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. 02, 2019
Filed:
Mar. 27, 2013
Nec Energy Devices, Ltd., Sagamihara-shi, Kanagawa, JP;
Takeshi Azami, Kanagawa, JP;
NEC ENERGY DEVICES, LTD., Sagamihara-shi, Kanagawa, JP;
Abstract
Provided is a lithium ion secondary cell using lithium manganese-based oxide as a positive electrode active material, wherein SEI films suppressing deterioration during repeated charge/discharge are easily formed not only on the negative electrode surface, but also on the positive electrode surface, deterioration in capacity upon use, in particular, under high-temperature environments is suppressed, charge/discharge cycle characteristics are improved and lifespan is lengthened. The lithium ion secondary cell includes a positive electrode active material layer containing lithium manganese-based oxide as a positive electrode active material, a negative electrode active material layer containing a negative electrode active material, and an electrolytic solution used to immerse the positive electrode active material layer and the negative electrode active material layer, wherein the positive electrode active material layer contains carbon nanotubes and the electrolytic solution contains sulfonic acid ester.