Hitachi, Ltd.

Yusuke Asari

Matahiro Komuro

Shohei Terada

Tadayuki Matsumura

The present invention aims at providing an iron-nitrogen-based soft magnetic steel sheet having a saturation magnetic flux density higher than that of pure iron, a method for manufacturing the soft magnetic steel sheet, and a core and a dynamo-electric machine in which the soft magnetic steel sheet is used. The soft magnetic steel sheet according to the present invention includes C, N, and the balance of Fe and inevitable impurities and is comprised of an α phase, an α' phase, an α″ phase, and a γ phase. The α phase serves as a main phase, a volume ratio of the α″ phase is 10% or more, and a volume ratio of the γ phase is 5% or less. The core according to the present invention includes a laminated body of the soft magnetic steel sheets.

Soft magnetic steel sheet, method for manufacturing the soft magnetic steel sheet, and core and dynamo-electric machine in which the soft magnetic steel sheet is used

A genetic algorithm controller that controls respective processes using a genetic algorithm is configured. The processes include generation of a crystal structure of an inorganic material, a mutation operation of a crystal structure, a crossing-over operation of a crystal structure, structural relaxation calculation of a crystal structure, calculation of a predictive value of an objective function, selection and weeding out of a crystal structure based on a predictive value of an objective function, observation of an objective function value of a crystal structure by first-principle calculation, update of a regression model based on a result of observing the objective function value, and end determination for a material generation process.

Material generation apparatus and material generation method

Provided is a positive electrode active material for lithium ion secondary batteries, having a crystal structure containing a layered LiMnOstructure with a high theoretical electrical capacity as a basic skeleton, and having both a high theoretical electrical capacity and a high open-circuit voltage by increasing an open-circuit voltage to a value of more than 2 V by replacing a part of manganese ions with calcium ions by adding the calcium ions. That is, a positive electrode active material for secondary batteries mainly containing a compound represented by a chemical composition formula LiMnCaO, and an electrode and a battery including the same are realized. In the formula, x satisfies 0&#x3c;x&#x3c;1.3, and y satisfies 0.2&#x3c;y&#x3c;0.9.

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Tokyo, Japan

Yusuke Asari