US 12,170,369 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 Apr. 26, 2022, as Appl. No. 17/729,170.
Application 17/729,170 is a continuation 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 2022/0255076 A1, Aug. 11, 2022
Int. Cl. H01B 1/08 (2006.01); C01G 53/00 (2006.01); 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)] 49 Claims
OG exemplary drawing
 
1. A method for manufacturing a lithium-ion secondary battery comprising a positive electrode, a negative electrode, and an electrolyte, the positive electrode comprising a positive electrode active material, the positive electrode active material comprising a positive electrode active material particle, the method comprising the steps of:
mixing a lithium source, a cobalt source, a magnesium source, and a fluorine source to form a mixture;
performing a first heating on the mixture to form a composite oxide; and
performing a second heating on the composite oxide so that magnesium of the magnesium source is segregated at a surface portion of the positive electrode active material particle,
wherein a temperature of the second heating is lower than a temperature of the first heating, and
wherein the mixture comprises a magnesium compound and a compound comprising lithium and fluorine.