Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 154, Issue 7, Pages A677-A681Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.2736646
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The physical properties and electrochemical performances were systematically compared among a quaternary ammonium cation-based room-temperature ionic liquid electrolyte (ILE), a solid polymer electrolyte (SPE), and a conventional organic liquid electrolyte (OLE). The ionic conductivity, an interface impedance at the Li/electrolyte, and the activation energy at the interface were in the order of OLE > ILE > SPE. Cells using ILE and SPE exhibited sufficiently high discharge capacities of approximately 160 mAh g(-1) at the 100th cycle using LiFePO4 cathode. The required operation temperatures at a rate of 1C discharge, for which the discharge capacity at 1C was >90% of that obtained at C/8, were 363 K using SPE and 333 K using ILE. (C) 2007 The Electrochemical Society.
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