公开(公告)号：US20230327079A1

公开(公告)日：2023-10-12

申请号：US18043014

申请日：2021-08-24

Applicant: NICHIA CORPORATION

Inventor： Kento ISAI ,  Kenichi KOBAYASHI ,  Kiyoto IKEBATA ,  Koichi SUMIWAKA ,  Hayato ISHIBASHI

IPC: H01M4/36 ,  H01M4/525 ,  H01M4/485 ,  H01M4/505

CPC classification number: H01M4/364 ,  H01M4/525 ,  H01M2004/028 ,  H01M4/505 ,  H01M4/485

Abstract: Provided is a positive electrode active material which inhibits a decrease in discharge capacity while improving output in a low SOC region. The positive electrode active material includes: first particles that each consist of a first lithium transition metal composite oxide, the first lithium transition metal composite oxide having a layered structure and having a ratio of a number of moles of nickel to a total number of moles of metals other than lithium in a composition thereof being 0.7 or greater and smaller than 1; second particles that have a volume average particle diameter smaller than a volume average particle diameter of the first particles, the second particles each consisting of a second lithium transition metal composite oxide having a layered structure; and third particles that each consist of a third lithium transition metal composite oxide, the third lithium transition metal composite oxide having a layered structure, having a ratio of number of moles of nickel to total number of moles of metals other than lithium in a composition thereof being 0.4 to 0.6, and having a ratio of a number of moles of cobalt to the total number of moles being 0.35 to 0.55. The first particle content is 60 mass % or higher and lower than 100 mass %, and the third particle content is 10 mass % or lower, to a total content of the first particles, the second particles, and the third particles.

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.

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：US20240021814A1

公开(公告)日：2024-01-18

申请号：US18346429

申请日：2023-07-03

Applicant: NICHIA CORPORATION

Inventor： Hayato ISHIBASHI ,  Kenichi KOBAYASHI ,  Kento ISAI ,  Kenta KAWAI ,  Koichi SUMIWAKA

IPC: H01M4/525 ,  H01M4/505 ,  C01G53/00

CPC classification number: H01M4/525 ,  H01M4/505 ,  C01G53/50 ,  H01M2004/028

Abstract: A method of manufacturing a positive electrode material for a lithium ion secondary battery includes: firing a mixture containing a lithium compound, a nickel-containing complex compound, and a molybdenum compound, to obtain first particles containing a lithium transition metal complex oxide having a composition in which a ratio of a number of moles of nickel to a total number of moles of metals other than lithium is greater than 0.6 and less than 1; and bringing the first particles into contact with a liquid medium in such that a solid content concentration of the first particles is in a range of 20 mass % to 80 mass % to remove a part of molybdenum element contained in the first particles to obtain second particles.