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:
Dec. 31, 2019
Filed:
Nov. 20, 2014
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
Haruki Kaneda, Niihama, JP;
Hiroko Oshita, Niihama, JP;
Masanori Takagi, Niihama, JP;
Ryozo Ushio, Niihama, JP;
SUMITOMO METAL MINING CO., LTD., Tokyo, JP;
Abstract
Provided is a method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries that achieves both high thermal stability and high charge/discharge capacity and has excellent cycle characteristics and an easy and safe production method thereof, and a nonaqueous electrolyte secondary battery using the positive electrode active material. A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries includes a crystallization step of adding an alkaline aqueous solution to a mixed aqueous solution containing at least nickel and cobalt for crystallization to obtain a nickel-containing hydroxide represented by a general formula NiCOM(OH), a mixing step of mixing the obtained nickel-containing hydroxide, a lithium compound, and a niobium compound to obtain a lithium mixture, and a firing step of firing the lithium mixture in an oxidative atmosphere at 700 to 840° C. to obtain a lithium-transition metal composite oxide.