Nanocrystalline LiMn2O4 derived by HMTA-assisted solution combustion synthesis as a lithium-intercalating cathode material
| Autor: | T. Prem Kumar, G. Ting-Kuo Fey, Yung-Da Cho |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Materials science
Diffusion Inorganic chemistry Intercalation (chemistry) chemistry.chemical_element Condensed Matter Physics Electrochemistry Nanocrystalline material law.invention chemistry.chemical_compound chemistry law General Materials Science Lithium Calcination Crystallite Hexamethylenetetramine |
| Zdroj: | Materials Chemistry and Physics. 99:451-458 |
| ISSN: | 0254-0584 |
| DOI: | 10.1016/j.matchemphys.2005.11.022 |
| Popis: | Nanocrystalline LiMn2O4 was synthesized by a self-sustaining solution combustion method with hexamethylenetetramine as a fuel. Ammonium nitrate was used as an additional oxidant-and-porogen. Thermal analytical studies showed the formation of LiMn2O4 by a single-step decomposition process between 300 and 380 °C. The products were highly crystalline with an average crystallite size of ∼30 nm. Charge–discharge studies showed that the optimal heat treatment protocol was a 10 h calcination at 700 °C. A product obtained under these conditions from a precursor containing a 1:1 molar ratio of [LiNO3 + Mn(NO3)2] and NH4NO3 sustained 202 cycles between 3.0 and 4.3 V at a charge–discharge rate of 0.1 C before reaching an 80% charge retention cut-off value. Nanocrystalline particles provide small diffusion pathways that lead to an improvement in the lithium-ion intercalation kinetics and minimize surface distortions during cycling. These factors are believed to confer excellent electrochemical properties to the product. |
| Databáze: | OpenAIRE |
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