New Nanostructured Vanadium-Containing Cathode Materials for Lithium-Ion Rechargeable Batteries: Mechanochemical Synthesis and Properties
N. V. KOSOVA andВ В E. T. DEVYATKINA
Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Ul. Kutateladze 18, Novosibirsk 630128 (Russia)
E-mail: kosova@solid.nsc.ru
Keywords: lithium-ion rechargeable batteries, cathode materials, Li3V2(PO4)3, LiVPO4F, mechanical activation, crystal structure, cycling
Pages: 367–374
Abstract
By the mechanochemically stimulated solid-phase synthesis, new nanostructured cathode materials based on vanadium were obtained: Li3V2(PO4)3, LiVPO4F and their composites LiVPO4F/Li3V2(PO4)3. 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 Li3V2(PO4)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 LiVPO4F/Li3V2(PO4) 3 with nanodomain structure. The possibility to use LiVPO4F in symmetric cells with the voltage of 2.4 V is demonstrated.
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