US 11,056,723 B2
Nonaqueous electrolyte secondary battery
Takayuki Shirane, Osaka (JP); and Takanobu Chiga, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Jan. 2, 2018, as Appl. No. 15/859,856.
Application 15/859,856 is a continuation of application No. PCT/JP2016/003660, filed on Aug. 9, 2016.
Claims priority of application No. JP2015-175925 (JP), filed on Sep. 7, 2015.
Prior Publication US 2018/0123173 A1, May 3, 2018
Int. Cl. H01M 10/0587 (2010.01); H01M 10/0525 (2010.01); H01M 4/587 (2010.01); H01M 10/44 (2006.01); H01M 10/04 (2006.01); H01M 4/525 (2010.01); H01M 10/0569 (2010.01); H01M 4/131 (2010.01); H01M 4/133 (2010.01)
CPC H01M 10/0587 (2013.01) [H01M 4/525 (2013.01); H01M 4/587 (2013.01); H01M 10/0431 (2013.01); H01M 10/0525 (2013.01); H01M 10/0569 (2013.01); H01M 10/446 (2013.01); H01M 4/131 (2013.01); H01M 4/133 (2013.01); H01M 2220/20 (2013.01); H01M 2300/004 (2013.01); Y02E 60/10 (2013.01); Y02T 10/70 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte, wherein
the negative electrode includes an opposing region that opposes the positive electrode with the separator disposed therebetween and a non-opposing region that does not oppose the positive electrode but opposes the separator, and
configured such that a discharge cut-off voltage of the nonaqueous electrolyte secondary battery is in a range of 2.5 V to 3.0 V, and a part of the non-opposing region adjacent to a boundary between the opposing region and the non-opposing region has an electric potential plateau in a range of −0.02 V to +0.02 V relative to a negative electrode potential in the opposing region,
wherein the part of the non-opposing region adjacent to the boundary is a region that extends toward the non-opposing region from the boundary by 1 mm to 2 mm, and
the non-opposed region comprises lithium.