| 학회 |
한국재료학회 |
| 학술대회 |
2015년 가을 (11/25 ~ 11/27, 부산 해운대그랜드호텔) |
| 권호 |
21권 2호 |
| 발표분야 |
C. 에너지 재료 |
| 제목 |
Polyanion compounds as positive electrode materials for rechargeable aqueous sodium-ion batteries |
| 초록 |
Sodium-ion batteries (SIBs) are potential next-generation batteries that can alleviate the cost and resource challenges of lithium. Developing aqueous SIBs is more desirable to emphasize cost-effective factor combining with abundance of Na resources. Aqueous electrolytes exhibit higher ionic mobility as well as are cheaper than organic solvents. Moreover, safety concerns using flammable organic electrolytes could be resolve, therefore aqueous SIB systems would be safer and cheaper than the current organic solvent based LIBs. However, use of aqueous electrolytes imposes a significant challenge in finding appropriate electrode materials that operate within the limited potential window of water while generating reasonably high cell-voltages. Here we introduce two polyanion compounds with carbonaceous composites as promising electrode materials for aqueous SIBs. As the 3-dimensional frameworks of polyanion compounds can accommodate large Na ions and provide easy diffusion path as well as the structural stability, these materials show good cyclability and rate performances especially in safe and environmentally benign aqueous systems. High stability and excellent electrochemical properties of two polyanion compounds, Na2FeP2O7 and Na3V2O2x(PO4)2F3-2x, in aqueous electrolytes will be introduced. |
| 저자 |
김도경, 김주형, P. Ramesh Kumar, 정영화
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| 소속 |
한국과학기술원 (KAIST) |
| 키워드 |
<P>Polyanion compounds; aqueous electrolyte; high ionic mobility</P>
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| E-Mail |
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