Journal
NANO LETTERS
Volume 14, Issue 11, Pages 6572-6577Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl5031985
Keywords
Li-O-2 cell; ionic liquied; electrolyte; energy efficiency; lithium-oxygen battery
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Funding
- BMW AG within the ABILE (Air Batteries with Ionic Liquid Electrolytes) project
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Trade, Industry, and Energy [20124010203310]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20124010203310] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A novel lithium-oxygen battery exploiting PYR14TFSI-LiTFSI as ionic liquid-based electrolyte medium is reported. The Li/PYR14TFSI-LiTFSI/O-2 battery was fully characterized by electrochemical impedance spectroscopy, capacity-limited cycling, field emission scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The results of this extensive study demonstrate that this new Li/O-2 cell is characterized by a stable electrode-electrolyte interface and a highly reversible charge-discharge cycling behavior. Most remarkably, the charge process (oxygen oxidation reaction) is characterized by a very low overvoltage, enhancing the energy efficiency to 82%, thus, addressing one of the most critical issues preventing the practical application of lithium-oxygen batteries.
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