US 12,261,294 B2
Lithium secondary battery
Kengo Oishi, Nagoya (JP)
Assigned to NGK INSULATORS, LTD., Nagoya (JP)
Filed by NGK INSULATORS, LTD., Nagoya (JP)
Filed on Jun. 21, 2021, as Appl. No. 17/304,388.
Application 17/304,388 is a continuation of application No. PCT/JP2020/010127, filed on Mar. 9, 2020.
Claims priority of application No. 2019-084699 (JP), filed on Apr. 25, 2019.
Prior Publication US 2021/0320297 A1, Oct. 14, 2021
Int. Cl. H01M 4/525 (2010.01); H01M 4/02 (2006.01); H01M 10/0525 (2010.01); H01M 50/434 (2021.01); H01M 50/443 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01)
CPC H01M 4/525 (2013.01) [H01M 10/0525 (2013.01); H01M 50/434 (2021.01); H01M 50/443 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A lithium secondary battery comprising:
a positive electrode layer composed of a cobalt-containing lithium composite oxide sintered body;
a negative electrode layer composed of a titanium-containing sintered body;
a ceramic separator interposed between the positive electrode layer and the negative electrode layer;
an electrolytic solution impregnating at least the ceramic separator; and
an exterior body having a closed space and accommodating the positive electrode layer, the negative electrode layer, the ceramic separator, and the electrolytic solution within the closed space,
wherein the positive electrode layer, the ceramic separator, and the negative electrode layer form one integrated sintered plate as a whole, whereby the positive electrode layer, the ceramic separator, and the negative electrode layer are bonded together, and
wherein the lithium composite oxide sintered body comprises 0.05 to 2.0 mol % of boron with respect to the content of cobalt in the lithium composite oxide sintered body or 0.05 to 1.2 mol % of strontium with respect to the content of cobalt in the lithium composite oxide sintered body, as an auxiliary agent.