US Patent Issued to SUMITOMO METAL MINING on May 27 for "Positive electrode active material for lithium ion secondary battery and lithium ion secondary battery" (Japanese Inventors)

ALEXANDRIA, Va., June 17 -- United States Patent no. 12,315,924, issued on May 27, was assigned to SUMITOMO METAL MINING Co. LTD. (Tokyo).

"Positive electrode active material for lithium ion secondary battery and lithium ion secondary battery" was invented by Tetsutaro Hayashi (Niihama, Japan), Willy Shun Kai Bong (Niihama, Japan) and Toshihiro Kato (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A positive electrode active material is constituted by lithium transition metal-containing composite oxide particles having a layered rock salt type crystal structure and are composed of secondary particles each formed of an aggregation of primary particles. The secondary particles have a d50 of 3.0 to 7.0 mic...