JP2005280164A - Composite sheet body and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite sheet body which restrains the separation and scattering of fine powder of hydrogen occluding alloy while taking advantage of an increase in the absorption/emission of hydrogen as a merit ensuing from the pulverization of the hydrogen-occluding alloy and can be manufactured in a simple way, and a method for manufacturing the composite sheet body. <P>SOLUTION: In this composite sheet body, a power layer 2 including the fine powder of the hydrogen occluding alloy is formed on the surface of a porous sheet base 1 such as mesh, and a porous metal-plated layer 3 is formed by electroless-plating the entire powder layer 2. The porous metal-plated layer 3 has an excellent gas permeability by adding fine particles of a substance other than a metal such as PTFE to make the layer porous. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a composite sheet carrying a hydrogen storage alloy fine powder and a method for producing the same.

  In recent years, hydrogen storage alloys have attracted attention as materials used for secondary batteries and fuel cells. Hydrogen storage alloys have the property of absorbing hydrogen by lowering the ambient temperature or increasing the surrounding hydrogen pressure and releasing hydrogen by raising the ambient temperature or lowering the surrounding hydrogen pressure. Taking advantage of these characteristics, it is used for hydrogen storage bodies such as fuel cells, electrode materials for secondary batteries, hydrogen permeable membranes and hydrogen permeable electrodes for fuel cells, and the like.

  It is known that a hydrogen storage alloy is pulverized by repeatedly absorbing and releasing hydrogen, causing distortion in the crystal lattice and generating many cracks in the alloy. Although the contact area with hydrogen increases by pulverization, the absorption and release action of hydrogen increases, but problems such as falling off the support and scattering to the surroundings, and deterioration of thermal conductivity have also been pointed out. Yes.

  In order to cope with such problems, it has been proposed to perform various treatments on the hydrogen storage alloy. For example, in Patent Document 1, a surface of a hydrogen storage alloy material powder is coated with a nickel and / or copper porous metal film by an autocatalytic electroless plating method using a reducing agent, and this powder is coated with a highly thermally conductive porous metal. A hydrogen storage alloy molded body filled in a body and compression molded is described. Patent Document 2 discloses a hydrogen storage alloy material characterized in that a conductive powder and a cuprous oxide powder are bonded and coated on the surface of the hydrogen storage alloy powder, and the whole is coated with an antioxidant. Has been described. In Patent Document 3, the surface of the hydrogen-absorbing alloy particles is coated with metal plating, and a resin having water repellency is dispersed in the metal plating to improve conductivity by metal plating and bind to other particles with the resin. The point that it was made to wear is described.

As a method of forming the hydrogen storage alloy powder thus processed into a sheet shape, for example, in Patent Document 4, a hydrogen storage alloy powder in which a composite coating plating of fluororesin powder and nickel is formed by an electroless dispersion nickel plating method. In addition, it is described that a paste in which a binder, a conductive agent, and water are added is applied to a metal substrate to form an electrode material. Patent Document 5 describes that a hydrogen storage alloy powder whose surface is plated or coated with a metal is formed into a sheet shape and rolled together with a thin band metal to form a plate shape.
Japanese Patent Publication No. 3-50801 Japanese Examined Patent Publication No. 6-102802 JP-A-5-159798 JP-A-6-223824 JP 2001-11507 A

  In the above-mentioned prior literature, in order to cope with the pulverization of the hydrogen storage alloy, the hydrogen storage alloy powder is so-called encapsulated so that the pulverization does not proceed. Since it is coated, it is unavoidable to affect the absorption / release action of hydrogen, and the merit of increasing the absorption / release action of hydrogen due to the increase in the surface area of the hydrogen storage alloy accompanying pulverization is diminished. Furthermore, a processing step for encapsulating the powder is required, which causes an increase in cost.

  Therefore, in the present invention, it is possible to suppress the dropping and scattering of the hydrogen storage alloy fine powder while taking advantage of the hydrogen absorption / release action associated with the pulverization of the hydrogen storage alloy, and to simplify the production thereof. It aims at providing a composite sheet body and its manufacturing method.

  The composite sheet according to the present invention includes a porous sheet base, a hydrogen storage alloy fine powder layer laminated on the surface of the sheet base, and the sheet and hydrogen storage alloy fine powder layer. It consists of the porous metal plating layer formed so that the whole may be coat | covered.

  Another composite sheet according to the present invention includes a porous sheet base, a conductive layer formed on the surface of the sheet base and containing hydrogen storage alloy fine powder, the sheet, and the entire conductive layer. And a porous metal plating layer formed so as to cover the substrate.

  Furthermore, the void formed in the sheet base of the composite sheet is formed to be smaller than the particle size of the hydrogen storage alloy fine powder. Furthermore, the sheet substrate is a woven fabric or a non-woven fabric. Moreover, the metal of the said porous metal plating layer of the said composite sheet body is Ni, Ni type alloy, Cu, Cu type alloy, Sn, Cr, Zn, Co, Ti, Al, Au, Ag, Pt, Pt type alloy , Pd, Rh, Ru are one metal selected from the group. Furthermore, the metal of the porous metal plating layer is one metal selected from the group of Ni-P, Ni-B, Ni-Cu-P, Ni-Co-P, and Ni-Cu-B. . Furthermore, the porous metal plating layer is a metal plating layer containing fine particles other than metal. Further, the fine particles include polytetrafluoroethylene (PTFE), polyethylene (PE), polypropylene (PP), ABS resin, polyamide (PA), polysulfone (PSU), AS resin, polystyrene (PS), vinylidene chloride resin ( PVDC), vinylidene fluoride resin, PFA resin, polyphenylene ether (PFE), methylpentene resin, methacrylic acid resin, carbon (C), catalyst-supporting fine particles, and thermosetting resin. Of fine particles.

  In the method for producing a composite sheet according to the present invention, hydrogen storage alloy fine powder is laminated and bound on the surface of a porous sheet substrate, and electroless plating is performed in a solution in which a metal compound is dissolved. Thus, a metal plating layer is formed so as to cover the sheet body and the entire hydrogen storage alloy fine powder layer, and the metal plating layer is made porous.

  Another method for producing a composite sheet according to the present invention is to stack and bind a hydrogen storage alloy fine powder on the surface of a porous sheet base to dissolve a metal compound and disperse fine particles other than metal. By performing electroless plating in the solution thus formed, a metal plating layer containing fine particles other than metal is formed so as to cover the sheet body and the entire conductive layer.

  Another method for producing a composite sheet according to the present invention is to form an electroconductive layer containing hydrogen storage alloy fine powder on the surface of a porous sheet substrate, and electroless plating in a solution in which the metal compound is dissolved. To form a metal plating layer so as to cover the sheet body and the entire hydrogen storage alloy fine powder layer, and the metal plating layer is made porous.

  In another method for producing a composite sheet according to the present invention, a conductive layer containing a hydrogen storage alloy fine powder is formed on the surface of a porous sheet substrate, and a metal compound is dissolved and fine particles other than metal are formed. By performing electroless plating in a dispersed solution, a metal plating layer containing fine particles other than metal is formed so as to cover the entire sheet and the conductive layer.

  Further, in the above manufacturing method, the conductive layer is formed by applying to the surface of the sheet substrate.

  Since the composite sheet body according to the present invention has the above-described configuration, the sheet base is loaded with the hydrogen storage alloy fine powder and is entirely covered with the porous metal plating layer. Even when the fine powder is further atomized, it is prevented from falling off or scattering from the sheet substrate, and the hydrogen absorption / release action associated with the fine powder is increased. It becomes possible to cope with. And since the sheet | seat base | substrate is formed porous, since a metal plating layer penetrates into the inside of a sheet | seat base | substrate and seals hydrogen storage alloy fine powder, the inhibitory effect with respect to drop-off and scattering can be heightened more.

  In addition, the metal plating layer is formed to be porous and has gas permeability and conductivity, so that the hydrogen storage alloy powder can perform the hydrogen absorption / release action without any trouble.

  The method for producing a composite sheet according to the present invention has the above-described configuration, and in a solution in which hydrogen storage alloy fine powder is laminated on the surface of a porous sheet base and a metal compound is dissolved. By applying electroless plating, a metal plating layer is formed so as to cover the entire sheet body and the hydrogen storage alloy fine powder layer, and the metal plating layer is made porous, thereby easily producing a composite sheet. can do.

  Further, another method for producing a composite sheet according to the present invention has the above-described configuration, so that a conductive layer containing a hydrogen storage alloy is formed on a sheet base, and the metal compound is completely dissolved and the metal is dissolved. Since electroless plating is performed in a solution in which fine particles other than those are dispersed, it can be easily manufactured, the manufacturing process is simplified, and the manufacturing cost can be reduced.

  Hereinafter, embodiments according to the present invention will be described in detail. The embodiments described below are preferable specific examples for carrying out the present invention, and thus various technical limitations are made. However, the present invention is particularly limited in the following description. Unless otherwise specified, the present invention is not limited to these forms.

  FIG. 1 schematically shows a cross-sectional view of the present embodiment. A powder layer 2 containing hydrogen storage alloy fine powder 20 is laminated on the upper surface of the sheet substrate 1, and a porous metal plating layer 3 is formed so as to cover the entire sheet substrate 1 and the powder layer 2. .

  The powder layer 2 may be formed by laminating the hydrogen storage alloy fine powder 20 on the surface of the sheet substrate 1 and binding it by plating or the like, or by laminating a conductive paste in which the hydrogen storage alloy fine powder 20 is kneaded in advance. And may be attached.

  The sheet substrate 1 is formed to be porous, and specific examples thereof include woven fabrics such as meshes and wrinkles, non-woven fabrics, foams, and the like. The size of the porous hole is set smaller than the particle size of the hydrogen storage alloy fine powder 20, and is set to 0.01 μm to 1000 μm, preferably 1 μm to 10 μm. The thickness is preferably as thin as possible and is flexible enough to bend easily. Examples of the material include synthetic resins, inorganic materials such as metals or ceramics, and inorganic fibers such as synthetic fibers, natural fibers, and glass fibers. Further, metal fibers or fibers provided with conductivity in advance can also be used.

  When a woven fabric such as a mesh or a cocoon is used, it is possible to easily design a porous structure such that the pores can be formed uniformly. In addition, when a woven fabric is used, an extremely thin sheet substrate can be formed with thin threads. By using such a thin sheet substrate, a composite sheet having high flexibility can be obtained.

  In the powder layer 2, if the hydrogen storage alloy fine powder 20 is laminated and bonded by plating, no substance other than the hydrogen storage alloy fine powder 20 is laminated, so that the performance of the hydrogen storage alloy fine powder 20 is more easily exhibited. . Further, in the case of binding with a conductive paste, in addition to the hydrogen storage alloy fine powder 20, a conductive material and an adhesive are included, and the conductivity of the entire conductive layer is ensured by the conductive material, and the sheet is formed by the adhesive. The fixing property to the substrate 1 is improved.

The layer thickness of the powder layer is preferably about 0.01 to 1 mm, but can be formed thinner than this. As the hydrogen storage alloy, conventionally known alloys such as those listed below can be used, and those having a particle size of 0.01 μm to 2 mm can be used, and those having a particle size of 0.1 to 10 μm are preferable.
(1) AB ₅ type (rare earth) alloy LaNi ₅ , LaNi ₄ Cu, LaNi ₄ Al, LaNi _2.5 Co _2.5 , La _0.8 Nd _0.2 Ni ₂ Co ₃ , La _0.7 Nd _0.2 Ti _0.1 Ni _2.5 Co _2.4 Al _0.1 , La _0.8 Nd _0.2 Ni _2.5 Co _2.4 Si _0.1 , La _0.9 Zr _0.1 Ni _4.5 Al _0.5 , MmNi ₅ (Mm = Mish metal), MmNi _3.55 Co _0.75 Mn _0.4 Al _0.3 , MmNi _4.2 Mn _0.6 Al _0.2 , MmNi ₃ Co _1.5 Al _0.5 , MmB _x (x = 4.55-4.76, B = Ni, Co, Mn, Al).
(2) AB / A ₂ B type (titanium-based) alloys TiNi, Ti ₂ Ni, TiMn _1.5 , Ti ₂ Ni—TiNi based multi-component alloys (V, Cr, Zr, Mn, Co, Cu, Fe, etc. partial _{replacement); Ti 1-y Zr y} Ni x (x = 0.5~1.45, y = 0~1).
(3) AB ₂ type (Laves phase) alloy _{Ti 2-x Zr x V 4} -y Ni y, Ti 1-x Cr x V 2-y Ni y, ZrV 0.4 Ni 1.6, ZrMn 0.6 Cr 0.2 Ni 1.2, Ti ₁₇ Zr ₁₅ V ₂₂ Ni ₃₉ Cr ₇ , LaNi ₂ , CeNi ₂ .

  An example of the conductive material contained in the conductive paste is carbon black. Examples of the adhesive include methyl cellulose and polyvinyl alcohol. The addition amount of the hydrogen storage alloy fine powder 20 may be adjusted depending on the performance, and when used as an electrode material of a battery, it can be appropriately set according to the characteristics of the electrode, and is generally added in a volume ratio of 50% to 95%. do it.

  The metal constituting the porous metal plating layer 3 includes Ni, Ni alloy, Cu, Cu alloy, Sn, Cr, Zn, Co, Ti, Al, Au, Ag, Pt, Pt alloy, Pd, Rh. , Ru or a metal selected from the group of Ru or alloys such as Ni-P, Ni-B, Ni-Cu-P, Ni-Co-P, Ni-Cu-B. By using such a metal, a metal plating layer with little variation in physical properties can be obtained. And since it is a metal plating layer, it is excellent in thermal conductivity, contact resistance is small, and the oxidation of hydrogen storage alloy fine powder is also suppressed. In particular, since Ni has high corrosion resistance and acts as a catalyst for the electrochemical reaction of hydrogen, it is also suitable as a polymer solid electrolyte fuel cell.

  When such a metal is formed to be porous, it may be formed to be porous after plating. In the case of forming a porous structure, for example, a calcium carbonate powder or an aluminum powder may be included in the plating process, and the powder may be eluted with an acidic solution or an alkaline solution after forming a plating layer.

  Moreover, a porous metal plating layer can also be comprised by disperse | distributing and containing fine particles other than a metal in the metal mentioned above. As fine particles other than metal, polytetrafluoroethylene (PTFE), polyethylene (PE), polypropylene (PP), ABS resin, polyamide (PA), polysulfone (PSU), AS resin, polystyrene (PS), vinylidene chloride resin (PVDC), vinylidene fluoride resin, PFA resin, polyphenylene ether (PFE), methylpentene resin, methacrylic acid resin, carbon (C), catalyst-supporting fine particles, and thermosetting resin. The particle diameter of the fine particles is preferably 0.01 μm to 500 μm. By using such a compound as fine particles, the metal plating layer is formed to be porous, and excellent gas permeability can be secured, and the characteristics of each compound can be imparted to the metal plating layer.

  Next, the manufacturing method regarding this embodiment is demonstrated. First, as the hydrogen storage alloy fine powder, ingots are mechanically pulverized and classified, and those having a uniform particle size are used. Then, the fine powder is degreased by a known method, subjected to an activation treatment, and then laminated on the sheet substrate 1.

  When the hydrogen storage alloy fine powder is bound to the sheet substrate 1 by plating, a known plating apparatus as shown in FIG. 2 may be used. In the plating apparatus, a cell base 11 is fixed on a turntable 10, and a ring-shaped cathode plate 12 is sandwiched and fixed on the cell base 11 by a cover 13 via a packing to constitute a substantially disk-shaped cell. Yes. A plating solution 14 is stored in the cell, and an anode 15 is inserted into the plating solution 14. The cathode plate 12 is connected to an external power source (not shown) by a brush 16 through the turntable 10. When hydrogen storage alloy powder is put in the plating solution 14 and the turntable 10 is rotated at a high speed (400 rpm), the powder is laminated so as to be pressed against the ring-shaped cathode plate 12 which is the outer peripheral portion of the cell by centrifugal force. become. Therefore, if the sheet base is arranged along the inner surface of the cathode plate 12 in advance, the powder can be formed in a layered state on the sheet base, and the anode can be formed in a state of being laminated to a predetermined thickness. 15 and the cathode plate 12 are energized to perform an electrolytic plating process, and the powder is laminated on the sheet substrate. In addition, when performing an electroplating process, electroconductivity is previously provided to the sheet | seat base | substrate. In this case, since the hydrogen storage alloy powder is covered with the plating layer, the plating layer is preferably made porous. As described above, the porous layer may contain fine particles other than metal in the plating layer as described above.

  Further, the hydrogen storage alloy fine powder is mixed with a conductive material and an adhesive and finished in a paste form. As shown in FIG. 3, the blade 4 is applied to the entire sheet base 1 so as to have a uniform thickness. A conductive layer may be formed as the layer 2. As a method for applying the paste to the sheet substrate 1, a method other than the blade may be used. For example, a method using an application roller or a spray may be used. After applying the paste, a conductive layer having a substantially uniform layer thickness can be formed on the surface of the sheet substrate 1.

  After forming the powder layer 2 on the sheet substrate 1, a metal plating layer is formed by electroless plating. When performing electroless plating, as shown in FIG. 4, the plating is stored in a plating tank 5 and the sheet substrate 1 on which the powder layer 2 is formed is immersed.

  An appropriate amount of calcium carbonate powder or aluminum powder is added to the plating solution, and after plating, these powders are eluted with an acidic solution to make the plating layer porous. Moreover, a porous metal plating layer can be formed by adding an appropriate amount of the above-mentioned fine particles to the plating solution and performing a plating treatment. With this manufacturing method, the porous metal plating layer can be formed by plating, so the manufacturing process can be further simplified.

  The composite sheet produced as described above is rich in flexibility, and for example, as shown in FIG. 5 (a), it is easy to change the shape into a spirally wound state, Suitable for electrode material. Further, as shown in FIG. 5B, a sheet base is formed in a container shape in advance, and a paste-like conductive layer is applied and electroless plating is performed to obtain a container-like composite sheet body. Is also possible. The composite sheet according to the present invention can be easily formed in various shapes as described above.

[Example 1] A plain woven mesh of polyester fibers (300 mesh; mesh size 30 µm; thickness 55 µm) was used as the sheet substrate. As the hydrogen storage alloy fine powder, MmNi _3.55 Co _0.75 Mn _0.4 Al _0.3 was mechanically pulverized and classified to have an average particle size of about 40 μm. Mixing and stirring to a weight ratio of 5% carbon black powder as a conductive material and 5% methylcellulose aqueous solution (concentration 1%) as an adhesive relative to the weight of the hydrogen storage alloy fine powder, a blade is formed on the entire sheet substrate surface. Was applied to form a conductive layer having a layer thickness of about 0.1 mm. After the conductive layer was sufficiently dried, electroless nickel plating was performed. The bath composition and conditions of the plating solution are as follows.
<Plating solution>
Nickel sulfate 15 g / liter Sodium hypophosphite 14 g / liter Sodium hydroxide 8 g / liter glycine 20 g / liter PTFE (particle size 0.3 μm) 15 g / liter surfactant 0.5 g / liter <Condition>
pH 9.5
Bath temperature 90 ° C
Stirring time After 40 minutes of electroless plating treatment, the plate was sufficiently washed with water and vacuum-dried under reduced pressure for 5 hours. The resulting metal plating layer had an average thickness of 1 μm. The metal plating layer contains PTFE fine particles dispersed therein.

[Example 2] As a sheet substrate, a mesh (300 mesh; mesh size 30 μm; thickness 55 μm) plain-woven with polyester fibers imparted with conductivity by copper plating was used. As the hydrogen storage alloy fine powder, MmNi _3.55 Co _0.75 Mn _0.4 Al _0.3 was mechanically pulverized and classified to have an average particle size of about 40 μm. Using the plating apparatus described with reference to FIG. 2, electrolytic nickel plating was performed with the following bath composition and conditions of the plating solution to form a powder layer having a layer thickness of about 0.1 mm on the mesh.
<Plating solution>
_{Ni (NH 2 SO 3) 2} · 4H 2 O 350g / l NiCl ₂ · 6H ₂ O 45g / l H ₃ BO ₃ 40g / l surfactant 1.0 g / l PTFE 100 g / l <Conditions>
pH 4.0
Cathode current density 10A / dm ²
Temperature 50 ℃
Anode Ni plate
Stirring circulation
Plating time 30 minutes (energization time 15 minutes)
The powder layer is bound to the mesh by a plating layer containing PTFE. After the powder layer was sufficiently dried, electroless nickel plating was performed on the entire mesh. The bath composition and conditions of the plating solution are as follows.
<Plating solution>
Nickel sulfate 15 g / liter Sodium hypophosphite 14 g / liter Sodium hydroxide 8 g / liter glycine 20 g / liter calcium carbonate powder (particle size 1 μm) 15 g / liter <Conditions>
pH 9.5
Bath temperature 60 ° C
Agitation time 40 minutes The calcium carbonate powder in the metal plating layer thus formed was eluted with an aqueous acetic acid solution to make it porous.

  A composite sheet having a thickness of about 100 μm was prepared by the above manufacturing process. The prepared composite sheet was flexible and could be easily wound. Moreover, the hydrogen storage alloy fine powder was not scattered from the surface of the sheet body. And since the metal plating layer was made porous, sufficient gas permeability was ensured.

  The composite sheet according to the present invention can be used for hydrogen storage bodies such as fuel cells, electrode materials for secondary batteries, hydrogen permeable membranes and hydrogen permeable electrodes for fuel cells, and the like. It is also suitable as a material for hydrogen gas sensors and hydrogen compression devices.

It is a schematic diagram of the cross section regarding this embodiment. It is sectional drawing regarding a manufacturing apparatus. It is explanatory drawing regarding a manufacturing process. It is explanatory drawing regarding a manufacturing process. It is a figure which shows the article | item shape using this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet | seat base | substrate 2 Powder layer 3 Porous metal plating layer 4 Blade 5 Plating tank 20 Hydrogen storage alloy fine powder

Claims (13)

  A porous sheet base, a hydrogen storage alloy fine powder layer laminated and bound on the surface of the sheet base, and the sheet body and the entire hydrogen storage alloy fine powder layer are formed. A composite sheet body comprising a porous metal plating layer.   A porous sheet substrate, a conductive layer formed on the surface of the sheet substrate and containing hydrogen storage alloy fine powder, and a porous metal formed so as to cover the sheet body and the entire conductive layer A composite sheet comprising a plating layer.   The composite sheet body according to claim 1 or 2, wherein the gap formed in the sheet base is formed smaller than the particle size of the hydrogen storage alloy fine powder.   The composite sheet body according to any one of claims 1 to 3, wherein the sheet base is a woven fabric or a nonwoven fabric.   The metal of the porous metal plating layer is made of Ni, Ni-based alloy, Cu, Cu-based alloy, Sn, Cr, Zn, Co, Ti, Al, Au, Ag, Pt, Pt-based alloy, Pd, Rh, or Ru. The composite sheet body according to any one of claims 1 to 4, wherein the composite sheet body is one metal selected from the group.   The metal of the porous metal plating layer is one metal selected from the group consisting of Ni-P, Ni-B, Ni-Cu-P, Ni-Co-P, and Ni-Cu-B. The composite sheet body according to any one of 1 to 4.   The composite sheet body according to any one of claims 1 to 6, wherein the porous metal plating layer is a metal plating layer containing fine particles other than metal.   The fine particles include polytetrafluoroethylene (PTFE), polyethylene (PE), polypropylene (PP), ABS resin, polyamide (PA), polysulfone (PSU), AS resin, polystyrene (PS), vinylidene chloride resin (PVDC). , At least one fine particle selected from the group consisting of vinylidene fluoride resin, PFA resin, polyphenylene ether (PFE), methylpentene resin, methacrylic acid resin, carbon (C), catalyst-supporting fine particles, and thermosetting resin The composite sheet body according to claim 7.   The sheet body and the hydrogen storage alloy fine powder are obtained by laminating and binding the hydrogen storage alloy fine powder on the surface of the porous sheet base and performing electroless plating in a solution dissolving the metal compound. A method for producing a composite sheet, comprising: forming a metal plating layer so as to cover the entire layer, and making the metal plating layer porous.   By stacking and binding the hydrogen storage alloy fine powder on the surface of the porous sheet substrate, electroless plating in a solution in which the metal compound is dissolved and fine particles other than the metal are dispersed, A method for producing a composite sheet, comprising forming a metal plating layer containing fine particles other than metal so as to cover the entire sheet and the conductive layer.   A conductive layer containing hydrogen storage alloy fine powder is formed on the surface of a porous sheet base, and electroless plating is performed in a solution dissolving a metal compound, whereby the sheet body and the hydrogen storage alloy fine powder are formed. A method for producing a composite sheet, comprising: forming a metal plating layer so as to cover the entire layer, and making the metal plating layer porous.   By forming a conductive layer containing hydrogen storage alloy fine powder on the surface of the porous sheet substrate, and performing electroless plating in a solution in which metal compound is dissolved and fine particles other than metal are dispersed, A method for producing a composite sheet, comprising forming a metal plating layer containing fine particles other than metal so as to cover the entire sheet and the conductive layer.   The method for producing a composite sheet body according to claim 11 or 12, wherein the conductive layer is formed by coating the surface of the sheet substrate.

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