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. 18, 2017
Filed:
Mar. 10, 2014
Hitachi, Ltd., Tokyo, JP;
Yusuke Asari, Tokyo, JP;
HITACHI, LTD., Tokyo, JP;
Abstract
Provided is a positive electrode active material for lithium ion secondary batteries, having a crystal structure containing a layered LiMnOstructure with a high theoretical electrical capacity as a basic skeleton, and having both a high theoretical electrical capacity and a high open-circuit voltage by increasing an open-circuit voltage to a value of more than 2 V by replacing a part of manganese ions with calcium ions by adding the calcium ions. That is, a positive electrode active material for secondary batteries mainly containing a compound represented by a chemical composition formula LiMnCaO, and an electrode and a battery including the same are realized. In the formula, x satisfies 0<x<1.3, and y satisfies 0.2<y<0.9.