US 12,002,925 B2
Solid-state secondary battery
Taisuke Masuko, Tokyo (JP); and Kazumasa Tanaka, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Appl. No. 17/431,549
Filed by TDK CORPORATION, Tokyo (JP)
PCT Filed Mar. 6, 2020, PCT No. PCT/JP2020/009833
§ 371(c)(1), (2) Date Aug. 17, 2021,
PCT Pub. No. WO2020/184476, PCT Pub. Date Sep. 17, 2020.
Claims priority of application No. 2019-043162 (JP), filed on Mar. 8, 2019; and application No. 2019-043163 (JP), filed on Mar. 8, 2019.
Prior Publication US 2022/0140386 A1, May 5, 2022
Int. Cl. H01M 10/0562 (2010.01); H01M 10/04 (2006.01); H01M 10/0585 (2010.01)
CPC H01M 10/0562 (2013.01) [H01M 10/0463 (2013.01); H01M 10/0585 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A solid-state secondary battery comprising:
a positive electrode layer including a positive electrode current collector layer and a positive electrode active material layer;
a negative electrode layer including a negative electrode current collector layer and a negative electrode active material layer;
a solid-state electrolyte layer including a solid-state electrolyte; and
side margin layers arranged side by side on outer circumferences of the positive electrode layer and the negative electrode layer,
wherein the solid-state secondary battery is made of a laminated body obtained by alternately laminating the positive electrode layer of which the side margin layer arranged on the outer circumference thereof and the negative electrode layer of which the side margin layer arranged on the outer circumference thereof with the solid-state electrolyte layer arranged therebetween, and
when the porosity of the side margin layers is defined as φm and the porosity of the solid-state electrolyte layer is defined as φe, a porosity ratio (φm/φe) satisfies the following Expression (1);
0.5≤(φm/φe)<1.0  (1).