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:
Jul. 21, 2020
Filed:
Mar. 29, 2012
Hideo Sakata, Settsu, JP;
Meiten Koh, Settsu, JP;
Akiyoshi Yamauchi, Decatur, AL (US);
Hitomi Nakazawa, Settsu, JP;
Tomoyo Sanagi, Moriguchi, JP;
Aoi Nakazono, Settsu, JP;
Yuki Adachi, Settsu, JP;
Kyouhei Sawaki, Settsu, JP;
Akinori Tani, Settsu, JP;
Masahiro Tomita, Settsu, JP;
Michiru Kagawa, Settsu, JP;
Hideo Sakata, Settsu, JP;
Meiten Koh, Settsu, JP;
Akiyoshi Yamauchi, Decatur, AL (US);
Hitomi Nakazawa, Settsu, JP;
Tomoyo Sanagi, Moriguchi, JP;
Aoi Nakazono, Settsu, JP;
Yuki Adachi, Settsu, JP;
Kyouhei Sawaki, Settsu, JP;
Akinori Tani, Settsu, JP;
Masahiro Tomita, Settsu, JP;
Michiru Kagawa, Settsu, JP;
DAIKIN INDUSTRIES, LTD., Osaka, JP;
Abstract
The present invention provides a lithium ion secondary cell excellent in high-temperature storage characteristics and high voltage cycle characteristics; and a nonaqueous electrolyte for the cell. The present invention relates to a lithium ion secondary cell, comprising a positive electrode, a negative electrode, and a nonaqueous electrolyte containing nonaqueous solvents and an electrolyte salt, the nonaqueous solvents comprising a fluorine-containing ether represented by the formula (1):Rf—O—Rf  (1)wherein Rfand Rfare the same as or different from each other, each being a Calkyl group or a Cfluoroalkyl group; and at least one of Rfand Rfis a fluoroalkyl group, and the following compounds (I) and (II): (I) a fluorine-containing unsaturated compound; and (II) a hydroxy group-containing compound represented by the formula (2):RfOH  (2)wherein Rfis the same as above, and the nonaqueous solvents comprising the compounds (I) and (II) in a total amount of 5000 ppm or less for the fluorine-containing ether.