Tailoring oxygen redox reactions in ionic liquid based Li/O 2 batteries by means of the Li + dopant concentration
The reusability, non-volatility and non-corrosiveness of ionic liquids (ILs), as well as their ease of isolation and a large electrochemical stability window, make them an interesting choice as environmentally friendly electrolytes for metal/air batteries. ILs have been described as designer solvent...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_23984902_v2_n1_p118_Cecchetto http://hdl.handle.net/20.500.12110/paper_23984902_v2_n1_p118_Cecchetto |
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paper:paper_23984902_v2_n1_p118_Cecchetto2023-06-08T16:35:54Z Tailoring oxygen redox reactions in ionic liquid based Li/O 2 batteries by means of the Li + dopant concentration Electric batteries Electrolytes Electrolytic reduction Ionic liquids Lithium batteries Oxygen Reaction rates Redox reactions Reusability Battery performance Discharge capacities Dopant concentrations Electrochemical stabilities Ionic liquid electrolytes Oxygen redox reactions Oxygen reduction reaction Product distributions Lithium compounds concentration (composition) design electrolyte energy storage equipment component ionic liquid lithium oxide group oxygen precipitation (chemistry) reaction kinetics redox conditions The reusability, non-volatility and non-corrosiveness of ionic liquids (ILs), as well as their ease of isolation and a large electrochemical stability window, make them an interesting choice as environmentally friendly electrolytes for metal/air batteries. ILs have been described as designer solvents as their properties and behaviour can be adjusted to suit an individual reaction need. In the framework of this study we applied a conceptually similar design approach and showed that a simple parameter such as the concentration of a Li + dopant dramatically affects the reaction yields of Li/O 2 based energy storage devices. We studied the effect of Li + concentration from 0.1 to 1 M in a LiTFSI:PYR 14 TFSI ionic liquid electrolyte on the kinetics of the oxygen reduction reaction (ORR) and on the formation rate of different Li-O species at two different temperatures, finding that the discharge capacity, rates and product distribution change in a non-linear way. At 60 °C, the highest rates and up to one order of magnitude larger capacities were observed at intermediate LiTFSI concentrations, implying a complete mechanism switch from surface to volume phase mediation for Li 2 O 2 precipitation. At room temperature the same evolution was observed, even if in this case the surface mediation remained predominant at all concentrations. These results suggest the possibility to optimise the ionic liquid based Li/O 2 battery performances in terms of discharge capacity and lithium use, by tuning the temperature and alkali cation concentration. © The Royal Society of Chemistry 2018. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_23984902_v2_n1_p118_Cecchetto http://hdl.handle.net/20.500.12110/paper_23984902_v2_n1_p118_Cecchetto |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Electric batteries Electrolytes Electrolytic reduction Ionic liquids Lithium batteries Oxygen Reaction rates Redox reactions Reusability Battery performance Discharge capacities Dopant concentrations Electrochemical stabilities Ionic liquid electrolytes Oxygen redox reactions Oxygen reduction reaction Product distributions Lithium compounds concentration (composition) design electrolyte energy storage equipment component ionic liquid lithium oxide group oxygen precipitation (chemistry) reaction kinetics redox conditions |
| spellingShingle |
Electric batteries Electrolytes Electrolytic reduction Ionic liquids Lithium batteries Oxygen Reaction rates Redox reactions Reusability Battery performance Discharge capacities Dopant concentrations Electrochemical stabilities Ionic liquid electrolytes Oxygen redox reactions Oxygen reduction reaction Product distributions Lithium compounds concentration (composition) design electrolyte energy storage equipment component ionic liquid lithium oxide group oxygen precipitation (chemistry) reaction kinetics redox conditions Tailoring oxygen redox reactions in ionic liquid based Li/O 2 batteries by means of the Li + dopant concentration |
| topic_facet |
Electric batteries Electrolytes Electrolytic reduction Ionic liquids Lithium batteries Oxygen Reaction rates Redox reactions Reusability Battery performance Discharge capacities Dopant concentrations Electrochemical stabilities Ionic liquid electrolytes Oxygen redox reactions Oxygen reduction reaction Product distributions Lithium compounds concentration (composition) design electrolyte energy storage equipment component ionic liquid lithium oxide group oxygen precipitation (chemistry) reaction kinetics redox conditions |
| description |
The reusability, non-volatility and non-corrosiveness of ionic liquids (ILs), as well as their ease of isolation and a large electrochemical stability window, make them an interesting choice as environmentally friendly electrolytes for metal/air batteries. ILs have been described as designer solvents as their properties and behaviour can be adjusted to suit an individual reaction need. In the framework of this study we applied a conceptually similar design approach and showed that a simple parameter such as the concentration of a Li + dopant dramatically affects the reaction yields of Li/O 2 based energy storage devices. We studied the effect of Li + concentration from 0.1 to 1 M in a LiTFSI:PYR 14 TFSI ionic liquid electrolyte on the kinetics of the oxygen reduction reaction (ORR) and on the formation rate of different Li-O species at two different temperatures, finding that the discharge capacity, rates and product distribution change in a non-linear way. At 60 °C, the highest rates and up to one order of magnitude larger capacities were observed at intermediate LiTFSI concentrations, implying a complete mechanism switch from surface to volume phase mediation for Li 2 O 2 precipitation. At room temperature the same evolution was observed, even if in this case the surface mediation remained predominant at all concentrations. These results suggest the possibility to optimise the ionic liquid based Li/O 2 battery performances in terms of discharge capacity and lithium use, by tuning the temperature and alkali cation concentration. © The Royal Society of Chemistry 2018. |
| title |
Tailoring oxygen redox reactions in ionic liquid based Li/O 2 batteries by means of the Li + dopant concentration |
| title_short |
Tailoring oxygen redox reactions in ionic liquid based Li/O 2 batteries by means of the Li + dopant concentration |
| title_full |
Tailoring oxygen redox reactions in ionic liquid based Li/O 2 batteries by means of the Li + dopant concentration |
| title_fullStr |
Tailoring oxygen redox reactions in ionic liquid based Li/O 2 batteries by means of the Li + dopant concentration |
| title_full_unstemmed |
Tailoring oxygen redox reactions in ionic liquid based Li/O 2 batteries by means of the Li + dopant concentration |
| title_sort |
tailoring oxygen redox reactions in ionic liquid based li/o 2 batteries by means of the li + dopant concentration |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_23984902_v2_n1_p118_Cecchetto http://hdl.handle.net/20.500.12110/paper_23984902_v2_n1_p118_Cecchetto |
| _version_ |
1768543679982600192 |