| 학회 | 한국재료학회 |
| 학술대회 | 2013년 봄 (05/23 ~ 05/24, 여수 엠블호텔(THE MVL)) |
| 권호 | 19권 1호 |
| 발표분야 | C. 에너지/환경 재료(Energy and Environmental Materials) |
| 제목 | A faceted high voltage spinel LiNi0.5Mn1.5O4 with ultrahigh rate performance as a cathode material for Li-ion batteries |
| 초록 | Developing cathode materials with high energy density is amongst the key challenges for future Li-ion batteries. High energy density can be obtained either by high voltage or high capacity therefore many people are working on developing new materials with higher capacity and higher voltages. LiNi0.5Mn1.5O4 is one of the potential candidates for high voltage materials operating at around 4.7 V and has comparable capacity to LiCoO2 and LiFePO4. LiNi0.5Mn1.5O4 can exist in two forms, ordered and disordered depending on Ni/Mn ordering in the octahedral sites. Most people showed that disordered LiNi0.5Mn1.5O4 has better rate capability and cycling performance as compared to ordered LiNi0.5Mn1.5O4 mainly due to presence of Mn3+, owing to enhanced electronic conductivity of disordered LiNi0.5Mn1.5O4. In this work, spinel LiNi0.5Mn1.5O4 was synthesized by combined sol-gel method with solid state reaction. Two different morphologies (i.e. faceted and non-faceted particles) were obtained by varying the synthesis conditions before solid state reaction. Faceted particles showed superior rate capability performance as compared to non-faceted particles. At higher C-rates, the performance of a faceted LiNi0.5Mn1.5O4 was much better than a non-faceted LiNi0.5Mn1.5O4. A faceted LiNi0.5Mn1.5O4 showed the capacity of around 117 mAh g-1 at 40 C and around 68 mAh g-1 at 120 C. This simple and low cost synthetic approach for high voltage spinel will provide a novel pathway to overcome the challenges to achieve high power density in advanced battery applications. |
| 저자 | Umair Nisar, Young Hwa Jung, Do Kyung Kim |
| 소속 | KAIST |
| 키워드 | LiNi0.5Mn1.5O4; Sol-gel; |
