Electrochemical and structural investigations of different polymorphs of TiO2 in magnesium and hybrid lithium/magnesium batteries
| Autor: | Aleksandr Missiul, Vanessa Trouillet, Sonia Dsoke, Helmut Ehrenberg, Michael Knapp, Natalia Bramnik, D. Mikhailova, Raheleh Azmi, Angelina Sarapulova, Qiang Fu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Anatase
Reaction mechanism Materials science Magnesium General Chemical Engineering chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Nanocrystalline material 0104 chemical sciences chemistry Chemical engineering 0210 nano-technology Polarization (electrochemistry) Solid solution |
| Zdroj: | Electrochimica Acta. 277:20-29 |
| ISSN: | 0013-4686 |
| Popis: | Commercial nanocrystalline TiO2 anatase and self-prepared TiO2(B) bronze synthesized by hydrothermal method were used as the cathode materials for Mg-ion and hybrid Li/Mg-ion batteries. The TiO2 anatase delivers high initial discharge/charge capacities of 225 mAh g−1/204 mAhg−1 in a mixture of Phenylmagnesium chloride-AlCl3/LiCl in tetrahydrofuran (APC/LiCl) hybrid electrolyte, while the TiO2(B) shows high initial discharge/charge capacities of 260 mAh g−1/231 mAh g−1 in the same hybrid electrolyte. Low discharge capacities of 67 and 57 mAh g−1 and strong polarization are observed for both TiO2 anatase and TiO2(B) samples in pure APC electrolyte, respectively. In situ synchrotron diffraction strongly identifies that in APC/LiCl hybrid electrolyte, the TiO2 anatase undergoes structural evolution via a solid solution and a two-phase reaction mechanism, while TiO2(B) exhibits a solid solution reaction during the discharge-charge processes. The analysis of X-ray photoelectron spectra for the TiO2 anatase and TiO2(B) cathodes in the discharged/charged states reveals a change of Mg/Ti as well as Li/Ti ratios at different stages, which may indicate a contribution of both Mg and Li to the charge storage mechanism in the hybrid electrolyte. |
| Databáze: | OpenAIRE |
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