Structure and conductivity of lithiated vanadates LiMVO₄(M = Mn, Co, Ni)

Impedance, dielectric and modulus analyses of compounds LiMnVO4and LiCuVO4

“…34 The lower hopping rates of LiCuVO 4 compared with those of LiMnVO 4 are explained by the fact that LiCuVO 4 has more densely packed crystal structure with narrow bottlenecks and without obvious well defined conduction pathways. 13,14,22,27,29 This difference in structure is also reflected in the two materials' different activation energy values as is commented below. Using the EQUIVCRT.PAS 35 program, the results of the LiMnVO 4 impedance measurements were fitted, and the equivalent circuits that fit the measurement results were drawn from room temperature to 500uC at 25uC steps, as it is shown representatively in Fig.…”

“…LiMnVO 4 belongs to the Na 2 CrO 4 orthorhombic structure (S.G. C mcn ). In this structure, chains of edge shared MnO 6 octahedra running parallel to the c axis are bridged by antiparallel pairs of edge shared LiO 4 and VO 4 tetrahedra 29. In Ref.…”

“…Structural analysis on LiMnVO 4 has been reported in Refs. [23][24][25][26][27][28][29]. LiMnVO 4 belongs to the Na 2 CrO 4 orthorhombic structure (S.G. Cmcn).…”

“…In this structure, chains of edge shared MnO 6 octahedra running parallel to the c axis are bridged by antiparallel pairs of edge shared LiO 4 and VO 4 tetrahedra. 29 In Ref. 24, it is reported that the orthorhombic phase LiV[Mn]O 4 is transformed under pressure into the cubic spinel V[LiMn]O 4 structure.…”

High Voltage Cathode Materials

“…The conventional method, i.e. solid-state reaction, provides big crystallite size and poor stoichiometry [124][125][126]. Fey et al [127] prepared samples by reacting LiNiO 2 precursor and V 2 O 3 or V 2 O 5 in air at 700°C for 2 h. Wet-chemical synthesis techniques include sol-gel route [126][127][128], gel-combustion synthesis [127,129,130], combustion synthesis using gelatine as fuel [131], sol-gel via citrate [132], sol-gel via oxalate [133], glycerol-assisted gel combustion synthesis [129], starch-assisted combustion method [78], urea-assisted combustion synthesis [134], precipitation method [135], aqueous glycine-nitrate combustion process [122].…”