Novel solid polymer electrolytes for all-solid-state lithium-sulfur batteries#br#

doi:10.12028/j.issn.2095-4239.2016.0021

Abstract

Abstract: Novel solid polymer electrolytes, composed of lithium (fluorosulfonyl)(trifluoromethanesulfonyl) imide {Li[(FSO2)(CF3SO2)N], LiFTFSI} and poly(ethylene oxide) (PEO), are prepared by solution casting method. The physicochemical and electrochemical properties of LiFTFSI/PEO [n(EO)∶n(Li+)=16] electrolyte are investigated by the differential scanning calorimeter (DSC), thermogravimetric analysis (TGA), linear sweep voltammogram (LSV), electrochemical impedance spectroscopy (EIS), and potentiostatic direct current (DC) polarization. It is demonstrated that LiFTFSI/PEO electrolyte exhibits a relatively high ionic conductivity (σ≈10−5 S/cm) at 25 ℃, sufficient electrochemical stability (4.63 V vs. Li/Li+), and is thermally stable up to 256 ℃. More importantly, the complex of LiFTFSI/PEO displays a relatively high initial discharge capacity (881 mA•h/g) and effectively inhibits the shuttle effect arising from dissolved polysulfides in lithium-sulfur (Li-S) batteries, and exhibits a good cycling performance of Li-S batteries.

Key words: lithium (fluorosulfonyl)(trifluoromethanesulfonyl) imide, solid polymer electrolytes, poly (ethylene oxide), lithium-sulfur batteries

MA Qiang1,2, QI Xinguo1, RONG Xiaohui1, HU Yongsheng1, ZHOU Zhibin2, LI Hong1, . Novel solid polymer electrolytes for all-solid-state lithium-sulfur batteries#br#[J]. Energy Storage Science and Technology, 2016, 5(5): 713-718.

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