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Rechargeability of Liair cathodes pre-filled with discharge products using an ether-based electrolyte solution: implications for cycle-life of Liair cellsElectronic supplementary information (ESI) available. See DOI: 10.1039/c3cp51112j
The instability of currently used electrolyte solutions and of the carbon support during chargedischarge in non-aqueous lithiumoxygen cells can lead to discharge products other than the desired Li 2 O 2 , such as Li 2 CO 3 , which is believed to reduce cycle-life. Similarly, discharge in an O 2 atmo...
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| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Online Access: | Get full text |
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| Summary: | The instability of currently used electrolyte solutions and of the carbon support during chargedischarge in non-aqueous lithiumoxygen cells can lead to discharge products other than the desired Li
2
O
2
, such as Li
2
CO
3
, which is believed to reduce cycle-life. Similarly, discharge in an O
2
atmosphere which contains H
2
O and CO
2
impurities would lead to LiOH and Li
2
CO
3
discharge products. In this work we therefore investigate the rechargeability of model cathodes pre-filled with four possible Liair cell discharge products, namely Li
2
O
2
, Li
2
CO
3
, LiOH, and Li
2
O. Using Online Electrochemical Mass Spectrometry (OEMS), we determined the charge voltages and the gases evolved upon charge of pre-filled electrodes, thus determining the reversibility of the formation/electrooxidation reactions. We show that Li
2
O
2
is the only reversible discharge product in ether-based electrolyte solutions, and that the formation of Li
2
CO
3
, LiOH, or Li
2
O is either irreversible and/or reacts with the electrolyte solution or the carbon during its oxidation.
Charging of prefilled electrodes suggests that full cell rechargeability can be obtained only when Li
2
O
2
is the only discharge product. |
|---|---|
| ISSN: | 1463-9076 1463-9084 |
| DOI: | 10.1039/c3cp51112j |