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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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LiCoO2 cathode material that does not show a phase transition from hexagonal to monoclinic phase

Cited 91 times inthomson ciCited 132 times inthomson ci
Title
LiCoO2 cathode material that does not show a phase transition from hexagonal to monoclinic phase
Author
Cho, JaephilKim, YJPark, B
Keywords
RECHARGEABLE LITHIUM BATTERIES; R(3)OVER-BAR-M; INTERCALATION; DIFFRACTION; OXIDE
Issue Date
2001-10
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.148, no.10, pp.A1110 - A1115
Abstract
Structural instability of LiCoO2 can be improved by sol-gel coating of Al2O3 and subsequent heat-treatments. While Al2O3 phase does not exist after heat-treatments. solid solution LiCo1-xAlxO2 that has discretely higher Al concentration was formed at the surface, up to similar to 500 Angstrom inside the particle. However, heat-treatment to 700 degreesC results in the presence of the solid solution beyond similar to 500 Angstrom. The different Al concentration at the surface significantly affects the structural stability of the materials during cycling, and those prepared at 400 degreesC 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 degreesC show improved layered characteristics with cation order.
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DOI
10.1149/1.1397772
ISSN
0013-4651
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ECHE_Journal Papers
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