US 12,334,555 B2
Non-aqueous electrolyte secondary battery
Masakazu Togo, Osaka (JP); Yoshinori Aoki, Osaka (JP); and Takeshi Ogasawara, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/777,475
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Sep. 17, 2020, PCT No. PCT/JP2020/035248
§ 371(c)(1), (2) Date May 17, 2022,
PCT Pub. No. WO2021/100305, PCT Pub. Date May 27, 2021.
Claims priority of application No. 2019-208846 (JP), filed on Nov. 19, 2019.
Prior Publication US 2022/0407062 A1, Dec. 22, 2022
Int. Cl. H01M 4/525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A non-aqueous electrolyte secondary battery comprising:
a positive electrode including a positive electrode active material;
a negative electrode including a negative electrode active material; and
a non-aqueous electrolyte, wherein
the positive electrode active material includes a lithium transition metal oxide having a layered structure including a Li layer in which Li reversibly moves in and out, and including at least Ni, Ca and Al;
in the lithium transition metal oxide,
a content of Ni is 80 mol % or more and 95 mol % or less relative to a total amount of metal elements excluding Li;
a content of Ca is more than 0 mol % and 3 mol % or less relative to the total amount of metal elements excluding Li;
a content of Al is more than 0 mol % and 8 mol % or less relative to the total amount of metal elements excluding Li;
a proportion of metal elements excluding Li present in the Li layer is 0.6 mol % or more and 2.0 mol % or less with respect to a total number of moles of metal elements excluding Li included in the lithium transition metal oxide;
the negative electrode active material comprises a film including Ca on a surface thereof; and
a proportion of Ca in the film is 15 ppm by mass or more and less than 80 ppm by mass relative to a total mass of the positive electrode active material.