| 학회 | 한국재료학회 |
| 학술대회 | 2018년 가을 (11/07 ~ 11/09, 여수 디오션리조트) |
| 권호 | 24권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | Monoclinic Na2.4V2(PO4)3 Coated with Conductive Polymer for High Electrochemical Performances on Na-ion batteries |
| 초록 | We report a monoclinic Na2.4V2(PO4)3/poly(3,4-ethylenedioxythiophene) (M-NVP/PEDOT) composite as a novel cathode material for sodium-ion batteries. The active materials were homogenously encapsulated by thin layers of the electro-conductive polymer PEDOT, and X-ray diffraction analysis indicated that the final products were crystallized into a monoclinic structure. The composite exhibited much more outstanding power capability and cyclability than pristine M-NVP. The discharge capacity of the M-NVP/PEDOT electrode was maintained up to ~109.8 mAh g-1 at 10C (=1.78 A g−1), which was ~9 times higher than that of the pristine M-NVP under the same conditions. Moreover, whereas severe capacity degradation was observed for the pristine M-NVP, the M-NVP/PEDOT composite delivered ~81% capacity retention compared with the initial capacity over ~500 cycles at 1C. In particular, the available capacity of the M-NVP/PEDOT was ~143.3 mAh g-1, corresponding to ~2.4 mol Na+ (de)intercalation, which is larger than the reversible capacity of rhombohedral Na3V2(PO4)3, at which only 2 mol Na+ can be (de)intercalated. This unexpected high capacity of the M-NVP/PEDOT composite was clearly confirmed through combined studies using several experiments and first-principles calculation. * Lee, Y., et al., Unexpectedly high electrochemical performances of a monoclinic Na2.4V2(PO4)3/conductive polymer composite for Na-ion batteries. Journal of Materials Chemistry A, 2018 |
| 저자 | 이용석, 김종순 |
| 소속 | 세종대 |
| 키워드 | <P>Vanadium phosphate; Chemical exchage; Sodium battery</P> |
