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:
May. 19, 2020
Filed:
Sep. 23, 2016
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi, JP;
Hiroya Umeyama, Okazaki, JP;
Koji Torita, Nagoya, JP;
Akihiro Taniguchi, Ashiya, JP;
Shuji Tsutsumi, Ikoma, JP;
Tatsuya Hashimoto, Osaka, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, Aichi-ken, JP;
Abstract
A lithium ion secondary battery, improved in durability against high-rate charging/discharging, which includes, in the negative electrode active material layer, a negative electrode active material formed of a graphite carbon material having a graphite structure in at least a part thereof, and a conductive carbon material, which is different from the graphite carbon material and is formed of a conductive amorphous carbon. The negative electrode active material has a bulk density of 0.5 g/cmor more and 0.7 g/cmor less, and a BET specific surface area of 2 m/g or more and 6 m/g or less. The conductive carbon material has a bulk density of 0.4 g/cmor less, and a BET specific surface area of 50 m/g or less.