US 12,404,173 B2
Solid electrolyte, and method for producing same
Vin-Na Jo, Daejeon (KR); Hyea-Eun Han, Daejeon (KR); Je-Yne Lyoo, Daegu (KR); and Seung-Tae Hong, Daegu (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/636,312
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Mar. 18, 2021, PCT No. PCT/KR2021/003387
§ 371(c)(1), (2) Date Feb. 17, 2022,
PCT Pub. No. WO2021/201471, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 10-2020-0039967 (KR), filed on Apr. 1, 2020.
Prior Publication US 2022/0289569 A1, Sep. 15, 2022
Int. Cl. H01M 10/052 (2010.01); C01B 17/40 (2006.01); C01B 25/14 (2006.01); H01B 1/10 (2006.01); H01M 10/0562 (2010.01)
CPC C01B 17/40 (2013.01) [H01M 10/052 (2013.01); H01M 10/0562 (2013.01); C01P 2002/74 (2013.01); C01P 2002/76 (2013.01); C01P 2002/77 (2013.01); C01P 2006/40 (2013.01); H01M 2300/0068 (2013.01); H01M 2300/0091 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A sulfide-based solid electrolyte comprising a compound represented by the following Chemical Formula 1 or Chemical Formula 2:
LixZnyPzS6  [Chemical Formula 1]
wherein 1≤x≤4, 0<y≤2, and 0<z≤3;
Li2+2kZn1−kP2S6  [Chemical Formula 2]
wherein 0≤k<1;
wherein the compound has a crystal structure satisfying the following conditions (a)-(c):
(a) a space group that belongs to P31m (No. 162);
(b) unit cell parameters of a=6.03±0.5 Å and c=6.59±0.5 Å; and
(c) crystallographic coordinates of cations occupying 2c, 2d and 2e coordinates in a unit cell with a site occupancy of each coordinate of larger than 0 and equal to or less than 1, and a crystallographic coordinate of anions occupying 6k coordinate in a unit cell with a site occupancy of 6k of larger than 0 and equal to or less than 1, wherein each of the coordinates represents the following:
2c (⅓, ⅔, 0);
2d (⅓, ⅔, ½);
2e (0, 0, z), wherein 0.30≤z≤0.33; and
6k (x, 0, z), wherein 0.325≤x≤0.35 and 0.23≤z≤0.28.