Journal
JOURNAL OF POWER SOURCES
Volume 132, Issue 1-2, Pages 229-234Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2003.12.031
Keywords
polyvinylidene fluoride; ethylene carbonate; electrolyte; ionic conductivity; electrochemical cell; discharge capacity
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A study has been made of the electrical and electrochemical characteristics of polyvinylidene fluoride (PVDF)-based polymer electrolytes. The room-temperature ionic conductivity of PVDF increases by up to four orders of magnitude on addition of trifluoromethane sulfone (LiCF3SO3), and a further increase is observed with the incorporation of an ethylene carbonate (EC) plasticizer. The conductive behavior of the electrolytes over a wide temperature range (-100 to 100 degreesC) is examined. An electrochemical cell has been fabricated using the film that gives the highest ionic conductivity at room temperature. The discharge characteristics of cells stored/heated at different temperatures have been studied in the 4.2-2.5 V voltage range. A greater discharge capacity is delivered on heating. In general, the discharge capacity and the capacity retention increase with the increase in temperature. This can be attributed to a reduction in the interfacial resistance due to an improvement in the electrolyte\electrode interfacial adhesion. (C) 2004 Elsevier B.V. All rights reserved.
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