Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 2, Pages 488-492Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201307137
Keywords
electrolytes; ionic liquids; lithium dendrites; lithium metal battery; nanoparticles
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Funding
- Energy Materials Center at Cornell, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001086]
- NSF [DMR-1120296]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1006323] Funding Source: National Science Foundation
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Development of rechargeable lithium metal battery (LMB) remains a challenge because of uneven lithium deposition during repeated cycles of charge and discharge. Ionic liquids have received intensive scientific interest as electrolytes because of their exceptional thermal and electrochemical stabilities. Ionic liquid and ionic-liquid-nanoparticle hybrid electrolytes based on 1-methy-3-propylimidazolium (IM) and 1-methy-3-propylpiperidinium (PP) have been synthesized and their ionic conductivity, electrochemical stability, mechanical properties, and ability to promote stable Li electrodeposition investigated. PP-based electrolytes were found to be more conductive and substantially more efficient in suppressing dendrite formation on cycled lithium anodes; as little as 11wt% PP-IL in a PC-LiTFSI host produces more than a ten-fold increase in cell lifetime. Both PP- and IM-based nanoparticle hybrid electrolytes provide up to 10000-fold improvements in cell lifetime than anticipated based on their mechanical modulus alone. Galvanostatic cycling measurements in Li/Li4Ti5O12 half cells using IL-nanoparticle hybrid electrolytes reveal more than 500cycles of trouble-free operation and enhanced rate capability.
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