US 12,068,479 B2
Winding-type nonaqueous electrolyte secondary battery
Shigeki Moriya, Osaka (JP); Nobuhiro Sakitani, Tokushima (JP); and Takaharu Morikawa, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/430,878
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Feb. 14, 2020, PCT No. PCT/JP2020/005707
§ 371(c)(1), (2) Date Aug. 13, 2021,
PCT Pub. No. WO2020/175172, PCT Pub. Date Sep. 3, 2020.
Claims priority of application No. 2019-034268 (JP), filed on Feb. 27, 2019.
Prior Publication US 2022/0037661 A1, Feb. 3, 2022
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/525 (2010.01); H01M 4/62 (2006.01); H01M 4/66 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/366 (2013.01); H01M 4/625 (2013.01); H01M 4/662 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 4/364 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A winding-type non-aqueous electrolyte secondary battery, comprising:
an electrode assembly having a positive electrode and a negative electrode wound with separators intervening therebetween; and
a non-aqueous electrolyte, wherein
at least one of the positive electrode and the negative electrode comprises:
a current collector; a mixture layer on an inner periphery side that is arranged on a surface of the current collector that is on the inner periphery side; and a mixture layer on an outer periphery side that is arranged on a surface of the current collector that is on the outer periphery side,
the mixture layer on the inner periphery side and the mixture layer on the outer periphery side include active material and carbon nanotubes, and
the carbon nanotubes of the mixture layer on the outer periphery side have a larger average fiber length than the carbon nanotubes of the mixture layer on the inner periphery side and have 5 μm to 30 μm of average fiber length.