Journal
ADVANCED ENERGY MATERIALS
Volume 2, Issue 11, Pages 1343-1350Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201200130
Keywords
batteries; charge transport; doping; structure-property relationships
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Funding
- National Science Foundation [0202620]
- Italian Foreign Ministry
- Italian Ministry of University Research (MURST)
- U.S. Air Force Office of Scientific Research
- U.S. Army Research Office (ARO) [W911NF-07-1-0556]
- Office Of The Director
- Office Of Internatl Science &Engineering [0202620] Funding Source: National Science Foundation
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The phase behavior and ionic conductivity of tetraethylammonium bis(trifluoromethane-sulfonyl)imide (Et4NTFSI) salt mixtures with LiTFSI have been examined. In addition, the phase behavior and crystal structure of neat LiTFSI is also reported. Two (1-x) Et4NTFSI-(x) LiTFSI (x = 0.50 and 0.67, where x is the mol fraction) mixed-salt crystalline phases form. Large variations in ionic conductivity are observed; these are attributed to solid-solid phase transitions of the neat Et4NTFSI salt creating disordered plastic crystalline phases and the formation of a low-melting eutectic composition between the neat Et4NTFSI salt and the 1/1 Et4NTFSI/LiTFSI (x = 0.50) phase. Although Et4NTFSI and LiTFSI melt at 102 and 234 degrees C, respectively, the two salts form a eutectic system with a melting temperature of 32 degrees C. Based upon the findings reported, a new conductivity mechanism is proposed for plastic crystalline salt-lithium salt electrolytes which is not ascribed to solid-state diffusion/conduction.
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