US 12,015,139 B2
Non-aqueous electrolyte secondary battery
Syunsuke Natsumeda, Osaka (JP); Takuya Shinomiya, Osaka (JP); Takamitsu Tashita, Tokushima (JP); and Fumikazu Mizukoshi, Osaka (JP)
Assigned to PANASONIC ENERGY CO., LTD., Osaka (JP); and PANASONIC HOLDINGS CORPORATION, Kadoma (JP)
Appl. No. 17/430,362
Filed by SANYO Electric Co., Ltd., Daito (JP); and Panasonic Corporation, Kadoma (JP)
PCT Filed Feb. 21, 2020, PCT No. PCT/JP2020/007024
§ 371(c)(1), (2) Date Aug. 12, 2021,
PCT Pub. No. WO2020/175361, PCT Pub. Date Sep. 3, 2020.
Claims priority of application No. 2019-035843 (JP), filed on Feb. 28, 2019.
Prior Publication US 2022/0131131 A1, Apr. 28, 2022
Int. Cl. H01M 4/133 (2010.01); H01M 4/02 (2006.01); H01M 4/134 (2010.01); H01M 4/1393 (2010.01); H01M 4/36 (2006.01); H01M 4/38 (2006.01); H01M 4/587 (2010.01); H01M 4/62 (2006.01)
CPC H01M 4/133 (2013.01) [H01M 4/134 (2013.01); H01M 4/386 (2013.01); H01M 4/587 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 4/1393 (2013.01); H01M 4/366 (2013.01); H01M 4/625 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A non-aqueous electrolyte secondary battery comprising:
a negative electrode including a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector; wherein
the negative electrode active material layer includes graphite particles A and graphite particles B each as a negative electrode active material,
the graphite particles A have an internal porosity of 8% to 20% and the graphite particles B have an internal porosity of 5% or less, and
the graphite particles A are more included in a half second region on an outer surface side than in a half first region on a negative electrode current collector side in the case of bisection of the negative electrode active material layer in a thickness direction.