A new charge density wave oxide, LiVMoO5, and its tungsten analogue obtained by topotactic reduction of LiVMO6 (M=Mo, W) brannerites

Much improved capacity and cycling performance of LiVMoO6 cathode for lithium ion batteries

“…4A were well spherical with uniform diameter size about 40 nm, which are loosely stacked with a porous state, providing high specific surface area. It is different with coarse-grained powders synthesized via high-temperature reactions [10][11][12] and sol-gel method [9] with a reaction time of no less than 24 h. That is, less energy is cost during the preparation process of power storage materials. Moreover, the physical features of this material are apparently controllable depending on the N 2 H 4 ·H 2 O solution used, which play a crucial role in the process of partial reduction, self-assembly and re-oxidation.…”

“…The long life cycling instability of brannerite cathode materials upon lithium insertion has been discussed by Cushing et al [10]. However, the structural arrangement of VO 6 octahedra play an important role in their ability to intercalate Li ions and gives a poor cycle performance for the deformation of structure [11][12]. A significant capacity fade during cycles shows the instability and the attempt to prepare LiVMoO 6 materials using different methods showed a limited success to improve the poor stability as well as reversible capacity at large currents [13].…”

“…In this paper, we introduced a novel route to synthesize spherical LiVMoO 6 nanocrystals using a solvothermal reaction method. The electrode properties of LiVMoO 6 as cathode for lithium ion batteries have been much improved with significant enhanced capacity as well as cycling stability at larger currents than those reported previously in literatures [9][10][11][12][13].…”

“…Sun). from a standpoint of the variety of oxidation states [9][10][11][12][13][14][15]. Michael et al [9] show low discharge capacity in the range of 3.0-4.5 V suggesting the presence of non-stoichiometric compounds with the presence of V 4+ or Mo 5+ ions differed substantially from monophasic LiVMoO 6 .…”

A NEW ANODE MATERIAL LiVMoO6 FOR USE IN RECHARGEABLE Li-ION BATTERIES

“…However, the XRD pattern of LiVMoO 6 reported by them was not indexed. On the other hand, Gopalakrishnan et al have shown that LiVMoO 6 as well as its reduced product, LiVMoO 5 , obtained by the solid-state reaction method can be identified by their XRD patterns [2]. Moreover, the authors performed many measurements on the physical properties of these materials.…”