New Nanostructured Vanadium-Containing Cathode Materials for Lithium-Ion Rechargeable Batteries: Mechanochemical Synthesis and Properties
New nanostructured cathode materials based on vanadium - Li 3V 2(PO 4) 3, LiVPO 4F and their composites LiVPO 4F/Li 3V 2(PO 4) 3 were obtained by means of mechanochemically stimulated solid-phase synthesis. The crystal structure and electrochemical properties of the synthesized compounds were studied by means of XPA with refinement according to Rietveld and chronopotentiometry. It was demonstrated that Li 3V 2(PO 4) 3 is stably cycling within the voltage range 3.0-4.3 V, in particular at high current density. Improvement of the cathode characteristics of LiVPO 4F is promoted by obtaining composite materials LiVPO 4F/Li 3V 2(PO 4) 3 with nanodomain structure. The possibility to use LiVPO 4F in symmetric cells with the voltage of 2.4 V is demonstrated.