US 12,080,872 B2
Positive electrode active material and battery comprising the same
Ryuichi Natsui, Osaka (JP); and Kensuke Nakura, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Nov. 9, 2020, as Appl. No. 17/093,552.
Application 17/093,552 is a continuation of application No. PCT/JP2019/011624, filed on Mar. 20, 2019.
Claims priority of application No. 2018-104169 (JP), filed on May 31, 2018.
Prior Publication US 2021/0074997 A1, Mar. 11, 2021
Int. Cl. H01M 4/131 (2010.01); C01G 53/00 (2006.01); H01M 4/134 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/131 (2013.01) [C01G 53/50 (2013.01); H01M 4/134 (2013.01); H01M 4/364 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2002/74 (2013.01); H01M 2004/028 (2013.01)] 27 Claims
 
1. A positive electrode active material comprising:
a lithium composite oxide, wherein
the lithium composite oxide is a multiphase mixture including:
a first phase having a crystal structure belonging to a monoclinic crystal;
a second phase having a crystal structure belonging to a hexagonal crystal; and
a third phase having a crystal structure belonging to a cubic crystal,
the positive electrode active material satisfies the following mathematical expression (I):
0.08≤ integrated intensity ratio I(20°-23°)/I(18°-20°)≤0.25, where
the integrated intensity ratio II(20°-23°)/I(18°-20°) is equal to a ratio of an integrated intensity I(20°-23°) to an integrated intensity I(18°-20°),
the integrated intensity I(18°-20°) is an integrated intensity of a first maximum peak present in a diffraction angle 2θ range of greater than or equal to 18° and less than or equal to 20° in an X-ray diffraction pattern of the lithium composite oxide, and
the integrated intensity I(20°-23°) is an integrated intensity of a second maximum peak present in a diffraction angle 2θ range of greater than or equal to 20° and less than or equal to 23° in the X-ray diffraction pattern of the lithium composite oxide, and
the positive electrode active material satisfies the following mathematical expression (II):
0.81≤ integrated intensity ratio I(18°-20°)/I(43°-46°)≤1.26,
where, the integrated intensity ratio I(18°-20°)/I(43°-46°)is equal to a ratio of an integrated intensity I(18°-20°) to an integrated intensity I(43°-46°),
the integrated intensity I(18°-20°) is an integrated intensity of a first maximum peak present in a diffraction angle 2θ range of greater than or equal to 18° and less than or equal to 20° in the X-ray diffraction pattern of the lithium composite oxide, and
the integrated intensity I(43°-46°) is an integrated intensity of a third maximum peak present in a diffraction angle 2θ range of greater than or equal to 43° and less than or equal to 46° in the X-ray diffraction pattern of the lithium composite oxide.