FT-IR investigation of ion association in plasticized solid polymer electrolytes

被引:83
作者
Bishop, AG [1 ]
MacFarlane, DR [1 ]
McNaughton, D [1 ]
Forsyth, M [1 ]
机构
[1] MONASH UNIV,DEPT MAT ENGN,CLAYTON,VIC 3168,AUSTRALIA
关键词
D O I
10.1021/jp9520456
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
FT-IR spectroscopy has been utilized to monitor ion association in plasticized solid polymer electrolytes (SPEs). The SPEs were prepared from a random copolymer of ethylene oxide (EO) and propylene oxide (PO) and the salt lithium trifluoromethanesulfonate (lithium triflate, LiTf). Tetraethylene glycol dimethyl ether (tetraglyme) and N,N'-dimethylformamide (DMF) were chosen as model-plasticizers. Despite having a similar dielectric constant to that of the polymer host, epsilon similar to 5, the incorporation of tetraglyme into the SPEs resulted in increased ion association. The addition of a higher dielectric constant solvent, DMF, epsilon = 36.7, resulted in decreased ion association iu the SPE. The effects of salt concentration (0.05-1.25 mol dm(-3)) and temperature (25-100 degrees C) upon ion association in SPEs were also investigated. At low salt concentrations, ion association was found to increase with temperature, however, at 1.25 mol dm(-3) the temperature dependence of ion association was dominated by concentration effects. There appears to be a maximum in the fraction of ''free'' ions at a LiCF3SO3 concentration of 0.4 mol dm(-3), preceded by a minimum at approximately 0.2 mol dm-(3), consistent with the molar conductivity behavior previously observed in these electrolytes.
引用
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页码:2237 / 2243
页数:7
相关论文
共 43 条
  • [1] ION ASSOCIATION EFFECTS AND IONIC-CONDUCTIVITY IN POLYMER ELECTROLYTES
    ALBINSSON, I
    MELLANDER, BE
    STEVENS, JR
    [J]. SOLID STATE IONICS, 1993, 60 (1-3) : 63 - 66
  • [2] ION AGGREGATION AND MORPHOLOGY FOR POLY(ETHYLENE OXIDE)-BASED POLYMER ELECTROLYTES CONTAINING RARE-EARTH-METAL SALTS
    BERNSON, A
    LINDGREN, J
    [J]. SOLID STATE IONICS, 1993, 60 (1-3) : 31 - 36
  • [3] BERNSON A, 1993, SOLID STATE IONICS, V60, P67
  • [4] BERNSON A, IN PRESS
  • [5] Billmeyer F.W., 1984, TXB POLYM SCI
  • [6] IONIC-CONDUCTIVITY AND DIFFUSIVITY IN POLYETHYLENE OXIDE ELECTROLYTE-SOLUTIONS AS MODELS FOR POLYMER ELECTROLYTES
    BODEN, N
    LENG, SA
    WARD, IM
    [J]. SOLID STATE IONICS, 1991, 45 (3-4) : 261 - 270
  • [7] IONIC TRANSPORT IN POLYMER ELECTROLYTES
    BRUCE, PG
    GRAY, FM
    SHI, J
    VINCENT, CA
    [J]. PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1991, 64 (05): : 1091 - 1099
  • [8] POLYMER ELECTROLYTES
    BRUCE, PG
    VINCENT, CA
    [J]. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1993, 89 (17): : 3187 - 3203
  • [9] ION MIGRATION IN LIQUID POLYMER ELECTROLYTES
    CAMERON, GG
    HARVIE, JL
    INGRAM, MD
    SORRIE, GA
    [J]. BRITISH POLYMER JOURNAL, 1988, 20 (03): : 199 - 202
  • [10] Cowie J. M. G., 1987, POLYM ELECTROLYTE RE, P69