公开(公告)号：US20230085645A1

公开(公告)日：2023-03-23

申请号：US17759422

申请日：2021-01-26

Applicant: NICHIA CORPORATION

Inventor： Masato SONOO ,  Hideaki HAMADA ,  Kenichi KOBAYASHI ,  Jota MORIMOTO

IPC: H01M4/04 ,  H01M4/485 ,  H01M4/525

Abstract: Provided is a positive electrode active material for a non-aqueous electrolyte secondary battery. Also provided is a method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery, comprising: providing a lithium transition metal composite oxide having a ratio D50/DSEM of 1 or more and 4 or less, 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 of 0.3 or more and less than 1, and a ratio of a number of moles of cobalt to the total number of moles of metals other than lithium of 0 or more and less than 0.5; bringing the lithium transition metal composite oxide into contact with a cobalt compound to obtain an adhered material; and heat-treating the adhered material at a temperature higher than 700° C. and lower than 1100° C.

公开(公告)号：US20230045181A1

公开(公告)日：2023-02-09

申请号：US17814814

申请日：2022-07-25

Applicant: NICHIA CORPORATION

Inventor： Masato SONOO ,  Masahiro MURAYAMA ,  Kenichi KOBAYASHI ,  Hideaki HAMADA ,  Jota MORIMOTO

IPC: H01M4/525 ,  H01M4/36 ,  H01M4/505 ,  H01M4/131 ,  H01M4/04

Abstract: A method of producing a positive electrode for a non-aqueous electrolyte secondary battery, includes: providing a lithium transition metal composite oxide having a layered structure, having a ratio D50/DSEM of 1 or more and 4 or less, and having a certain content of nickel and a certain content of cobalt; bringing the lithium transition metal composite oxide into contact with a cobalt compound to obtain an adhered material; heat-treating the adhered material at a temperature higher than 700° C. and lower than 1100° C. to obtain a heat-treated product; obtaining a positive electrode composition containing the heat-treated product, a conductive auxiliary agent, and a binder; and applying and pressurizing the positive electrode composition onto a collector to form an active material layer having a density of 2.7 g/cm3 or more and 3.9 g/cm3 or less on the collector.