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. 10, 2018
Filed:
Nov. 18, 2014
Ngk Insulators, Ltd., Nagoya-Shi, JP;
Nobuyuki Kobayashi, Nagoya, JP;
Yukinobu Yura, Nagoya, JP;
Shohei Yokoyama, Nagoya, JP;
Kei Sato, Nagoya, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
There is provided a positive electrode active material capable of achieving a high volume energy density and yet superior rate characteristics when configured as a positive electrode for lithium secondary batteries. This positive electrode active material comprises a plurality of secondary particles each comprising primary particles composed of a lithium-nickel based complex oxide having a layered rock-salt structure. The plurality of secondary particles have a volume-based average particle diameter D50 of 5 to 100 μm, and at least part of the plurality of secondary particles are coarse secondary particles having a particle diameter of 9 μm or greater. The coarse secondary particles have a voidage of 5 to 25%, and the ratio of through holes among all voids in the coarse secondary particles is 70% or greater.