Among the spinel oxides materials, lithium titanate (Li1+xTi2-xO4 where 0 ≤ x ≤ 0.33) could be very interested from pratical applications point of view. Lithium titanate is a II type spinel oxide superconductor with relatively high (~13 K for x = 0) superconducting transition temperature Tc. Above Tc lithium titanate shows metallic behaviour and can be used e.g. as electrodes for rechargeable lithium-ion batteries. Since the discovery of superconductivity in LTO by Johnston, many scientific attention have been devoted to improve the transition temperature by doping by other atoms. Substitution of Ti atoms in lithium titanate by for example Al, B, Cr, Ge, Mn, Ni or V have no effect in enhanced of Tc. As it was discovered, only Cu dopand gives hope to increase od transition temperature. Investigated samples were manufactured by sol – gel method. Lithium acetate dehydrate and titanum (IV) butoxide 97% were used as reagents. Additionaly copper (II) nitrate was used as a source of Cu dopant. XRD investigations showed lithium titanate spinel phase of manufactured samples. Patterns for samples with larger amount of Cu revealed a mixture of lithium titanate and copper oxide. Presence of the CuO in samples with excess of copper could be related with inability to substitute a larger number of titanium atoms.
Authors
Additional information
- Category
- Publikacja monograficzna
- Type
- rozdział, artykuł w książce - dziele zbiorowym /podręczniku w języku o zasięgu międzynarodowym
- Language
- angielski
- Publication year
- 2013
