to form a positive electrode composite layer, and an electrolyte layer formed by pressurizing the electrolyte powder is formed on the positive electrode composite layer.

5. The manufacturing method as described in claim 4, wherein in the positive electrode composite layer, the electrolyte powder is attached to the surface of the positive electrode active material powder in a pulverized state.

6. The manufacturing method as claimed in claim 1, wherein a negative electrode active material is configured to face the positive electrode active material and is in a state where the electrolyte powder is inserted therebetween, and a negative electrode current collector is disposed on the negative electrode active material.

7. The manufacturing method as claimed in claim 1, wherein in the pressurization step, the electrolyte powder slides around the positive electrode active material due to the lubricating material, thereby reducing the porosity in a positive electrode composite material.

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