The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 06, 2014
Filed:
Aug. 31, 2012
Soichiro Kawakami, Machida, JP;
Norishige Kakegawa, Chofu, JP;
Akio Kashiwazaki, Yokohama, JP;
Toshiaki Aiba, Fujisawa, JP;
Rie Ueno, Hadano, JP;
Mikio Shimada, Kawasaki, JP;
Kaoru Ojima, Kawasaki, JP;
Takashi Noma, Hadano, JP;
Soichiro Kawakami, Machida, JP;
Norishige Kakegawa, Chofu, JP;
Akio Kashiwazaki, Yokohama, JP;
Toshiaki Aiba, Fujisawa, JP;
Rie Ueno, Hadano, JP;
Mikio Shimada, Kawasaki, JP;
Kaoru Ojima, Kawasaki, JP;
Takashi Noma, Hadano, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A method of producing a material capable of electrochemically storing and releasing a large amount of lithium ions is provided. The material is used as an electrode material for a negative electrode, and includes silicon or tin primary particles composed of crystal particles each having a specific diameter and an amorphous surface layer formed of at least a metal oxide, having a specific thickness. Gibbs free energy when the metal oxide is produced by oxidation of a metal is smaller than Gibbs free energy when silicon or tin is oxidized, and the metal oxide has higher thermodynamic stability than silicon oxide or tin oxide. The method of producing the electrode material includes reacting silicon or tin with a metal oxide, reacting a silicon oxide or a tin oxide with a metal, or reacting a silicon compound or a tin compound with a metal compound to react with each other.