A new low-temperature synthesis and electrochemical properties of LiV3O8 hydrate as cathode material for lithium-ion batteries

LiV3O8, synthesized from V2O5 and LiOH, by heating of a suspension Of V2O5 in a LiOH solution at a low-temperature (100-200 degrees), exhibits a high discharge capacity and excellent cyclic stability at a high current density as a cathode material of lithium-ion battery. The charge-discharge curve shows a maximum discharge capacity of 228.6 mAh g(-1) at a current density of 150 mA g(-1) (0.5 C rate) and the 100 cycles discharge capacity remains 215 mAh g(-1). X-ray diffraction indicates the low degree of crystallinity and expanding of inter-plane distance of the LiV3O8 phase, and scanning electronic microscopy reveals the formation of nano-domain structures in the products, which account for the enhanced electrochemical performance. In contrast, the LiV3O8 phase formed at a higher temperature (300 degrees C) consists of well-developed crystal phases, and coherently, results in a distinct reduction of discharge capacity with cycle numbers, Thus, an enhanced electrochemical performance has been achieved for LiV3O8 by the soft chemical method via a low-temperature heating process. (C) 2009 Elsevier B.V. All rights reserved.