Abstract
TiO2-coated LiMn2O4 cathode powders are prepared using an in situ spray pyrolysis process. The TiO2-coated LiMn2O4 powders have spherical aggregated structures of nanometer-sized primary particles. The mean sizes of the primary and secondary TiO2-coated LiMn2O4 powders are 55 and 880 nm, respectively. The transmission electron microscopy images of the LiMn 2O4 primary particles show a single-crystalline and well-faceted structure. The single-crystalline LiMn2O4 primary particles are uniformly coated with an amorphous TiO2 layer. An immediate reaction of titanium tetraisopropoxide with oxygen forms a small flame at the exit of an alumina tube located in the center part of a quartz reactor. Sudden collisions between TiO2 vapor and submicron-sized composite powders of the Li and Mn components occur to form the TiO 2-coated cathode powders. The discharge capacities of the TiO 2-coated LiMn2O4 cathode powders are 126 and 109 mAh g-1 in the first and 170 cycles at a current density of 1 C. The capacity retentions of the pure and TiO2-coated LiMn 2O4 powders are 69% and 86% of the initial capacity after 170 cycles.
Original language | English |
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Pages (from-to) | 625-630 |
Number of pages | 6 |
Journal | Journal of Power Sources |
Volume | 244 |
DOIs | |
Publication status | Published - 2013 |
Externally published | Yes |
Keywords
- Cathode material
- Lithium manganate
- Spray pyrolysis
- Surface coating
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering