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:
Jan. 04, 2011
Filed:
Jan. 25, 2008
Takefumi Okumura, Hitachinaka, JP;
Takahiro Yamaki, Hitachinaka, JP;
Masanori Yoshikawa, Hitachinaka, JP;
Yoshimi Yanai, Kitaibaraki, JP;
Toyotaka Yuasa, Hitachi, JP;
Takefumi Okumura, Hitachinaka, JP;
Takahiro Yamaki, Hitachinaka, JP;
Masanori Yoshikawa, Hitachinaka, JP;
Yoshimi Yanai, Kitaibaraki, JP;
Toyotaka Yuasa, Hitachi, JP;
Hitachi Vehicle Energy, Ltd., Ibaraki, JP;
Abstract
The present invention provides a lithium secondary battery which has improved safety, mainly coming from use of an electrolyte solution which is not inflammable at room temperature (20° C.), while not deteriorating output characteristics at low temperatures and room temperature or output maintenance characteristics after storage at high temperature (50° C.). The lithium secondary battery of the present invention, encased in a container, is provided with a cathode and an anode, both capable of storing/releasing lithium ions, a separator which separates these electrodes from each other, and an electrolyte solution containing a cyclic carbonate and a linear carbonate as solvents and a compound such as VC at composition ratios of 18.0 to 30.0%, 74.0 to 81.9% and 0.1 to 1.0%, respectively, based on the whole solvents, all percentages by volume.