Raman spectroscopic determination of phase evolutions in LiAlxCo1−xO2 battery materials
- 31 January 2001
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 16 (1) , 1-4
- https://doi.org/10.1557/jmr.2001.0001
Abstract
Superior battery materials LiAlxCo1−xO2 (x = 0.0, 0.1, 0.3, 0.5, and 0.7) were synthesized using a solution-based route at various sintering temperatures (450–800 °C). In this communication, we report on the use of Raman spectroscopy to study effect of composition and sintering temperature on the resulting material. The phase evolutions in LiAlxCo1−xO2 compositions were studied using micro-Raman spectroscopy and a phase diagram is proposed based on the observations. For less Al content, the low-temperature phases of LiAlxCo1−xO2 showed Raman spectra corresponding to a monoclinic (space group C2/m) structure, while a low-temperature spinel (space group Fd3m) phase was observed for 50% or more Al in these compounds. All these compositions exhibited a layered hexagonal (space group R3m) structure when sintered above 700 °C. Raman spectra also revealed residual Co3O4 in the low-temperature forms of LiCoO2 and LiA10.01Co0.9O2.Keywords
This publication has 16 references indexed in Scilit:
- Raman characterization of Li(Al1-xCox)O2Journal of Materials Research, 2000
- Phase Separation Tendencies of Aluminum‐Doped Transition‐Metal Oxides ( LiAl1 − x M x O 2 ) in the α ‐ NaFeO2 Crystal StructureJournal of the Electrochemical Society, 1999
- LiAl y Co1 − y O 2 ( R 3̄m ) Intercalation Cathode for Rechargeable Lithium BatteriesJournal of the Electrochemical Society, 1999
- Cathode materials for lithium rocking chair batteriesSolid State Ionics, 1996
- Effect of Mn-substitution for Co on the crystal structure and acid delithiation of LiMnyCo1−yO2 solid solutionsSolid State Ionics, 1994
- Solid‐State Redox Reactions of LiCoO2 (R3m) for 4 Volt Secondary Lithium CellsJournal of the Electrochemical Society, 1994
- Structure and electrochemistry of LixCryCo1−yO2Solid State Ionics, 1994
- Synthesis and electrochemistry of spinel LTLiCoO2Solid State Ionics, 1993
- The thermodynamic and thermoelectric properties of LixTiS2 and LixCoO2Solid State Ionics, 1984
- Study of Order-Disorder in Rock-Salt-Related Structures by Infrared SpectroscopyJournal of the American Ceramic Society, 1970