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. 18, 2021
Filed:
May. 21, 2015
Vehicle Energy Japan Inc., Hitachinaka, JP;
Hironori Sasaki, Tokyo, JP;
Shuichi Suzuki, Tokyo, JP;
VEHICLE ENERGY JAPAN INC., Hitachinaka, JP;
Abstract
An object of the present invention is to provide a lithium ion secondary battery enabling improvement of output characteristics at the time of charge and discharge at low temperature and at room temperature. A lithium ion secondary battery according to the present invention for achieving the above object includes a positive electrode plate () including a positive electrode mix layer, and a negative electrode plate () including a negative electrode mix layer (). The negative electrode mix layer () contains a graphite-type material (), metal oxide (), and a conductive assistant (). The conductive assistant () is a carbon material that does not dope or dedope lithium ions, and a mixing ratio of the conductive assistant () is 0.4 weight % or more and less than 1.2 weight % of weight of the negative electrode mix layer ().