| 학회 | 한국재료학회 |
| 학술대회 | 2015년 가을 (11/25 ~ 11/27, 부산 해운대그랜드호텔) |
| 권호 | 21권 2호 |
| 발표분야 | C. 에너지 재료 |
| 제목 | Stabilization of Battery Electrode/Electrolyte Interfaces Employing Nanocrystals with Passivating Epitaxial Shells |
| 초록 | High power density and excellent cycling stability in lithium ion battery (LIBs) are required to meet the criteria for the power source such as electric vehicles. Higher power density is generally hindered by sluggish diffusion of Li ions in micrometric materials commonly adopted in LIBs. Size reduction of active materials can significantly improve the rate of lithium ions because of the shortened length of diffusion path. In the meantime, high surface area enables facile access of charges via large contact area with the electrolyte or electronic conducting additives. In this perspective, much effort have been devoted to the nanosized particles, which report the high power density that cannot be achieved from the micrometric counterparts. However, in return, increased surface area of particles can lead to the vigorous unfavorable interfacial reaction that mainly occurs through the energetically unstable surface such as dissolution of active materials and decomposition of electrolyte. Reducing the active transition metal in the vicinity of the surface by partially replacing inactive ions can improve the interfacial stability, but must be prepared as the form of thin passivating barriers to preserve storage capacity. Post-synthetic coating procedure with stable phases such as Al2O3 and MgO, has been performed on the surface of particles as the most common approach, however, it is difficult for coating phases to access buried interfaces because of agglomerated feature of the particles. Herein, core-shell (C-S) LiMn2O4 NCs are prepared by mixing precursor C-S NCs and Li sources followed by thermal treatment. The electrochemical properties will be evaluated in Li metal half cells compared to the counterpart without shell layer. The effect of the shell layer on the electrochemical stability will be discussed. |
| 저자 | Jordi Cabana1, Robert F. Klie2, Raffaella Buonsanti3, Angang Dong4, Linping Xu5, Patrick J. Philips6, Chunjoong Kim2 |
| 소속 | 1Department of Chemistry, 2Univ. of Illinois at Chicago, 3Chicago, 4Illinois 60607, 5United States, 6Department of Physics |
| 키워드 | Battery; Core-shell structure; Nanoparticles |
