Towards control over redox behaviour and ionic conductivity in LiTi2(PO4)(3) fast lithium-ion conductor
| Autor: | Anita Trenczek-Zając, Wojciech Zając, Mateusz Tarach |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics Intercalation (chemistry) Inorganic chemistry Optical spectroscopy chemistry.chemical_element 02 engineering and technology Superionic conductor 010402 general chemistry 01 natural sciences Redox Ion Transition metal Electrode potential Ionic conductivity Li-ion battery Dopant Metals and Alloys Electroceramics 021001 nanoscience & nanotechnology 0104 chemical sciences Electronic Optical and Magnetic Materials Absorption edge chemistry Chemical physics Ceramics and Composites Lithium 0210 nano-technology |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| Popis: | [EN] The location of redox couples in transition metal compounds is among the key factors that determine their applicability. AM2(PO4)3 NASICONs (A ¿ Na, Li; M ¿ Ti, Zr, Hf, Ge, Sn, Fe, ¿) form an intriguing group that feature fast ion diffusion and tunable reduction/oxidation potentials and can therefore find numerous applications. The present study focuses on the LiTi2(PO4)3 member of this family and the possibility of controlling its transport and redox properties. It highlights the close relationship between the modification of the crystal and band structures via substitutions in the Ti sublattice or intercalation with lithium and its redox behaviour as well as transport properties. The correlation between ionic conductivity and the position of the Ti4þ/Ti3þ redox potential is discussed. UV-VIS reflectance spectra revealed a significant impact of the type of dopant as well as the level of intercalation on the position of the fundamental absorption edge, indicating the possibility of modifying the electronic structure. In the case of some of the examined dopants (Nb, Sn, In), more complex interaction was observed, since they introduce their own redox activity, and thus enable the material's behaviour to be modified even further. This work was funded by the National Science Centre of Poland as part of the grant no. 2012/05/D/ST5/00472. |
| Databáze: | OpenAIRE |
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