US 12,170,374 B2
Secondary battery
Daisuke Hasegawa, Aomori (JP); Kazuyuki Tsunokuni, Tokyo (JP); Tomokazu Saito, Aomori (JP); and Taku Higuti, Aomori (JP)
Assigned to Kabushiki Kaisha Nihon Micronics, Musashino (JP)
Filed by Kabushiki Kaisha Nihon Micronics, Tokyo (JP)
Filed on Jul. 23, 2021, as Appl. No. 17/384,669.
Application 17/384,669 is a continuation of application No. PCT/JP2020/001464, filed on Jan. 17, 2020.
Claims priority of application No. 2019-015214 (JP), filed on Jan. 31, 2019.
Prior Publication US 2021/0351412 A1, Nov. 11, 2021
Int. Cl. H01M 4/62 (2006.01); H01M 4/48 (2010.01); H01M 4/52 (2010.01); H01M 10/0562 (2010.01)
CPC H01M 4/628 (2013.01) [H01M 4/483 (2013.01); H01M 4/523 (2013.01); H01M 10/0562 (2013.01); H01M 2300/0071 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
a solid electrolyte layer containing a tantalum oxide as a solid electrolyte;
a positive-electrode active material layer disposed on an upper surface of the solid electrolyte layer, the positive-electrode active material layer containing nickel hydroxide (Ni(OH)2) as a positive-electrode active material;
a negative-electrode active material layer disposed on a lower surface of the solid electrolyte layer so as to be opposite to the positive-electrode active material layer, the negative-electrode active material layer containing a titanium oxide or containing a titanium oxide and a silicon oxide as a negative-electrode active material; and
a buffer layer for improving an interface formed between the positive-electrode active material layer and the solid electrolyte layer or between the negative-electrode active material layer and the solid electrolyte layer, wherein the buffer layer contains a metal oxide selected from the group consisting of a tin oxide (SnO), aluminum oxide (Al2O3), zirconia (ZrO2), and magnesium oxide (MgO);
wherein the titanium oxide comprises a micro crystalline structure.