Magnetic phase transition of Li0.75CoO2 compared with LiCoO2 and Li0.5CoO2 |
| |
| Authors: | A Ito K Tanaka H Kawaji T Atake N Ando Y Hato |
| |
| Institution: | (1) Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan;(2) Materials and Structures Laboratory, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan;(3) Core Technology R&D Group, Subaru Technical Research Center, Fuji Heavy Industries Ltd., 3-9-6 Ohsawa, Mitaka 181-8577, Japan |
| |
| Abstract: | Magnetic and thermodynamic properties of the LiCoO2 positive-electrode material used in lithium-ion battery were first examined. Partially deintercalated LiCoO2 that is Li0.75CoO2, showed definite anomaly in the magnetic susceptibility at T=ca. 175 K probably related to magnetic phase transition which was supported by observation of a weak anomaly in heat capacity.
On the other hand, LiCoO2 did not show such magnetic phase transition as expected, whereas Li0.5CoO2 a weak one in the similar temperature range. These behaviors are discussed in association with the mixing of Co3+ and Co4+ electronic structures. |
| |
| Keywords: | electrochemical deintercalation heat capacity LiCoO2 magnetic phase transition |
| 本文献已被 SpringerLink 等数据库收录！ |
|
