US 12,388,082 B2
Positive electrode active material for non-aqueous electrolyte secondary battery and method for producing same
Miki Mizawa, Hyogo (JP); Kaoru Nagata, Osaka (JP); Masanori Maekawa, Osaka (JP); and Masahiro Kinoshita, Osaka (JP)
Assigned to PANASONIC HOLDINGS CORPORATION, Osaka (JP); and PANASONIC ENERGY CO., LTD., Osaka (JP)
Filed by PANASONIC HOLDINGS CORPORATION, Kadoma (JP); and SANYO Electric Co., Ltd., Kadoma (JP)
Filed on Apr. 11, 2023, as Appl. No. 18/133,232.
Application 18/133,232 is a continuation of application No. 16/577,022, filed on Sep. 20, 2019, granted, now 11,658,295.
Application 16/577,022 is a continuation of application No. PCT/JP2018/004972, filed on Feb. 14, 2018.
Claims priority of application No. 2017-070700 (JP), filed on Mar. 31, 2017.
Prior Publication US 2023/0282817 A1, Sep. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/00 (2006.01); H01M 4/36 (2006.01); H01M 4/485 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/485 (2013.01) [H01M 4/366 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A positive electrode active material for a non-aqueous electrolyte secondary battery, including a nickel-containing lithium transition metal oxide, wherein
a proportion of Ni in the nickel-containing lithium transition metal oxide being not less than 80 mol %,
a peak of 1560 to 1565 eV in binding energy from an Al-rich layer exists in hard X-ray photoelectron spectroscopy (HAXPES) at a photon energy of 6 KeV, and when lithium transition metal oxide particles have an average particle diameter of r, an Al concentration is approximately constant within a range of 0.35r from the center,
wherein the Al-rich layer contains LiAlO2,
wherein the Al-rich layer has a thickness of 100 nm or less,
wherein aluminum is dissolved to form a solid solution inside the lithium transition metal oxide particles, and
wherein the Al-rich layer is a mixed body of LiAlO2 and an oxide containing Li, Ni, Co, and Al.