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- W332000434 abstract "Electrical conductivity, DSC and {sup 7}Li NMR studies have been carried out on liquid electrolytes such as EC:PC and EC:DMC containing LiPF{sub 6} (and LiCF{sub 3}SO{sub 3} for NMR) and films plasticized using the same liquid electrolytes. The films are based on poly(vinylidene fluoride) copolymerized with hexafluoropropylene and contain fumed silica. All measurements were carried out at atmospheric pressure from room temperature to about 120K and the electrical conductivity studies were performed at room temperature at pressures up to 0.3 GPa. The liquids and hybrid electrolytes are similar in that the electrical conductivity of the EC:PC based materials exhibits VTF behavior while that for the EC:DMC based materials does not. Further, the glass transition temperatures as determined from NMR, DSC and electrical conductivity measurements are about the same for the liquids and hybrid electrolytes. However, substantial differences are found. The electrical conductivity of the hybrid electrolytes at room temperature is lower than expected and, more importantly, the relative change of conductivity with pressure is larger than for the liquids. In addition, above the glass transition temperature, the NMR T1 values are smaller for the plasticized films than for the liquids, while at both low and high temperature the NMR linemore » widths are larger. Consequently, it is concluded that significant solid matrix-lithium ion interactions take place.« less" @default.
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- W332000434 date "1998-07-01" @default.
- W332000434 modified "2023-09-27" @default.
- W332000434 title "NMR, DSC and high pressure electrical conductivity studies on liquid and hybrid electrolytes. Technical report, 1 Jun 1997--31 May 1998" @default.
- W332000434 hasPublicationYear "1998" @default.
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