Electrochemical properties of nanometer-sized 0.6Li2MnO3·0.4LiNi0.5Mn0.5O2 composite powders prepared by flame spray pyrolysis
| Autor: | Seung Ho Choi, Jung Hyun Kim, Mun Yeong Son, Yun Chan Kang, Jung-Kul Lee, Min Ho Kim |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Process Chemistry and Technology Composite number Crystal structure Electrochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Phase (matter) Materials Chemistry Ceramics and Composites Nanometre Composite cathode Composite material Thermal spraying Pyrolysis |
| Zdroj: | Ceramics International. 39:331-336 |
| ISSN: | 0272-8842 |
| Popis: | Nanometer-sized 0.6Li2MnO3·0.4LiNi0.5Mn0.5O2 composite cathode powders are prepared directly by high-temperature flame spray pyrolysis. The precursor powders and the powders post-treated at 800 °C exhibit mixed-layered crystal structures comprising layered Li2MnO3 and layered LiNi0.5Mn0.5O2 phases. The discharge capacity of the precursor powders decreased from 193 mAh g−1 to 96 mAh g−1 by the 9th cycle, corresponding to a capacity retention of 49.7%. Post-treatment at 800 °C increases the capacity retention of the post-treated composite powders to 94.6% after 50 cycles, corresponding to a decrease in the discharge capacity from 225 to 213 mAh g−1. The post-treated composite powders that contain a high amount of the Li2MnO3 phase have a high initial discharge capacity and good cyclability. |
| Databáze: | OpenAIRE |
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