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:
Mar. 02, 2021
Filed:
May. 27, 2015
Sumitomo Chemical Company, Limited, Tokyo, JP;
Tanaka Chemical Corporation, Fukui, JP;
Hiroyuki Kurita, Tsukuba, JP;
Kenji Takamori, Tsukuba, JP;
Yuichiro Imanari, Tsukuba, JP;
Takaaki Masukawa, Fukui, JP;
Daisuke Yamashita, Fukui, JP;
Kimiyasu Nakao, Fukui, JP;
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
TANAKA CHEMICAL CORPORATION, Fuku, JP;
Abstract
The object of the present invention is to provide a positive electrode active material usable for a lithium ion battery capable of high charge/discharge cycle performance and high discharge capacity. The positive electrode active material for a lithium secondary battery has a layered structure and comprises at least nickel, cobalt and manganese. Further, the positive electrode active material satisfies requirements (1) to (3) below: (1) a primary particle size of 0.1 μm to 1 μm, and a 50% cumulative particle size Dof 1 μm to 10 μm, (2) a ratio (D/D) of volume-based 90% cumulative particle size Dto volume-based 10% cumulative particle size Dof 2 to 6, and (3) a lithium carbonate content in a residual alkali on particle surfaces of 0.1% by mass to 0.8% by mass as measured by neutralization titration.