US 12,322,759 B2
Electrolytic solution, lithium-sulfur secondary battery, and module
Tomoya Hidaka, Osaka (JP); Yoshiko Kuwajima, Osaka (JP); and Shigeaki Yamazaki, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Appl. No. 17/596,113
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
PCT Filed Jun. 5, 2020, PCT No. PCT/JP2020/022276
§ 371(c)(1), (2) Date Dec. 3, 2021,
PCT Pub. No. WO2020/246578, PCT Pub. Date Dec. 10, 2020.
Claims priority of application No. 2019-105668 (JP), filed on Jun. 5, 2019.
Prior Publication US 2022/0158248 A1, May 19, 2022
Int. Cl. H01M 10/0569 (2010.01); H01M 4/38 (2006.01); H01M 4/58 (2010.01); H01M 4/60 (2006.01); H01M 10/052 (2010.01); H01M 10/0568 (2010.01); H01M 4/02 (2006.01)
CPC H01M 10/0569 (2013.01) [H01M 4/38 (2013.01); H01M 4/58 (2013.01); H01M 4/60 (2013.01); H01M 10/052 (2013.01); H01M 10/0568 (2013.01); H01M 2004/028 (2013.01); H01M 2300/0034 (2013.01)] 11 Claims
 
1. A lithium-sulfur secondary battery comprising a positive electrode or a negative electrode containing a sulfur-containing electrode active material containing at least one selected from the group consisting of simple sulfur, lithium polysulfides (Li2Sn: 1≤n≤8) and organosulfur compounds, wherein the lithium-sulfur secondary battery comprises an electrolytic solution comprising:
a fluorinated ether which is at least one selected from the group consisting of HCF2CF2OCH2CH2CH3, HCF2CF2CH2OCH2CH3, HCF2CF2CH2OCH2CH2CH3, CF3CHFCF2OCH2CH3 and CF3CHFCF2OCH2CH2CH3;
an ether compound represented by formula (2):
R4—(OCHR3CH2)x—OR5  (2)
wherein R4 and R5 are each independently selected from the group consisting of alkyl groups having 1 to 9 carbon atoms and having no fluorine atom, a phenyl group optionally substituted by a halogen atom and a cyclohexyl group optionally substituted by a halogen atom, and optionally together form a ring; R3 each independently represent H or CH3; and x represents 0 to 10; and
an alkali metal salt.