Preparation, structure and electrical properties of Li_1+4xTi_2-xNb_yP_3-yO₁₂(x= 0.1, 0.2, 0.3;y= 0, 0.1, 0.2, 0.3) ceramics

Abstract

The solid electrolyte compounds of Li1+4xTi2−xNbyP3−yO12 (x = 0.1, 0.2, 0.3; y = 0, 0.1, 0.2, 0.3) were synthesized by a solid state reaction and studied by X-ray diffraction from the powder. At room temperature all of the compounds display the hexagonal symmetry (space group R3c) with six formula units in the unit cell. The values of the binding, splitting energies and amounts of elements of Ti 2p, Nb 3d, P 2p, O 1s, and Li 1s core level of the ceramics' surfaces have been determined by XPS. Impedance spectroscopy of the ceramics has been performed in the frequency range of 10-3·109 Hz in the temperature interval 300-600 K. The insertion of niobium into the host compound Li1.4Ti1.9P3O12 leads to the changes of the value of ionic conductivity and its activation energy for the new ceramics.

Synthesis and research of electrode and solid electrolyte materials for lithium ion batteries

“…The lattice parameters, unit cell volume (V), theoretical density (d x-ray ) and formula units in the lattice (Z) of the investigated compounds are presented in Table 2.2. The relative density of the ceramics was found to be 94 % of the theoretical density [12]. The amounts of up to 0.8 wt.…”

Equivalent circuit models and analysis of impedance spectra of solid electrolyte Na0.25Li0.75Zr2(PO4)3

“…However, the conductivity of the base compound NaZr 2 (PO 4 ) 3 has been reported to be very low, below the applicable range and has poor sinterability [20]. Thus most studies have been carried out on partial as well as full substitutions of Na, Zr and P by higher valent elements of different radii [21][22][23] in order to improve the conductivities of the compositions. Such substitutions have lead to an enhancement of electrical conductivity [24,25].…”