LiNi0.6Co0.4-zTizO2 - New cathode materials for Li-ion batteries
| Autor: | Gabriela Wazny, Magdalena Ziąbka, Piotr Paziak, Janina Molenda, Dominika Baster |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Rietveld refinement Oxide Analytical chemistry chemistry.chemical_element 02 engineering and technology General Chemistry Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences Cathode 0104 chemical sciences Ion law.invention chemistry.chemical_compound chemistry Electrical resistivity and conductivity law General Materials Science 0210 nano-technology Titanium |
| Zdroj: | Solid State Ionics. 320:118-125 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/j.ssi.2018.03.002 |
| Popis: | In this work series of LiNi0.6Co0.4−zTizO2 (z = 0.1, 0.2, 0.3) new cathode materials for lithium-ion batteries were studied in terms of their structural, transport and electrochemical properties in Li/Li+/LixNi0.6Co0.4−zTizO2 cells. The materials were synthesized by a high temperature solid-state reaction. XRD measurements with Rietveld analysis confirmed presence of a single phase with hexagonal crystal system with R-3 m space group for LiNi0.6Co0.3Ti0.1O2, and LiNi0.6Co0.2Ti0.2O2. Except for composition LiNi0.6Co0.1Ti0.3O2, which was refined by Rietveld method as cubic-close-packed structure. Electrical conductivity shows thermally activated character for all obtained cathode materials with very low activation energy in range from 0.001 eV to 0.062 eV. The highest values of electrical conductivity were recorded for LiNi0.6Co0.1Ti0.3O2 oxide. With increasing titanium content in LiNi0.6Co0.4−zTizO2 (z = 0.1, 0.2, 0.3) the increase of electrical conductivity was observed. Electrochemical studies performed for Li/Li+/LixNi0.6Co0.4−zTizO2 cell revealed enhancement of electrochemical performance after replacement of Co ions with 0.1 mol of Ti ions. The highest discharge capacity equal to 100 mAh/g at C/20 discharge rate, together with high stable voltage around ~4.2 V was achieved for LiNi0.6Co0.3Ti0.1O2 composition. Among considered cathode materials, LiNi0.6Co0.3Ti0.1O2 is the most promising for further development. |
| Databáze: | OpenAIRE |
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