| 학회 | 한국재료학회 |
| 학술대회 | 2011년 봄 (05/26 ~ 05/27, 제주 휘닉스 아일랜드) |
| 권호 | 17권 1호 |
| 발표분야 | C. Energy and the Environment Technology(에너지 및 환경재료) |
| 제목 | Electronic Conductivity Enhancement of LiMnPO4 as a Cathode Electrode for Lithium Rechargeable Battery |
| 초록 | Lithium rechargeable batteries with high energy and power density are important for portable electronic devices, transportation and energy storage. In recent times, great interest has been focused toward the lithium metal phosphates as potential cathode materials due to better chemical and thermal stability. Among the lithium metal phosphates, LiFePO4 has been successfully optimized for high-power applications. On the other hand, LiMnPO4 cathode materials possess higher operating voltage, but, their rate capability is significantly lower. The three-dimensional framework of an olivine is stabilized by the strong covalent bonds between oxygen ions and the P5+ resulting in PO43− tetrahedral polyanions. In general, LiMnPO4 possess a low intrinsic electronic and ionic conductivity, and for this reason a reduced discharge rate capability was attained. The electrochemical performance is particularly lower at high current densities, this was suggested to the slow lithium diffusion kinetics within the grains and the low intrinsic electronic conductivity. Therefore, electronic conductivity enhancement contained with conductive carbon can prevail over these problems. In the present study, a solid state reaction was employed to prepare LiMnPO4 containing conductive carbon. XRD patterns of synthesized materials were identified as olivine LiMnPO4 with the space group of Pnma. The particle size and morphology of as-prepared sample were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM). The amount of conductive carbon has been found to be correlated to the electrochemical performance test. The electrochemical characterization results for the structure and morphology will be discussed in detailed. |
| 저자 | Chek Hai Lim, 이현욱, 문산, 김도경 |
| 소속 | KAIST |
| 키워드 | Energy storage; lithium ion battery; LiMnPO4 |
