US 12,224,398 B2
All-solid-state sodium ion secondary battery
Hideo Yamauchi, Otsu (JP)
Assigned to NIPPON ELECTRIC GLASS CO., LTD., Shiga (JP)
Appl. No. 16/617,147
Filed by NIPPON ELECTRIC GLASS CO., LTD., Otsu (JP)
PCT Filed Jun. 7, 2018, PCT No. PCT/JP2018/021803
§ 371(c)(1), (2) Date Nov. 26, 2019,
PCT Pub. No. WO2019/003846, PCT Pub. Date Jan. 3, 2019.
Claims priority of application No. 2017-126402 (JP), filed on Jun. 28, 2017.
Prior Publication US 2020/0112055 A1, Apr. 9, 2020
Int. Cl. H01M 10/0562 (2010.01); H01M 10/054 (2010.01); H01M 4/02 (2006.01)
CPC H01M 10/0562 (2013.01) [H01M 10/054 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An all-solid-state sodium ion secondary battery comprising:
a solid electrolyte layer having a first principal surface and a second principal surface opposite each other and made of a sodium ion-conductive oxide;
a positive electrode layer provided on the first principal surface of the solid electrolyte layer; and
a negative electrode layer provided on the second principal surface of the solid electrolyte layer, wherein
the first principal surface has an arithmetic mean roughness Ra of 1.8 μm or more and 3.2 μm or less,
the thickness of the positive electrode layer is in a range of 10 μm to 150 μm,
the positive electrode layer contains a positive-electrode active material including sodium transition metal phosphate crystals containing Na, M (where M represents at least one transition metal element selected from Cr, Fe, Mn, Co, V, and Ni), P, and O,
the solid electrolyte layer contains at least one solid electrolyte selected from the group consisting of β-alumina, β″-alumina, and NASICON crystals, and
the negative electrode layer contains a negative-electrode active material including crystals containing at least one selected from Nb and Ti, and O, metallic crystals of at least one selected from Sn, Bi, and Sb, and alloy crystals containing at least one selected from Sn, Bi, and Sb.