| 학회 | 한국재료학회 |
| 학술대회 | 2015년 가을 (11/25 ~ 11/27, 부산 해운대그랜드호텔) |
| 권호 | 21권 2호 |
| 발표분야 | C. 에너지 재료 |
| 제목 | MoS2 microflowers as a stable and high performance anode material for sodium-ion batteries |
| 초록 | Sodium-ion batteries are most probable alternative system to current Li-ion batteries, because of sodium is highly abundant in earth's crust. But, Na-ion batteries still have many obstacles for commercialization, although researchers have proposed a number of electrode materials for Na-ion batteries [1, 2]. In particular, negative electrodes for Na-ion batteries are one of the major challenging issues, because graphite, the representative anode material for Li-ion batteries, shows low Na-ion intercalation/deintercalation capability [3]. Here we report the pure MoS2 microflowers with nano-sized petals which are prepared by combination of hydrothermal reaction followed by calcination for Na-ion battery anode materials. The electrochemical performance of MoS2 microflowers with different binders (PVDF, PEO and Na-alginate) is evaluated against pure Na metal in a half-cell configuration through a conversion reaction. Especially, the electrode of MoS2 microflowers with a Na-alginate binder shows excellent cyclic stability, delivering a high discharge capacity of 595 mAh g-1 after 50 cycles. Also, it exhibit high rate capability, retaining a capacity of 236 mAh g-1 at 10C without any carbonaceous materials. The improved electrochemical performance was mainly attributed to the synergetic effect of the morphology of MoS2 microflowers and good adhesive properties of alginate binder. Furthermore, we report a Na-ion full cell using the MoS2 microflowers anode with a Na3V2O2x(PO4)2F3-2x/C as a cathode material. References: 1. C. Masquelier, L. Croguennec, Chem. Rev. 113 (2013) 6552−65915. 2. V. Palomares, M. Casas-Cabanas, E. Castillo-Martínez, M. H. Han, T. Rojo, Energy Environ. Sci. 6, (2013) 2312–2337. 3. H. Kim, J. Hong, Y.U. Park, J. Kim, I. Hwang, K. Kang, Adv. Funct. Mater. 25 (2015) 534–541. |
| 저자 | 김도경, 정영화, P. Ramesh Kumar |
| 소속 | 한국과학기술원 (KAIST) |
| 키워드 | MoS2 microflowers; Binder effect; Sodium alginate; High rate capability; Na-ion Full cell |
