Secondary battery and secondary battery manufacturing method

Abstract

To suppress lithium deposition within a solid electrolyte layer.SOLUTION: A secondary battery 1 includes a positive electrode layer 10, a negative electrode layer 20, a solid electrolyte layer (first solid electrolyte layer 30 and second solid electrolyte layer 40) that is provided between the positive electrode layer 10 and the negative electrode layer 20 and contains a solid electrolyte that allows lithium ions to move, and a separator 50 that is in contact with the solid electrolyte layer between the positive electrode layer 10 and the negative electrode layer 20. A plurality of holes are formed in the surface of the separator 50 for supplying the electrolyte solution contained inside the separator 50 to the solid electrolyte layer.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a secondary battery and a method for manufacturing the secondary battery. [Background technology]

[0002] In recent years, all-solid-state batteries using solid electrolytes have been developed as lithium-ion secondary batteries from the viewpoint of safety, etc. (See Patent Document 1.) In all-solid-state batteries, a solid electrolyte layer through which lithium ions can move is provided between a positive electrode layer and a negative electrode layer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-165328 Summary of the Invention [Problem to be solved by the invention]

[0004] In all-solid-state batteries, lithium may precipitate on the negative electrode layer side during charging. In particular, when an abnormality occurs, such as deterioration of the all-solid-state battery, lithium is not incorporated into the negative electrode layer and precipitates from the surface of the negative electrode layer in the form of dendrites (needle-shaped crystals). If the lithium precipitate in the solid electrolyte layer further progresses and reaches the positive electrode layer, an internal short circuit may occur.

[0005] The present invention has been made in view of these points, and has an object to suppress the deposition of lithium in a solid electrolyte layer. [Means for solving the problem]

[0006] In a first aspect of the present invention, there is provided a secondary battery comprising: a positive electrode layer; a negative electrode layer; a solid electrolyte layer provided between the positive electrode layer and the negative electrode layer and containing a solid electrolyte that allows lithium ions to move; and a separator in contact with the solid electrolyte layer between the positive electrode layer and the negative electrode layer, wherein a plurality of holes are formed in a surface of the separator for supplying an electrolytic solution contained inside the separator to the solid electrolyte layer.

[0007] The solid electrolyte layer may include a first solid electrolyte layer facing the positive electrode layer and a second solid electrolyte layer facing the negative electrode layer, and the separator may be sandwiched between the first solid electrolyte layer and the second solid electrolyte layer.

[0008] Furthermore, a first surface of the separator facing the first solid electrolyte layer may have a plurality of first holes formed therein for supplying the electrolytic solution to the first solid electrolyte layer, and a second surface of the separator facing the second solid electrolyte layer may have a plurality of second holes formed therein for supplying the electrolytic solution to the second solid electrolyte layer, and the size of the second holes may be different from the size of the first holes.

[0009] Furthermore, a first surface of the separator facing the first solid electrolyte layer may be formed with a plurality of first holes for supplying the electrolytic solution to the first solid electrolyte layer, and a second surface of the separator facing the second solid electrolyte layer may be formed with a plurality of second holes for supplying the electrolytic solution to the second solid electrolyte layer, and the spacing between the second holes may be different from the spacing between the first holes.

[0010] Furthermore, the first solid electrolyte contained in the first solid electrolyte layer may be different from the second solid electrolyte contained in the second solid electrolyte layer.

[0011] The battery may further include a fastening member that fastens the positive electrode layer and the negative electrode layer that are sandwiched between the solid electrolyte layer and the separator, and the separator may be pressurized by the fastening member via the positive electrode layer and the negative electrode layer.

[0012] The volume of the electrolyte may be the same as the volume of the gaps between the solid electrolyte particles inside the solid electrolyte layer.

[0013] The volume of the electrolyte may be smaller by a predetermined amount than the volume of the gaps between the solid electrolyte particles inside the solid electrolyte layer.

[0014] The plurality of holes may be formed at predetermined intervals over the entire surface of the separator.

[0015] In a second aspect of the present invention, there is provided a method for manufacturing a secondary battery, the method including the steps of: preparing a positive electrode layer, a negative electrode layer, a solid electrolyte layer containing a solid electrolyte that transfers lithium ions, and a separator containing an electrolytic solution therein; sandwiching the solid electrolyte layer and the separator between the positive electrode layer and the negative electrode layer so that they are in contact with each other; and fastening the positive electrode layer and the negative electrode layer together, and applying pressure to the separator, which has a plurality of holes that allow the electrolytic solution to be supplied to the solid electrolyte layer. [Effects of the Invention]

[0016] The present invention has the effect of suppressing the deposition of lithium in the solid electrolyte layer. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic diagram showing the configuration of a secondary battery 1 according to one embodiment. [Figure 2] 10 is a schematic diagram for explaining an internal short circuit in a secondary battery 100 according to a comparative example. FIG. [Figure 3] FIG. 2 is a schematic diagram illustrating the configuration of a separator 50. [Figure 4] 2 is a schematic diagram showing holes 53 in an upper surface 51a of a separator 50. FIG. [Figure 5] FIG. 2 is a schematic diagram showing a state in which lithium deposition is suppressed. [Figure 6]3 is a flowchart showing the manufacturing process of the secondary battery 1. [Figure 7] FIG. 10 is a schematic diagram showing a secondary battery 1 according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0018] <Structure of secondary battery> 1 is a schematic diagram showing the configuration of a secondary battery 1 according to one embodiment. The secondary battery 1 is a lithium-ion secondary battery in which the carrier ions are lithium ions. Specifically, the secondary battery 1 is an all-solid-state battery having a laminated structure in which a positive electrode layer, a negative electrode layer, and a solid electrolyte layer are sandwiched and integrated to achieve a high energy density of the battery.

[0019] As shown in FIG. 1, the secondary battery 1 includes a positive electrode layer 10, a negative electrode layer 20, a first solid electrolyte layer 30, a second solid electrolyte layer 40, a separator 50, and a fastening member 60.

[0020] The positive electrode layer 10 contains a positive electrode active material. Examples of the positive electrode active material that can be used include sulfur, lithium nickel oxide, lithium cobalt oxide, oxides of transition metals combined with lithium at a certain ratio, lithium manganese oxide, and lithium iron phosphate oxide. Examples of transition metals include nickel, cobalt, and manganese. The positive electrode layer 10 may also contain a solid electrolyte in addition to the positive electrode active material.

[0021] The negative electrode layer 20 contains a negative electrode active material. Specifically, the negative electrode active material is an alloy-based negative electrode such as hard carbon, graphite, or silicon, or metallic lithium. Note that, like the positive electrode layer 10, the negative electrode layer 20 may contain a solid electrolyte in addition to the negative electrode active material. The negative electrode layer 20 and the positive electrode layer 10 have the same shape, specifically, formed in a rectangular plate shape.

[0022] The first solid electrolyte layer 30 and the second solid electrolyte layer 40 are provided between the positive electrode layer 10 and the negative electrode layer 20. As shown in FIG. 1 , the first solid electrolyte layer 30 faces the positive electrode layer 10, and the second solid electrolyte layer 40 faces the negative electrode layer 20. Specifically, the first solid electrolyte layer 30 contacts the positive electrode layer 10, and the second solid electrolyte layer 40 contacts the negative electrode layer 20.

[0023] The first solid electrolyte layer 30 and the second solid electrolyte layer 40 have lithium ion conductivity. The first solid electrolyte layer 30 and the second solid electrolyte layer 40 contain a solid electrolyte that allows lithium ions to move therein. The solid electrolyte is, for example, a known oxide-based solid electrolyte or sulfide-based solid electrolyte.

[0024] The first solid electrolyte contained in the first solid electrolyte layer 30 facing the positive electrode layer 10 may be different from the second solid electrolyte contained in the second solid electrolyte layer 40 corresponding to the negative electrode layer 20. For example, the first solid electrolyte is an oxidation-resistant electrolyte, and the second solid electrolyte is a reduction-resistant electrolyte. However, without being limited to the above, the first solid electrolyte may be the same as the second solid electrolyte.

[0025] The separator 50 is provided between the positive electrode layer 10 and the negative electrode layer 20. Specifically, the separator 50 is sandwiched between the first solid electrolyte layer 30 and the second solid electrolyte layer 40. Here, the separator 50 is in contact with both the first solid electrolyte layer 30 and the second solid electrolyte layer 40. For example, the thickness of the separator 50 may be smaller than the thicknesses of the positive electrode layer 10, the negative electrode layer 20, the first solid electrolyte layer 30, and the second solid electrolyte layer 40. In this case, the rigidity of the separator 50 is lower than the rigidity of the positive electrode layer 10, the negative electrode layer 20, the first solid electrolyte layer 30, and the second solid electrolyte layer 40. Note that the relationship between the thickness and rigidity of the separator 50 is not limited to the above.

[0026] Separator 50, which will be described in detail later, is made of a porous substrate and contains an electrolytic solution therein, which makes it easier for the electrolytic solution inside separator 50 to be supplied to first solid electrolyte layer 30 and second solid electrolyte layer 40.

[0027] The fastening members 60 fasten the positive electrode layer 10 and the negative electrode layer 20. Specifically, the fastening members 60 fasten the positive electrode layer 10 and the negative electrode layer 20, which are sandwiched between the first solid electrolyte layer 30, the second solid electrolyte layer 40, and the separator 50. The fastening members 60 include bolts and nuts, and sandwich the positive electrode layer 10 and the negative electrode layer 20. The fastening members 60 are provided, for example, at the four corners of the rectangular positive electrode layer 10 and the negative electrode layer 20.

[0028] The fastening member 60 fastens the positive electrode layer 10 and the negative electrode layer 20, and thus the separator 50 sandwiched between the positive electrode layer 10 and the negative electrode layer 20 is pressed by the fastening member 60 through the positive electrode layer 10 and the negative electrode layer 20. The separator 50, which has low rigidity, is pressed by the fastening force of the fastening member 60 and is therefore prone to deformation. As the separator 50 deforms, the electrolyte solution inside it seeps out or becomes tarnished, and the seeped electrolyte solution is more likely to be supplied to the first solid electrolyte layer 30 and the second solid electrolyte layer 40.

[0029] <Separator detailed configuration> Before describing the detailed configuration of the separator 50 in this embodiment, lithium deposition that occurs in a secondary battery 100 according to a comparative example in which the separator 50 is not provided will be described with reference to FIG.

[0030] 2 is a schematic diagram for explaining an internal short circuit in a secondary battery 100 according to a comparative example. The secondary battery 100 has a configuration in which a positive electrode layer 110, a negative electrode layer 120, and a solid electrolyte layer 130 are stacked.

[0031] FIG. 2 shows an enlarged view of the area where lithium deposition occurred. Here, there is an uneven portion in the anode layer 120, and current concentrates in that portion, causing lithium deposition from that portion. As shown in the enlarged view of FIG. 2, lithium is deposited in the form of dendrites (needle-shaped crystals) within the solid electrolyte layer 130. As shown by the bold line in the enlarged view, the lithium deposited from the anode layer 120 travels through the gaps between the solid electrolyte particles 132 within the solid electrolyte layer 130 and reaches the cathode layer 110. When the deposited lithium reaches the cathode layer 110, an internal short circuit occurs between the anode layer 20 and the cathode layer 110.

[0032] The detailed configuration of the separator 50 according to this embodiment for suppressing the occurrence of the above-mentioned internal short circuit will be described with reference to FIGS. Fig. 3 is a schematic diagram for explaining the configuration of the separator 50. Fig. 4 is a schematic diagram showing holes 53 in the upper surface 51a of the separator 50.

[0033] The separator 50 contains an electrolytic solution therein. The electrolytic solution in the separator 50 is, for example, 1 mol / L LiPF6 EC / DMC. LiPF6 is lithium hexafluorophosphate, EC is ethylene carbonate, and DMC is dimethyl carbonate. The electrolytic solution in the separator 50 preferably has low volatility, and is, for example, a high-concentration electrolytic solution or an electrolytic solution using a low-boiling-point solvent. The electrolytic solution in the separator 50 preferably has a stable reaction with the deposited lithium and does not generate gas during the reaction.

[0034] Because the separator 50 is made of a porous substrate, the electrolytic solution in the separator 50 is supplied to the first solid electrolyte layer 30 and the second solid electrolyte layer 40 as shown by the arrows in Fig. 3. The electrolytic solution contained in the separator 50 is supplied to the first solid electrolyte layer 30 and the second solid electrolyte layer 40, for example, when manufacturing the secondary battery 1.

[0035] 1 , when the positive electrode layer 10, the first solid electrolyte layer 30, the separator 50, the second solid electrolyte layer 40, and the negative electrode layer 20 are stacked, and then the fastening member 60 fastens the positive electrode layer 10 and the negative electrode layer 20 together, the electrolyte solution in the separator 50 is supplied to the first solid electrolyte layer 30 and the second solid electrolyte layer 40. When the positive electrode layer 10 and the negative electrode layer 20 are fastened together by the fastening member 60, the separator 50 is deformed, which makes it easier for the electrolyte solution in the separator 50 to flow out into the first solid electrolyte layer 30 and the second solid electrolyte layer 40.

[0036] The electrolytic solution supplied into the first solid electrolyte layer 30 disperses so as to fill the gaps between the particles 32 that are solid electrolyte in the first solid electrolyte layer 30. Similarly, the electrolytic solution supplied into the second solid electrolyte layer 40 disperses so as to fill the gaps between the particles 42 that are solid electrolyte in the second solid electrolyte layer 40.

[0037] A plurality of holes 53 are formed on the surface of the separator 50 for supplying the electrolytic solution contained inside the separator 50 to the solid electrolyte layer. The plurality of holes 53 are formed at predetermined intervals across the entire surface of the separator 50. This makes it easier for the electrolytic solution to be uniformly supplied into the solid electrolyte layer through the holes 53.

[0038] The multiple holes 53 are formed on both the upper surface 51a and the lower surface 51b of the separator 50. The upper surface 51a of the separator 50 is the surface facing the first solid electrolyte layer 30, and the lower surface 51b is the surface facing the second solid electrolyte layer 40. Therefore, in this embodiment, the upper surface 51a corresponds to the first surface of the separator 50, and the lower surface 51b corresponds to the second surface.

[0039] As shown in the enlarged view of FIG. 4, a plurality of holes 53 are formed at predetermined intervals in the upper surface 51a. In FIG. 4, for convenience of explanation, the holes 53 are only shown in the enlarged view, but in reality, the holes 53 are formed over the entire upper surface 51a. Also, although the shape of the holes 53 is circular in FIG. 4, this is not limited and they may be rectangular or the like. The electrolyte solution in the separator 50 is supplied to the first solid electrolyte layer 30 through the holes 53 in the upper surface 51a. Note that, although the plurality of holes 53 are formed at predetermined intervals in the above description, this is not limited and the intervals between the holes 53 may be uneven.

[0040] Similar to the upper surface 51a, the lower surface 51b also has a plurality of holes 53 formed at predetermined intervals. The electrolytic solution in the separator 50 is supplied to the second solid electrolyte layer 40 through the holes 53 in the lower surface 51b. Although the above description has been given with the plurality of holes 53 in the lower surface 51b formed at predetermined intervals, the present invention is not limited thereto, and the intervals between the holes 53 may be uneven. In this embodiment, the holes 53 formed in the upper surface 51a correspond to first holes, and the holes 53 formed in the lower surface 51b correspond to second holes.

[0041] The electrolytic solution supplied from the separator 50 is dispersed so as to fill the gaps between the solid electrolyte particles 32, 42 in the first solid electrolyte layer 30 and the second solid electrolyte layer 40, thereby suppressing the deposition of lithium as shown in FIG. 5.

[0042] FIG. 5 is a schematic diagram showing a state in which lithium deposition is suppressed. In FIG. 5, the lithium deposition state is indicated by a thick line. Here, it is assumed that an electrolyte solution is dispersed in the first solid electrolyte layer 30 and the second solid electrolyte layer 40. Specifically, the electrolyte solution fills the gaps between the particles 32, 42. The lithium deposited from the anode layer 20 comes into contact with the electrolyte solution in the second solid electrolyte layer 40. When the lithium comes into contact with the electrolyte solution, the lithium and the electrolyte solution react to form a lithium compound with non-electron conductivity, thereby suppressing lithium deposition. This prevents the deposited lithium from reaching the cathode layer 10.

[0043] The size of the holes 53 in the lower surface 51b may be different from the size of the holes 53 in the upper surface 51a. For example, the size of the holes 53 in the lower surface 51b is larger than the size of the holes 53 in the upper surface 51a. In this case, the electrolyte solution is more easily supplied to the second solid electrolyte layer 40. As a result, it is easier to suppress the deposition of lithium in the second solid electrolyte layer 40. However, without being limited to the above, the size of the holes 53 in the upper surface 51a may be larger than the size of the holes 53 in the lower surface 51b.

[0044] Furthermore, the spacing between the holes 53 on the lower surface 51b may be different from the spacing between the holes 53 on the upper surface 51a. For example, the spacing between the holes 53 on the lower surface 51b may be smaller than the spacing between the holes 53 on the upper surface 51a. In this case, more holes 53 are formed on the lower surface 51b, making it easier to supply the electrolyte to the second solid electrolyte layer 40. As a result, it is easier to suppress lithium deposition in the second solid electrolyte layer 40. However, without being limited to the above, the spacing between the holes 53 on the upper surface 51a may be smaller than the spacing between the holes 53 on the lower surface 51b.

[0045] The volume of the electrolyte solution contained in the separator 50 is set in advance. For example, the volume of the electrolyte solution is the same as the volume of the gaps between the solid electrolyte (particles 32, 42) inside the first solid electrolyte layer 30 and the second solid electrolyte layer 40. This allows the electrolyte solution to fill all of the gaps in the solid electrolyte, thereby suppressing lithium precipitation inside the first solid electrolyte layer 30 and the second solid electrolyte layer 40.

[0046] However, without being limited to the above, the volume of the electrolyte solution may be smaller by a predetermined amount than the volume of the gaps between the solid electrolyte (particles 32, 42) inside the first solid electrolyte layer 30 and the second solid electrolyte layer 40. For example, the volume of the electrolyte solution may be the same as the volume of the gaps between the solid electrolyte inside the second solid electrolyte layer 40. Even in such a case, the electrolyte solution is distributed over a wide range inside the first solid electrolyte layer 30 and the second solid electrolyte layer 40, thereby suppressing lithium precipitation.

[0047] <Secondary battery manufacturing method> FIG. 6 is a flowchart showing the manufacturing process of the secondary battery 1.

[0048] First, an operator prepares the positive electrode layer 10, the negative electrode layer 20, the first solid electrolyte layer 30, the second solid electrolyte layer 40, and the separator 50 (step S102). Here, the separator 50 contains an electrolytic solution.

[0049] Next, the worker stacks the prepared positive electrode layer 10, negative electrode layer 20, first solid electrolyte layer 30, second solid electrolyte layer 40, and separator 50 (step S104). Specifically, the worker sandwiches the first solid electrolyte layer 30, the second solid electrolyte layer 40, and the separator 50 between the positive electrode layer 10 and the negative electrode layer 20 so that they are in contact with each other.

[0050] Next, the worker fastens the positive electrode layer 10 and the negative electrode layer 20 with the fastening member 60 and applies pressure to the separator 50 (step S106). By applying pressure to the separator 50, the electrolyte inside the separator 50 is supplied to the first solid electrolyte layer 30 and the second solid electrolyte layer 40 through the holes 53 on the surface of the separator 50. Because the amount of electrolyte supplied is proportional to the fastening force of the fastening member 60, the worker can adjust the fastening force of the fastening member 60 so that a desired amount of electrolyte inside the separator 50 is supplied to the first solid electrolyte layer 30 and the second solid electrolyte layer 40.

[0051] <Modification> The secondary battery 1 of the above-described embodiment has the first solid electrolyte layer 30 and the second solid electrolyte layer 40, but is not limited to this, and may have either the first solid electrolyte layer 30 or the second solid electrolyte layer 40.

[0052] FIG. 7 is a schematic diagram showing a secondary battery 1 according to a modified example. The secondary battery 1 according to the modified example has a positive electrode layer 10, a negative electrode layer 20, a second solid electrolyte layer 40, a separator 50, and a fastening member 60, but does not have a first solid electrolyte layer 30. The separator 50 is sandwiched between the positive electrode layer 10 and the second solid electrolyte layer 40. The separator 50 according to the modified example has the same configuration as the separator 50 shown in FIG. 1 described above. Specifically, the separator 50 contains an electrolytic solution, and a plurality of holes 53 (FIG. 4) are formed on the surface of the separator 50 for supplying the electrolytic solution to the second solid electrolyte layer 40.

[0053] In the modified example, the electrolytic solution in the separator 50 is also supplied to the second solid electrolyte layer 40 through the holes 53, so that the electrolytic solution is dispersed in the first solid electrolyte layer 30. As a result, even if lithium precipitates from the anode layer 20, the lithium comes into contact with and reacts with the electrolytic solution in the second solid electrolyte layer 40, thereby suppressing the progress of lithium precipitation in the second solid electrolyte layer 40. As a result, the precipitated lithium can be prevented from coming into contact with the cathode layer 10.

[0054] <Effects of this embodiment> The secondary battery 1 of the present embodiment described above has a separator 50 in contact with the solid electrolyte layers (specifically, both the first solid electrolyte layer 30 and the second solid electrolyte layer 40) disposed between the positive electrode layer 10 and the negative electrode layer 20. The separator 50 has a surface formed with a plurality of holes 53 for supplying the electrolyte solution contained inside the separator 50 to the solid electrolyte layers. In the above configuration, the electrolyte solution supplied from the separator 50 is dispersed in the solid electrolyte layer. Specifically, the electrolyte solution is dispersed among the solid electrolyte particles in the solid electrolyte layer. As a result, even if lithium precipitates from the anode layer 20, the lithium reacts with the electrolyte solution in the solid electrolyte layer to form a lithium compound, thereby suppressing the progression of lithium precipitation in the solid electrolyte layer. As a result, the precipitated lithium is prevented from coming into contact with the cathode layer 10, thereby preventing the occurrence of an internal short circuit.

[0055] The present invention has been described above using embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. For example, all or part of the device can be configured by functionally or physically distributing or integrating any unit. Furthermore, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effects of the new embodiments resulting from the combination also have the effects of the original embodiments. [Explanation of symbols]

[0056] 1 Secondary battery 10 Positive electrode layer 20 negative electrode layer 30 First solid electrolyte layer 40 Second solid electrolyte layer 50 Separator 51a Top side 51b Bottom side 53 holes 60 Fastening members

Claims

1. a positive electrode layer; a negative electrode layer; a solid electrolyte layer provided between the positive electrode layer and the negative electrode layer and including a solid electrolyte that allows lithium ions to move; a separator in contact with the solid electrolyte layer between the positive electrode layer and the negative electrode layer; Equipped with a plurality of holes are formed on the surface of the separator for supplying the electrolytic solution contained inside the separator to the solid electrolyte layer; Secondary battery.

2. the solid electrolyte layer includes a first solid electrolyte layer facing the positive electrode layer and a second solid electrolyte layer facing the negative electrode layer, The separator is sandwiched between the first solid electrolyte layer and the second solid electrolyte layer. The secondary battery according to claim 1 .

3. a first surface of the separator facing the first solid electrolyte layer has a plurality of first holes formed therein for supplying the electrolytic solution to the first solid electrolyte layer; a second surface of the separator facing the second solid electrolyte layer has a plurality of second holes formed therein for supplying the electrolytic solution to the second solid electrolyte layer; The size of the second hole is different from the size of the first hole. The secondary battery according to claim 2 .

4. a first surface of the separator facing the first solid electrolyte layer has a plurality of first holes formed therein for supplying the electrolytic solution to the first solid electrolyte layer; a second surface of the separator facing the second solid electrolyte layer has a plurality of second holes formed therein for supplying the electrolytic solution to the second solid electrolyte layer; The spacing between the second holes is different from the spacing between the first holes. The secondary battery according to claim 2 .

5. the first solid electrolyte contained in the first solid electrolyte layer is different from the second solid electrolyte contained in the second solid electrolyte layer; The secondary battery according to claim 2 .

6. a fastening member that fastens the positive electrode layer and the negative electrode layer, the positive electrode layer and the negative electrode layer sandwiching the solid electrolyte layer and the separator therebetween; the separator is pressed by the fastening member via the positive electrode layer and the negative electrode layer; The secondary battery according to claim 1 .

7. The volume of the electrolyte solution is the same as the volume of the gap between the solid electrolytes inside the solid electrolyte layer. The secondary battery according to claim 1 .

8. the volume of the electrolyte solution is smaller by a predetermined amount than the volume of the gap between the solid electrolytes inside the solid electrolyte layer; The secondary battery according to claim 1 .

9. The plurality of holes are formed at predetermined intervals over the entire surface of the separator. The secondary battery according to claim 1 .

10. preparing a positive electrode layer, a negative electrode layer, a solid electrolyte layer including a solid electrolyte that moves lithium ions, and a separator containing an electrolytic solution therein; sandwiching the solid electrolyte layer and the separator between the positive electrode layer and the negative electrode layer so that the solid electrolyte layer and the separator are in contact with each other; Pressurizing the separator, which has a plurality of holes for fastening the positive electrode layer and the negative electrode layer together and supplying the electrolyte to the solid electrolyte layer; The method for manufacturing a secondary battery comprising the steps of:

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