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American Chemical Society, Nano Letters, 11(14), p. 6572-6577, 2014

DOI: 10.1021/nl5031985

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An Advanced Lithium-Air Battery Exploiting an Ionic Liquid-Based Electrolyte

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

A novel lithium-oxygen battery exploiting a PYR14TFSI-LiTFSI ionic liquid as the electrolyte medium is reported. The Li/PYR14TFSI-LiTFSI/O2 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/O2 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.