JP5636965B2 - Method for producing electrode body for lithium ion secondary battery and method for producing lithium ion secondary battery - Google Patents

Description

  The present invention relates to a current collector, a method for producing an electrode body comprising a positive electrode layer or a negative electrode layer laminated on the current collector, and a current collector, a positive electrode layer, an electrolyte layer, a negative electrode layer, and a current collector. The present invention relates to a method of manufacturing a battery provided in this order.

  A lithium ion secondary battery has the characteristics that it has higher energy density than other secondary batteries and can operate at a high voltage. For this reason, it is used as a secondary battery that can be easily reduced in size and weight in information equipment such as a mobile phone, and in recent years, there is an increasing demand for large motive power such as for electric vehicles and hybrid vehicles.

  A lithium ion secondary battery includes a positive electrode layer and a negative electrode layer, and an electrolyte layer disposed therebetween. As the electrolyte provided in the electrolyte layer, for example, a non-aqueous liquid or solid is used. When a liquid (hereinafter referred to as “electrolytic solution”) is used as the electrolyte, the electrolytic solution easily penetrates into the positive electrode layer and the negative electrode layer. Therefore, an interface between the active material contained in the positive electrode layer or the negative electrode layer and the electrolytic solution is easily formed, and the performance is easily improved. However, since the widely used electrolyte is flammable, it is necessary to mount a system for ensuring safety. On the other hand, since the solid electrolyte (hereinafter referred to as “solid electrolyte”) is nonflammable, the above system can be simplified. Therefore, a lithium ion secondary battery (hereinafter referred to as “solid battery”) in a form provided with a layer containing a solid electrolyte that is nonflammable (hereinafter referred to as “solid electrolyte layer”) has been proposed. Yes.

  As a technique relating to such a battery, for example, Patent Document 1 discloses a mixture layer forming step of forming a mixture layer having a positive electrode or a negative electrode active material on a current collector having a metal, There is disclosed a method for producing a battery electrode, comprising: a coating layer forming step for forming a coating layer on the substrate; and a pressing step for pressing the mixture layer together with the coating layer.

  Further, in Patent Document 2, a positive electrode active material layer is formed on the surface of a strip-shaped positive electrode current collector foil, folded by one or two or more twists, and a positive electrode terminal is connected to one side edge. A negative electrode active material layer is formed on the surface of the positive electrode sheet and a negative electrode current collector foil having an area corresponding to the folded area of the positive electrode sheet, and is sandwiched between the folded positive electrode sheet via a polymer electrolyte layer. And in a lithium ion polymer secondary battery comprising a negative electrode sheet having a negative electrode terminal connected to one side edge, the polymer electrolyte layer includes a negative electrode side first electrolyte layer formed on a surface of the negative electrode sheet, and A lithium ion polymer secondary battery comprising: a negative electrode side second electrolyte layer formed on the end surface of the other side edge of the negative electrode sheet, which is connected to the negative electrode side first electrolyte layer. Disclosed That.

  Further, Patent Document 3 discloses a bipolar type in which at least two or more bipolar electrodes each having a positive electrode formed on one surface of a current collector and a negative electrode formed on the other surface are stacked in series with an electrolyte layer interposed therebetween. In a bipolar secondary battery module in which a secondary battery element is sealed in an exterior material, a member having a higher tensile stress than the exterior material is inserted between the bipolar secondary battery element and the exterior material. A bipolar secondary battery module is disclosed.

JP 2005-276444 A JP 2004-207118 A JP 2008-140633 A

  In Patent Document 1, a mixture layer having a positive electrode or negative electrode active material is formed on a current collector, a coating layer is formed on the mixture layer, and the mixture layer is laminated in the stacking direction together with the coating layer. The manufacturing method of the electrode for batteries provided with the process pressed to is disclosed. According to the invention described in Patent Document 1, the porosity of the mixture layer can be reduced by going through this process. However, when the laminate including the current collector and the mixture layer is pressed in the lamination direction as described above, there is a problem that the mixture layer (positive electrode layer or negative electrode layer) is peeled off from the current collector after unloading. there were. This is considered to be due to the reason explained below. That is, when the mixture layer is pressurized in the stacking direction as described above, the current collector and the mixture layer extend in the plane direction perpendicular to the stacking direction. At this time, because the elongation rate of the current collector and the mixture layer is different, a stress in a plane direction perpendicular to the stacking direction is generated between the current collector and the mixture layer. The mixture layer (positive electrode layer or negative electrode layer) is easily peeled off from the current collector.

  In the invention described in Patent Document 2, the above problem is not taken into consideration, and even the invention described in Patent Document 2 cannot solve the above problem. Patent Document 3 describes that the internal pressure inside the exterior material containing the current collector, the laminate having the positive electrode layer and the negative electrode layer is lowered, and the members in the exterior material are pressurized (0067 paragraph etc.). ). By adopting such a configuration, it is considered that the positive electrode layer or the negative electrode layer can be prevented from being peeled off from the current collector when the battery is used. However, since there is a possibility that the positive electrode layer or the negative electrode layer may be peeled off from the current collector in the manufacturing process, the invention described in Patent Document 3 is not considered. It could not be solved.

  Then, this invention makes it a subject to provide the manufacturing method of the electrode body in which peeling with the positive electrode layer or negative electrode layer laminated | stacked on this collector and this collector is prevented, and the manufacturing method of a battery.

In order to solve the above problems, the present invention has the following configuration. That is,
1st aspect of this invention is a manufacturing method of the electrode body for lithium ion secondary batteries provided with a collector and the positive electrode layer or negative electrode layer laminated | stacked on this collector, A lamination process for producing a laminate comprising a positive electrode layer or a negative electrode layer laminated on a current collector, a pressurizing process for pressurizing the laminate produced in the lamination process at a pressure of 50 MPa or more and 800 MPa or less in the lamination direction, A constraining step of constraining the laminate while being pressed in the laminating direction at a pressure of 10 MPa or more and 30 MPa or less for 0.1 hour or more and 10 hours or less after the pressing step, and an electrode for a lithium ion secondary battery It is a manufacturing method of a body.

  Hereinafter, when there is no need to distinguish between the current collector in contact with the positive electrode layer and the current collector in contact with the negative electrode layer, these current collectors may be simply referred to as “current collectors” and are distinguished from each other. If necessary, the current collector in contact with the positive electrode layer may be referred to as “positive electrode current collector”, and the current collector in contact with the negative electrode layer may be referred to as “negative electrode current collector”. In addition, when there is no need to distinguish between the positive electrode layer and the negative electrode layer, “electrode layer” may be used to indicate either of them.

  In the constraining step of the electrode body manufacturing method according to the first aspect of the present invention, it is more preferable to constrain the stacked body in the stacking direction for 0.5 hour or more and 5 hours or less.

  In the constraining step of the electrode body manufacturing method according to the first aspect of the present invention, it is more preferable to constrain the stacked body in the stacking direction for 1 hour to 3 hours.

  Moreover, the manufacturing method of the electrode body according to the first aspect of the present invention includes a current collector including a metal foil and a negative electrode layer including a carbon-based negative electrode mixture laminated on the current collector in the stacking step. It is suitable when producing the laminated body provided with these.

A second aspect of the present invention is a method for producing a lithium ion secondary battery comprising a positive electrode current collector, a positive electrode layer, an electrolyte layer, a negative electrode layer, and a negative electrode current collector in this order. A stacking step of preparing a laminate including an electric current body, a positive electrode layer, an electrolyte layer, a negative electrode layer, and a negative electrode current collector in this order; and a laminate manufactured in the stacking step at a pressure of 50 MPa or more and 800 MPa or less in the stacking direction. A pressurizing step of pressurizing, and a constraining step of constraining the laminate while being pressed in the stacking direction at a pressure of 10 MPa or more and 30 MPa or less for 0.1 hour or more and 10 hours or less after the pressurization step. And a method of manufacturing a lithium ion secondary battery.

  According to the first aspect of the present invention, a laminate including a current collector and a positive electrode layer or a negative electrode layer laminated on the current collector is pressurized in a laminating direction at a predetermined pressure for a predetermined time. By constraining the electrode body, it is possible to provide a method for producing an electrode body in which peeling of the current collector and the positive electrode layer or negative electrode layer laminated on the current collector is prevented even after gradual loading.

  According to the second aspect of the present invention, a laminate comprising a positive electrode current collector, a positive electrode layer, an electrolyte layer, a negative electrode layer, and a negative electrode current collector in that order is laminated at a predetermined pressure for a predetermined time. By pressing and restraining in the direction, it is possible to provide a method for manufacturing a battery in which peeling of the current collector and the positive electrode layer or the negative electrode layer laminated on the current collector is prevented even after unloading.

It is a flowchart which shows the process included in the manufacturing method of the electrode body of this invention. It is sectional drawing which shows the process roughly about an example of the manufacturing method of the electrode body of this invention. It is sectional drawing which shows the process roughly about the other example of the manufacturing method of the electrode body of this invention. It is sectional drawing which shows the process roughly about the manufacturing method of the conventional battery.

  The present invention will be described below with reference to the drawings.

  First, after explaining the problem of the conventional battery manufacturing method, the electrode body manufacturing method of the present invention will be described.

  FIG. 4 is a cross-sectional view schematically showing the process of a conventional battery manufacturing method. In the conventional battery manufacturing method, first, as shown in FIG. 4A, a laminate 10a including a positive electrode current collector 1, a positive electrode layer 2, an electrolyte layer 3, a negative electrode layer 4, and a negative electrode current collector 5 is produced. Was. As a manufacturing method of the stacked body 10a, for example, the following method is available. First, the composition constituting the positive electrode layer 2 is applied on the positive electrode current collector 1 and dried, and the positive electrode layer 2 is laminated on the positive electrode current collector 1. Further, the composition constituting the negative electrode layer 4 is applied on the negative electrode current collector 5 and dried, and the negative electrode layer 4 is laminated on the negative electrode current collector 5. At this point, the positive electrode current collector 1 and the positive electrode layer are bound to such an extent that they can be handled until the next step. Similarly, the negative electrode current collector 5 and the negative electrode layer 4 are bound to the extent that they can be handled until the next step.

  Next, a composition containing a solid electrolyte or the like is applied to each of the positive electrode layer 2 and the negative electrode layer 4 to form part of the electrolyte layer 3 on each of the positive electrode layer 2 and the negative electrode layer 4. A stack in which the positive electrode current collector 1, the positive electrode layer 2, the electrolyte layer 3, the negative electrode layer 4, and the negative electrode current collector 5 are stacked in this order by overlapping the electrolyte layers 3 so as to match each other. The body 10a can be produced.

  After producing the laminated body 10a as described above, as shown in FIG. 4B, by applying pressure P1 to the laminated body 10a in the laminating direction, voids included in the positive electrode layer 2, the negative electrode layer 4 and the like are formed. While reducing, the positive electrode active material contained in the positive electrode layer 2 and the negative electrode active material contained in the negative electrode layer 4 and the interface of a solid electrolyte were increased.

  In the conventional battery manufactured in this way, after unloading the pressure P1, for example, as shown in FIG. 4C, warping occurs with the positive electrode current collector 1 side as a trough, and the negative electrode layer 4 and the negative electrode current collector are There was a possibility of peeling between the electric body 5 and the like. This is considered to have the following two causes. The first cause is as follows. When the stacked body 10a is pressed in the stacking direction, the layers constituting the stacked body 10a extend in the plane direction perpendicular to the stacking direction. At this time, since the elongation rates of the current collector and the electrode layer are different, a stress in a plane direction perpendicular to the stacking direction is generated between the current collector and the electrode layer. Due to this stress, the current collector and the electrode layer are easily peeled off. The second cause is that the binding force between the positive electrode current collector 1 and the positive electrode layer 2 was stronger than the binding force between the negative electrode current collector 5 and the negative electrode layer 4.

  As described above, in the conventional battery manufacturing method, there is a problem that peeling occurs between the current collector and the positive electrode layer or the negative electrode layer laminated on the current collector. Although the method has been described, even in the case where only an electrode body in which a positive electrode layer is formed on a positive electrode current collector or an electrode body in which a negative electrode layer is formed on a negative electrode current collector is produced, When strongly pressurized, there was a risk of peeling in the same manner due to the first cause. However, as described below, according to the method for manufacturing an electrode body of the present invention, the above problem can be solved.

  FIG. 1 is a flowchart showing steps included in the method of manufacturing an electrode body according to the present invention. As shown in FIG. 1, the electrode body manufacturing method of the present invention may be described as a lamination step (hereinafter sometimes referred to as “S11”) and a pressurizing step (hereinafter referred to as “S12”). And a constraining step (hereinafter sometimes referred to as “S13”). By passing through these steps, it is possible to produce an electrode body in which peeling between the current collector and the positive electrode layer or negative electrode layer laminated on the current collector is prevented.

1. First Embodiment FIG. 2 is a cross-sectional view schematically showing the process of an example of the method for producing an electrode body of the present invention. With reference to FIG. 1 and FIG. 2, the manufacturing method of the electrode body of the present invention according to the first embodiment will be described.

<Lamination process (S11)>
S11 is a process for producing a current collector and a laminate including the positive electrode layer or the negative electrode layer laminated on the current collector.

  As described above, separation between the current collector and the positive electrode layer or the negative electrode layer laminated on the current collector occurs because the electrode body in which the positive electrode layer is laminated on the positive electrode current collector, or the negative electrode current collector. This is because the electrode body having the negative electrode layer laminated on the body is strongly pressed in the laminating direction. On the other hand, when a battery is produced, a laminate in which a negative electrode current collector, a negative electrode layer, an electrolyte layer, a positive electrode layer, and a positive electrode current collector are produced may be produced, and then the laminate may be pressed in the lamination direction. Therefore, in FIG. 2, the stacked body in which the positive electrode layer 2 is stacked on the positive electrode current collector 1 or the stacked body in which the negative electrode layer 4 is stacked on the negative electrode current collector 5 is not individually pressurized. 1 shows a method of manufacturing a battery by producing a laminated body 10a including these laminated bodies and an electrolyte layer 3 and then pressing the laminated body 10a in the laminating direction. That is, in FIG. 2, the electrode body in which the positive electrode layer 2 is stacked on the positive electrode current collector 1 and the negative electrode layer 4 on the negative electrode current collector 5 are stacked by the electrode body manufacturing method of the present invention. An example of a method for simultaneously producing electrode bodies is illustrated. 2 includes a positive electrode current collector 1, a positive electrode layer 2, an electrolyte layer 3, a negative electrode layer 4, and a negative electrode current collector 5 in this order, and FIG. 2 shows the present invention. It can be said that the method for producing the battery is exemplified. However, the present invention is not limited to such a form. In the method for producing an electrode body of the present invention, in S11, a stacked body including a current collector and a positive electrode layer or a negative electrode layer stacked on the current collector may be produced. That is, S11 is composed of a laminate composed of a positive electrode current collector and a positive electrode layer laminated on the positive electrode current collector, or a negative electrode current collector and a negative electrode layer laminated on the negative electrode current collector. It may be a step of producing a laminate.

  S11 includes, for example, a step of producing a laminate 10a including the positive electrode current collector 1, the positive electrode layer 2, the electrolyte layer 3, the negative electrode layer 4, and the negative electrode current collector 5, as shown in FIG. can do. As a specific method for producing the stacked body 10a, for example, there are the following methods. First, a positive electrode material containing a positive electrode active material, a solid electrolyte, and a binding binder in the form of a slurry is applied onto the positive electrode current collector 1 and dried to laminate the positive electrode layer 2. In addition, a negative electrode material containing a negative electrode active material, a solid electrolyte, and a binder is made into a slurry and applied onto the negative electrode current collector 5 and dried to laminate the negative electrode layer 4. Thereafter, a composition containing a solid electrolyte and a binder is applied to each of the positive electrode layer 2 and the negative electrode layer 4, and a part of the electrolyte layer 3 is formed on each of the positive electrode layer 2 and the negative electrode layer 4. Are laminated. Thereafter, the positive electrode current collector 1, the positive electrode layer 2, the electrolyte layer 3, the negative electrode layer 4, and the negative electrode current collector 5 were laminated in this order by overlapping the electrolyte layers 3 so as to match each other. The laminated body 10a can be produced.

As the positive electrode active material contained in the positive electrode layer 2, a known positive electrode active material typified by lithium cobaltate can be used as appropriate. As the solid electrolyte contained in the positive electrode layer 2, _Li 3 PO ₄ addition of the oxide-based solid electrolytes such as, _Li 3 PS _{4 and, Li 2 S: P 2 S} 5 = 50: 50~100: 0 become as Li ₂ S and _P 2 _{S 5} sulfide was prepared by mixing a solid electrolyte (e.g., by mass _{ratio, Li 2 S: P 2 S} 5 = 70: 30 to become as Li ₂ S and A known solid electrolyte such as a sulfide solid electrolyte prepared by mixing P ₂ S ₅ can be appropriately used. Furthermore, examples of the binding binder contained in the positive electrode layer 2 include fluorine-containing resins such as polyvinylidene fluoride (PVDF). In addition, the positive electrode layer 2 can contain a known conductive material such as acetylene black. Although the thickness of the positive electrode layer 2 is not specifically limited, For example, it is preferable that they are 0.1 micrometer or more and 1000 micrometers or less.

  For the negative electrode layer 4, a known carbon-based negative electrode mixture containing graphite or the like as a negative electrode active material can be used. However, the negative electrode active material contained in the negative electrode layer 4 is not limited to graphite, and other known negative electrode active materials can be appropriately used. Further, as the solid electrolyte contained in the negative electrode layer 4, the same material as the solid electrolyte that can be used for the positive electrode layer 2 can be used. Furthermore, examples of the binding binder contained in the negative electrode layer 4 include fluorine-containing resins such as polyvinylidene fluoride (PVDF). In addition, the negative electrode layer 4 may contain a known conductive material such as acetylene black. Although the thickness of the negative electrode layer 4 is not specifically limited, For example, it is preferable that they are 0.1 micrometer or more and 1000 micrometers or less.

  The solid electrolyte used for the electrolyte layer 3 is not particularly limited as long as it is a known solid electrolyte that can be used for a battery, and the same material as the solid electrolyte that can be used for the positive electrode layer 2 and the negative electrode layer 4 is used. be able to. The thickness of the electrolyte layer 3 varies greatly depending on the type of electrolyte, the configuration of the battery, and the like. For example, the thickness of the electrolyte layer 3 may be in the range of 0.1 μm to 1000 μm, particularly in the range of 0.1 μm to 300 μm. preferable.

  As the positive electrode current collector 1 or the negative electrode current collector 5, a known current collector that can be used for a battery, such as an Al foil, a Cu foil, a Ni foil, a Fe foil, a CuNi foil, a CuFe foil, or the like is appropriately used. be able to.

<Pressurizing step (S12)>
S12 is a process of pressurizing the laminated body produced in S11 in the laminating direction. The means for pressurizing the laminate in S12 is not particularly limited, and can be pressurized by a known means.

  For example, S12 may be a step of pressurizing the stacked body 10a with the pressure P1 in the stacking direction as illustrated in FIG. By pressing the laminated body 10a in the laminating direction, the voids contained in the positive electrode layer 2, the negative electrode layer 4 and the like are reduced, and the positive electrode active material contained in the positive electrode layer 2 and the negative electrode active material contained in the negative electrode layer 4 (hereinafter referred to as “positive electrode active material”) When there is no need to distinguish between the positive electrode active material and the negative electrode active material, it may be referred to as “active material” to indicate either of them, and the contact area between the solid electrolyte may be increased. it can. In S12, the strength of the pressure P1 is preferably 50 MPa or more and 800 MPa or less, and the pressurization time is preferably 1 second or more and 10 hours or less. When the strength of the pressure P1 is weaker than the lower limit value of the above range or when the pressurizing time is shorter than the lower limit value of the above range, a large amount of voids are left in the positive electrode layer 2 and the negative electrode layer 4 and the active material and the solid electrolyte There is a risk that the contact area with the surface will be reduced. On the other hand, when the strength of the pressure P1 is higher than the upper limit value in the above range or when the pressurization time is shorter than the upper limit value in the above range, the voids contained in the positive electrode layer 2 and the negative electrode layer 4 become too small, and charging / discharging. There is a possibility that the positive electrode layer 2 and the negative electrode layer 4 may break due to expansion and contraction of the active material.

<Restraining step (S13)>
S13 is a step of constraining the laminated body produced in S11 by pressing in the laminating direction after S12.

  For example, as shown in FIG. 2C, S13 can be a step of restraining the laminated body 10a while being pressurized in the laminating direction with the pressure P2 using appropriate restraining means 20 and 20.

  In S12, when a strong pressure is applied in the stacking direction of the stacked body 10a, each layer constituting the stacked body 10a is stretched in a plane direction perpendicular to the stacking direction as shown in FIG. At this time, as described above, stress is generated between the positive electrode current collector 1 and the positive electrode layer 2 and between the negative electrode current collector 5 and the negative electrode layer 4. However, in S13, between the positive electrode current collector 1 and the positive electrode layer 2 by restraining the stacked body 10a while being pressurized in the stacking direction for a predetermined time at a pressure P2 of 0.1 MPa or more and 100 MPa or less. And the stress which generate | occur | produced between the negative electrode collector 5 and the negative electrode layer 4 can be relieved. Therefore, peeling between the positive electrode current collector 1 and the positive electrode layer 2 and between the negative electrode current collector 5 and the negative electrode layer 4 can be prevented.

  In S13, the strength of the pressure for pressurizing the laminate is preferably 1 MPa or more and 50 MPa or less, and more preferably 10 MPa or more and 30 MPa or less. In S12, the time during which the laminate is pressed is preferably from 0.1 hours to 10 hours, more preferably from 0.5 hours to 5 hours, and more preferably from 1 hour to 3 hours. More preferably. If the pressure for pressurizing the laminate is less than 1 MPa, the adhesive force between the electrode layer and the current collector is insufficient, and peeling between the electrode layer and the current collector may not be prevented. On the other hand, if the pressure to pressurize the laminated body exceeds 50 MPa, the pressure between the current collector and the electrode layer is always applied while the stress is generated between the current collector and the electrode layer in S13. There is a risk that this will not be sufficiently relaxed. Further, if the time for pressurizing the laminate is shorter than 0.1 hour, there is a possibility that the stress between the current collector and the electrode layer is not sufficiently relaxed. On the other hand, when the time for pressurizing the laminate is longer than 10 hours, the positive electrode layer and the negative electrode layer are cured, and the positive electrode layer and the negative electrode layer may break due to expansion and contraction of the active material during charge and discharge.

2. Second Embodiment With reference to FIGS. 1 and 3, a method for manufacturing an electrode body according to a second embodiment of the present invention will be described. FIG. 3 is a cross-sectional view schematically showing the process of another example of the electrode body manufacturing method of the present invention.

  The method shown in FIG. 3 is the same as that of the first embodiment except for S12. That is, since the process of producing the laminated body 10a as shown in FIG. 3A is the same as S11 of the first embodiment, description thereof is omitted.

  In the method shown in FIG. 3, S12 is performed by CIP (Cold Isostatic Press). More specifically, as shown in FIG. 3B, the laminated body 10a is enclosed in an exterior material 30, and the outside is further covered with a coating material 31, and CIP is performed. As the exterior material 30, a known exterior material used for a conventional battery can be appropriately used. For example, an aluminum exterior material can be used. Moreover, the coating | covering material 31 is used in order to prevent the laminated body 10a from getting wet with a pressure medium (water etc.), when performing CIP. As the covering material 31, a conventionally used material can be used without any particular limitation. The pressure applied to the laminated body 10a by CIP can select arbitrary values in the range of 50 MPa or more and 800 MPa or less. The pressure can be set to, for example, about 196 MPa. Moreover, the time to pressurize can set arbitrary time in the range of 1 second or more and 10 hours or less. By performing CIP, the laminated body 10a can be isotropically pressurized.

  In the present invention, as a method of pressurizing the laminated body 10a in S12, a method using a roll press or a plane press may be employed. At this time, the covering material 31 is unnecessary, and the strength and time for pressurizing the laminated body 10a can be the same as the CIP.

  Thus, by pressing the laminate 10a with CIP or the like, the voids contained in the positive electrode layer 2 and the negative electrode layer 4 are reduced, and the positive electrode active material contained in the positive electrode layer 2 and the negative electrode active material contained in the negative electrode layer 4 are reduced. The contact area between the substance and the solid electrolyte can be increased.

  In addition, when the CIP is performed as described above, since pressure is applied in the stacking direction of the stacked body 10a, each layer constituting the stacked body 10a is stretched in a plane direction perpendicular to the stacking direction. At this time, as described above, stress is generated between the positive electrode current collector 1 and the positive electrode layer 2 and between the negative electrode current collector 5 and the negative electrode layer 4. Therefore, after performing CIP, as shown in FIG.3 (c), the coating | covering material 31 is removed and the laminated body 10a enclosed with the exterior material 30 is pressurized like S13 of said 1st embodiment. Restrained. By passing through this process, peeling between the positive electrode current collector 1 and the positive electrode layer 2 and between the negative electrode current collector 5 and the negative electrode layer 4 can be prevented.

  The present invention has been described with reference to the most practical and preferred embodiments at the present time. However, the present invention is not limited to the embodiments disclosed in the present specification, and can be appropriately changed within the scope of the claims and the gist or idea of the invention that can be read from the entire specification. It should be understood that the manufacturing method of the electrode body and the manufacturing method of the battery with such a change are also included in the technical scope of the present invention.

  The electrode body manufacturing method of the present invention can be applied to manufacture of an electrode body provided in a battery used as a power source for portable devices, electric vehicles, hybrid vehicles, and the like.

DESCRIPTION OF SYMBOLS 1 Positive electrode collector 2 Positive electrode layer 3 Electrolyte layer 4 Negative electrode layer 5 Negative electrode collector 10a Laminated body 20 Constraining means 30 Exterior material 31 Covering material

Claims (7)

A method for producing an electrode body for a lithium ion secondary battery comprising a current collector and a positive electrode layer or a negative electrode layer laminated on the current collector,
A stacking step of manufacturing a stack including the current collector and the positive electrode layer or the negative electrode layer stacked on the current collector;
A pressurizing step of pressurizing the laminate produced in the laminating step with a pressure of 50 MPa or more and 800 MPa or less in the laminating direction;
After the pressurizing step, a constraining step of restraining the laminated body while being pressed in the laminating direction at a pressure of 10 MPa or more and 30 MPa or less for 0.1 hour or more and 10 hours or less ;
The manufacturing method of the electrode body for lithium ion secondary batteries containing this. 2. The method of manufacturing an electrode body for a lithium ion secondary battery according to claim 1, wherein, in the restraining step, the laminate is restrained in the stacking direction for 0.5 hours or more and 5 hours or less. 2. The method for producing an electrode body for a lithium ion secondary battery according to claim 1, wherein in the restraining step, the laminate is restrained in the stacking direction for 1 hour or more and 3 hours or less. In the laminating step, the current collector comprising a metal foil, and said population stacked on the collector, said to produce a laminate comprising the negative electrode layer containing a carbon-based negative electrode admixture of claim 1-3 The manufacturing method of the electrode body for lithium ion secondary batteries in any one. A method for producing a lithium ion secondary battery comprising a positive electrode current collector, a positive electrode layer, an electrolyte layer, a negative electrode layer, and a negative electrode current collector in the order,
A laminating step of producing a laminate including the positive electrode current collector, the positive electrode layer, the electrolyte layer, the negative electrode layer, and the negative electrode current collector in the order;
A pressurizing step of pressurizing the laminate produced in the laminating step with a pressure of 50 MPa or more and 800 MPa or less in the laminating direction;
After the pressurizing step, a constraining step of restraining the laminated body while being pressed in the laminating direction at a pressure of 10 MPa or more and 30 MPa or less for 0.1 hour or more and 10 hours or less ;
A method for producing a lithium ion secondary battery, comprising : The manufacturing method of the electrode body for lithium ion secondary batteries in any one of Claims 1-4 in which the said positive electrode layer and the said negative electrode layer contain a solid electrolyte. The method for producing a lithium ion secondary battery according to claim 5, wherein the positive electrode layer and the negative electrode layer contain a solid electrolyte.

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