To reduce high dissolution of manganese ions (Mn3+) into the electrolytes in lithium-ion batteries, causing severe capacity loss during storage and cycle, TiO2 is simply coated onto LiMn2O4 powders by the sol-gel method and investigated by various analytical techniques. Whereas the surface layer of TiO2 on LiMn2O4 powders is stable up to 600 °C, annealing at and above 700 °C induces the reaction of TiO2 surface layer with LiMn2O4 host particle. The passive TiO2 layer on LiMn2O4 annealed at 500 °C effectively suppress Mn dissolution at room temperature and even higher temperature (55 °C). Moreover, TiO2-coated LiMn2O4 annealed at 500 °C improves the cycle property at high voltage of 4.50 V charging and even at high temperature. Hence, TiO2-coated LiMn2O4 can be a promising candidate of cathode active material for lithium-ion batteries.
|Number of pages
|Journal of Ceramic Processing Research
|Published - 2015
Bibliographical notePublisher Copyright:
© 2015, Hanyang University. All rights reserved.
- Mn dissolution
- Surface modification
ASJC Scopus subject areas
- Ceramics and Composites