US 11,923,502 B2
All-solid secondary battery and method of preparing same
Junhwan Ku, Seongnam-si (KR); and Toshinori Sugimoto, Hwaseong-si (KR)
Assigned to SAMSUNG SDI CO., LTD., Gyeonggi-do (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Jul. 13, 2020, as Appl. No. 16/927,097.
Claims priority of application No. 10-2020-0012188 (KR), filed on Jan. 31, 2020.
Prior Publication US 2021/0242490 A1, Aug. 5, 2021
Int. Cl. H01M 10/0562 (2010.01); H01M 4/40 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/62 (2006.01); H01M 4/66 (2006.01)
CPC H01M 10/0562 (2013.01) [H01M 4/405 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/623 (2013.01); H01M 4/661 (2013.01); H01M 4/663 (2013.01); H01M 2300/008 (2013.01)] 33 Claims
OG exemplary drawing
 
1. An all-solid secondary battery comprising:
a solid electrolyte layer disposed between an anode layer and a cathode layer, wherein the solid electrolyte layer comprises
a first solid electrolyte layer comprising a first solid electrolyte, and
a second solid electrolyte layer comprising a second solid electrolyte, wherein
the first solid electrolyte layer is disposed directly on the anode layer,
the second solid electrolyte layer is disposed directly on the cathode layer, and
the first solid electrolyte has a lithium ion conductivity which is greater than a lithium ion conductivity of the second solid electrolyte, and
a difference between the lithium ion conductivity of the first solid electrolyte and the lithium ion conductivity of the second solid electrolyte is equal to or greater than about 2 millisiemens per centimeter,
wherein the first solid electrolyte and the second solid electrolyte each independently has an argyrodite crystal structure represented by Formula 1,
LiaMxPSbXcCld  Formula 1
wherein, in Formula 1,
M is Na, K, Fe, Mg, Ca, Ag, Cu, Zr, Zn, or a combination thereof;
X is Br, I, or a combination thereof; and
0≤x≤0.07, 5≤a≤6, 4≤b≤6, c>0, d>0, 0<(c+d)≤2, and 5≤(a+x)≤6.