| 리튬 2차 전지용 양극활물질 LiMO2(M=Co,Ni)의 온도와 산소 분압에 따른 상전이 거동 |
| 황성주, 김호진, 정연욱, 이준형, 김정주 |
| 경북대학교 무기재료공학과 |
| Phase Evolution in LiMO2(M=Co,Ni) Cathode Materials for Secondary Lithium Ion Batteries : Effect of Temperature and Oxygen Partial Pressure |
| Cheng-Zhu Huang, Ho-Jin Kim, Yeon-Uk Jeong, Joon-Hyung Lee, Jeong-Joo Kim |
| Department of Inorganic Materials Engineering, Kyungpook National University |
|
|
|
|
|
| ABSTRACT |
|
$LiMO_{2}(M=Co,Ni)$ samples were synthesized with $Li_{2}CO_{3},;Co_{3}O_{4}$, and NiO by the solid-state reaction method. In the case of $LiCoO_{2}$, at low temperature$(T=400^{circ}C)$ spinel structure was synthesized and the obtained spinel phase was transformed to layered phase at high temperature$(Tge600^{circ}C)$. The phase transition behaviors of $LiCoO_{2}$ were investigated with various heating temperature and time. The rate of transition was directly proportional to the concentrations of reactant, and activation energy of reaction was around 6.76 kcal/mol. When CoO(rock salt structure) was used as a starting material instead of $Co_{3}O_{4}$(spinel structure), layered structure of $LiCoO_{2}$ was obtained at low temperature. In the case of $LiNiO_{2}$ the transition from layered structure to rock salt structure occurred easily by disordering/ordering reaction, but did not occur in $LiCoO_{2}$. The difference in metal ion radii in $LiCoO_{2}$ and $LiNiO_{2}$ results in different behaviors of phase transitions. |
| Key words:
Lithium-cobalt-oxide, Spinel, Layered, Structure, Phase transition |
|
|
|
PDF Links
Full text via DOI
Download Citation 
