	US 11,682,790 B2
	Sulfide-based solid electrolyte, all-solid secondary battery including the same, and method of preparing the sulfide-based solid electrolyte
Hyorang Kang, Anyang-si (KR); Minsuk Lee, Suwon-si (KR); Taeheung Kim, Yangsan-si (KR); Duckki Yoon, Yangsan-si (KR); and Hyungsik Lim, Yangsan-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Gyeonggi-do (KR); SAMSUNG SDI CO., LTD., Gyeonggi-do (KR); and POSCO JK SOLID SOLUTION CO., LTD., Gyeongsangnam-do (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR); Samsung SDI Co., Ltd., Yongin-si (KR); and JEONGKWAN Co., Ltd, Yangsan-si (KR)
Filed on Feb. 14, 2020, as Appl. No. 16/791,296.
Claims priority of application No. 10-2019-0026477 (KR), filed on Mar. 7, 2019.
Prior Publication US 2020/0287238 A1, Sep. 10, 2020
Int. Cl. H01M 10/0562 (2010.01); H01M 10/0525 (2010.01)

CPC H01M 10/0562 (2013.01) [H01M 10/0525 (2013.01); H01M 2300/008 (2013.01)]

20 Claims

1. A sulfide solid electrolyte comprising:

an ionic conductor comprising a PS₄³⁻ unit, a P₂S₆⁴⁻ unit, and a P₂S₇⁴⁻ unit; and

a lithium compound comprising a LiCl,

wherein

a molar ratio of the P₂S₆⁴⁻ unit to the PS₄³⁻ unit is 1:1 to 5:1,

a molar amount of the P₂S₇⁴⁻ unit is greater than 0 to 60% or less, with respect to a total molar amount of the PS₄³⁻ unit, the P₂S₆⁴⁻ unit, and the P₂S₇⁴⁻ unit,

a molar amount of the PS₄³⁻ unit is 5% to 30%, with respect to the total molar amount of the PS₄³⁻ unit, the P₂S₆⁴⁻ unit, and the P₂S₇⁴⁻ unit, and

wherein the sulfide solid electrolyte is amorphous and has an ionic conductivity at room temperature of 1×10⁻³Siemens per centimeter to 1×10⁻¹Siemens per centimeter.