All-solid-state battery and method for manufacturing the same

Abstract

To improve cycle characteristics.SOLUTION: An all-solid battery includes an electrode layer. The electrode layer includes an active material, a solid electrolyte, and a polysiloxane compound. For 100 parts by mass of the electrode layer, an amount of the polysiloxane compound is more than 0 parts by mass and 10 parts by mass or less. The polysiloxane compound is attached to at least the solid electrolyte.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to all-solid-state batteries and methods for manufacturing the same.

Background Art

[0002] JP 2020-181640 A (Patent Document 1) discloses a coated cathode active material for an all-solid-state battery.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There is a demand for reducing the resistance of all-solid-state batteries (hereinafter may be abbreviated as "batteries"). One of the resistance components in the battery is a low ion-conductive layer formed on the surface of the active material. The low ion-conductive layer is considered to be formed by oxidation of the surface of the active material. In order to inhibit the formation of the low ion-conductive layer, it has been proposed to coat the surface of the active material with a polysiloxane compound. By this technique, reduction of the initial resistance is expected. However, there is room for improvement in cycle characteristics. Therefore, the present disclosure aims to improve cycle characteristics.

Means for Solving the Problems

[0005] 1. In one aspect of the present disclosure, an all-solid-state battery includes an electrode layer. The electrode layer includes an active material, a solid electrolyte, and a polysiloxane compound. With respect to 100 parts by mass of the electrode layer, the polysiloxane compound is more than 0 part by mass and 10 parts by mass or less. The polysiloxane compound is adhered to at least the solid electrolyte.

[0006] Hereinafter, "Solid Electrolyte" may be abbreviated as "SE". For example, a sulfide solid electrolyte may be abbreviated as "sulfide SE".

[0007] According to the new findings of the present disclosure, the surface of the SE may also be oxidized as the charge-discharge cycle is repeated. The oxidation of the SE may accelerate performance degradation.

[0008] In the electrode layer described in "1" above, a polysiloxane compound is attached to the SE. The polysiloxane compound can improve the oxidation resistance of the SE. By improving the oxidation resistance of the SE, improvement of cycle characteristics is expected. However, the addition amount of the polysiloxane compound is 10 parts by mass or less with respect to 100 parts by mass of the electrode layer. If the polysiloxane compound exceeds 10 parts by mass, the surface of the coating film may be covered with the polysiloxane compound during the coating of the electrode slurry, which may make it difficult to form the electrode layer.

[0009] 2. In the all-solid-state battery described in "1" above, the polysiloxane compound may contain, for example, a structure represented by the following formula (1).

[0010]

Chemical formula

[0011] In the above formula (1), R 1 and R 2 are each independently a hydrogen atom, a hydroxy group, an alkyl group, a carbonyl group, an alkoxy group, a carboxylic acid ester group, or an acryloxy group. n is a real number of 3 or more.

[0012] 3. In the all-solid-state battery described in "1" or "2" above, the polysiloxane compound may be 4 to 8 parts by mass with respect to 100 parts by mass of the electrode layer.

[0013] At this addition amount, there is a tendency for a large improvement effect on cycle characteristics. In the present disclosure, a numerical range such as "m to n%" includes upper and lower limit values. That is, "m to n%" indicates a numerical range of "m% or more and n% or less". Also, "m% or more and n% or less" includes "more than m% and less than n%".

[0014] 4. In one aspect of the present disclosure, the all-solid-state battery includes a positive electrode layer. The positive electrode layer includes a positive electrode active material, a sulfide solid electrolyte, and a polysiloxane compound. With respect to 100 parts by mass of the positive electrode layer, the polysiloxane compound is 4 to 8 parts by mass. The polysiloxane compound adheres to both the positive electrode active material and the sulfide solid electrolyte. The polysiloxane compound includes a structure represented by the above formula (1).

[0015] The electrode layer may contain a sulfide SE. The sulfide SE can exhibit high ionic conductivity. The electrode layer may be a positive electrode layer. Since the positive electrode layer has a high potential, oxidation of the sulfide SE tends to proceed. In such a configuration, the addition of the polysiloxane compound is particularly effective. By the polysiloxane compound adhering not only to the positive electrode active material but also to the sulfide SE, improvement of cycle characteristics is expected.

[0016] 5. In one aspect of the present disclosure, a method for manufacturing an all-solid-state battery includes the following (a) to (c). (a) A positive electrode slurry is formed by mixing a positive electrode active material, a sulfide solid electrolyte, a polysiloxane compound, and a dispersion medium. (b) A positive electrode layer is formed by coating the positive electrode slurry. (c) An all-solid-state battery including the positive electrode layer is manufactured. With respect to 100 parts by mass of the electrode layer, the polysiloxane compound is 4 to 8 parts by mass. The polysiloxane compound includes a structure represented by the above formula (1).

[0017] Conventionally, prior to the formation of the positive electrode slurry, the positive electrode active material has been coated with a polysiloxane compound. In such a conventional method, it is considered that the polysiloxane compound does not adhere to the sulfide SE. In the present disclosure, a polysiloxane compound is added to the positive electrode slurry. According to such a method, the polysiloxane compound can also adhere to the sulfide SE.

[0018] Hereinafter, embodiments of the present disclosure (hereinafter may be abbreviated as "the present embodiments"), and examples of the present disclosure (hereinafter may be abbreviated as "the present examples") will be described. However, the present embodiments and the present examples do not limit the technical scope of the present disclosure. The present embodiments and the present examples are illustrative in all respects. The present embodiments and the present examples are non-limiting. The technical scope of the present disclosure includes all modifications within the meaning and scope equivalent to the description of the claims. For example, it has been initially planned that any configurations are extracted from the present embodiments and the present examples and combined arbitrarily.

[0019] The descriptions of "comprising", "including", "having", and variations thereof (such as "composed of", etc.) are in an open-ended form. The open-ended form may further include additional elements in addition to the essential elements, or may not include them. The description of "consisting of" is in a closed form. However, even in the closed form, additional elements that are normally accompanying impurities or are irrelevant to the present disclosure technology are not excluded. The description of "substantially consisting of" is in a semi-closed form. In the semi-closed form, the addition of elements that do not substantially affect the basic and novel characteristics of the present disclosure technology is allowed.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0021] <All-solid-state battery> FIG. 1 is a conceptual diagram of an all-solid-state battery according to the present embodiment. In FIG. 1, a cross section parallel to the thickness direction of the battery 100 is conceptually shown. The battery 100 includes a power generation element 50. The battery 100 may include, for example, an exterior body (not shown). The exterior body may house the power generation element 50. The exterior body may be, for example, a pouch made of a metal foil laminate film or the like, or a metal case or the like. The battery 100 may include a single power generation element 50 alone, or may include a plurality of power generation elements 50. The plurality of power generation elements 50 may form, for example, a series circuit or a parallel circuit.

[0022] The power generation element 50 includes a first electrode layer 10, a separator layer 30, and a second electrode layer 20. The power generation element 50 may include a plurality of the first electrode layer 10, the separator layer 30, and the second electrode layer 20, respectively. As an example, the power generation element 50 in FIG. 1 includes two layers each of the first electrode layer 10, the separator layer 30, and the second electrode layer 20. The separator layer 30 is interposed between the first electrode layer 10 and the second electrode layer 20. The separator layer 30 separates the first electrode layer 10 from the second electrode layer 20. The separator layer 30 may include, for example, sulfide SE or the like. The separator layer 30 may have a thickness of, for example, 1 to 100 μm.

[0023] The second electrode layer 20 has a polarity different from that of the first electrode layer 10. For example, when the first electrode layer 10 is a positive electrode layer, the second electrode layer 20 is a negative electrode layer. The power generation element 50 may further include a first current collector 11 and a second current collector 21. The first current collector 11 is in contact with the first electrode layer 10. The second current collector 21 is in contact with the second electrode layer 20. For example, when the first electrode layer 10 is a positive electrode layer, the first current collector 11 is a positive electrode current collector. For example, when the second electrode layer 20 is a negative electrode layer, the second current collector 21 is a negative electrode current collector. The first current collector 11 and the second current collector 21 may each independently have a thickness of, for example, 5 to 50 μm. The first current collector 11 and the second current collector 21 may each independently include, for example, Al foil, Al alloy foil, Cu foil, Ni foil, stainless steel foil, etc.

[0024] 《Electrode Layer》 The first electrode layer 10 and the second electrode layer 20 are collectively referred to as the "electrode layer". The electrode layer may have a thickness of, for example, 10 to 1000 μm. The electrode layer includes an active material, an SE, and a polysiloxane compound. The electrode layer may further include, for example, a conductive material, a binder, etc.

[0025] 《Polysiloxane Compound》 The polysiloxane compound is at least attached to the SE. The polysiloxane compound attached to the SE can improve the oxidation resistance of the SE. By improving the oxidation resistance of the SE, an improvement in cycle characteristics is expected. The polysiloxane compound may be attached to a part of the surface of the SE or may be attached to the entire surface of the SE. The polysiloxane compound may cover the surface of the SE. The polysiloxane compound may be bonded to the surface of the SE. As long as the polysiloxane compound is attached to the SE, the polysiloxane compound may also be attached to, for example, an active material, a conductive material, a binder, etc. The polysiloxane compound can also improve the oxidation resistance of the active material, the conductive material, etc.

[0026] The polysiloxane compound contains a structure in which two or more siloxane bonds (-Si-O-) are linked. The polysiloxane compound may be, for example, linear, branched, or cyclic. The polysiloxane compound may contain, for example, a structure represented by the following formula (1).

[0027]

Chemical formula

[0028] In the above formula (1), R 1 and R 2 are each independently a hydrogen atom, a hydroxy group, an alkyl group, a carbonyl group, an alkoxy group, a carboxylic acid ester group, or an acryloxy group. These substituents may be further substituted. The polysiloxane compound may, for example, not contain an unsaturated bond such as "C=C". R 1 and R 2 may be bonded to each other to form a ring.

[0029] In the above formula (1), n is a real number of 3 or more. n may be, for example, 5 or more, 10 or more, or 100 or more. n may be, for example, 1000 or less, 500 or less, 100 or less, 10 or less, or 5 or less.

[0030] The polysiloxane compound may contain, for example, 2,4,6,8-tetramethylcyclotetrasiloxane (TMCTS), etc. TMCTS is a cyclic compound. In the above formula (1), TMCTS contains a structure in which R 1 is a hydrogen atom, R 2 is a methyl group, and n is 4.

[0031] The addition amount of the polysiloxane compound is more than 0 parts by mass and 10 parts by mass or less with respect to 100 parts by mass of the electrode layer. When the polysiloxane compound exceeds 10 parts by mass, it may be difficult to form the electrode layer. The addition amount of the polysiloxane compound may be, for example, 0.01 parts by mass or more, 0.1 parts by mass or more, 1 part by mass or more, 2 parts by mass or more, 4 parts by mass or more, or 6 parts by mass or more with respect to 100 parts by mass of the electrode layer. The addition amount of the polysiloxane compound may be, for example, 8 parts by mass or less, or 6 parts by mass or less with respect to 100 parts by mass of the electrode layer. The addition amount of the polysiloxane compound may be, for example, 4 to 8 parts by mass with respect to 100 parts by mass of the electrode layer. At this addition amount, the effect of improving the cycle characteristics tends to be large.

[0032] 《Active Material》 The active material causes an electrode reaction. The active material may be, for example, particulate. The active material may have a D50 of, for example, 1 to 30 μm, or 5 to 15 μm. "D50" indicates the particle diameter at which the cumulative frequency from the smaller particle diameter reaches 50% in the volume-based particle size distribution. D50 can be measured by a laser diffraction particle size distribution measuring device. The compounding amount of the active material may be, for example, 60 to 95 parts by mass with respect to 100 parts by mass of the electrode layer.

[0033] The active material may be, for example, a positive electrode active material. The positive electrode active material may contain, for example, at least one selected from the group consisting of LiCoO2, LiNiO2, LiMnO2, LiMn2O4, Li(NiCoMn)O2, Li(NiCoAl)O2, Li(NiCoMnAl)O2, and LiFePO4. For example, in "Li(NiCoMn)O2", "(NiCoMn)" indicates that the total of the composition ratios in the parentheses is 1.

[0034] The active material may be a negative electrode active material. The negative electrode active material is, for example, natural graphite, artificial graphite, soft carbon, hard carbon, Si, SiO x (0 < x < 2), Si-based alloy, Sn, SnO x (0 < x < 2), Li, Li-based alloy, and Li4Ti5O 12It may contain at least one selected from the group consisting of.

[0035] The active material (particles) may be coated with a film. The film may have a thickness of, for example, 5 to 500 nm. The film may contain, for example, an oxide SE, a polysiloxane compound, etc. The oxide SE may contain, for example, LiNbO3, Li3PO4, etc.

[0036] 《Solid Electrolyte》 SE can form an ion conduction path in the electrode layer. SE may be in particle form. SE may have a D50 of, for example, 0.01 to 1 μm, 0.01 to 0.95 μm, or 0.1 to 0.9 μm. The blending amount of SE may be, for example, 1 to 30 parts by mass with respect to 100 parts by mass of the electrode layer.

[0037] The electrode layer may contain at least one selected from the group consisting of a sulfide SE, an oxide SE, and a fluoride SE. The sulfide SE can exhibit high ion conductivity. The sulfide SE may contain, for example, Li, P, and S. The sulfide SE may further contain, for example, O, Ge, Si, etc. The sulfide SE may further contain, for example, a halogen, etc. The sulfide SE may further contain, for example, I, Br, etc. The sulfide SE may be, for example, of the glass-ceramics type or the argyrodite type. The sulfide SE may be, for example, LiI-LiBr-Li3PS4, Li2S-SiS2, LiI-Li2S-SiS2, LiI-Li2S-P2S5, LiI-Li2O-Li2S-P2S5, LiI-Li2S-P2O5, LiI-Li3PO4-P2S5, Li2S-GeS2-P2S5, Li2S-P2S5, Li4P2S6, Li7P3S 11 and may contain at least one selected from the group consisting of Li3PS4.

[0038] For example, "LiI-LiBr-Li3PS4" represents a sulfide SE formed by mixing LiI, LiBr, and Li3PS4 in an arbitrary molar ratio (amount-of-substance ratio). The sulfide SE can be synthesized by any method. The sulfide SE may be synthesized, for example, by a gas-phase method, a solid-phase method, or a liquid-phase method. "Li2S-P2S5" contains Li3PS4. Li3PS4 can be formed, for example, by mixing Li2S and P2S5 at "Li2S / P2S5 = 75 / 25 (molar ratio)".

[0039] 《Other Components》 The electrode layer may contain, for example, a conductive material. The conductive material can form an electron conduction path in the electrode layer. The compounding amount of the conductive material may be, for example, 0.1 to 10 parts by mass with respect to 100 parts by mass of the electrode layer. The conductive material may contain at least one selected from the group consisting of acetylene black (AB), vapor-grown carbon fiber (VGCF), carbon nanotube (CNT), and graphene flake (GF).

[0040] The electrode layer may contain, for example, a binder. The binder can bind solid materials together. The compounding amount of the binder may be, for example, 0.1 to 10 parts by mass with respect to 100 parts by mass of the electrode layer. The binder may contain at least one selected from the group consisting of styrene-butadiene rubber (SBR), polyvinylidene fluoride (PVDF), and vinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP).

[0041] The electrode layer may contain, for example, 0.1 to 10 parts by mass of a polysiloxane compound, 0 to 10 parts by mass of a conductive material, 0.1 to 10 parts by mass of a binder, 1 to 30 parts by mass of SE, and the balance of the active material.

Examples

[0042] <No.1> 《Synthesis of Sulfide SE》 The raw material powder was prepared by weighing Li2S and P2S5. The mixing ratio of Li2S and P2S5 in the raw material powder was "Li2S / P2S5 = 75 / 25 (molar ratio)". The raw material powder and tetrahydrofuran (THF) were put into a glass container. The mixing ratio of the raw material and THF was "raw material powder / THF = 1 / 20 (mass ratio)". At 25°C, the raw material powder and THF were stirred for 72 hours. After stirring, the precipitate (powder) was recovered. The precipitate is a precursor of the sulfide SE. The precursor was dried at 25°C under an argon atmosphere to form a dried product. The dried product was calcined at 100°C for 1 hour under atmospheric pressure (open system) to form a first calcined product. The first calcined product was vacuum-sealed in a quartz tube. The quartz tube was calcined at 140°C for 12 hours in a muffle furnace to form a second calcined product. The particle size was adjusted by pulverizing the second calcined product. After pulverization, the second calcined product was calcined at 200°C for 1 hour or more to obtain the sulfide SE. Hereinafter, the sulfide SE is also referred to as "LPS".

[0043] Figure 2 is a schematic flowchart of the manufacturing method of the all-solid-state battery in this embodiment. A test battery was manufactured according to the flowchart of Figure 2.

[0044] 《(a) Formation of Electrode Slurry》 As a kneading device, "Filmix (registered trademark)" manufactured by Hosokawa Micron Corporation was prepared. 80 parts by mass of the positive electrode active material (LiNi 1 / 3 Co 1 / 3 Mn 1 / 39.51 parts by mass of sulfide SE (LPS), 2 parts by mass of conductive material (VGCF), and O2 were introduced. Then, a binder dispersion (SBR dispersion, concentration 5%) and 32.21 parts by mass of dispersion medium (tetralin) were introduced into the mixing vessel. The solid content fraction was 69% (mass fraction). Furthermore, a polysiloxane compound (TMCTS) was added. The addition amount was 2 parts by mass with respect to 100 parts by mass of the total solid content. By kneading the mixture, a positive electrode slurry was formed. That is, a positive electrode slurry was formed by mixing a positive electrode active material, sulfide SE, a polysiloxane compound, and a dispersion medium. During kneading, the peripheral speed of the Fillmix was adjusted within the range of 5 to 30 m / s.

[0045] 《(b) Formation of Electrode Layer》 The positive electrode slurry was applied to one side of a positive electrode current collector (Al foil) by a blade-type applicator to form a coating film. The positive electrode layer was formed by drying the coating film at 100°C for 30 minutes.

[0046] 《(c) Fabrication of All-Solid-State Battery》 (Formation of Negative Electrode Layer) In the Fillmix, 18.6 parts by mass of a negative electrode active material (Si), 8.69 parts by mass of sulfide SE (LPS), 2.4 parts by mass of a conductive material (VGCF), a binder dispersion (SBR dispersion, concentration 5%), and a dispersion medium (diisobutyl ketone) were mixed to form a negative electrode slurry. The solid content fraction of the negative electrode slurry was 43% (mass fraction). During kneading, the peripheral speed of the Fillmix was adjusted within the range of 5 to 30 m / s. The negative electrode slurry was applied to both sides of a negative electrode current collector (Ni foil) by a blade-type applicator to form a coating film. The negative electrode layer was formed by drying the coating film at 100°C for 30 minutes.

[0047] (Formation of Separator Layer) A separator slurry was formed by mixing 50 parts by mass of sulfide SE (LPS), a binder dispersion (SBR dispersion, concentration 5%), and a dispersion medium (diisobutyl ketone). The solid content ratio of the separator slurry was 49% (mass fraction). A separator layer was formed by coating the separator slurry on the surface of the substrate.

[0048] (Assembly) By pressing at 20 kN, a separator layer and a positive electrode layer were sequentially pressure-bonded to the surface of the negative electrode layer, thereby forming a power generation element. The power generation element was densified by roll pressing. The roll line pressure was 4 ton / cm and the roll gap was 100 μm. A positive electrode current collector (Al foil) was adhered to the positive electrode layer. As an exterior body, a pouch made of an Al laminate film was prepared. The power generation element was enclosed in the exterior body. A restraint member was attached to the outside of the exterior body so that a pressure of 5 MPa was applied to the power generation element. Thus, a test battery (all-solid-state battery including a positive electrode layer) was manufactured.

[0049] (Initial charge and discharge) CCCV charge and discharge (charge upper limit voltage 4.55 V, discharge lower limit voltage 2.5 V) was carried out. The designed capacity of the cell was 0.3 Ah. The time rate during CC charge or CC discharge was 0.1C. At a time rate of 1C, the designed capacity was discharged in 1 hour.

[0050] <No.2~5> A test battery was manufactured in the same manner as No.1 except that the addition amount of the polysiloxane compound was changed (see Table 1 below). The addition amounts in Table 1 below are parts by mass of the polysiloxane compound with respect to 100 parts by mass of the positive electrode layer.

[0051] <No.6, 7> With the addition amounts of the polysiloxane compounds shown in Table 1 below, attempts were made to form the positive electrode layer. However, during the coating of the positive electrode slurry, since the surface of the coating film was covered with the polysiloxane compound (since an oil film was formed on the surface of the coating film), it was difficult to form the positive electrode layer. Therefore, in Nos. 6 and 7, the production of the test cells was aborted.

[0052] <No.8> The test cells were manufactured in the same manner as in No. 1, except that the polysiloxane compound was not added to the positive electrode slurry.

[0053] <No.9> In No. 9, a coated positive electrode active material was formed by subjecting the positive electrode active material to a coating treatment with the polysiloxane compound. The coating amount (the addition amount of the polysiloxane compound) was 2 parts by mass with respect to 100 parts by mass of the positive electrode layer, the same as in No. 1. The test cells were manufactured in the same manner as in No. 8, except that the coated positive electrode active material was used.

[0054] The procedure for the coating treatment was as follows. An ethanol solution was formed by dissolving ethoxylithium in dehydrated ethanol. While the ethanol solution was being stirred, pentaethoxynb was added to the ethanol solution. The input amount of pentaethoxynb was adjusted so that "Li / Nb = 1 / 1 (molar ratio)". A precursor solution was formed by stirring until the solution became uniform. The precursor solution contained a precursor of the oxide layer. The precursor solution contained Li ions and Nb ions.

[0055] A rolling fluid coating apparatus (model "MP-01") manufactured by Paulek Co., Ltd. was prepared. In this apparatus, 476 parts by mass of the precursor solution was sprayed onto 1000 parts by mass of the positive electrode active material (LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2) and dried, whereby the coating treatment was carried out. The operating conditions of the apparatus were as follows.

[0056] Supply gas: nitrogen, supply gas temperature: 100 °C, supply gas flow rate: 0.3 m3 / h, Rotor rotation speed: 300 rpm, Spray speed: 1.5 g / min.

[0057] The material after the coating treatment was exposed to a nitrogen gas atmosphere (dew point temperature 18 °C, impurity concentration 59 ppm or less) for 4 hours, which promoted the hydrolysis of the precursor. Subsequently, heat treatment was carried out at 350 °C for 5 hours in the atmosphere, and an oxide layer was formed on the surface of the positive electrode active material. The oxide layer is considered to contain LiNbO3.

[0058] A TMCTS solution was prepared. In a sealed container, the TMCTS solution and the positive electrode active material were arranged separately so as not to contact each other. The sealed container was heated to 100 °C for 24 hours. As a result, a polysiloxane compound (TMCTS) adhered to the surface of the oxide layer. Thus, a coated positive electrode active material was formed. The coated positive electrode active material includes a coating film. The coating film is considered to include an oxide layer and a polysiloxane layer.

[0059] <Evaluation> In a test battery, charge-discharge cycles were carried out 1000 times. The resistance increase amount was obtained by subtracting the resistance after 1 cycle from the resistance after 1000 cycles. The smaller the resistance increase amount, the better the cycle characteristics.

[0060]

Table 1

[0061] <Results> When a polysiloxane compound is added to the electrode slurry, there is a tendency for the resistance increase amount to decrease (see No.1, 8).

[0062] Compared with the sample in which the positive electrode active material was coated with a polysiloxane compound, the sample in which a polysiloxane compound was added to the electrode slurry tended to have a larger reduction in the resistance increase amount (see No.1, 8, 9).

[0063] When the addition amount of the polysiloxane compound is 4 to 8 parts by mass, a tendency for a large reduction in the amount of resistance increase is observed (see Nos. 1 to 5).

[0064] When the addition amount of the polysiloxane compound exceeds 10 parts by mass, the formation of the electrode layer tends to become difficult (see Nos. 5 to 7).

Explanation of symbols

[0065] 10 First electrode layer, 11 First current collector, 20 Second electrode layer, 21 Second current collector, 30 Separator layer, 50 Power generation element, 100 All-solid-state battery.

Claims

1. comprising a positive electrode layer, wherein the positive electrode layer includes a positive electrode active material, a sulfide solid electrolyte, and a polysiloxane compound, with respect to 100 parts by mass of the positive electrode layer, the polysiloxane compound is 4 to 8 parts by mass, the polysiloxane compound is adhered to both the positive electrode active material and the sulfide solid electrolyte, the polysiloxane compound is a cyclic compound, the cyclic compound has a structure represented by formula (1): 【Chemical Formula 1】 formed by the cyclic linkage of the structure represented by, in the formula (1), R 1 and R 2 are each independently a hydrogen atom, a hydroxy group, an alkyl group, a carbonyl group, an alkoxy group, a carboxylic acid ester group, or an acryloxy group, n is a real number of 3 or more and 5 or less, all-solid-state battery.

2. (a) forming a positive electrode slurry by mixing a positive electrode active material, a sulfide solid electrolyte, a polysiloxane compound, and a dispersion medium, (b) forming a positive electrode layer by coating the positive electrode slurry, and (c) manufacturing an all-solid-state battery including the positive electrode layer, comprising, with respect to 100 parts by mass of the positive electrode layer, the polysiloxane compound is 4 to 8 parts by mass, the polysiloxane compound is a cyclic compound, the cyclic compound has a structure represented by formula (1): 【Chemical Formula 2】 formed by the cyclic linkage of the structure represented by, in the formula (1), R 1 and R 2is, independently of each other, a hydrogen atom, a hydroxy group, an alkyl group, a carbonyl group, an alkoxy group, a carboxylic acid ester group, or an acryloxy group, n is a real number of 3 or more and 5 or less, Method for manufacturing an all-solid-state battery.

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