US 12,412,902 B2
Lithium iron complex oxide, cathode material, cathode, and lithium-ion secondary battery
Tomohiko Hasegawa, Tokyo (JP); Kosuke Sato, Tokyo (JP); Hiroki Karisyuku, Tokyo (JP); and Takashi Mori, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Appl. No. 17/913,739
Filed by TDK CORPORATION, Tokyo (JP)
PCT Filed Jan. 7, 2022, PCT No. PCT/JP2022/000359
§ 371(c)(1), (2) Date Sep. 22, 2022,
PCT Pub. No. WO2022/149611, PCT Pub. Date Jul. 14, 2022.
Claims priority of application No. 2021-002344 (JP), filed on Jan. 8, 2021; application No. 2021-002345 (JP), filed on Jan. 8, 2021; and application No. 2021-002346 (JP), filed on Jan. 8, 2021.
Prior Publication US 2023/0112744 A1, Apr. 13, 2023
Int. Cl. H01M 4/62 (2006.01); C01G 49/00 (2006.01); H01M 4/02 (2006.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/628 (2013.01) [C01G 49/0027 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2002/82 (2013.01); C01P 2002/89 (2013.01); C01P 2004/84 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A lithium iron complex oxide, wherein
the lithium iron complex oxide is represented by Li5FeO4,
two peaks with different quadrupole splitting values (QS) analyzed using 57Fe Mössbauer spectroscopy are shown,
one of the two peaks, a peak A, satisfies QS>0, and
the other one of the two peaks, a peak B, satisfies QS=0.