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Autoxidation in amide-based electrolyte and its suppression for enhanced oxygen efficiency and cycle performance in non-aqueous lithium oxygen battery
- Source :
- Journal of Power Sources. 347:186-192
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- In spite of several desirable properties such as high stability against superoxide anion and low vapor pressure, N -methyl-2-pyrrolidone (NMP) electrolyte is reported not suitable for use in lithium-oxygen (Li-O 2 ) batteries because of severe degradation upon cycling and low oxygen efficiency. In this work, we find that NMP electrolyte is reactive with O 2 gas in the presence of lithium metal and such O 2 -consuming reaction ( i.e., autoxidation) is a possible cause for the poor performance in Li-O 2 batteries with NMP electrolyte. The autoxidation of NMP is verified by direct measurement of the depletion of O 2 gas in the hermetically sealed symmetric Li/Li cells via in-situ gas pressure analysis. In-situ differential electrochemical mass spectroscopy (DEMS) experiment reveals that the autoxidation resulted in significant O 2 consumption upon discharge, very low O 2 efficiency upon charge, and eventually fast capacity fading. Lithium nitrate (LiNO 3 ), which provides a protective layer on the surface of lithium metal, is employed to suppress the autoxidation, leading to significantly enhanced oxygen efficiency and cycle life.
- Subjects :
- Battery (electricity)
Autoxidation
Lithium nitrate
Renewable Energy, Sustainability and the Environment
Vapor pressure
Inorganic chemistry
Energy Engineering and Power Technology
chemistry.chemical_element
02 engineering and technology
Electrolyte
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
Oxygen
0104 chemical sciences
chemistry.chemical_compound
chemistry
Lithium
Electrical and Electronic Engineering
Physical and Theoretical Chemistry
0210 nano-technology
Subjects
Details
- ISSN :
- 03787753
- Volume :
- 347
- Database :
- OpenAIRE
- Journal :
- Journal of Power Sources
- Accession number :
- edsair.doi...........cbd3a946b6cf428a57dbbe8c61be3c15