US 12,327,867 B2
Positive electrode active material, method for manufacturing positive electrode active material, and secondary battery
Mayumi Mikami, Kanagawa (JP); Aya Uchida, Tochigi (JP); Yumiko Yoneda, Kanagawa (JP); Yohei Momma, Kanagawa (JP); Masahiro Takahashi, Kanagawa (JP); and Teruaki Ochiai, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., Atsugi (JP)
Filed by SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Atsugi (JP)
Filed on May 23, 2022, as Appl. No. 17/750,436.
Application 17/750,436 is a division of application No. 16/611,791, previously published as PCT/IB2018/053274, filed on May 11, 2018.
Claims priority of application No. 2017-099871 (JP), filed on May 19, 2017.
Prior Publication US 2022/0285681 A1, Sep. 8, 2022
Int. Cl. H01B 1/08 (2006.01); C01G 53/50 (2025.01); H01M 4/131 (2010.01); H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/139 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 6/16 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [C01G 53/50 (2013.01); H01B 1/08 (2013.01); H01M 4/131 (2013.01); H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/139 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 6/164 (2013.01); H01M 10/0525 (2013.01); C01P 2002/74 (2013.01); H01M 2004/028 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A lithium ion secondary battery comprising a positive electrode, a negative electrode, and an electrolyte solution:
wherein:
the positive electrode comprises a positive electrode active material comprising a positive electrode active material particle, the positive electrode active material particle comprising lithium cobalt oxide, magnesium, and aluminum,
a magnesium concentration in a surface portion of the positive electrode active material particle is higher than a magnesium concentration in an inner portion of the positive electrode active material particle,
in an EDX linear analysis of the positive electrode active material particle, a concentration peak of aluminum is located in a deeper region than a concentration peak of magnesium,
the positive electrode active material has an O3 crystal structure when a charge depth of the positive electrode active material is 0.06 or less,
an X-ray diffraction pattern of the positive electrode active material has at least a first diffraction peak at 2θ of 19.30+0.20° and a second diffraction peak at 2θ of 45.55=0.10° when the positive electrode is analyzed by powder X-ray diffraction by using CuKal ray, when a battery comprising the positive electrode and a counter electrode of lithium is charged at 4.6V, and
the electrolyte solution comprises vinylene carbonate.