JP2021190390A - All-solid battery - Google Patents

Abstract

To provide a high-reliability electrode body equipped sulfide-based all-solid battery at low cost and efficiently even if burrs exist in a collector.SOLUTION: An all-solid battery comprises a sulfide-based solid electrolyte as a solid electrolyte. The all-solid battery comprises an electrode body including: a main laminate part 80 in which a positive electrode active material layer 24 and a negative electrode active material layer 44 are laminated via a solid electrolyte layer 30; a negative electrode collector extension part 60 extending from the main laminate part; and a terminal laminate part 50 which is a laminate part formed in a terminal of the negative electrode collector extension part and formed by providing a negative electrode collector exposed portion 62 in which the negative electrode collector extension part is exposed, between the terminal laminate part and the main laminate part 80. The terminal laminate part 50 is formed by successively laminating the negative electrode active material layer 44 and the solid electrolyte layer 30 and does not include the positive electrode active material layer 24 and a positive electrode collector 22.SELECTED DRAWING: Figure 2

Description

The present invention relates to an all-solid-state battery provided with a sulfide-based solid electrolyte (hereinafter, also referred to as “sulfide-based all-solid-state battery”). More specifically, the present invention relates to a sulfide-based all-solid-state battery having an electrode body in which a positive electrode and a negative electrode are laminated via a solid electrolyte layer.

In recent years, secondary batteries such as lithium ion secondary batteries have been used as vehicle drive power sources for electric vehicles (EVs), hybrid vehicles (HVs), plug-in hybrid vehicles (PHVs) and the like. In a lithium ion secondary battery, lithium ions, which are electrolyte ions, move back and forth between the positive and negative electrodes to charge and discharge, and when lithium ions are released from the negative electrode active material and stored in the positive electrode active material, an electrochemical reaction occurs. The current can be taken out to the external circuit based on. Conventionally, a liquid non-aqueous electrolyte solution has been mainly used as the electrolyte, but the non-aqueous electrolyte solution is flammable while it can form a good reaction interface when the active material gets wet. It requires careful handling. Therefore, a so-called all-solid-state battery using a solid solid electrolyte that does not require such a flammable non-aqueous electrolyte solution is being energetically put into practical use.

This type of all-solid-state battery typically comprises a positive electrode with a positive electrode collector and a positive electrode active material layer formed on the positive electrode collector, a negative electrode collector and the negative electrode collector. The negative electrode provided with the negative electrode active material layer formed in the above is provided with a laminated electrode body configured by being laminated in a predetermined number with a solid electrolyte layer interposed therebetween.
Further, the solid electrolyte layer and the positive / negative active material layer contain a solid electrolyte such as a sulfide-based solid electrolyte. Sulfide-based solid electrolytes have high ionic conductivity and are attracting attention for increasing the output of batteries. For example, Patent Document 1 below describes a technique using a sulfide-based solid electrolyte.

Japanese Unexamined Patent Publication No. 2017-004914

By the way, as the current collector used in such an all-solid-state battery, an Al foil, a SUS foil or the like cut into a predetermined shape is used as a positive electrode current collector, and on the other hand, a predetermined shape is used as a negative electrode current collector. Cut Cu foil or the like is used.
When the current collector is manufactured by processing such as cutting as described above, unexpected burrs (that is, additional parts such as protrusions and warpage generated when the material is processed) are formed on the edge portion of the current collector. May occur. When the current collector having such burrs is used as it is with the sulfide-based solid electrolyte, there are the following problems. For example, when a Cu foil having burrs is used as a current collector, when the temperature of the electrode body rises due to charging / discharging or the like, the sulfur (S) component of the sulfide-based solid electrolyte contained in the solid electrolyte layer and the collecting thereof. Copper (II) sulfide (CuS) having electron conductivity can be produced by reacting with Cu of an electric body. Such CuS diffuses starting from the apex of the burr of the current collector and can reach the current collector on the opposite electrode side from the apex of the burr, so that a short circuit may occur.

Therefore, when burrs are present in a current collector such as Cu foil, it is necessary to remove the burrs before manufacturing the electrode body, and it takes a lot of labor and cost to inspect the burrs and remove the burrs.
Therefore, it is a main object of the present invention to provide a sulfide-based all-solid-state battery provided with a highly reliable electrode body at low cost and efficiently even if burrs are present in the current collector.

The following all-solid-state batteries are provided to achieve the above-mentioned objectives.
The all-solid-state battery disclosed here is formed on a positive electrode including a positive electrode current collector, a positive electrode active material layer formed on the positive electrode current collector, a negative electrode current collector, and a negative electrode current collector. The negative electrode including the negative electrode active material layer is provided with a laminated electrode body laminated via a solid electrolyte layer. Further, the solid electrolyte includes a sulfide-based solid electrolyte. The laminated electrode body is a current collector of either a main laminated portion in which the positive electrode active material layer and the negative electrode active material layer are laminated via the solid electrolyte layer, or a positive or negative electrode extending from the main laminated portion. It is a laminated portion formed at the end of the stretched portion and the current collector stretched portion, and is formed by providing a current collector exposed portion where the current collector stretched portion is exposed between the main laminated portion. It is provided with a terminal laminated portion. The terminal laminated portion is formed by laminating an active material layer having the same electrode as the current collector stretched portion and a solid electrolyte layer in this order, and the active material layer on the counter electrode side and the current collector on the counter electrode side. It is characterized by not including the body.

According to the all-solid-state battery provided with the electrode body having such a configuration, the stretched portion of the current collector has a terminal laminated portion. As a result, even if a burr exists in the current collector and CuS or the like having electron conductivity spreads from the apex of the burr, it does not have conduction with the current collector on the opposite electrode side, so that a short circuit is prevented. Can be. Therefore, even if burrs are present in the current collector, it is possible to efficiently provide a sulfide-based all-solid-state battery provided with a highly reliable electrode body at low cost.

It is a figure which schematically explains the structure of the all-solid-state battery provided with the laminated electrode body. It is explanatory drawing which shows typically a part of the laminated electrode body included in the all-solid-state battery which concerns on one Embodiment. It is explanatory drawing which shows typically a part of the laminated electrode body included in the all-solid-state battery which concerns on one Embodiment. It is explanatory drawing which shows typically the part of the laminated electrode body provided with the conventional all-solid-state battery. It is explanatory drawing which shows a part of the laminated electrode body included in the all-solid-state battery of sample 14 schematically.

Hereinafter, preferred embodiments of the all-solid-state battery disclosed herein will be described in detail with reference to the drawings as appropriate. Matters other than those specifically mentioned in the present specification and necessary for the implementation of the technique disclosed herein can be grasped as design matters of a person skilled in the art based on the prior art in the art. The present invention can be carried out based on the contents disclosed in the present specification and the common general technical knowledge in the art.
The following embodiments are not intended to limit the techniques disclosed herein. Further, in the drawings shown in the present specification, the same reference numerals are given to the members / parts having the same action. The dimensional relations (length, width, thickness, etc.) in each drawing do not reflect the actual dimensional relations.

(1) Structure of an all-solid-state battery FIG. 1 schematically shows an all-solid-state battery 1 provided with a laminated electrode body 10 having a typical laminated structure. Roughly speaking, the all-solid-state battery 1 according to the present embodiment has a laminated electrode body 10 in which a positive electrode 20 and a negative electrode 40 are laminated in a predetermined number while interposing a solid electrolyte layer 30. It is a battery configured to be housed in a predetermined housing (battery case).

(2) Laminated electrode body FIG. 2 is an explanatory diagram schematically showing a part of the laminated electrode body 10. It should be noted that the figures (FIGS. 2 to 5) after FIG. 2 all show a part constituting the laminated electrode body 10, and are a negative electrode current collector, a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer, and a positive electrode collection. It has a structure in which electric bodies are stacked in this order.
As shown in FIG. 2, the laminated electrode body 10 has a main laminated portion 80 formed by laminating a positive electrode active material layer 24 and a negative electrode active material layer 44 via a solid electrolyte layer 30, and the main laminated portion. It has a negative electrode current collector stretched portion 60 stretched from the above and a terminal laminated portion 50 formed at the end of the negative electrode current collector stretched portion. The terminal laminated portion 50 is formed by laminating the negative electrode active material layer 44 and the solid electrolyte layer 30 in this order, and is characterized by not including the positive electrode active material layer 22 and the positive electrode current collector 24. Further, the terminal laminated portion 50 is formed so as to cover the burr 70 existing at the end of the negative electrode current collector extending portion 60. A negative electrode current collector exposed portion 62 in which the negative electrode current collector extending portion 60 is exposed is formed between the terminal laminated portion 50 and the main laminated portion 80.

According to the all-solid-state battery 1 provided with the laminated electrode body 10 having such a configuration, the electron conductive substance (for example, CuS, NiS, etc.) is diffused starting from the burr 70 existing at the end of the negative electrode current collector extending portion 60. However, since it does not have continuity with the positive electrode current collector 22, a short circuit can be prevented.
Although not particularly limited, as a method for producing the laminated electrode body 10, for example, a predetermined number of main laminated portions 80 and terminal laminated portions 50 separately formed on the surface of the negative electrode current collector 42 are manufactured, and the negative electrode is used. A method of superimposing the current collectors 42 on each other (or the positive electrode current collectors 22), or the negative electrode active material layer 44 and the solid on the entire negative electrode current collector 42 (including the negative electrode current collector extension portion 60). After forming 30 layers of electrolyte and removing only the exposed portion 62 of the negative electrode current collector by a physical method (laser trimming), a predetermined number of the main laminated portions 80 are formed, and the negative electrode current is collected. Examples thereof include a method of superimposing the bodies 42 (or the positive electrode current collectors 22) on each other.

(3) Solid electrolyte layer The solid electrolyte layer 30 contains a sulfide-based solid electrolyte. As the sulfide-based solid electrolyte, for example, various compounds having lithium ion conductivity but not electron conductivity can be preferably used. Such sulfide-based solid electrolyte, for _{example, Li 2 S-SiS 2,} LiI-Li 2 S-SiS 2, LiI-Li 2 S-P 2 S 5, LiI-Li 2 S-B 2 S 3, Li _{3 PO 4 -Li 2 S-Si} 2 S, Li 3 PO 4 -Li 2 S-SiS 2, LiPO 4 -Li 2 S-SiS, LiI-Li 2 S-P 2 O 5, LiI-Li 3 PO 4 _{-P 2 S 5, LiI-Li} 3 PS 4 -LiBr, Li 2 S-P 2 S 5, Li 2 S-P 2 S 5 -LiI-LiBr and _{Li 2 S-P 2 S 5} -GeS 2 etc. Amorphous sulfides, crystalline sulfides such as Li ₁₀ GeP ₂ S _{12 and the} like can be mentioned. Among them, a sulfide-based solid electrolyte made of amorphous sulfide can be particularly preferably used because it has excellent lithium ion conductivity.

Further, in addition to the above components, the solid electrolyte layer 30 may contain other components, for example, a binder (binding agent), various additives, and the like, if necessary. Examples of the binder include polyvinylidene fluoride (PVdF), vinyl halide resins such as a copolymer of polyvinylidene fluoride and hexafluoropropylene (PVdF-HFP), butadiene rubber (SBR), acrylate-butadiene rubber (ABR), and styrene. Examples of rubbers include -butadiene rubber (SBR) and acrylonitrile-butadiene rubber (NBR). As the method for forming the solid electrolyte layer and the like, conventionally known methods can be adopted, and the techniques disclosed herein are not limited, so detailed description thereof will be omitted.

(4) Positive electrode The positive electrode 20 includes a positive electrode current collector 22 and a positive electrode active material layer 24 formed on the surface of the positive electrode current collector 22. As the positive electrode current collector 22, a metal sheet having good conductivity can be preferably used, and for example, a metal foil such as aluminum (Al) or an iron alloy (for example, various SUS steels) is suitable. Further, since a metal foil such as an iron alloy (for example, various SUS steels) can generate an electron conductive substance by reacting with a sulfur (S) component of a sulfide-based solid electrolyte, the technique disclosed herein. Is suitable as an object to which.

The positive electrode active material layer 20 contains a positive electrode active material and may further contain a solid electrolyte. The positive electrode active material is a material capable of reversibly occluding and releasing charge carriers. As the positive electrode active material, for example, a metal oxide containing one or more kinds of metal elements and an oxygen element can be preferably used. The metal oxide may be a compound containing a lithium element, one or more kinds of transition metal elements, and an oxygen element. As a preferred example of the metal oxide, lithium transition such as lithium nickel-containing composite oxide, lithium cobalt-containing composite oxide, lithium nickel cobalt-containing composite oxide, lithium manganese-containing composite oxide, and lithium nickel cobalt manganese-containing composite oxide. Examples include metal composite oxides. Further, as the solid electrolyte, for example, the sulfide-based solid electrolyte as described above can be preferably used. In addition to the above components, the positive electrode active material layer 20 may contain other components, such as a binder, a conductive material, and various additives, if necessary. As the binder, it can be appropriately selected and used from those exemplified as those that can be contained in the solid electrolyte layer 30. Further, as the conductive material, for example, acetylene black, ketjen black, carbon fiber and the like can be preferably used. As the method for producing the positive electrode, a conventionally known method can be adopted, and the technique disclosed here is not limited, so detailed description thereof will be omitted.

(5) Negative electrode The negative electrode 40 includes a negative electrode current collector 42 and a negative electrode active material layer 44 formed on the surface of the negative electrode current collector 42. As the negative electrode current collector 42, a metal sheet having good electron conductivity can be preferably used, for example, copper (Cu), nickel (Ni), titanium (Ti), iron (Fe), and these. Metal foils such as alloys of and other elements (eg, SUS steel), aluminum (Al), etc. are suitable. Further, metal foils such as copper (Cu), nickel (Ni), titanium (Ti), iron (Fe), and alloys of these with other elements (for example, SUS steel) are made of sulfur (sulfur), which is a sulfide-based solid electrolyte. S) Since an electron conductive substance can be produced by reacting with a component, it is suitable as an object to which the technique disclosed herein is applied.

The negative electrode active material layer 44 contains a negative electrode active material, and may further contain a solid electrolyte. The negative electrode active material is a material capable of reversibly occluding and releasing charge carriers. Examples of the negative electrode active material include carbon materials such as hard carbon, graphite, and boron-added carbon, metal materials such as Al, Si, Ti, In, and Sn, metal compounds containing the above metal elements, metal oxides, and Li metals. Compounds, Li metal oxides and the like can be preferably used. Further, as the solid electrolyte, for example, the sulfide-based solid electrolyte as described above can be preferably used. In addition to the above components, the negative electrode active material layer 44 may contain other components, such as a binder, a conductive material, and various additives, if necessary. As the binder, it can be appropriately selected and used from those exemplified as those that can be contained in the solid electrolyte layer 30. Further, as the conductive material, it can be appropriately selected and used from those exemplified as those which can be contained in the positive electrode 20. As the method for manufacturing the negative electrode, a conventionally known method can be adopted, and the technique disclosed here is not limited, so detailed description thereof will be omitted.

(6) Battery case The power generation element (that is, the laminated electrode body 10) configured as described above is housed in a battery case (not shown) and sealed, so that a solid electrolyte due to unintended water content, oxidation, etc. Decomposition / deterioration of the material is suppressed. The form of the battery case is not limited, and may be either a square type (rectangular parallelepiped type) or a laminated pack type, and the material thereof is metal, reinforced plastic, a laminated sheet of metal foil and a resin sheet, or the like. good. Although not particularly limited, the battery case may be provided with, for example, a positive electrode external connection terminal and a negative electrode external connection terminal that communicate the inside and the outside of the battery case, and each of these positive and negative external connection terminals is a positive electrode current collector 22. And can be electrically connected to the negative electrode current collector 42. As a result, electric power can be taken out from the power generation element to the external load.

(Other embodiments)
The embodiment of the technique disclosed here has been described above. It should be noted that the above-described embodiment shows an example to which the technique disclosed here is applied, and does not limit the technique disclosed here.

For example, in the above-described embodiment, the terminal laminated body 50 is formed in the negative electrode current collector stretched portion 60, but the terminal laminated body may be formed in the stretched portion of the positive electrode current collector 22 without particular limitation. ..

Further, in the above-described embodiment, the positive electrode active material layer 24, the solid electrolyte layer 30, and the negative electrode active material layer 44 face each other in the main laminated portion 80 (see FIG. 2). As shown, the solid electrolyte layer 30 and the negative electrode active material layer 44 may project outward from the end of the portion facing the positive electrode active material layer 24.

Hereinafter, examples relating to the techniques disclosed herein will be described, but the techniques disclosed herein are not intended to be limited to those shown in such examples.

<Manufacturing of all-solid-state batteries for testing>
A total of 14 types of test all-solid-state batteries, Samples 1 to 14, were manufactured by the process described below. Here, the laminated electrode body included in the test all-solid-state battery of the samples 1, 3, 5, 7, 9, 11, and 13 is a laminated electrode body having a plurality of structures shown in FIG. Further, the laminated electrode body included in the test all-solid-state battery of Samples 2, 4, 6, 8, 10 and 12 has a plurality of structures shown in FIG. 4 laminated. The laminated electrode body included in the test all-solid-state battery of the sample 14 is a laminated electrode body having a plurality of structures shown in FIG. Hereinafter, the production of the laminated electrode body included in the test all-solid-state battery of each sample will be described with reference to FIGS. 2, 4, and 5. Note that 122, 124, 130, 142, 144, 170 in FIG. 4 correspond to 22, 24, 30, 42, 44, 70 in FIG. 2, respectively. Further, 222,224,230,242,244,260,270 in FIG. 5 correspond to 22,24,30,42,44,60,70 in FIG. 2, respectively.

[Sample 1]
(Preparation of positive electrode slurry)
_{Lithium cobalt oxide (LiCoO 2} ) as the positive electrode active material _{and Li 2} SP ₂ S ₅ (mass ratio; Li ₂ S: P ₂ S ₅ = 70: 30) as the sulfide-based solid electrolyte have a weight ratio of 70:30. The positive electrode active material was weighed so that the sulfide-based solid electrolyte = 75:25. Then, 4 parts by weight of the PVdF-based binder and 6 parts by weight of the conductive material (acetylene black) were weighed with respect to 100 parts by weight of the positive electrode active material. These were mixed with butyl butyrate so as to have a solid content of 70% by weight, and kneaded with a stirrer to obtain a composition (positive electrode slurry) for forming a positive electrode active material layer.

(Preparation of negative electrode slurry)
Carbon as the negative electrode active material and Li ₂ SP ₂ S ₅ (mass ratio; Li ₂ S: P ₂ S ₅ = 70: 30) as the sulfide-based solid electrolyte, and the weight ratio is the negative electrode active material: sulfide. Weighed so that the system solid electrolyte = 55:45. Then, 6 parts by weight of the PVdF-based binder and 6 parts by weight of the conductive material (acetylene black) were weighed with respect to 100 parts by weight of the negative electrode active material. These were mixed with butyl butyrate so as to have a solid content of 70% by weight, and kneaded with a stirrer to obtain a composition (negative electrode slurry) for forming a negative electrode active material layer.

(Preparation of solid electrolyte slurry)
98 parts by weight of a sulfide-based solid electrolyte and 2 parts by weight of an SBR-based binder similar to those used for the positive and negative electrode slurry were weighed. These are blended in a heptane solvent so as to have a solid content of 70% by weight, and ultrasonically dispersed for 2 minutes using an ultrasonic disperser to obtain a composition (solid electrolyte slurry) for forming a solid electrolyte layer. Obtained.

(Manufacturing of laminated electrode body)
The positive electrode slurry was applied to one side of the Al foil (positive electrode current collector 22) and dried to form the positive electrode active material layer 24. Next, the negative electrode slurry is applied to one side of the Cu foil (negative electrode current collector 42) whose end is confirmed to have burrs 70 by an electron microscope and on a portion excluding the negative electrode current collector stretched portion 60. By working and drying, the negative electrode active material layer 44 was formed. Subsequently, the solid electrolyte slurry was applied to the negative electrode active material layer 44 and dried to form the solid electrolyte layer 30. Then, the main laminated portion 80 was produced by laminating the solid electrolyte layer 30 so as to be arranged between the positive electrode active material layer 24 and the negative electrode active material layer 44.
Next, the negative electrode current collector layer 44 was formed by applying and drying the negative electrode slurry while leaving the negative electrode current collector exposed portion 62 at the end of the negative electrode current collector extending portion 60. Subsequently, the solid electrolyte slurry was applied onto the negative electrode active material layer and dried to form the solid electrolyte layer 30. In this way, the terminal laminated portion 50 was produced at the end of the negative electrode current collector extending portion 60.
Then, 60 such laminated bodies were produced, and the negative electrode current collectors 42 (or the positive electrode current collectors 22) were laminated and stacked to obtain a laminated electrode body.

(Making a test all-solid-state battery)
The laminated electrode body produced as described above was sealed in a housing made of an aluminum laminated film to which positive and negative terminal terminals were previously attached to obtain a test all-solid-state battery of Sample 1.

[Sample 2]
The test all-solid-state battery of sample 2 was produced by the same materials and processes as in sample 1 except that the negative electrode current collector 142 did not form an exposed portion of the negative electrode current collector.

[Samples 3, 5, 7, 9, 11, 13]
The test all-solid-state batteries of Samples 3, 5, 7, 9, and 11 were prepared by the same materials and processes as those of Sample 1, except that the types of the negative electrode current collectors were changed as shown in Table 1. The sample 13 is made by the same material and process as the sample 1, and is made for a vibration test described later.

[Samples 4, 6, 8, 10, 12]
The test all-solid-state batteries of Samples 4, 6, 8, 10, and 12 were prepared by the same materials and processes as in Sample 2, except that the type of the negative electrode current collector was changed as shown in Table 1.

[Sample 14]
A test all-solid-state battery of sample 14 was produced by the same materials and steps as in sample 1 except that the terminal laminated portion was not formed at the end of the negative electrode current collector stretched portion 260.

<Resistance measurement test using samples 1 to 12>
After the first charge and discharge of the all-solid-state batteries of Samples 1 to 12, resistance measurement was performed.
Specifically, the all-solid-state batteries of Samples 1 to 12 were constrained to a fixed size in the stacking direction of the electrode body at 5 MPa, and then charged and discharged for the first time under the following conditions. The charging was 4.2V-CCCV charging and current rate 25A and 2A current cut, and the discharge was CC3.0V cut and current rate 25A. Then, after charging 90% of the discharge capacity obtained at the first time, the resistance of the all-solid-state battery in the open circuit was measured using a digital multimeter.
Subsequently, the all-solid-state batteries of Samples 1 to 12 were charged at a current value of 1 C until the SOC reached 90%, and then stored at 120 ° C. for 30 days. Then, the resistance in the open circuit of the all-solid-state battery stored for 30 days was measured using a digital multimeter.
The resistance values before and after storage are shown in the corresponding columns of Table 1. Further, the symbols described in <Judgment> in Table 1 indicate that the value of the resistance value after storage was as follows as compared with the resistance value before storage.
X: The resistance value after storage is less than 80% of the resistance value before storage.
〇: The resistance value after storage is 80% or more of the resistance value before storage.

<Vibration test using samples 13 and 14>
The test all-solid-state batteries of samples 13 and 14 are charged to 4.1 V under the same conditions as the above initial charge, and the vibration tester is used for 15 minutes at 7 Hz, 200 Hz, and 7 Hz, respectively, 12 times in 3 directions (up / down / left / right /). After applying vibration (before and after), the current value was measured. The voltage values before and after this test are shown in the corresponding columns of Table 2. Further, the symbols described in <Judgment> in Table 2 indicate that the voltage values after the vibration test were as follows.
X: The voltage value after the vibration test is less than 90% of the voltage value before the vibration test.
〇: The voltage value after the vibration test is 90% or more of the voltage value before the vibration test.

As is clear from the results shown in Table 1, among the samples having a negative electrode current collector other than the Al foil, the samples 3, 5, 7, 9, 11 having the laminated electrode body having the structure as shown in FIG. 2 Then, the change in the resistance value before and after storage is small as compared with the samples 4, 6, 8, 10 and 12 provided with the laminated electrode body having the structure as shown in FIG. 4 (here, the resistance value after storage is small). , It is within the range of ± 20% of the resistance value before storage). Although not particularly limited, the reaction between the negative electrode current collector other than Al (here, Cu, Ni, Ti, Fe, SUS) and the sulfur (S) component of the sulfide-based solid electrolyte causes electrons. A conductive substance is generated, and the electron conductive substance diffuses from the apex of the burr of the negative electrode current collector. In Samples 3, 5, 7, 9, and 11, even if the electron conductive substance diffuses from the burr, it does not reach the positive electrode current collector, so that a short circuit is suppressed. On the other hand, in samples 4, 6, 8, 10, and 12, it can be considered that a short circuit occurs because the electron conductive substance diffuses from the burr and reaches the positive electrode current collector.

Further, as is clear from the results shown in Table 2, the sample 13 having the laminated electrode body having the structure as shown in FIG. 2 is the sample 14 having the laminated electrode body having the structure as shown in FIG. In comparison, it was confirmed that the voltage drop before and after the vibration test was small (here, the voltage value after the vibration test was 90% or more of the voltage value before the vibration test). Although not particularly limited, in sample 14, a short circuit occurs because the burr of the negative electrode current collector and the positive electrode current collector are likely to come into contact with each other, but in sample 13, the ends are laminated so as to cover the burr. Since the portion is formed, it can be considered that such a short circuit is unlikely to occur.

The present invention has been described in detail above, but the above description is merely an example. That is, the techniques disclosed herein include various modifications and changes of the above-mentioned specific examples.

1 All-solid-state battery 10 Laminated electrode body 20 Positive electrode 22 Positive electrode current collector 24 Positive electrode active material layer 30 Solid electrolyte layer 40 Negative electrode 42 Negative electrode current collector 44 Negative electrode active material layer 50 End laminated part 60 Negative electrode current collector extension part 62 Negative electrode collection Electric body exposed part 70 Bali 80 Main laminated part 122 Positive electrode current collector 124 Positive electrode active material layer 130 Solid electrolyte layer 142 Negative electrode current collector 144 Negative electrode active material layer 170 Bali 222 Positive electrode current collector 224 Positive electrode active material layer 230 Solid electrolyte layer 242 Negative electrode current collector 244 Negative electrode active material layer 260 Negative electrode current collector Exposed part 270 Bali

Claims (1)

A positive electrode including a positive electrode current collector and a positive electrode active material layer formed on the positive electrode current collector,
The negative electrode including the negative electrode current collector and the negative electrode active material layer formed on the negative electrode current collector
An all-solid-state battery having a laminated electrode body laminated via a solid electrolyte layer.
Includes sulfide-based solid electrolyte as solid electrolyte,
The laminated electrode body is
A main laminated portion in which the positive electrode active material layer and the negative electrode active material layer are laminated via the solid electrolyte layer, and
A current collector stretched portion extending from either the positive or negative electrode extending from the main laminated portion,
A laminated portion formed at the end of the current collector stretched portion, the end laminated portion formed by providing an exposed current collector exposed portion between the main laminated portion and the current collector stretched portion. When,
Equipped with
Here, the terminal laminated portion is formed by laminating an active material layer having the same electrode as the current collector stretched portion and a solid electrolyte layer in this order, and the active material layer on the counter electrode side and the collection on the counter electrode side. An all-solid-state battery characterized by not containing an electric body.

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