| 학회 | 한국재료학회 |
| 학술대회 | 2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 | 22권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | Development of new cathode materials for Li/Na ion batteries using Neutron diffraction |
| 초록 | Recently, neutron diffraction has been considered as a powerful tool to develop new cathode materials for Li/Na ion batteries. By the advatange of neutron, we can clearly identify the structural information about light elements such as Li, O, and Na ions in the electrode materials and serapate the neighborhood elements in periodic table such as Fe, Mn, Co, and Ni which are the most gernerally used transition metals for Li/Na ion batteries. The number of users to study Li/Na ion batteries using neutron diffraction significantly increase in the world. We studied about the development of new cathode materials for Li/Na ion batteries using neutron diffraction. The first work is the development of alluaudite LiFePO4 which is non-olivine phase. Novel alluaudite LiFePO4 was successfully prepared, and its structure was investigated in detail through Rietvled refinement of their neutron diffraction patterns. It is identified that the alluaudite LiFePO4 shows promising electrochemical properties allowing reversible extraction and insertion of ~0.8 Li+ ions in the structure with one-phase based reaction. The second work is the development of Na7V3(P2O7)4 which is a new cathode material for Na ion batteries. its structure was investigated in detail through the combined study of neutron diffraction and X-ray diffraction. ~4.13V redox potential (the highest redox voltage among vanadium-based cathodes reported thus far for Na ion batteries) and outstanding cycle stability (75% retention of the initial capacity after 600 cycles) of Na7V3(P2O7)4 were clearly identified through a combination of first-principles calculations and experiments. Additionally, through simple experiments using neutron diffraction, we can find the possible ionic diffusion paths of cathode or solid-electrolyte for Li/Na ion batteries. Bond valence sum (BVS) energy map is calculation of bonding information among each atom based on valence of atoms and Rietveld refinement data. Maximum Entropy Method (MEM) is finding possible position of each atoms through analysis of integrated intensities of ND or XRD patterns when entropy is maximized. Through these two methods, we can find expected and possible Li/Na diffusion paths in the electrode materials for Li/Na ion batteries. We strongly believe that these studies give you the big Insight for development of the new electrode materials for Li/Na ion battery. References [1] J. Kim, H. Kim, I. Park, Y.-U. Park, J.-K. Yoo, K.-Y. Park, S. Lee, and K. Kang, Energy & Environ. Sci., 6, 830-834 (2013) [2] J. Kim, H. Kim, K.-Y. Park, Y.-U. Park, S. Lee, H.-S. Kwon, H.-I. Yoo, and K. Kang, J. Mater. Chem. A, 2, 8632-8636 (2014) [3] J. Kim, I. Park, H. Kim, K.-Y. Park, Y.-U. Park, K. Kang, Adv. Energy Mater., 6, 1502147 (2016) [4] K.-Y. Park, H. Kim, S. Lee, J. Kim, J. Hong, H.-D. Lim, I. Park, K. Kang, CrystEngComm, Accepted (2016) |
| 저자 | Jongsoon Kim |
| 소속 | Korea Atomic Energy Research Institute (KAERI) |
| 키워드 | Neutron diffraction; Li ion battery; Na ion battery |
