JP2008016580A - Active material for accumulator device and manufacturing method therefor, electrode for the accumulator device and manufacturing method thereof, and the accumulator device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an accumulator device that has low internal resistance for an active material layer itself and improved electrical connection between the active material layer and a collector, and has high output characteristics. <P>SOLUTION: An active material formation material 1, containing at least an electrode active material and a binder, is supplied between a lower die 2 and an upper die 3 where irregular patterns 4, 5 mutually formed are arranged opposite, and is pressed with the lower and upper dies to separate the lower and upper dies, thus manufacturing the active material 6 for accumulator devices where irregular patterns 9, 8 are formed on both the rear and on the front surfaces of the active material formation material. The collector 7 is stuck to one surface of the active material made of the active material for accumulator devices, and an electrode 10 for accumulator devices is manufactured, and by using the electrode for accumulator devices, an accumulator device, such as an electric double-layer capacitor, is formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electricity storage device such as an electric double layer capacitor. In addition, in such an electricity storage device, the present invention relates to an electrode for an electricity storage device constituting a positive electrode body and a negative electrode body, and a method for producing the electrode for the electricity storage device. The present invention also relates to an active material for an electricity storage device that constitutes an electrode for an electricity storage device, and a method for producing the active material for the electricity storage device.

  2. Description of the Related Art In recent years, the performance of portable electronic devices and hybrid automobiles has been remarkably improved, and the demand for higher performance of power storage devices such as batteries used therefor has increased. In addition to improving the performance of conventional batteries such as primary batteries such as alkaline batteries and oxyride batteries, secondary batteries such as nickel metal hydride batteries and lithium ion batteries, next generation batteries such as fuel cells and next generation batteries such as electric double layer capacitors Development for practical use is also being promoted in new technical fields such as power storage devices.

  In particular, electric double layer capacitors are attracting attention, with a long cycle life, high current output, rapid charge / discharge, a wide temperature range, miniaturization, thickness reduction, and weight reduction. Since it has many advantages such as being possible, safe for the human body, and environmentally friendly, it has been actively developed as an electricity storage device to replace batteries.

  Although the means for generating electric energy is different, the basic configuration of the conventional battery and the electric double layer capacitor is not changed. In other words, it is composed of two pairs of electrodes for an electricity storage device consisting of a current collector and an active material layer formed on the surface of the current collector, a separator inserted between the two pairs of electricity storage devices, and an electrolyte. Yes. Whereas a conventional battery generates electric energy by an electrochemical reaction in an active material, an electric double layer capacitor generates electric energy by an electric double layer generated in the active material layer.

  Today, various approaches have been taken to improve the performance of electrical storage devices with the aim of improving the efficiency of electrical energy generation and reducing internal energy, in terms of material improvements and configuration improvements. Yes.

  In the electric double layer capacitor, for example, as described in Patent Document 1 below, the activated carbon-based kneaded material is integrated on the surface of the metal foil serving as the active material layer, and a minute width groove is formed in the kneaded material layer by stamping or cutting. By holding the electrolyte solution in this groove, the active material layer is efficiently impregnated with the electrolyte solution, and the utilization efficiency of the pores of the activated carbon constituting the active material layer is increased, and the capacitance is increased. The internal resistance can be reduced.

  Alternatively, as described in Patent Document 2 below, a cylindrical roller is pressed on the surface of the active material layer containing at least porous particles and a binder to form an uneven pattern on the surface of the active material layer As a result, the adhesion between the electrode active material and the conductive auxiliary material was increased, and the internal resistance was reduced.

  Furthermore, as described in Patent Document 3 below, the active material layer and the current collector are formed by forming a convex portion having an acute or arc tip with a tip angle of 90 degrees or less on the outer surface of the active material layer. The body contact resistance was reduced and the internal resistance was reduced.

JP 2004-303754 A JP-A-2005-33066 JP 2002-43180 A

  However, in what is described in Patent Document 1 and Patent Document 2 described above, even if there is an effect of reducing the internal resistance of the uneven pattern formed on the surface of the active material layer, the contact between the active material layer and the current collector is not It was ohmic and the internal resistance of the electrode was not sufficiently low. Moreover, in what was described in the said patent document 3, although the electrical connection of an active material layer and a collector was favorable, the internal resistance of the active material layer was not low enough.

  Therefore, a first object of the present invention is to obtain an electricity storage device having a high output characteristic in which the internal resistance of the active material layer itself is low, the electrical connection between the active material layer and the current collector is good. .

  Further, in the methods described in Patent Document 1 and Patent Document 2, an uneven pattern is formed by stamping, cutting, and roller pressing on an active material layer formed into a sheet shape by rolling. The planar shape, cross-sectional shape, and size of the concavo-convex pattern that can be formed are limited, and the concavo-convex pattern cannot be formed with good reproducibility, so that the internal resistance is insufficiently reduced.

  A second object of the present invention is to form an uneven pattern with good reproducibility on both the front and back surfaces of an active material layer to sufficiently reduce internal resistance.

  A third object of the present invention is to facilitate the fixation of the current collector to the active material layer and to simplify the production of the electrode for the electricity storage device.

  A fourth object of the present invention is to obtain an electric double layer capacitor having a high output characteristic in which the internal resistance of the active material layer itself is low, the electrical connection between the active material layer and the current collector is also good. .

  Therefore, in order to achieve the first object, the invention described in claim 1 is an active material for an electricity storage device, and uses an active material forming material containing at least an electrode active material and a binder. An uneven pattern is formed on both sides.

  The invention according to claim 2 is also a method for producing an active material for an electricity storage device, in order to achieve the first object, wherein a lower mold and an upper mold in which concavo-convex patterns formed opposite to each other are arranged. Are provided with an active material forming material containing at least an electrode active material and a binder, and the active material forming material is pressurized by the lower mold and the upper mold, and then the lower mold and the upper mold It is manufactured by peeling off the mold.

  The invention described in claim 3 is also an active material for an electricity storage device, and is manufactured by the manufacturing method described in claim 2 in order to achieve the first object.

  The invention described in claim 4 is also a method for producing an active material for an electricity storage device, in order to achieve the first object, wherein the uneven pattern formed in the lower mold includes at least an electrode active material and a binder. The active material forming material is supplied, and after the upper die is pressed against the active material forming material until the active material forming material enters the uneven pattern formed on the upper die, the upper die and the lower die It is manufactured by peeling off the mold.

  The invention described in claim 5 is also an active material for an electricity storage device, and is manufactured by the manufacturing method described in claim 4, in order to achieve the first object.

  The invention described in claim 6 is a method for producing an electrode for an electricity storage device to achieve the second object, wherein the active material for an electricity storage device according to claim 3 is collected on one side as an active material layer. It is characterized by being manufactured by fixing an electric body.

  The invention according to claim 7 is also a method for producing an electrode for an electricity storage device, in order to achieve the second object, wherein the active material for the electricity storage device according to claim 5 is used as an active material layer on one side thereof. The current collector is manufactured by being fixed.

  The invention according to claim 8 is a method of manufacturing an electrode for an electricity storage device in order to achieve the second and third objects, wherein either the lower mold or the upper mold also serves as a current collector, An active material forming material in which the surface area of the concavo-convex pattern formed on one mold also serving as a current collector is larger than the surface area of the concavo-convex pattern formed on the other mold, and includes at least an electrode active material and a binder Is manufactured by pressing the lower mold and the upper mold and then peeling the other mold.

  The invention according to claim 9 is also a method for manufacturing an electrode for an electricity storage device in order to achieve the second and third objects, and either the lower mold or the upper mold also serves as a current collector, The side surface inclination angle of the concavo-convex pattern formed on one mold that also serves as the current collector is larger than the side surface inclination angle of the concavo-convex pattern formed on the other mold, and includes at least an electrode active material and a binder. The active material forming material is manufactured by pressing the lower mold and the upper mold and then peeling the other mold.

  The invention described in claim 10 is an electrode for an electricity storage device to achieve the second object, and is manufactured by the manufacturing method according to any one of claims 6 to 9. .

  The invention described in claim 11 is an electricity storage device to achieve the first object, characterized in that it is formed using the electrode for an electricity storage device according to claim 10.

  According to a twelfth aspect of the present invention, in order to achieve the fourth object, the electric storage device according to the eleventh aspect is an electric double layer capacitor.

  According to the first aspect of the present invention, since the concave and convex patterns are formed on the front and back surfaces of the active material forming material, the internal resistance of the active material layer itself is low, and the electrical current between the active material layer and the current collector is low. An electrical storage device having good connection and high output characteristics can be obtained.

  According to the invention described in claim 2, the active material forming material is supplied between the lower mold and the upper mold in which the concavo-convex patterns formed to face each other are arranged, and the active material forming material is After being pressed by the upper mold, the lower mold and the upper mold are peeled to produce an active material for an electricity storage device, so that the internal resistance of the active material layer itself is low, and the active material layer and the current collector The electrical connection of the body is also good, and an electricity storage device having high output characteristics can be obtained.

  According to the invention described in claim 3, since the active material for the electricity storage device is manufactured by the manufacturing method described in claim 2, the internal resistance of the active material layer itself is low, and the electric current between the active material layer and the current collector is low. Electrical connection is also good, and an electricity storage device having high output characteristics can be obtained.

  According to the invention of claim 4, the active material forming material is supplied to the uneven pattern formed in the lower mold, and the upper mold is activated until the active material forming material enters the uneven pattern formed in the upper mold. After being pressed against the material forming material, the upper die and the lower die are peeled to produce an active material for an electricity storage device, so that the internal resistance of the active material layer itself is low, and the active material layer and the current collector The electrical connection of the body is also good, and an electricity storage device having high output characteristics can be obtained.

  According to the invention described in claim 5, since it is an active material for an electricity storage device manufactured by the manufacturing method described in claim 4, the internal resistance of the active material layer itself is low, and the active material layer and the current collector An electrical storage device having good electrical connection and high output characteristics can be obtained.

  According to the invention described in claim 6, since the electricity storage device electrode is manufactured by fixing the current collector on one side of the electricity storage device active material according to claim 3 as an active material layer, the active material layer The internal resistance can be sufficiently reduced by forming a concave / convex pattern having a very fine size of μm and sub-μm and having an arbitrary shape on both front and back surfaces with good reproducibility.

  According to the invention described in claim 7, since the power storage device active material according to claim 5 is used as an active material layer and the current collector is fixed to one surface thereof to produce the electrode for the power storage device, the active material layer The internal resistance can be sufficiently reduced by forming a concave / convex pattern having a very fine size of μm and sub-μm and having an arbitrary shape on both front and back surfaces with good reproducibility.

  According to the invention described in claim 8, one of the lower mold and the upper mold also serves as a current collector, and the surface area of the concavo-convex pattern formed on one mold serving also as the current collector is the other mold. Since the surface area of the concavo-convex pattern formed on the surface is made larger, the active material forming material is pressed by the lower mold and the upper mold, and then the other mold is peeled off to produce the electrode for the electricity storage device. The internal resistance can be sufficiently reduced by forming an uneven pattern having a very fine size of μm and sub-μm and having an arbitrary shape on both the front and back surfaces of the active material layer with good reproducibility. In addition, it is possible to leave one mold that also serves as a current collector without being peeled from the active material layer, and to save the trouble of fixing the active material layer to the current collector through an adhesive or the like. It is possible to easily fix the current collector to the material layer and to simplify the production of the electrode for the electricity storage device.

  According to the ninth aspect of the present invention, one of the lower mold and the upper mold also serves as a current collector, and the side surface inclination angle of the concave-convex pattern formed on one mold serving as the current collector is the other. The electrode for the electricity storage device is made larger than the inclination angle of the side surface of the concavo-convex pattern formed on the mold, the active material forming material is pressed by the lower mold and the upper mold, and then the other mold is peeled off. Since it is manufactured, it is possible to form an uneven pattern having a very fine size of μm and sub-μm and having an arbitrary shape on both the front and back surfaces of the active material layer with good reproducibility, thereby sufficiently reducing the internal resistance. In addition, it is possible to leave one mold that also serves as a current collector without being peeled from the active material layer, and to save the trouble of fixing the active material layer to the current collector through an adhesive or the like. It is possible to easily fix the current collector to the material layer and to simplify the production of the electrode for the electricity storage device.

  According to the invention described in claim 10, since it is an electrode for an electricity storage device manufactured by the manufacturing method according to any one of claims 6 to 9, the size is μm on both the front and back surfaces of the active material layer, By forming a concavo-convex pattern that is very fine as sub-μm and has an arbitrary shape with good reproducibility, the internal resistance can be sufficiently reduced.

  According to the eleventh aspect of the invention, since the electric storage device is formed using the electric storage device electrode according to the tenth aspect, the internal resistance of the active material layer itself is low, and the active material layer and the current collector Thus, an electrical storage device having a high output characteristic can be obtained.

  According to the invention of claim 12, since the electricity storage device of claim 11 is an electric double layer capacitor, the internal resistance of the active material layer itself is low, and the active material layer and the current collector are electrically connected. And an electric double layer capacitor having high output characteristics can be obtained.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 4 show a method for manufacturing an electrode for an electricity storage device according to the present invention. In each figure, the scale of each component is not considered in order to make the contents of the invention easy to understand.

  First, in the manufacturing method shown in FIG. 1, a lower mold 2 and an upper mold 3 are prepared as shown in FIG. The lower mold 2 and the upper mold 3 use materials such as metal, ceramics, and glass, and use known mold processing techniques such as a photolithography technique, an X-ray lithography technique, an etching technique, an electroforming technique, and a machining technique. Alternatively, these mold processing techniques are used in combination. In the illustrated example, a nickel-based alloy made by electroforming a Si master mold processed using a photolithography technique and an etching technique is used.

  The lower mold 2 and the upper mold 3 are respectively provided with irregular patterns 4 and 5 having an arbitrary size and an arbitrary shape at arbitrary positions. In this example, the upper surface of the convex portion is 0.5 μm square, the base is 1 μm square, the height is 0.5 μm, and many patterns having tapered side surfaces are formed. And the lower mold | type 2 and the upper mold | type 3 are arrange | positioned so that the uneven | corrugated pattern 4 and 5 formed mutually may be opposed.

  Next, as shown in (B), the active material forming material 1 is supplied between the lower mold 2 and the upper mold 3. The active material forming material 1 only needs to contain at least an electrode active material and a binder, and here, it is composed of an electrode active material, a binder, and a conductive auxiliary material, and the electrode active material is granular activated carbon particles, and the binder is Although carbon black is used as the fluorine-based polymer and the conductive auxiliary material and these materials are kneaded, it is not particularly limited to such materials.

  Then, as shown in (C), the active material forming material 1 is pressed by the lower mold 2 and the upper mold 3 to be dried while being filled in the concavo-convex patterns 4 and 5. As other methods for filling the concavo-convex patterns 4 and 5 with the active material forming material 1, there are other methods such as a coating method by spin coating or spraying, a dipping method, a doctor blade method, a rolling method using a roller or the like. .

  That is, in this example, the lower mold 2 and the upper mold 3 are arranged so that the concave and convex patterns 4 and 5 formed on the lower mold 2 and the upper mold 3 face each other. An active material 1 containing at least an electrode active material and a binder is supplied between the lower die 2 and the upper die 3 by using a pressing mechanism (not shown). Is to be pressurized.

  Thereafter, as shown in (D), when the lower mold 2 and the upper mold 3 are peeled from the active material forming material 1, the concave and convex patterns 9 and 8 having an arbitrary size on the front and back surfaces are formed. The power storage device active material 6 to be formed is manufactured. The surface on which the concave / convex pattern 4 of the lower mold 2 is formed and the surface on which the concave / convex pattern 5 of the upper mold 3 is formed are each subjected to surface treatment so that the active material forming material 1 can be easily peeled off. Good.

  Next, as shown in (E), the power storage device active material 6 is used as the active material layer, and the current collector 7 is fixed to one surface thereof to manufacture the power storage device electrode 10.

  Next, in the manufacturing method shown in FIG. 2, as shown to (A), the lower mold | type 12 and the upper mold | type 13 are prepared. The lower mold 12 and the upper mold 13 are made by using the same material as that used in the method for manufacturing the electricity storage device electrode 10 shown in FIG. In the illustrated example, similarly, a nickel-based alloy manufactured by electroforming a Si master mold processed using a photolithography technique and an etching technique is used.

  Similarly, the lower mold 12 and the upper mold 13 are respectively provided with irregular patterns 14 and 15 having an arbitrary size and an arbitrary shape at an arbitrary position. In this example, the upper surface of the convex portion is 0.5 μm. A large number of patterns having a tapered side surface with a corner having a base of 1 μm square and a height of 0.5 μm are formed. And the lower mold | type 12 and the upper mold | type 13 are arrange | positioned facing the uneven | corrugated patterns 14 and 15 mutually formed.

  Then, as shown in (B), the active material forming material 11 is filled into the concave / convex pattern 14 formed on the lower mold 12 by, for example, a spin coating method. The active material forming material 11 only needs to contain at least an electrode active material and a binder. Here, granular activated carbon particles are used as an electrode active material, a fluorine-based polymer is used as a binder, and carbon black is used as a conductive auxiliary material. Dispersed in solution is used.

  Next, as shown in (C), the upper mold 13 pushes against the active material forming material 11 on the lower mold 12 until the active material forming material 11 enters the concave portion of the concave / convex pattern 15 formed on the upper mold 13. It is dried while being applied.

  Thereafter, as shown in (D), when the lower mold 12 and the upper mold 13 are peeled from the active material forming material 11, the concave and convex patterns 19 and 18 having an arbitrary size on the front and back surfaces are formed. The power storage device active material 16 to be formed is manufactured. In this example, in order to increase the density of the active material 16 for an electricity storage device, a compressive load is applied to the active material forming material 11 when the active material forming material 11 is dried. Also in this case, the surface treatment is performed on the surface on which the concave / convex pattern 14 of the lower mold 12 and the surface on which the concave / convex pattern 15 of the upper mold 13 are formed so that the active material forming material 11 can be easily peeled off. It is good to give.

  Next, as shown in (E), the power storage device active material 16 is used as an active material layer, and the current collector 17 is fixed to one surface thereof to manufacture the power storage device electrode 20.

  Moreover, in the manufacturing method shown in FIG. 3, as shown to (A), the lower mold | type 22 and the upper mold | type 23 are prepared. And although either the lower mold | type 22 and the upper mold | type 23 may be sufficient, either one serves as a collector. In this example, the upper mold 23 also serves as a current collector. Arbitrary patterns 24 and 25 having an arbitrary size and an arbitrary shape are formed at arbitrary positions on the lower mold 22 that also does not function as a current collector and the upper mold 23 that also functions as a current collector.

  In this example, the lower mold 22 that does not serve also as a current collector is formed with a large number of patterns each having a 1 μm square straight from the top surface to the base portion and having a convex portion height of 0.5 μm. On the other hand, the upper mold 23 also serving as a current collector is formed with a large number of patterns having a convex portion periphery of 0.3 μm square and a convex portion height of 0.5 μm. That is, the surface area of the concavo-convex pattern 25 formed on the upper mold 23 also serving as a current collector is larger than the surface area of the concavo-convex pattern 24 formed on the lower mold 22 not serving also as a current collector. And the lower mold | type 22 and the upper mold | type 23 are arrange | positioned facing the uneven | corrugated patterns 24 and 25 which were formed mutually.

  Then, as shown in FIG. 1B, an active material forming material containing at least an electrode active material and a binder is supplied between the lower die 22 and the upper die 23, and as shown in FIG. In addition, the active material forming material is pressed by the lower mold 22 and the upper mold 23, thereby being dried while being filled in the concavo-convex patterns 24 and 25. Alternatively, as shown in FIG. 2B, an active material forming material containing at least an electrode active material and a binder is supplied to the concave / convex pattern 24 formed in the lower mold 22, and as shown in FIG. The upper mold 23 is pressed against the active material forming material on the lower mold 22 until the active material forming material enters the recesses of the concave / convex pattern 25 formed on the upper mold 23. It is dried while being pressed with the upper mold 23.

  Thereafter, as shown in FIG. 3B, the lower mold 22 that does not serve as a current collector is peeled off. At this time, the contact area between the upper mold 23 and the active device for electricity storage device 26 is larger than the contact area between the lower die 22 and the active material for electricity storage device 26. The upper die 23 and the active material 26 for the electricity storage device 26 are stronger than the adhesive force, and the upper die 23 does not peel from the active material 26 for the electricity storage device. The storage device electrode 30 to which the active material layer made of the storage device active material 26 is fixed is manufactured.

  As a result, the upper mold 23 that also serves as a current collector can be left as it is without being peeled off from the active material layer made of the active material 26 for the electricity storage device, and the active material layer can be separately collected via an adhesive or the like. Thus, it is possible to simplify the manufacture of the electrode for the electricity storage device by eliminating the trouble of fixing to the body and facilitating the fixing of the current collector to the active material layer.

  Moreover, in the manufacturing method shown in FIG. 4, as shown to (A), the lower mold | type 32 and the upper mold | type 33 are prepared. And although either the lower mold | type 32 and the upper mold | type 33 may be sufficient, either one serves as a collector. In this example, as in the case of FIG. 3, the upper mold 33 also serves as a current collector. The lower mold 32 not serving as a current collector and the upper mold 33 serving also as a current collector are respectively provided with irregular patterns 34 and 35 having an arbitrary size and an arbitrary shape.

  In this example, as shown in FIG. 5A, the lower mold 32 not serving as a current collector has a top surface of the convex portion 34a of 0.5 μm square, a base portion of 1 μm square, and a height of 0.2 mm. While many patterns having a tapered side surface inclination angle θ of 5 μm are formed, as shown in FIG. 5B, the upper mold 33 that also serves as a current collector has a periphery of the convex portion 35a. A large number of patterns having a 0.3 μm square straight from the top surface to the base, a convex portion height of 0.5 μm, and a side surface inclination angle of 0 are formed. That is, the side surface inclination angle θ of the concavo-convex pattern 35 formed on the upper mold 33 that also serves as a current collector is larger than the side surface inclination angle of the concavo-convex pattern 34 formed on the lower mold 32 that also does not serve as a current collector. Yes. And the lower mold | type 32 and the upper mold | type 33 are arrange | positioned so that the uneven | corrugated patterns 34 and 35 mutually formed may be opposed.

  Then, as in the case of FIG. 3, an active material forming material containing at least an electrode active material and a binder is supplied between the lower mold 32 and the upper mold 33 as shown in FIG. 1B. In the same manner as shown in (C), the active material forming material is pressed by the lower mold 32 and the upper mold 33 to be dried while filling the concave and convex patterns 34 and 35. Alternatively, as shown in FIG. 2B, an active material forming material containing at least an electrode active material and a binder is supplied to the concave / convex pattern 34 formed on the lower mold 32, and as shown in FIG. The active material forming material is pressed against the active material forming material on the lower die 32 until the active material forming material enters the concave portion of the concave / convex pattern 35 formed on the upper die 33. It is dried while being pressed with the upper mold 33.

  Thereafter, as shown in FIG. 4B, the lower mold 32 not serving as a current collector is peeled off. At this time, since the convex portion 34a of the concave / convex pattern 34 of the lower mold 32 has a draft, the fixing force between the upper mold 33 and the active material for power storage device 36 is higher than the fixing force between the lower mold 32 and the active material for power storage device 36. Therefore, the upper die 33 is not peeled off from the active material 36 for the electricity storage device, and the active material layer made of the active material 36 for the electricity storage device is fixed to the upper die 33 that also serves as a current collector. The electrode 40 will be manufactured.

  Thus, as in FIG. 3, the upper mold 33 that also serves as a current collector can be left as it is without being peeled off from the active material layer made of the active material 36 for the electricity storage device. Thus, the trouble of fixing the active material layer to the current collector can be saved, and the current collector can be easily fixed to the active material layer, whereby the production of the electrode for the electricity storage device can be simplified.

  As described above, the electricity storage device electrodes 10, 20, 30, and 40 manufactured using the manufacturing method illustrated in FIGS. 1 to 4 have one side of the electricity storage device active material 6, 16, 26, and 36 as the active material layer. Since the current collectors 7, 17, 23, and 33 are fixed to the surface of the active material layer, the concave / convex pattern having a very fine size of μm and sub-μm and having an arbitrary shape is reproducible on both sides of the active material layer. It can be formed well and the internal resistance can be sufficiently reduced.

  And when manufacturing an electrical storage device using the electrical storage device electrode 10, 20, 30, 40 manufactured using the manufacturing method shown in FIGS. 1 to 4 as described above, for example, as shown in FIG. One power storage device electrode is a positive electrode body 103 composed of a current collector 101 for exchanging electricity with the outside and an active material layer 102, and another one power storage device electrode is also a current collector. A negative electrode body 104 including 101 and an active material layer 102 is used. In order to prevent contact between the positive electrode body 103 and the negative electrode body 104, a separator 105 is provided between them, and the positive electrode body 103, the negative electrode body 104, and the separator 105 are impregnated with an electrolytic solution and sealed in the case 106. Is done.

  As a result, uneven patterns are formed on both the front and back surfaces of the active material forming material, so that the internal resistance of the active material layer itself is low, the electrical connection between the active material layer and the current collector is good, and high output characteristics Thus, an electric storage device such as an electric double layer capacitor can be obtained.

(A) thru | or (E) is a manufacturing-process figure of the electrode for electrical storage devices by this invention. (A) thru | or (E) is a manufacturing-process figure of the electrode for another electrical storage device by this invention. (A) And (B) is a manufacturing-process figure of another electrode for electrical storage devices by this invention. (A) And (B) is a manufacturing-process figure of another electrode for electrical storage devices by this invention. (A) is an enlarged view of the convex portion of the concave / convex pattern formed in the lower mold used in the manufacturing process shown in FIG. 4, and (B) is an enlarged view of the convex portion of the concave / convex pattern formed in the upper die. It is a cross-sectional block diagram of the electrical storage device by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Active material formation material 2 Lower mold | type 3 Upper mold | type 4 Lower mold | die uneven | corrugated pattern 5 Upper mold | die uneven | corrugated pattern 6 Active material for electrical storage devices 7 Current collector 8 Uneven pattern of the back surface of the active material for electrical storage devices 9 Active material for electrical storage devices Surface irregularity pattern 10 Electrode for power storage device 11 Active material forming material 12 Lower mold 13 Upper mold 14 Lower mold uneven pattern 15 Upper mold uneven pattern 16 Current storage device active material 17 Current collector 18 Power storage device active material Uneven pattern on the back surface 19 Uneven pattern on the surface of the active material for the electricity storage device 20 Electrode for electricity storage device 22 Lower mold 23 Upper mold that also serves as a current collector 24 Uneven pattern on the lower mold 25 Uneven pattern on the upper mold 26 Active material for the electricity storage device 30 Electrode for power storage device 32 Lower mold 33 Upper mold also serving as a current collector 34 Lower mold uneven pattern 35 Upper mold uneven pattern 36 Storage Active material for electric device 40 Electrode for electric storage device 101 Current collector 102 Active material layer 103 Positive electrode body 104 Negative electrode body 105 Separator 106 Case θ Side surface inclination angle

Claims (12)

  An active material for an electricity storage device, wherein an active material forming material containing at least an electrode active material and a binder is used, and concave and convex patterns are formed on both front and back surfaces.   An active material forming material containing at least an electrode active material and a binder is supplied between a lower mold and an upper mold in which the concavo-convex patterns formed to face each other, and the active material forming material is the lower mold A method for producing an active material for an electricity storage device, wherein the lower mold and the upper mold are peeled off after being pressed between the mold and the upper mold.   It manufactures with the manufacturing method of Claim 2, The active material for electrical storage devices characterized by the above-mentioned.   An active material forming material containing at least an electrode active material and a binder is supplied to the concavo-convex pattern formed on the lower mold, and the upper mold until the active material forming material enters the concavo-convex pattern formed on the upper mold. A method for producing an active material for an electricity storage device, wherein the upper mold and the lower mold are peeled off after being pressed against the active material forming material.   It manufactures with the manufacturing method of Claim 4, The active material for electrical storage devices characterized by the above-mentioned.   A method for producing an electrode for an electricity storage device, wherein the active material for an electricity storage device according to claim 3 is used as an active material layer, and a current collector is fixed to one surface thereof.   A method for producing an electrode for an electricity storage device, wherein the active material for an electricity storage device according to claim 5 is used as an active material layer, and a current collector is fixed to one surface thereof.   Either the lower mold or the upper mold also serves as a current collector, and the surface area of the concave / convex pattern formed on one mold serving also as the current collector is larger than the surface area of the concave / convex pattern formed on the other mold. The active material forming material containing at least an electrode active material and a binder is pressed by the lower mold and the upper mold, and then the other mold is peeled off. The manufacturing method of the electrode for electrical storage devices.   Either the lower mold or the upper mold also serves as a current collector, and the side surface inclination angle of the concave / convex pattern formed on one mold serving as the current collector is the side slope of the concave / convex pattern formed on the other mold. An active material forming material that is larger than the angle and includes at least an electrode active material and a binder is pressed by the lower mold and the upper mold, and then the other mold is peeled off. A method for producing an electrode for an electricity storage device.   An electrode for an electricity storage device, which is manufactured by the manufacturing method according to claim 6.   It forms using the electrode for electrical storage devices of Claim 10, The electrical storage device characterized by the above-mentioned.   The electric storage device according to claim 11, wherein the electric storage device is an electric double layer capacitor.

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