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:
Nov. 26, 1996
Filed:
Mar. 07, 1995
Seiji Yoshimura, Hirakata, JP;
Yuji Yamamoto, Hyogo, JP;
Yoshihiro Shoji, Hirakata, JP;
Koji Nishio, Hirakata, JP;
Toshihiko Saito, Tsuzuki-gun, JP;
Nobuhiro Nishiguchi, Hyogo, JP;
Keiichi Tsujioku, Hyogo, JP;
Minoru Fujimoto, Mihara-gun, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A lithium secondary battery comprises a negative electrode having lithium as an active material, a positive electrode comprising a boron-containing lithium-manganese composite oxide as an active material and a nonaqueous electrolyte comprising a solute and a solvent, the boron-containing lithium-manganese composite oxide having an atomic ratio between B and Mn (B/Mn) of 0.01 to 0.20 and an average valence of manganese before charge-discharge of at least 3.80, and the solvent being a mixed solvent containing 5 to 50% by volume of a butylene carbonate. This battery is highly reliable, since the positive electrode active material minimally decomposes and hence the internal resistance minimally increases, even when the battery is continuously charged at a high voltage by mistake.