LiCoO[sub 2] Cathode Material That Does Not Show a Phase Transition from Hexagonal to Monoclinic Phase
- 1 January 2001
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 148 (10) , A1110-A1115
- https://doi.org/10.1149/1.1397772
Abstract
Structural instability of LiCoO2LiCoO2 can be improved by sol-gel coating of Al2O3Al2O3 and subsequent heat-treatments. While Al2O3Al2O3 phase does not exist after heat-treatments, solid solution LiCo1−xAlxO2LiCo1−xAlxO2 that has discretely higher Al concentration was formed at the surface up to ∼500 Å inside the particle. However, heat-treatment to 700°C results in the presence of the solid solution beyond ∼500 Å. The different Al concentration at the surface significantly affects the structural stability of the materials during cycling, and those prepared at 400°C do not show a phase transition from hexagonal to monoclinic phase. Disappearance of such a phase transition improves capacity retention of the cathode. Moreover, cathodes prepared at 400 and 500°C show improved layered characteristics with cation order. © 2001 The Electrochemical Society. All rights reserved.Keywords
This publication has 12 references indexed in Scilit:
- Novel LiCoO2 Cathode Material with Al2O3 Coating for a Li Ion CellChemistry of Materials, 2000
- Effect of Preparation Methods of LiNi1 − x Co x O 2 Cathode Materials on Their Chemical Structure and Electrode PerformanceJournal of the Electrochemical Society, 1999
- LiAl y Co1 − y O 2 ( R 3̄m ) Intercalation Cathode for Rechargeable Lithium BatteriesJournal of the Electrochemical Society, 1999
- TEM Study of Electrochemical Cycling‐Induced Damage and Disorder in LiCoO2 Cathodes for Rechargeable Lithium BatteriesJournal of the Electrochemical Society, 1999
- Improvement of Structural Stability of LiCoO[sub 2] Cathode during Electrochemical Cycling by Sol-Gel Coating of SnO[sub 2]Electrochemical and Solid-State Letters, 1999
- In Situ Observation of LiNiO[sub 2] Single-Particle Fracture during Li-Ion Extraction and InsertionElectrochemical and Solid-State Letters, 1999
- Cobalt dissolution in LiCoO2-based non-aqueous rechargeable batteriesSolid State Ionics, 1996
- Solid‐State Redox Reactions of LiCoO2 (R3m) for 4 Volt Secondary Lithium CellsJournal of the Electrochemical Society, 1994
- Electrochemical and In Situ X‐Ray Diffraction Studies of Lithium Intercalation in Li x CoO2Journal of the Electrochemical Society, 1992
- Structure and electrochemistry of lithium cobalt oxide synthesised at 400°CMaterials Research Bulletin, 1992