Journal
SOLID STATE IONICS
Volume 177, Issue 7-8, Pages 721-726Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2006.01.014
Keywords
lithium batteries; gel polymer electrolytes; propylene carbonate; conductivity
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The influence of an organophosphosphate additive on poly(ethylene oxide) lithium bis(trifluoromethylsulfonyl)imide-based gel polymer electrolytes for secondary lithium battery applications is described. Tris(2-(2-methoxyethoxy)ethyl)phosphate, is compared to the well known gel-battery component, propylene carbonate, through a study of complex impedance analysis, differential scanning calorimetry, and limiting oxygen index combustion analysis. The conductivities of the gels at low concentrations of tris(2-(2-methoxyethoxy)ethyl)phosphate (1.9-4.2 mol%) are higher to those of propylene carbonate-based systems with the same concentration. Despite micro-phase separation at high concentrations of tris (2-(2-methoxyethoxy)ethyl)phosphate (7.0-14.9 mol%), the conductivities remain comparable to systems that use propylene carbonate. The addition of tris(2-(2-methoxyethoxy)ethyl)phosphate to poly(ethylene oxide) gives increased fire retardance, while the addition of propylene carbonate to poly(ethylene oxide) results in increased flammability. (c) 2006 Elsevier B.V. All rights reserved.
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