Toyota Jidosha Kabushiki Kaisha

Dowa Holdings Co., Ltd.

Nariaki Miki

Hajime Hasegawa

Takayuki Uchiyama

Kazuki Muraishi

Kengo Matsuo

Yuki Matsushita

Masahiro Iwasaki

Tomoya Suzuki

Koichi Sugiura

Koji Tanoue

Yoshiaki Aiki

Sachie Akiba

Kouichi Sugiura

Provided is a cathode that is configured to decrease battery resistance when it is used in an all-solid-state battery, and a method for producing the cathode. Disclosed is a cathode comprising a cathode layer for all-solid-state batteries, wherein the cathode layer contains cathode active material particles and solid electrolyte particles; wherein at least one of the cathode active material particles and the solid electrolyte particles contain a phosphorus element; and wherein, in a photoelectron spectrum by X-ray photoelectron spectroscopy measurement of the cathode layer, a P peak intensity ratio (A/B), which is derived from the phosphorus element, of a signal intensity A at a binding energy of 131.6 eV to a signal intensity B at a binding energy of 133.1 eV, is larger than 0.58.

Cathode, all-solid-state battery and methods for producing them

A lithium niobate with high lithium ion conductivity. Disclosed is a method for producing a lithium niobate for use in a covering layer covering at least part of a surface of cathode active material particles, the method comprising: preparing a solution containing niobium ions and lithium ions, drying the solution to obtain a lithium niobate precursor, and heating the lithium niobate precursor at a temperature of from 250° C. to 300° C. for a heating time of more than 0 minute and 10 minutes or less.

Lithium niobate and method for producing the same

Provided is a powder conveying system configured to prevent moisture adsorption to powder during powder conveyance. The powder conveying system comprises: a conveying path, a conveying device wherein the conveying device is a part of the conveying path or is connected with the conveying path; a measuring device wherein the measuring device is a part of the conveying path or is connected with the conveying path; a controlling device wherein the controlling device is a part of the conveying path or is connected with the conveying path; and a judging device wherein the judging device is connected with the measuring device and the controlling device.

Powder conveying system

Provided is an active material composite powder with which resistance can be reduced, and a method for manufacturing the active material composite powder. The active material composite powder includes an active material and lithium niobate attached onto the surface of the active material, and its BET specific surface area S [m/g] is 0.93&#x3c;S&#x3c;1.44, and the method for manufacturing an active material composite powder includes a spraying and drying step of spraying a solution including lithium and a peroxo complex of niobium onto the active material and at the same time drying the solution, and a heating treatment step of carrying out a heating treatment after the spraying and drying step, wherein the temperature of the heating treatment is higher than 123&#xb0; C. and lower than 350&#xb0; C.

Active material composite powder, lithium battery, and method for manufacturing the same

The present invention is to provide an electrode active material and a method for producing the same capable of preventing production of foreign substance, poor coating and deterioration of electrode active material upon covering the surface of the electrode active material with ion conductive oxide, decreasing battery resistance and having higher output of battery. Disclosed is a method for producing an electrode active material, the surface of which is covered with ion conductive oxide, comprising the steps of: preparing an alkoxide solution by mixing at least alkoxide compound and liquid water; and applying and drying the alkoxide solution on a surface of an electrode active material under dry atmosphere, and an electrode active material, the surface of which is covered with ion conductive oxide, wherein an area on the surface of the electrode active material occupied by a substance other than the ion conductive oxide is 21% or less.

Method for producing electrode active material and electrode active material

An active material composite particle is capable of suppressing a reaction with a sulfide solid electrolyte material at high temperature. The active material composite particle may include an oxide active material of rock salt bed type and a coat layer containing lithium niobate formed on a surface of the oxide active material, wherein a thickness of the coat layer is in the range of 25 nm to 94 nm.

Active material composite particle, electrode active material layer, and all solid lithium battery

Provided is an active material composite particle with which the reaction resistance of a battery can be reduced. The active material composite particle includes an active material and a lithium niobate layer formed on a surface of the active material, wherein the lithium niobate layer includes nitrogen.

Active material composite particle and lithium battery

A cathode active material layer used for an all solid lithium battery, comprising a flat cathode active material with a hollowness in a range of more than 0% to 10%, and a solid electrolyte material, characterized in that the flat cathode active material has an aspect ratio (long axis length/short axis length) of 1.5 or more in a section in a thickness direction of the cathode active material layer, and a ratio of the flat cathode active material of which the short axis direction corresponds to a thickness direction of the cathode active material layer is 30% or more with respect to the whole cathode active material.

Cathode active material layer, all solid lithium battery, and method of manufacturing cathode active material layer

The problem to be solved by the present invention is to provide a composite active material having favorable electron conductivity. The present invention solves the problem by providing a composite active material comprising an active material, a coat layer with an average thickness of less than 100 nm, formed on a surface of the active material and composed of an ion conductive oxide, and carbon particles penetrating the coat layer, formed on a surface of the active material.

Composite active material, solid state battery and method for producing composite active material

An active material powder includes an active material particle, and a coating layer. The coating layer contains LiNbOand has pores. When a total volume of pores having a diameter of 2 nm to 7 nm and a total volume of pores having a diameter of 2 nm to 200 nm are respectively represented by Vand V, V/Vis 0.185 or less. In addition, a method of producing an active material powder includes: obtaining, with a fluidized bed granulating-coating machine, a powder including an active material particle to which an alkoxide compound is attached; and promoting hydrolysis of the alkoxide compound by exposing the powder to a humidified inert gas atmosphere. An intake-gas temperature of the fluidized bed granulating-coating machine is 100&#xb0; C. or higher. A time during which the powder is exposed to the humidified inert gas atmosphere is four hours or longer.

Active material powder and method of producing the same

A method of producing a composite active material having an active material and a coat layer containing an ion conductive oxide and formed on a surface of the active material, including: applied film forming step of forming an applied film by applying a coating liquid for coat layer, containing an alkoxide compound as a raw material of the ion conductive oxide, on a surface of the active material under an atmosphere of lower dew-point temperature than dew-point temperature where the active material deteriorates; hydrolysis promoting step of promoting hydrolysis of the alkoxide compound by exposing the applied film under an atmosphere of higher dew-point temperature than dew-point temperature in the applied film forming step; and heat-treating step of forming the coat layer by heat-treating the applied film after the hydrolysis promoting step.

Producing method of composite active material, coating apparatus, composite active material and all solid state battery

The invention provides a solid-state battery electrode formed of a lithium ion conductor, an active material, and a solid electrolyte and including a granule that contains a plurality of lithium ion conductors and a plurality of active materials, as well as a method of producing a solid-state battery electrode that has a step of preparing a granule that contains a plurality of lithium ion conductors and a plurality of active materials and a step of uniformly mixing the granule with a solid electrolyte.

Solid-state battery electrode

The problem of the present invention is to provide a composite active material, which may restrain cracking and peeling of a coating layer, when the composite active material having an active material and the coating layer for coating the surface thereof is kneaded. The present invention solves the above-mentioned problem by providing a composite active material including an active material and a coating layer for coating the surface of the above-mentioned active material, in which microparticles are disposed on the surface thereof, characterized in that the above-mentioned microparticles have a smaller particle diameter than the particle diameter of the active material, and contain Si.

Composite active material, method for producing composite active material, and battery

A main object of the present invention is to provide a composite active material provided with a coating layer having satisfactory electron conductivity. The object is attained by providing a composite active material including an active material and a coating layer that is formed on the surface of the active material and contains a carbonaceous material and an ion conductive oxide, wherein the elemental carbon concentration of the coating layer surface is 17.0 atm % or more.

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Susono, Japan

Nariaki Miki