Nano-sized copper tungstate thin films as positive electrodes for rechargeable Li batteries

Taguchi method assisted optimization of electrochemical synthesis and structural characterization of copper tungstate nanoparticles

“…Furthermore, it has been explained [17] that the atoms of copper and tungsten in the CuWO 4 crystal create the sequential layers located between the oxygen sheets. Thus, the infinite zigzag chains are formed by edge-sharing WO 6 and CuO 6 octahedra alternatively.…”

“…Several physical or chemical synthesis routes, i.e., deposition by spray [18], deposition via pulsed laser [19], radio-frequency assisted sputtering deposition [20], sol-gel method [21], fabrication in solidphase [22], surfactant aided precipitation [23] and fabrication in polyol-media [24] have been utilized for the preparation of different morphologies of copper tungstate nanoparticles, i.e., nanofilm, nanosphere, and porous film. These methods have own advantages; however, each of them suffers from some restrictions such as requiring for the strictly controlled synthesis media, high synthesis costs, and complexities in the synthesis reaction.…”

“…Copper tungstate has attracted substantial interest during recent years, because this material could be used in various important areas of science and technology such as scintillation detectors, optical fibers, photoanodes, laser host, sensors, photoelectrolysis electrodes, and positive electrode preparation for lithium based rechargeable batteries [1][2][3][4][5][6][7][8]. Up to now several researches about the crystal growth [9,10], photoelectrochemical performance [10], electrochemical, optical, electrical, magnetic, and ferroelectric behaviors [1,5,[11][12][13][14][15] of the copper tungstate have been published.…”

First-principles calculations and X-ray spectroscopy studies of the electronic structure of CuWO4

“…Therefore, Table 1 Lattice parameters of copper tungstate, CuWO4, as determined by different authors (triclinic structure, space group P1). different routes are applied for obtaining high-quality CuWO 4 in the form of bulk crystals (e.g., slow-cooled indirect flux reaction technique [17,18], recrystallization in an ampoule for chemical vapour transport [19]), films on different substrates (e.g., spray-sol-gel deposition [20], radio-frequency (RF) sputtering deposition [21]) or nanocrystalline powders possessing poor agglomeration of crystallites [22]. When measuring electrical conduction of a single-crystal copper tungstate, Bharati et al [23] have shown that CuWO 4 is an intrinsic semiconductor with the band gap, E g , 1.52 eV.…”

Ab initio LCAO study of the atomic, electronic and magnetic structures and the lattice dynamics of triclinic CuWO4

“…The all-solid-state thin-film lithium batteries, which are based on the nano-sized CuWO 4 positive electrode as proposed in [13], show a high-volume rate capacity in the first discharge and lack the unfavourable electrochemical degradation, observed in liquid electrolyte systems [13].…”