JP2012069248A - Manufacturing method for all-solid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for an all-solid battery enabling thinning and enlargement of a lithium-ion battery that is needed for providing a lithium-ion battery with improved performance and increased capacity and capable of preventing short-cut between both electrode material layers.SOLUTION: A manufacturing method for an all-solid battery in which a collector is arranged on each of both surfaces of a laminate formed by arranging a solid electrolyte layer between a positive electrode layer and a negative electrode layer, comprises a step of laminating a solid electrolyte 13 on a positive electrode mixture 12 comprising a positive electrode active material and a solid electrolyte, followed by pressure molding to obtain a positive electrode member 14, a step of laminating a solid electrolyte 23 on a negative electrode mixture 22 comprising a negative electrode active material and a solid electrolyte, followed by pressure molding to obtain a negative electrode member 24, and a step of performing pressure molding to the positive electrode member 14 and the negative electrode member 24 obtained in the above-mentioned steps by combining the solid electrolytes 13 and 23 each other, to manufacture the above-mentioned laminate.

Description

  The present invention relates to a method for manufacturing an all-solid battery.

  In recent years, there has been a strong demand for a secondary battery that can be used for a long time, is small in size and light in weight, and has high safety, with an increase in functionality of a mobile phone, a PDA, a notebook personal computer, and the like. As a battery that can meet these demands, there is a lithium secondary battery. However, a lithium secondary battery containing a flammable organic solvent that has been used conventionally has a risk of liquid leakage or ignition during overcharge or abuse. Therefore, ensuring the safety has been an important issue as the energy density of batteries increases.

  As a battery that solves such a problem, research and development of an all-solid battery using a solid electrolyte that is chemically stable and has no problem of leakage or ignition as compared with an organic electrolyte has been intensively conducted.

  By the way, as a manufacturing method of such an all-solid-state battery, a method is known in which powder of a constituent material of a battery is pressed into a pellet form (see, for example, Patent Document 1).

JP 2008-257932 A

  By the way, pressurizing the battery constituent material powder into a pellet form does not allow the powder to be spread thinly and uniformly, thus realizing the thinning / enlarging required for high performance / high capacity lithium ion batteries. There was a problem that could not be done.

  Furthermore, according to the conventional manufacturing method of an all-solid-state lithium ion secondary battery, after forming the positive electrode material layer (positive electrode mixture), the solid electrolyte layer is formed, and the negative electrode material layer (negative electrode mixture) is formed on the surface. Since the electrode material layer in the vicinity of the boundary between the electrode material layer and the solid electrolyte layer is naturally present, an active material is present. When the electrolyte is thin, the active material on one electrode material layer side may penetrate the solid electrolyte layer and short-circuit to the other electrode material layer.

  Accordingly, the present invention provides a method for manufacturing an all-solid-state battery capable of realizing thinning / enlarging necessary for high performance / high capacity of a lithium ion battery and preventing short-circuit between both electrode material layers. The purpose is to do.

In order to solve the above problems, the method for producing an all-solid-state battery according to claim 1 of the present invention includes stacking a solid electrolyte on a positive electrode mixture made of a positive electrode active material and a solid electrolyte, or on a positive electrode material made of a positive electrode active material. After that, a step of pressure forming to obtain a positive electrode member;
A step of obtaining a negative electrode member by pressure forming after laminating a solid electrolyte on a negative electrode mixture made of a negative electrode active material and a solid electrolyte, or on a negative electrode material made of a negative electrode active material;
And a step of pressure-molding the positive electrode member and the negative electrode member obtained in each of the above steps together with each solid electrolyte.

  Moreover, the manufacturing method of the all-solid-state battery of Claim 2 WHEREIN: In the manufacturing method of Claim 1, when carrying out the pressure molding of the positive electrode member and the negative electrode member together with each solid electrolyte, these are carried out. In this method, a solid electrolyte is further disposed between the two solid electrolytes.

  Moreover, the manufacturing method of the all-solid-state battery of Claim 3 WHEREIN: The manufacturing method of Claim 1 or 2 WHEREIN: The pressure at the time of pressurizing and forming a positive electrode member and a negative electrode member is respectively used as a positive electrode member and a negative electrode member. This is a method of making the pressure lower than the pressure at the time of pressure molding.

  The method for producing an all solid state battery according to claim 4 is the method for producing an all solid state battery according to any one of claims 1 to 3, wherein the solid of the electrode active material in at least one of the positive electrode mixture and the negative electrode mixture. In this method, the mixing ratio with respect to the electrolyte is decreased continuously or stepwise according to the distance from the current collector.

  A method for producing an all solid state battery according to claim 5 is a method in which the all solid state battery is a lithium ion secondary battery in the production method according to any one of claims 1 to 4.

  According to the manufacturing method according to claim 1, by laminating a solid electrolyte on each electrode mixture made of each electrode active material and a solid electrolyte, or on each electrode material made of each electrode active material, and by pressure forming After obtaining the electrode member, these two electrode members were combined and pressure-molded again, so that short-circuiting between the two electrodes could be prevented, and the solid electrolyte layer was made thinner and larger, and improved in performance. In addition, the capacity can be increased. That is, an all solid state battery having excellent charge / discharge characteristics can be obtained.

  Further, according to the manufacturing method according to claim 2, since the solid electrolyte is disposed between the positive electrode member and the negative electrode member, the adhesion between the solid electrolytes in contact with the positive electrode member or the negative electrode member is improved, so that the ion conductivity is improved. Get higher.

  Further, according to the manufacturing method according to claim 3, after performing preliminary molding with a low pressure to adjust the shape by pressure molding in the positive electrode member or the negative electrode member, the positive electrode member and the negative electrode member are combined, and Since the final pressure molding is performed at a pressure higher than the pressure during the pressure molding, the adhesion between the positive electrode member or the negative electrode member and the solid electrolyte layer in contact with the positive electrode member or the negative electrode member can be further improved.

  Furthermore, according to the manufacturing method according to claim 4, when the mixing ratio of the solid electrolyte in the portion in contact with the solid electrolyte among the electrode members is increased, the active material penetrating the solid electrolyte is relatively reduced, so that a short circuit is caused. The probability of occurrence is significantly reduced, and as a result, a thin solid electrolyte layer can be formed. Therefore, even when pressure forming is performed by pressing, it is possible to prevent the electrode active material in one electrode member from penetrating the solid electrolyte layer and short-circuiting with the other electrode member.

  From another viewpoint, since lithium ions move smoothly near the solid electrolyte layer and electrons move near the current collector, the resistance of the entire battery can be lowered. In other words, ion conduction is likely to be performed in a portion close to the solid electrolyte layer, and conversely, electron conduction is likely to be performed in a portion far from the solid electrolyte layer, thereby improving ion conductivity and electron conductivity in the electrode member. be able to.

It is sectional drawing which shows the basic composition of the all-solid-state lithium ion secondary battery which concerns on Embodiment 1 of this invention. 3 is a cross-sectional view showing a schematic configuration of the all solid-state lithium ion secondary battery according to Embodiment 1. FIG. 5 is a schematic cross-sectional view illustrating the method for manufacturing the secondary battery according to the first embodiment. FIG. 5 is a schematic cross-sectional view illustrating the method for manufacturing the secondary battery according to the first embodiment. FIG. It is a schematic cross section explaining the manufacturing method of the all-solid-state lithium ion secondary battery which concerns on Embodiment 2 of this invention.

Hereinafter, the manufacturing method of the all-solid-state battery which concerns on Embodiment 1 of this invention is demonstrated based on drawing.
In the first embodiment, the case where the all solid state battery is a lithium ion secondary battery, that is, the case where it is an all solid state lithium ion secondary battery will be described.

First, the basic configuration of an all-solid lithium ion secondary battery will be described with reference to FIG.
In this all-solid-state lithium ion secondary battery, a solid electrolyte layer 3 made of a lithium ion conductive solid electrolyte that is an inorganic solid electrolyte is disposed (laminated) between a positive electrode layer 1 and a negative electrode layer 2. The positive electrode current collector 4 is disposed (laminated) on the surface opposite to the electrolyte layer 3, and the negative electrode current collector 5 is disposed (laminated) on the surface of the negative electrode layer 2 opposite to the solid electrolyte layer 3.

  For the positive electrode layer 1, a mixture of a positive electrode active material and a lithium ion conductive solid electrolyte or only a positive electrode active material is used. For the negative electrode layer 2, a negative electrode active material and a lithium ion conductive solid electrolyte are used. Or the negative electrode active material alone, and the constituent materials (raw materials) of each of the electrode layers 1 and 2 and the solid electrolyte layer 3 are powdery materials.

Hereinafter, based on the above basic configuration, the configuration of the all-solid-state battery according to the first embodiment will be described with reference to FIG.
In the following, as shown in FIG. 2, a mixture of a positive electrode active material and a lithium ion conductive solid electrolyte is a positive electrode mixture 12, and a lithium ion conductive solid electrolyte (layer) 13 is laminated on the positive electrode mixture 12. Is a positive electrode member 14, and the positive electrode member 14 disposed on the surface of the positive electrode current collector 11 is referred to as a positive electrode side member 15. A mixture of a negative electrode active material and a lithium ion conductive solid electrolyte is a negative electrode mixture 22. A negative electrode member 24 in which a lithium ion conductive solid electrolyte (layer) 23 is laminated on the negative electrode mixture 22, and a negative electrode side member 25 in which the negative electrode member 24 is disposed on the surface of the negative electrode current collector 21. Each will be described.

As the positive electrode active material in the positive electrode mixture 12, for example, lithium cobaltate (LiCoO ₂ ), lithium nickelate (LiNiO ₂ ), lithium manganate (LiMnO ₂ ), and the like are used in the oxide system. On the other hand, graphite such as natural graphite, artificial graphite, graphite carbon fiber, and resin-fired carbon is used as the negative electrode active material in the negative electrode mixture 22.

  The above lithium ion conductive solid electrolytes are not particularly limited, and for example, materials composed of organic compounds, inorganic compounds, or both organic and inorganic compounds can be used, and those known in the field of lithium ion batteries can be used. Can be used. In particular, it is known that sulfide-based inorganic solid electrolytes have higher ionic conductivity than other inorganic compounds.

  As the positive electrode current collector 11 and the negative electrode current collector 21, a plate shape made of copper, magnesium, stainless steel, titanium, iron, cobalt, nickel, zinc, aluminum, germanium, indium, lithium, tin, or an alloy thereof. A body or foil is used. In addition, a film formed by forming each of the above materials can also be used.

Next, the manufacturing method of an all-solid-state lithium ion secondary battery is demonstrated.
This manufacturing method includes a step of laminating a solid electrolyte 13 on a positive electrode mixture 12 made of a positive electrode active material and a solid electrolyte (or a positive electrode material made of a positive electrode active material), and then pressure forming to obtain a positive electrode member 14; After the solid electrolyte 23 is laminated on the negative electrode mixture 22 made of the negative electrode active material and the solid electrolyte (or on the negative electrode material made of the negative electrode active material), the step of pressing to obtain the negative electrode member 24 and the above steps are obtained. The positive electrode member 14 and the negative electrode member 24 are formed by press-molding the solid electrolytes 13 and 23 together, and the positive electrode member 14 is laminated on the positive electrode current collector 11 to form the positive electrode side member 15. And obtaining the negative electrode side member 25 by laminating the negative electrode member 24 on the negative electrode current collector 21.

Hereinafter, a specific example of the manufacturing method of the all solid lithium ion secondary battery will be described.
As the positive electrode current collector 11, a 14 mm square porous aluminum foil is used, and as the positive electrode active material, LiNi _0.8 Co _0.15 Al _0.05 O ₂ vacuum-dried in a constant temperature bath at 120 ° C. (Powder having an average particle diameter of 6 μm) is used, and as the lithium ion conductive solid electrolyte, for example, a mixed powder material of Li ₂ S (80 mol%)-P ₂ S ₅ (20 mol%) is used. The positive electrode active material and the lithium ion conductive solid electrolyte are mixed at a predetermined weight ratio, for example, 7 to 3.

  Then, as shown in FIG. 3, the mixed powder material having such a mixing ratio is formed into a dry film with a size of 10 mm square on the surface of the positive electrode current collector 11, and at a pressure of 1050 MPa by a single action press. The positive electrode mixture 12 having a thickness of about 70 μm was obtained by pressure molding. The insulating film 31 is hung so that the positive electrode current collector 11 and the negative electrode current collector 21 do not cause a short circuit.

Further, as the negative electrode current collector 21, a copper foil having a roughened surface of 14 mm square is used, and as the negative electrode active material, graphite (powder having an average particle diameter of 25 μm) vacuum-dried in a constant temperature bath at 120 ° C. ) And a mixed powder material of, for example, Li ₂ S (80 mol%)-P ₂ S ₅ (20 mol%) is used as the lithium ion conductive solid electrolyte. The positive electrode active material and the lithium ion conductive solid electrolyte are mixed at a predetermined weight ratio, for example, 6 to 4.

  Then, as shown in FIG. 4, the mixed powder material having such a mixing ratio is formed into a dry film with a size of 12 mm square on the surface of the negative electrode current collector 21, and the pressure is 1050 MPa by a single action press. The negative electrode mixture 22 having a thickness of about 100 μm was obtained by pressure molding.

Further, as the constituent material of each of the solid electrolytes (layers) 13 and 23, the same mixed powder material of Li ₂ S (80 mol%)-P ₂ S ₅ (20 mol%) as described above is used.
Then, as shown in FIG. 3 and FIG. 4, this solid electrolyte mixed powder material is formed into a dry type film with a size of 10 mm square on the positive electrode mixture 12 and 12 mm square on the negative electrode mixture, The solid electrolytes (layers) 13 and 23 having a thickness of about 15 μm were obtained by pressure molding at a pressure of 30 MPa by a single action press.

  Next, the positive electrode side member 15 and the negative electrode side member 25 obtained by the above-described steps are aligned and bonded so that the portions of the solid electrolyte layers 13 and 23 are in contact with each other to obtain a laminate. After that, it is sealed in a laminate cell having a positive electrode lead and a negative electrode lead. When sealing the laminate cell, the positive electrode side member 15 and the negative electrode side member 25 were pressurized with a pressure of 1050 MPa while the gas in the laminate cell was sucked with a vacuum pump, and then sealed.

The laminate cell thus obtained was charged in a thermostat at 30 ° C. under the conditions of a charge end voltage of 4.2 V, a discharge end voltage of 2.0 V, and a charge / discharge current of 0.1 mA / cm ² . Discharge was performed to determine the initial charge / discharge capacity. Specifically, the results of determining the solid electrolyte adhesion amount (thickness) in the solid electrolyte layer, the charge / discharge capacity under pressure at 600 kg / cm ² , and the charge / discharge capacity under no pressure (laminate cell only) Is shown in [Table 1] below. In addition, the result of the secondary battery obtained by a conventional method (the positive electrode composite material layer, the solid electrolyte layer and the negative electrode composite material layer were sequentially laminated and then press-formed) is described as Comparative Example 1. Yes.

［表１］から分かるように、比較例１に係る二次電池では短絡が生じたのに対して、実施の形態１（実施例１として記載）に係る二次電池では、それぞれ良好な値が得られた。また、固体電解質層の厚さについても、薄くしても良好な値が得られているのが分かる。

As can be seen from [Table 1], the secondary battery according to Comparative Example 1 has a short circuit, whereas the secondary battery according to Embodiment 1 (described as Example 1) has good values. Obtained. It can also be seen that good values are obtained even if the thickness of the solid electrolyte layer is reduced.

According to the above-described secondary battery manufacturing method, the following effects can be obtained.
When obtaining the positive electrode layer and the negative electrode layer, an electrode member was obtained by laminating a solid electrolyte on an electrode mixture made of an electrode active material and a solid electrolyte, or on an electrode material made of an electrode active material, and pressure forming. Later, these two electrode members were put together and pressure-molded again, so that short-circuiting between the two electrodes could be prevented, and the solid electrolyte layer was made thinner and larger, and improved in performance and capacity. Can be achieved. That is, an all-solid battery excellent in charge / discharge characteristics (battery performance) can be obtained. In addition, the short circuit prevention between both electrodes will be described more specifically. By pressing the electrode material and the solid electrolyte in advance, the surface (bonding surface) of the solid electrolyte becomes flat (there is little unevenness), and the electrode A short circuit due to the material particles penetrating the solid electrolyte can be prevented.

  Moreover, after performing preliminary molding at a low pressure to adjust the shape by pressure molding in the positive electrode member or the negative electrode member, the positive electrode member and the negative electrode member are combined and higher than the pressure at the time of the preliminary molding. Since the final pressure forming is performed by pressure (in other words, the pressure when forming the positive electrode member and the negative electrode member by pressure is the same as when forming the positive electrode member and the negative electrode member together by pressure forming. Thus, the adhesion between the solid electrolyte layers in contact with the positive electrode member or the negative electrode member can be further improved.

In addition, it will become as follows if the said manufacturing method is expressed from another viewpoint.
In other words, this manufacturing method includes a current collector on both surfaces of a laminate in which a solid electrolyte layer is disposed between a positive electrode layer (positive electrode mixture or positive electrode material) and a negative electrode layer (negative electrode mixture or negative electrode material). In the method for producing an all-solid battery in which each is disposed,
A step of obtaining a positive electrode member by pressure forming after laminating a solid electrolyte on a positive electrode mixture made of a positive electrode active material and a solid electrolyte, or on a positive electrode material made of a positive electrode active material;
A step of obtaining a negative electrode member by pressure forming after laminating a solid electrolyte on a negative electrode mixture made of a negative electrode active material and a solid electrolyte, or on a negative electrode material made of a negative electrode active material;
This is a method for producing the laminate by a step of pressure-molding the positive electrode member and the negative electrode member obtained in the respective steps together with the respective solid electrolytes.

Next, a method for manufacturing an all solid state battery according to Embodiment 2 of the present invention will be described.
In the first embodiment, the solid electrolyte layer is formed on each of the positive electrode mixture and the negative electrode mixture, and each solid electrolyte layer is bonded to be in contact with each other. In No. 2, a lithium ion conductive solid electrolyte (layer) is further disposed between the positive electrode member and the negative electrode member. As a manufacturing method, when the positive electrode member and the negative electrode member are pressure-molded together with the solid electrolytes, a solid electrolyte is further disposed between the two solid electrolytes.

The manufacturing method of the all-solid-state battery according to the second embodiment is described as a process as follows.
This manufacturing method includes a step of laminating a solid electrolyte on a positive electrode mixture made of a positive electrode active material and a solid electrolyte (or a positive electrode material made of a positive electrode active material), and then pressure forming to obtain a positive electrode member; And a step of obtaining a negative electrode member by pressure molding after laminating a solid electrolyte on a negative electrode mixture made of a solid electrolyte (or a negative electrode material made of a negative electrode active material), and collecting the positive electrode member (or positive electrode material) into a positive electrode assembly A step of obtaining a positive electrode side member by laminating on an electric body, a step of obtaining a negative electrode side member by laminating the negative electrode member (or the negative electrode material) on a negative electrode current collector, and a positive electrode side member ( A step of obtaining a green electrolyte layer by disposing a solid electrolyte on the surface (which is the surface of the solid electrolyte) of either the positive electrode member or the negative electrode side member (which may be the negative electrode member) And this unformed solid electrolyte layer is formed. And that is one of the pole side member and the other pole side member and a and method and a step of pressure molding to fit in contact solid electrolyte together.

Specifically, the differences from the first embodiment will be described. As shown in FIG. 5, lithium ion conduction is performed on the surface of the molded solid electrolyte layer 23 in the negative electrode member 24 manufactured by the same method as in the first embodiment. An unshaped solid electrolyte layer 41 that is not pressure-molded is formed by arranging a conductive solid electrolyte in a 12 mm square size with a dry thickness and a predetermined thickness (the surface of the molded solid electrolyte layer 13 in the positive electrode member 14) An unshaped solid electrolyte layer 41 may be formed on the substrate). As a constituent material of the unshaped solid electrolyte 41, Li ₂ S (80 mol%)-P ₂ S ₅ (20 mol%) similar to that in Embodiment 1 was used. In addition, about a member number, the same number is attached | subjected and demonstrated to the same member as Embodiment 1. FIG.

  Then, the positive electrode side member 15 obtained in the above-described step and the negative electrode side member 25 on which the unformed solid electrolyte layer 41 is disposed are aligned and pasted so that the respective solid electrolyte layer portions are in contact with each other. After forming a laminated body together, it is sealed in a laminate cell having a positive electrode lead and a negative electrode lead. In addition, when enclosing these in a lamination cell, it sealed, after pressurizing with the pressure of 1050 Mpa, attracting | sucking the gas in a lamination cell with a vacuum pump.

The laminate cell thus obtained was charged in a thermostat at 30 ° C. under the conditions of a charge end voltage of 4.2 V, a discharge end voltage of 2.0 V, and a charge / discharge current of 0.1 mA / cm ² . Discharge was performed to determine the initial charge / discharge capacity. Specifically, the solid electrolyte adhesion amount (thickness) in the solid electrolyte layer, the charge / discharge capacity under a pressure of 600 kg / cm ² , and the charge / discharge capacity under no pressure are shown in the following [Table 2]. Shown in In addition, the result of the secondary battery obtained by the conventional method (the positive electrode mixture layer, the solid electrolyte layer, and the negative electrode mixture layer were sequentially laminated and then pressure-formed) was compared with the result of Comparative Example 1 (embodiment). 1 is a comparative example).

［表２］から分かるように、実施の形態１の場合と同様に、比較例１に係る二次電池では短絡が生じたのに対して、実施の形態２（実施例２として記載）に係る二次電池では、それぞれ良好な値が得られた。また、固体電解質層の厚さについても、薄くしても良好な値が得られているのが分かる。

As can be seen from [Table 2], as in the case of the first embodiment, the secondary battery according to the comparative example 1 is short-circuited, whereas the second embodiment (described as the second embodiment) is involved. Good values were obtained for the secondary batteries. It can also be seen that good values are obtained even if the thickness of the solid electrolyte layer is reduced.

According to the manufacturing method of the second embodiment described above, the following effects are obtained in addition to the effects obtained in the first embodiment.
That is, since the solid electrolyte is disposed between the positive electrode member and the negative electrode member, the adhesion between the solid electrolyte layers in contact with the positive electrode member or the negative electrode member is improved, so that the ion conductivity is increased.

Moreover, even when used (charge / discharge) under no pressure (only the laminate cell), excellent charge / discharge characteristics can be obtained.
By the way, in each of the above-described embodiments, the electron conductivity was improved by using a porous aluminum foil. However, for example, by using a soft metal as a material, the electrode material is bitten into the current collector, so that the adhesion is improved. It is also possible to improve the property, that is, improve the electron conductivity.

Further, by roughening the surface of the current collector mechanically (grinding) or chemically (etching), higher adhesion, that is, higher electron conductivity can be obtained.
In each of the above embodiments, the positive electrode mixture and the negative electrode mixture are configured by mixing each electrode active material and the solid electrolyte. However, the mixing ratio of the electrode active material to the solid electrolyte Depending on the distance from the body (that is, depending on the thickness direction of the constituent material), it may be decreased continuously or stepwise. Specifically, the mixing ratio is inclined (tilted distribution) so that the electrode active material increases in the portion closer to the current collector. Note that the mixing ratio may be changed by either the positive electrode mixture or the negative electrode mixture.

  By inclining the mixing ratio in this way, when the mixing ratio of the solid electrolyte in the portion in contact with the solid electrolyte among the electrode members is increased, the active material penetrating the solid electrolyte is relatively decreased, and thus a short circuit occurs. The probability is significantly reduced, and as a result, a thin solid electrolyte layer can be formed. Therefore, even when pressure forming is performed by pressing, it is possible to prevent the electrode active material in one electrode member from penetrating the solid electrolyte layer and short-circuiting with the other electrode member.

  From another viewpoint, since lithium ions move smoothly near the solid electrolyte layer and electrons move near the current collector, the resistance of the entire battery can be lowered. In other words, ion conduction is likely to be performed in a portion close to the solid electrolyte layer, and conversely, electron conduction is likely to be performed in a portion far from the solid electrolyte layer, thereby improving ion conductivity and electron conductivity in the electrode member. be able to.

  Further, in each of the above embodiments, the positive electrode side is described as the positive electrode mixture and the negative electrode side is described as the negative electrode mixture. However, as shown in parentheses in the embodiment, the electrode active material and the solid electrolyte are Instead of the electrode mixture formed by mixing, an electrode material (positive electrode material, negative electrode material) composed only of an electrode active material may be used.

11 Positive Electrode Current Collector 12 Positive Electrode Compound 13 Solid Electrolyte (Layer)
14 Positive Electrode Member 15 Positive Electrode Side Member 21 Negative Electrode Current Collector 22 Negative Electrode Compound 23 Solid Electrolyte (Layer)
24 Negative electrode member 25 Negative electrode side member 31 Insulating film 41 Unformed solid electrolyte layer

Claims (5)

A step of obtaining a positive electrode member by pressure forming after laminating a solid electrolyte on a positive electrode mixture made of a positive electrode active material and a solid electrolyte, or on a positive electrode material made of a positive electrode active material;
A step of obtaining a negative electrode member by pressure forming after laminating a solid electrolyte on a negative electrode mixture made of a negative electrode active material and a solid electrolyte, or on a negative electrode material made of a negative electrode active material;
A method for producing an all-solid-state battery, comprising: forming a positive electrode member and a negative electrode member obtained in each of the above steps together by pressing each solid electrolyte together.   2. The all-solid-state battery according to claim 1, wherein when the positive electrode member and the negative electrode member are pressure-molded together with the solid electrolytes, a solid electrolyte is further disposed between the two solid electrolytes. Manufacturing method.   3. The total pressure according to claim 1, wherein a pressure at which the positive electrode member and the negative electrode member are respectively formed under pressure is set lower than a pressure at which the positive electrode member and the negative electrode member are pressure-molded together. A method for producing a solid state battery.   The mixing ratio of the electrode active material to the solid electrolyte in at least one of the positive electrode mixture and the negative electrode mixture is continuously or stepwise reduced according to the distance from the current collector. Item 4. The method for producing an all solid state battery according to any one of Items 1 to 3.   The method for producing an all solid state battery according to any one of claims 1 to 4, wherein the all solid state battery is a lithium ion secondary battery.

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