期刊
ELECTROCHIMICA ACTA
卷 258, 期 -, 页码 1284-1292出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.11.185
关键词
Lithium sulfur battery; Sulfur-CNT cathode; Gel polymer electrolyte; Ionic liquid electrolyte; Electrochemical impedance spectroscopy
资金
- FIU Dissertation Year Fellowship
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1506640] Funding Source: National Science Foundation
Lithium-sulfur batteries using a lithium anode, sulfur-CNT cathode, and gel polymer electrolyte composed of a poly(ionic liquid), an ionic liquid, and lithium salt are reported. Cyclic charge-discharge studies at various discharge and charge rates for 100 cycles and at a fixed rate for 500 cycles show superior performance for the gel polymer electrolyte (GPE) compared to the ionic liquid electrolyte (ILE) containing batteries. Rapid capacity fading for the first few cycles is observed and its causes are studied using an electrochemical impedance spectroscopy (EIS) approach. EIS reveals a depth-of-discharge dependent impedance growth during the first discharge cycle, that is followed by an interfacial resistance growth between the electrodes and the electrolytes in subsequent cycles. (C) 2017 Elsevier Ltd. All rights reserved.
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