Lithium Bis(fluorosulfonyl)imide/Poly(ethylene oxide) Polymer Electrolyte for All Solid-State Li-S Cell

Xabier Judez; Heng Zhang; Chunmei Li; José A González-Marcos; Zhibin Zhou; Michel Armand; Lide M Rodriguez-Martinez

doi:10.1021/acs.jpclett.7b00593

Lithium Bis(fluorosulfonyl)imide/Poly(ethylene oxide) Polymer Electrolyte for All Solid-State Li-S Cell

J Phys Chem Lett. 2017 May 4;8(9):1956-1960. doi: 10.1021/acs.jpclett.7b00593. Epub 2017 Apr 18.

Authors

Xabier Judez¹, Heng Zhang¹, Chunmei Li¹, José A González-Marcos², Zhibin Zhou³, Michel Armand¹, Lide M Rodriguez-Martinez¹

Affiliations

¹ CIC Energigune , Parque Tecnológico de Álava, Albert Einstein 48, 01510 Miñano, Álava, Spain.
² Department of Chemical Engineering, Faculty of Science and Technology, University of the Basque Country UPV-EHU , P.P. Box 644, 48080 Bilbao, Spain.
³ Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology , 1037 Luoyu Road, Wuhan 430074, China.

PMID: 28407471
DOI: 10.1021/acs.jpclett.7b00593

Abstract

Solid polymer electrolytes (SPEs) comprising lithium bis(fluorosulfonyl)imide (Li[N(SO₂F)₂], LiFSI) and poly(ethylene oxide) (PEO) have been studied as electrolyte material and binder for the Li-S polymer cell. The LiFSI-based Li-S all solid polymer cell can deliver high specific discharge capacity of 800 mAh g_sulfur^-1 (i.e., 320 mAh g_cathode^-1), high areal capacity of 0.5 mAh cm^-2, and relatively good rate capability. The cycling performances of Li-S polymer cell with LiFSI are significantly improved compared with those with conventional LiTFSI (Li[N(SO₂CF₃)₂]) salt in the polymer membrane due to the improved stability of the Li anode/electrolyte interphases formed in the LiFSI-based SPEs. These results suggest that the LiFSI-based SPEs are attractive electrolyte materials for solid-state Li-S batteries.