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:
Apr. 16, 2019
Filed:
Jun. 14, 2017
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi, JP;
Hideyuki Saka, Toyota, JP;
Yukihiro Okada, Shijyounawate, JP;
Keiichi Takahashi, Nishinomiya, JP;
Kaoru Inoue, Hirakata, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, Aichi, JP;
Abstract
Provided is a lithium ion secondary battery which has a low internal resistance in a low-SOC region and a sufficiently large amount of gas generated during overcharge. The lithium ion secondary battery disclosed herein includes an electrode body having a positive electrode and a negative electrode, and a nonaqueous electrolytic solution. The lithium ion secondary battery further includes a pressure-type safety mechanism. The nonaqueous electrolytic solution includes a gas generating agent. The positive electrode has a positive electrode active material layer including a positive electrode active material. The positive electrode active material includes a lithium transition metal composite oxide represented by LiNiCoMnOwherein a, b and c satisfy the following conditions: 0.35≤a≤0.45, 0.15≤b≤0.25, 0.35≤c≤0.45, and a+b+c=1, and a lithium transition metal composite oxide represented by LiNiCoMnOwherein x, y and z satisfy the following conditions: 0.35≤x≤0.45, 0.45≤y≤0.55, 0.05≤z≤0.15, and x+y+z=1, and the mass ratio of the oxides is 60:40 to 85:15.