Synthesis of MnV 2O 6 under autogenous hydrothermal conditions and its anodic performance

Abstract

Anhydrous crystalline powders of MnV 2O 6 (brannerite) were successfully precipitated from mixed aqueous solution of Mn(CH 3COO) 2 and V 2O 5 with a metal ion concentration of 0.01–1.0 mol/l at 135–200 °C under autogenous hydrothermal condition in a closed vessel. The characterization of MnV 2O 6 synthesized was carried out by XRD, TG, TEM and anodic performance measurement. In case of mixtures with a concentration of 0.1–1.0 mol/l, single phase anhydrous crystalline MnV 2O 6 with homogeneous thin rod-like particles were synthesized by autogenous hydrothermal process, though starting reagent V 2O 5 was not fully dissolved. They showed high anodic performance in lithium ion batteries; high charge capacity as 600 mA h/g even after the 10th cycle and stable cyclic performance. MnV 2O 6 powders synthesized from relatively high concentration of metal ions showed an abrupt increase in charge capacity after third or fourth discharge/charge cycles, though the first cycle showed rather high irreversible capacity.