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:
Jun. 16, 2015
Filed:
Jan. 28, 2011
Shunsuke Kurasawa, Fukushima, JP;
Takashi Fujinaga, Fukushima, JP;
Momoe Adachi, Tokyo, JP;
Kenichi Kawase, Fukushima, JP;
Shunsuke Kurasawa, Fukushima, JP;
Takashi Fujinaga, Fukushima, JP;
Momoe Adachi, Tokyo, JP;
Kenichi Kawase, Fukushima, JP;
SONY CORPORATION, Tokyo, JP;
Abstract
There is provided an anode for a lithium ion secondary battery capable of improving the cycle characteristics, a lithium ion secondary battery using the same, an electric power tool using the lithium ion secondary battery, an electrical vehicle using the lithium ion secondary battery, and an electric power storage system using the lithium ion secondary battery. The anode for a lithium ion secondary battery includes an anode active material layer in which a first layer and a second layer respectively containing silicon and a metal element as an anode active material are alternately layered on an anode current collector, and 1.02≦A/B≦50 is satisfied. A represents a silicon content ratio in the anode active material in the first layer, and B represents a silicon content ratio in the anode active material in the second layer.