US 11,811,059 B2
Nonaqueous electrolyte secondary battery
Masahiro Kinoshita, Tokushima (JP); and Kaoru Nagata, Osaka (JP)
Assigned to PANASONIC ENERGY CO., LTD., Osaka (JP)
Appl. No. 16/979,373
Filed by SANYO Electric Co., Ltd., Daito (JP)
PCT Filed Feb. 7, 2019, PCT No. PCT/JP2019/004360
§ 371(c)(1), (2) Date Sep. 9, 2020,
PCT Pub. No. WO2019/176389, PCT Pub. Date Sep. 19, 2019.
Claims priority of application No. 2018-045649 (JP), filed on Mar. 13, 2018.
Prior Publication US 2020/0411860 A1, Dec. 31, 2020
Int. Cl. H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 10/0568 (2010.01); H01M 10/0569 (2010.01)
CPC H01M 4/525 (2013.01) [H01M 10/0525 (2013.01); H01M 10/0568 (2013.01); H01M 10/0569 (2013.01); H01M 2300/004 (2013.01); H01M 2300/0034 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A nonaqueous electrolyte secondary battery comprising: a positive electrode containing one or more positive electrode active materials; a negative electrode; and a nonaqueous electrolyte containing a fluorine compound, wherein:
the positive electrode active materials include a complex oxide A containing Li, Ni, and W and a complex oxide B containing Li, Ni, and W as an optional element;
W content in the complex oxide A is 5 mol % or more;
W content in the complex oxide B is 0.5 mol % or less; and
a mass ratio of the complex oxide A is 0.002% or more and 0.1% or less relative to the total of the complex oxide A and the complex oxide B.