期刊
NATURE CHEMISTRY
卷 7, 期 6, 页码 496-501出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.2260
关键词
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资金
- NRCan
- EcoEII programme
- NSERC
- Waterloo Institute of Nanotechnology
In the search for improved energy storage, rechargeable metal-oxygen batteries are very attractive owing to their reliance on molecular oxygen, which forms oxides on discharge that decompose reversibly on charge. Much focus has been directed at aprotic Li-O-2 cells, but the aprotic Na-O-2 system is of equal interest because of its better reversibility. We report here on the critical role and mechanism of phase-transfer catalysis in Na-O-2 batteries. We find that it is solely responsible for the growth and dissolution of micrometre-sized cubic NaO2 crystals and for the reversible cell capacity. In the absence of phase-transfer catalysis, quasi-amorphous NaO2 films are formed and cells exhibit negligible capacity. Electrochemical investigations provide a measure of the transportation of superoxide from the carbon electrode to the electrolyte phase by the phase transfer catalyst. This leads to a new understanding of the mechanism of Na-O-2 batteries that, significantly, extends to Li-O-2 cells and explains their different behaviour.
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