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：US20240243274A1

公开(公告)日：2024-07-18

申请号：US18411642

申请日：2024-01-12

Applicant: NICHIA CORPORATION

Inventor： Sota SEKIGUCHI ,  Masahiro MURAYAMA ,  Rina OZAKI ,  Satoshi MATSUSHITA

IPC: H01M4/525 ,  H01M4/04 ,  H01M4/36 ,  H01M4/48 ,  H01M4/02

CPC classification number: H01M4/525 ,  H01M4/0404 ,  H01M4/366 ,  H01M4/48 ,  H01M2004/021 ,  H01M2004/028

Abstract: Provided is a method for producing a positive electrode for a nonaqueous electrolyte secondary battery, the method including obtaining a positive electrode active material having a volume-average particle size in a range of 1 m to 8 m and a specific surface area that is 1.4 m2/g or more from: particles containing a lithium transition metal composite oxide; and an aluminum compound having a volume-average particle size in a range of 1 nm to less than 500 nm, and obtaining a positive electrode active material layer by dispersing the positive electrode active material, a conduction aid, and a binder in a solvent to obtain a dispersion, applying the dispersion to the current collector, drying the dispersion, and subsequently compression-molding the dispersion and the current collector to have a density in a range of more than 2.6 g/cm3 and less than 2.8 g/cm3.