Plasticizers for solid polymer electrolytes. Technical report, May 1993-May 1994
The ionic conductivity of a solid polymer electrolyte based on a lithium salt dissolved in a poly(ethylene oxide) (PEO) host was significantly improved with the use of plasticizing agents and a lithium ion coordinating compound. Either a plasticizing salt, solvent or combinations of both were incorporated into freestanding solution-cast films of (PEO)x(LiCF3SO3). The greatest enhancement of conductivity was observed when the plasticizing salt (LiN(CF3SO2)2) and a plasticizing solvent (diethyl phthalate, dimethyl phthalate, or dimethylglycol phthalate) were combined, with most notable improvement occurring below the melting temperature of PEO (approx. 66 deg C). Addition of a low concentration of 6,6-dibenzyl-14-crown-4, a lithium ion coordinating compound, also improved ionic conductivity. Electrochemical stability was determined by cyclic voltammetry, showing that plasticizers were generally stable between 4.3 V and 1.5 V versus lithium.
- Research Organization:
- Army Research Lab., Fort Monmouth, NJ (United States)
- OSTI ID:
- 121845
- Report Number(s):
- AD-A-294856/0/XAB; ARL-TR-420; TRN: 52890628
- Resource Relation:
- Other Information: PBD: Feb 1995
- Country of Publication:
- United States
- Language:
- English
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