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:
Dec. 15, 2015
Filed:
Aug. 19, 2011
Katsunori Nishimura, Hitachiota, JP;
Yoshiaki Kumashiro, Kasama, JP;
Kazushige Kohno, Hitachi, JP;
Toshiyuki Kobayashi, Tokai, JP;
Katsunori Nishimura, Hitachiota, JP;
Yoshiaki Kumashiro, Kasama, JP;
Kazushige Kohno, Hitachi, JP;
Toshiyuki Kobayashi, Tokai, JP;
Shin-Kobe Electric Machinery Co., Ltd., Tokyo, JP;
Abstract
Provided is a technique of achieving a longer-life lithium ion secondary battery. The lithium ion secondary battery includes a cathode including a cathode active material containing Mn, an anode including an anode active material containing graphite and non-aqueous electrolytic solution including electrolyte, and LiBFand LiPFare allowed to coexist in the non-aqueous electrolytic solution. Especially preferably LiPFis contained more than LiBFin the electrolytic solution. Preferably the electrolytic solution further includes iodide salt. As a result, an oxide of phosphor and boron is deposited on the cathode, thus preventing elution of Mn included in the cathode. The amount of these electrolytes is preferably in the decreasing order of phosphor, boron and then iodine.