Ngk Insulators, Inc.

Naomi Saito

Kenshin Kitoh

Naohito Yamada

Megumi Fujisaki

Naomi Hashimoto

Ozora Kano

Sho Yamamoto

Hiroshi Hayashi

Yoshihiko Yamamura

Tatsuya Hattori

Kazuyuki Matsuda

Kouta Asai

Hiroshi Matsubayashi

Eri Asano

Yukari Sakurayama

Provided is an air electrode/LDH separator assembly including: a rigid porous layer having rigidity and air permeability, wherein the rigidity is defined as a proportion of displacement in a compression direction of less than 3% when pressurized at 0.1 MPa; an air electrode layer that covers both sides of the rigid porous layer, or both sides and end faces of the rigid porous layer provided that at least one end face is excluded; and a layered double hydroxide (LDH) separator that covers an outside of the air electrode layer; wherein i) the rigid porous layer is made of a metal or an electrically conductive ceramic, whereby the rigid porous layer itself functions as a positive electrode current collector, or ii) the rigid porous layer is made of an insulating material and is covered with a porous metal layer, whereby the porous metal layer functions as a positive electrode current collector.

Air electrode/separator assembly and zinc-air secondary battery

Provided is an air electrode/separator assembly including a hydroxide ion conductive dense separator and an air electrode layer provided on one side of the hydroxide ion conductive dense separator. The air electrode layer includes: an internal catalyst layer provided closer to the hydroxide ion conductive dense separator and filled with a mixture containing a hydroxide ion conductive material, an electron conductive material, an organic polymer, and an air electrode catalyst (provided that the hydroxide ion conductive material may be the same material as the air electrode catalyst, and provided that the electron conductive material may be the same material as the air electrode catalyst); and an outermost catalyst layer provided away from the hydroxide ion conductive dense separator having a porosity of 60% or more, composed of a porous current collector and a layered double hydroxide (LDH) covering a surface thereof.

Air electrode/separator assembly and metal-air secondary battery

A layered double hydroxide is represented by the following formula (I): NiFeVCo(OH)A·mHO . . . (I). In one embodiment, in the formula (I), (x+y+z) is from 0.2 to 0.5, 'x' represents more than 0 and 0.3 or less, “y” represents from 0.04 to 0.49, and “z” represents more than 0 and 0.2 or less.

Layered double hydroxide and method for production thereof, and air electrode and metal-air secondary battery that use said layered double hydroxide

Provided is an air electrode/separator assembly including: a hydroxide ion conductive dense separator; an interface layer containing a hydroxide ion conductive material and an electron conductive material and covering one side of the hydroxide ion conductive dense separator; and an air electrode layer provided on the interface layer and including an outermost catalyst layer composed of a porous current collector and a layered double hydroxide (LDH) covering a surface thereof. The outermost catalyst layer has a porosity of 60% or more.

Provided is a negative electrode for use in a zinc secondary battery containing (A) ZnO particles and (B) at least two selected from the group consisting of (i) metallic Zn particles having an average particle size D50 of 5 to 80 &#x3bc;m, (ii) at least one metal element selected from In and Bi, and (iii) a binder resin having a hydroxyl group.

Negative electrode and zinc secondary battery

Provided is a layered-double-hydroxide-(LDH) containing composite material including a porous substrate and a high density LDH-containing functional layer on and/or in the porous substrate. The LDH-containing composite material of the present invention includes the porous substrate and the functional layer formed on and/or in the porous substrate. The functional layer contains a layered double hydroxide represented by the general formula MM(OH)A.mHO (where Mrepresents a divalent cation, Mrepresents a trivalent cation, Arepresents an n-valent anion, n represents an integer not less than 1, x represents a value of 0.1 to 0.4, and m represents a value not less than 0) and has water impermeability.

Layered-double-hydroxide-containing composite material and method for producing same

Disclosed is an air electrode for a metal-air battery, the air electrode including a separator composed of a hydroxide-ion-conductive inorganic solid electrolyte being a dense ceramic material, and an air electrode layer disposed on the separator and containing an air electrode catalyst, an electron-conductive material, and a hydroxide-ion-conductive material, or containing an air electrode catalyst also serving as an electron-conductive material and a hydroxide-ion-conductive material. According to the present invention, the reaction resistance of the air electrode including the dense ceramic separator can be significantly reduced in a metal-air battery while ensuring the desired characteristics of the dense ceramic separator.

Air electrode for metal-air battery

The present invention provides a layered double hydroxide with improved conductivity, a layered double hydroxide and a composite material containing the layered double hydroxide. The layered double hydroxide is represented by the general formula: [MgM1][AlM2](OH)A.mHO, wherein 0.1&#x2264;x&#x2264;0.4, 0&#x2264;y&#x2264;0.95, and 0&#x2264;z&#x2264;0.95, provided that both y and z are not 0 at the same time; &#x3b1;=1 or 2; &#x3b2;=2 or 3; Ais an n-valent anion, provided that n is an integer of 1 or greater; m&#x2265;0; M1is a cation of at least one substituent element selected from monovalent elements, transition metal elements, and other elements with an ionic radius greater than that of Mg; and M2is a cation of at least one element selected from divalent elements, transition metals, and other elements with an ionic radius greater than that of Al.

Layered double hydroxide, layered double hydroxide dense film, and composite material

Provided is a layered double hydroxide oriented membrane in which layered double hydroxide plate-like particles are highly oriented in the approximately perpendicular direction and which is also suitable for densification. The layered double hydroxide oriented membrane of the present invention is composed of a layered double hydroxide represented by the general formula: MM(OH)A.mHO wherein Mis a divalent cation, Mis a trivalent cation, Ais an anion having a valency of n, n is an integer of 1 or greater, x is 0.1 to 0.4, and m is 0 or greater, wherein when a surface of the oriented membrane is measured by X-ray diffractometry, a peak of a (003) plane is not substantially detected or is detected to be smaller than a peak of a (012) plane.

Layered-double-hydroxide-oriented film and method for producing same

The present invention provides and produces a high-grade layered double hydroxide (LDH) dense body having a relative density of 88% or greater in a simple and stable manner. The present invention provides a LDH dense body including a layered double hydroxide as a main phase and having a relative density of 88% or greater, the LDH being represented by general formula: MM(OH)A.mHO wherein Mis a divalent cation, Mis a trivalent cation, Ais an n-valent anion, n is an integer of 1 or greater, and x is 0.1 to 0.4. This LDH dense body can be produced by compacting and firing a raw material powder of a LDH to obtain an oxide fired body, retaining this oxide fired body in or immediately above an aqueous solution comprising an n-valent anion to reproduce the LDH, and removing excessive water from the resulting water-rich LDH solidified body.

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Nagoya, Japan

Naomi Saito