Abstract
The electrochemical performance of one-dimensional porous La0.5Sr0.5CoO2.91 nanotubes as a cathode catalyst for rechargeable nonaqueous lithium-oxygen (Li-O2) batteries is reported here for the first time. In this study, one-dimensional porous La0.5Sr0.5CoO2.91 nanotubes were prepared by a simple and efficient electrospinning technique. These materials displayed an initial discharge capacity of 7205 mAh g-1 with a plateau at around 2.66 V at a current density of 100 mA g-1. It was found that the La0.5Sr0.5CoO2.91 nanotubes promoted both oxygen reduction and oxygen evolution reactions in alkaline media and a nonaqueous electrolyte, thereby improving the energy and coulombic efficiency of the Li-O2 batteries. The cyclability was maintained for 85 cycles without any sharp decay under a limited discharge depth of 1000 mAh g-1, suggesting that such a bifunctional electrocatalyst is a promising candidate for the oxygen electrode in Li-O2 batteries.
Original language | English |
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Pages (from-to) | 78-84 |
Number of pages | 7 |
Journal | Electrochimica Acta |
Volume | 165 |
DOIs | |
Publication status | Published - 3 Mar 2015 |
Keywords
- Electrocatalyst
- LaSrCoO nanotubes
- Lithium-oxygen battery
- Oxygen electrode