Speaker
Mr
Sarawut Pongha
(Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)
Description
Lithium metal phosphate olivine (LiMPO${}_4$; M= Fe, Mn, Co, Ni) have a great deal of attention as one of the promising cathode material for lithium ion batteries. To date, a considerable number of studies have enhanced the electrochemical behavior of LiFePO${}_4$ from being barely electrochemically active to having a full capacity at high rates. Based on the success of LiFePO${}_4$, an increasing number of research groups have focused their attention on LiMnPO${}_4$, which exhibits an obvious advantage over LiFePO${}_4$ with a redox potential of 4.1 V VS Li/Li${}^+$. However, the LiMnPO${}_4$ kinetics is unusually sluggish due to its intrinsically low ionic and electronic conductivity. Many techniques, including to carbon coating, nano-sized using and aliovalent doping have been done to improve rate capability of this material. The doping of LiFePO${}_4$ with Cr${}^{3+}$ has been investigated in several previous studies which show an enhancement in conductivity and rate performance. However, the Cr-associated mechanism during charge/discharge is not yet revealed. Here, we report phase transition investigation of LiMn${}_{0.85}$Cr${}_{0.15}$PO${}_4$ cathode material by in-situ time-resolved XANES.
Authors
Dr
Nonglak Meethong
(Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)
Mr
Sarawut Pongha
(Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)
Co-authors
Dr
Sutham Srilomsak
(Nanotec-SUT Center of Excellence on Advanced Functional Nanomaterials, Suranaree University of Technology, Nakhon Ratchasima, THAILAND 30000)
Dr
Wanwisa Limpirat
(Synchrotron Light Research Institute, Nakhon Ratchasima, THAILAND 30000)
