US 11,955,601 B2
Sulfide solid electrolyte for all-solid secondary battery, method of preparing same, and all-solid secondary battery including the same
Dongrak Sohn, Yongin-si (KR); Minsang Song, Yongin-si (KR); Jungmin Han, Yongin-si (KR); Younggyoon Ryu, Yongin-si (KR); Kyulin Lee, Yongin-si (KR); Jeongdoo Yi, Yongin-si (KR); Sangil Han, Yongin-si (KR); Keesun Sohn, Yongin-si (KR); Sunggeun Shim, Yongin-si (KR); and Jinhee Lee, Yongin-si (KR)
Assigned to SAMSUNG SDI CO., LTD., Yongin-si (KR); and INDUSTRY-ACADEMIA COOPERATION GROUP OF SEJONG UNIVERSITY, Yongin-si (KR)
Filed by SAMSUNG SDI CO., LTD., Yongin-si (KR); and INDUSTRY-ACADEMIA COOPERATION GROUP OF SEJONG UNIVERSITY, Seoul (KR)
Filed on Aug. 26, 2021, as Appl. No. 17/412,589.
Claims priority of application No. 10-2020-0110596 (KR), filed on Aug. 31, 2020.
Prior Publication US 2022/0069343 A1, Mar. 3, 2022
Int. Cl. H01M 10/0562 (2010.01); C01B 17/22 (2006.01); H01M 4/36 (2006.01); H01M 4/38 (2006.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01); H01M 10/0585 (2010.01); H01M 4/02 (2006.01)
CPC H01M 10/0562 (2013.01) [C01B 17/22 (2013.01); H01M 4/366 (2013.01); H01M 4/382 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); H01M 10/0585 (2013.01); C01P 2002/72 (2013.01); H01M 2004/027 (2013.01); H01M 2300/008 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A sulfide solid electrolyte for all-solid secondary batteries, the sulfide solid electrolyte being a compound represented by Formula 1 below,
LiaP1SbXc  Formula 1
in Formula 1,
X may be fluorine (F), chlorine (Cl), bromine (Br), or iodine (I), and
4.7<a<5.3, 4.4≤b≤4.5, and 0.7<c<1.5,
wherein:
the sulfide solid electrolyte has an argyrodite-type crystal structure,
a ratio (I(29.0)/I(30.0) ratio) of a peak intensity at a 2θ of 29±0.1° to a peak intensity at a 2θ of 30±0.1° is 0.06 or less, the peak intensities being obtained by X-ray diffraction analysis of the sulfide solid electrolyte, and
a ratio (I(27.1)/I(30.0) ratio) of a peak intensity at a 2θ of 27.1±0.1° to a peak intensity at a 2θ of 30±0.1° is 0.06 or less, the peak intensities being obtained by X-ray diffraction analysis of the sulfide solid electrolyte.