Toda Kogyo Corporation

Nec Corporation

Seisan Kaihatsu Kagaku Kenkyusho

Other

Kabushiki Kaisha Kobe Seiko Sho

Tosoh Corporation

Osaka Cement Co., Ltd.

Matsushita Electric Industrial Co., Ltd.

Japan Science and Technology Agency

Okayama University

Mikio Takano

Jun Takada

Ryoji Kanno

Tatsuya Nakamura

Shigeo Kondo

Kazunori Takada

Toshio Takada

Yoshinari Miura

Kiichi Oda

Naoichi Yamamoto

Hideo Hosono

Yasuo Takeda

Tatsuo Fujii

Makoto Nakanishi

Hiroshi Kageyama

Yoji Kobayashi

Hideki Hashimoto

Toshio Takada, Deceased

Genki Kobayashi

Yoshichika Bando

Junichi Shimoyama

Koichi Kitazawa

Takahito Terashima

Iksu Chong

Takeshi Yajima

By Komichi Takada, Administrator

Zenji Hiroi

Kohji Kishio

By Jun Takada, Administrator

By Kei Takada, Administrator

This invention relates to an anode active material comprising at least one iron oxide selected from the group consisting of amorphous iron oxides, ferrihydrite, and lepidocrocite. The invention also relates to a lithium ion secondary battery anode material comprising the anode active material as a constituent component, a lithium ion secondary battery anode comprising the lithium ion secondary battery anode material, and a lithium ion secondary battery comprising the lithium ion secondary battery anode.

Negative electrode active material and use of same

[Problem] Many oxide-ion conductors exhibit high functionality at high temperatures due to the large weight and charge of oxide ions, and it has been difficult to achieve the functionality at low temperatures. [Solution] A perovskite oxide having hydride ion conductivity, at least 1 at % of the oxide ions (O) contained in a titanium-containing perovskite oxide being substituted with hydride ions (H). This oxide, in which negatively charged hydride ions (H) are used for the ionic conduction, has both hydride ion conductivity and electron conductivity. As a starting material, the titanium-containing perovskite oxide is kept together with a powder of an alkali metal or alkaline-earth metal hydride selected from LiH, CaH, SrH, and BaHin a temperature range of 300&#xb0; C. or higher and lower than the melting point of the hydride in a vacuum or an inert gas atmosphere to substitute some of the oxide ions in the oxide with the hydride ions, resulting in the introduction of the hydride ions into oxygen sites.

Perovskite oxide containing hydride ion, and method for manufacturing same

An oxide superconductor consisting of an oxide which comprises, as constituent metal elements, bismuth, lead, strontium, calcium and copper having a molar ratio of lead to bismuth of at least 0.2:1, and having an internal structure in which domains having a relatively high concentration of lead and no long-period structure are contained in domains having a relatively low concentration of lead and a long-period structure. This oxide superconductor has a storing pinning function and a high critical current density Jc even at a high temperature and a high magnetic field, can be produced by industrial methods, and is easily processed to form wires.

Oxide superconductor

Lithium battery

There are disclosed lithium-iron oxide particles having an excellent properties such as electrochemical reversibility and suitable as a material for cathode active material for lithium ion batteries, which have a corrugated layer crystal structure and are represented by the general formula (1):

Lithium-iron oxide particles and process for producing the same

A lithium iron oxide which can be used as an electrode active material for a lithium battery is disclosed. A lithium iron oxide represented by Li.sub.x FeO.sub.2, where 0&lt;x&lt;2, having a tunnel structure similar to .beta.-FeO(OH) can be synthesized by heating a suspension prepared by suspending .beta.-FeO(OH) and a lithium compound in an alcohol at a temperature of not lower than 50.degree. C., more preferably at a temperature of lower than the boiling point of the alcohol used for the suspension.

Lithium iron oxide, method of its synthesis, and lithium battery using

An oxide superconductor having a composition of the formula: A.sub.n+1 Cu.sub.n O.sub.2n+1+.delta. in which A is at least one alkaline earth metal element selected from the group consisting of calcium, strontium and barium, n is an integer of at least one, and .delta. is a number larger than 0 and not larger than 1, a laminate structure in which a layer having a partial composition of A.sub.2 O.sub.1+.delta. and a layer having a partial composition of A.sub.n-1 Cu.sub.n O.sub.2n are alternately laminated, and a superconductive critical temperature equal to or higher than the liquid nitrogen temperature.

Growing community of inventors

Kyoto, Japan

Mikio Takano