US 11,984,605 B2
Lithium secondary battery
Masahiko Hibino, Nagoya (JP); Takayuki Kondo, Nagoya (JP); and Tetsushige Yoshida, Nagoya (JP)
Assigned to NGK INSULATORS, LTD., Nagoya (JP)
Filed by NGK INSULATORS, LTD., Nagoya (JP)
Filed on Sep. 14, 2020, as Appl. No. 17/019,878.
Application 17/019,878 is a continuation of application No. PCT/JP2019/007649, filed on Feb. 27, 2019.
Claims priority of application No. 2018-060047 (JP), filed on Mar. 27, 2018.
Prior Publication US 2021/0005896 A1, Jan. 7, 2021
Int. Cl. H01M 50/136 (2021.01); H01M 4/66 (2006.01); H01M 10/0525 (2010.01); H01M 10/0585 (2010.01); H01M 50/105 (2021.01); H01M 4/02 (2006.01); H01M 50/119 (2021.01); H01M 50/121 (2021.01); H01M 50/124 (2021.01)
CPC H01M 4/667 (2013.01) [H01M 4/664 (2013.01); H01M 10/0525 (2013.01); H01M 10/0585 (2013.01); H01M 50/105 (2021.01); H01M 50/136 (2021.01); H01M 2004/028 (2013.01); H01M 50/119 (2021.01); H01M 50/121 (2021.01); H01M 50/124 (2021.01)] 8 Claims
OG exemplary drawing
 
1. A thin lithium secondary battery comprising:
a positive electrode;
a negative electrode; and
an electrolyte existing between said positive electrode and said negative electrode,
wherein at least one of said positive electrode and said negative electrode includes:
a sheet-like current collector having conductivity; and
an active material plate that is a plate-like ceramic sintered compact joined to said current collector via a conductive joint layer,
said active material plate includes at least one active material plate element joined to said current collector, and
a main surface of each active material plate element that opposes said current collector includes:
a joint region in which said conductive joint layer exists directly in contact with a portion between said current collector and the active material plate element; and
a non-joint region that is arranged around said joint region and in which said conductive joint layer does not exist directly in contact with a portion between said current collector and the active material plate element, and
wherein said non-joint region has an area that is 64% or more and 570% or less of an area of said joint region.