公开(公告)号：US20250038202A1

公开(公告)日：2025-01-30

申请号：US18784821

申请日：2024-07-25

Applicant: NICHIA CORPORATION

Inventor： Shigenobu NODA ,  Shunsuke SAWADA ,  Takashi ENOMOTO ,  Satoshi MATSUSHITA ,  Hideyuki KIRIE ,  Misaki KAWAI ,  Kento ISAI ,  Kenichi KOBAYASHI

IPC: H01M4/58 ,  C01B25/45 ,  H01M4/02

Abstract: A method of producing a cathode active material for a secondary battery is provided. The method includes preparing a mixture comprising a lithium source, a phosphate source, an iron source, a carbon source, a boron source comprising an oxo acid of boron, and a liquid medium; granulating the mixture to obtain a precursor; and heat-treating the precursor to obtain a lithium transition metal compound having an olivine structure, wherein in the mixture, a total molar amount of boron atoms contained in the boron source is more than 0% and less than 3% with respect to a total molar amount of iron atoms contained in the iron source as 100%.

公开(公告)号：US20240429373A1

公开(公告)日：2024-12-26

申请号：US18708203

申请日：2022-10-31

Applicant: NICHIA CORPORATION

Inventor： Shigenobu NODA ,  Takashi ENOMOTO ,  Hideyuki KIRIE ,  Kento ISAI ,  Kenichi KOBAYASHI

IPC: H01M4/36 ,  C01B25/45 ,  H01M4/02 ,  H01M4/58 ,  H01M4/583

Abstract: Provided is a cathode material that can further improve the high-rate performance in a lithium ion secondary battery. The cathode material inculeds secondary particles comprising: primary particles containing a lithium transition metal compound having an olivine structure; and carbon adhering to the surfaces of the primary particles, a plurality of which primary particles are aggregated. The content of the carbon is more than 0.5% by mass and 1.8% by mass or less with respect to the cathode material. The lithium transition metal compound has a crystallite size that is 50 nm to 70 nm. The cathode material has a specific surface area that is 14 m2/g to 45 m2/g.