Characteristics of stabilized spinel cathode powders obtained by in-situ coating method
| Autor: | Hyung Bok Lee, Young Jun Hong, Yun Chan Kang, Jung-Kul Lee, Mun Yeong Son, Seong Ho Lee |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Spinel Composite number Metallurgy Energy Engineering and Power Technology engineering.material Cathode law.invention Amorphous solid Surface coating Coating Chemical engineering law Transmission electron microscopy engineering Electrical and Electronic Engineering Physical and Theoretical Chemistry Quartz |
| Zdroj: | Journal of Power Sources. 244:625-630 |
| ISSN: | 0378-7753 |
| Popis: | TiO 2 -coated LiMn 2 O 4 cathode powders are prepared using an in situ spray pyrolysis process. The TiO 2 -coated LiMn 2 O 4 powders have spherical aggregated structures of nanometer-sized primary particles. The mean sizes of the primary and secondary TiO 2 -coated LiMn 2 O 4 powders are 55 and 880 nm, respectively. The transmission electron microscopy images of the LiMn 2 O 4 primary particles show a single-crystalline and well-faceted structure. The single-crystalline LiMn 2 O 4 primary particles are uniformly coated with an amorphous TiO 2 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 TiO 2 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 LiMn 2 O 4 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 TiO 2 -coated LiMn 2 O 4 powders are 69% and 86% of the initial capacity after 170 cycles. |
| Databáze: | OpenAIRE |
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