Synthesis and electrochemical performance of a LiMn1.83Co0.17O4 shell/LiMn2O4 core cathode material
| Autor: | Zhen-Fei Wu, Xin Liu, Jun-Chao Li, Dao-Lai Fang, Cui-Hong Zheng |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Process Chemistry and Technology Spinel Doping Shell (structure) Nanoparticle Core (manufacturing) Nanotechnology engineering.material Electrochemistry Cathode Lithium-ion battery Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Chemical engineering law Materials Chemistry Ceramics and Composites engineering |
| Zdroj: | Ceramics International. 40:8455-8463 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2014.01.056 |
| Popis: | A shell/core Co-incorporated LiMn 2 O 4 cathode material was synthesized by a facile modified sol–gel process, using highly dispersed Mn 3 O 4 nanoparticles as the Mn source. Structural characterization revealed that the shell layer, which was 5–10 nm thick, and composed of spinel LiMn 1.83 Co 0.17 O 4 , grew homogeneously on the spinel LiMn 2 O 4 core with a size of ~50 nm. Electrochemical results showed that electrochemical performance of the shell/core cathode material compared favorably with that of the Co-doped LiMn 2 O 4 counterparts. Also its rate capability and cycling performance were apparently superior to those of pristine LiMn 2 O 4 synthesized under the same conditions. The shell/core cathode material exhibited a discharge capacity of 127 mAh g −1 at a current rate of 0.5 C (where 1 C=148 mA g −1 ), and retained a capacity of 103 mAh g −1 at 10 C, showing 81% capacity retention. After 200 cycles at 1 C and 25 °C, it delivered a capacity of 123 mAh g −1 , retaining 98% of its initial capacity. After 100 cycles at 1 C and 55 °C, it showed a capacity of 118 mAh g −1 , preserving 94% of its initial capacity. Its excellent electrochemical performance along with the facile synthesis process allowed the shell/core cathode material to serve as a promising cathode for high-performance Li-ion batteries. |
| Databáze: | OpenAIRE |
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