Substrate-Assisted Self-Organization of Radial β-AgVO₃Nanowire Clusters for High Rate Rechargeable Lithium Batteries

Abstract

Rational assembly of unique complex nanostructures is one of the facile techniques to improve the electrochemical performance of electrode materials. Here, a substrate-assisted hydrothermal method was designed and applied in synthesizing moundlily like radial β-AgVO(3) nanowire clusters. Gravitation and F(-) ions have been demonstrated to play important roles in the growth of β-AgVO(3) nanowires (NWs) on substrates. The results of cyclic voltammetry (CV) measurement and X-ray diffraction (XRD) characterization proved the phase transformation from β-AgVO(3) to Ag(1.92)V(4)O(11) during the redox reaction. Further electrochemical investigation showed that the moundlily like β-AgVO(3) nanowire cathode has a high discharge capacity and excellent cycling performance, mainly due to the reduced self-aggregation. The capacity fading per cycle from 3rd to 51st is 0.17% under the current density of 500 mA/g, which is much better than 1.46% under that of 20 mA/g. This phenomenon may be related to the Li(+) diffusion and related kinetics of the electrode. This method is shown to be an effective and facile technique for improving the electrochemical performance for applications in rechargeable Li batteries or Li ion batteries.

Soft chemical in situ synthesis, formation mechanism and electrochemical performances of 1D bead-like AgVO3 nanoarchitectures

“…Han and co-workers 15 reported the moundlily like β-AgVO 3 nanowires show the capacity of about 95 mAh·g -1 under the current density of 100 mA·g -1 of 100 mA·g -1 , the capacity of our nanoarchitectures sample (127 mAh·g -1 ) is higher than that of the samples previously reported. Its capacity decreases to 75 mAh·g -1 after 50 cycles under the current density of 100 mA·g -1 , and its capacity fading per cycle from 6th to 50th is 0.55%.…”

“…For example, nanostructures used as energy storage materials exhibit good electrochemical properties because of their shortened diffusion paths and increased contact areas between the electrolyte and the electrode for Li + insertion/extraction. 15 It is generally accepted that the smaller the particles is, meaning higher specific surface area and closer interfaces of particles, the smaller the electron transport resistance and the shorter diffusion paths are, which benefit for improving the storage capacity and the electrical conductivity of β-AgVO 3 as cathode materials. Especially, β-AgVO 3 is suited for application in implantable medical devices, 21,22 due to its higher Ag/V molar ratio, higher discharge capacity, and long-term chemical and structural stability.…”

In-situ preparation of Fe2O3 hierarchical arrays on stainless steel substrate for high efficient catalysis

“…Meanwhile, F − ions can selectively adsorb specific plane of the crystal, as a director of crystal growth, beneficial to the formation of specific morphologies, and hence guide self-assembly of the crystallites [29]. To be noted that the existence of F − ions can enhance the mechanical adhesion of the array film to the stainless steel substrate, which has been confirmed by other reports [30][31][32]. Without adding NH 4 F, we find that the obtained film is easy to break away from the substrate when rinsed by deionized water.…”

Single crystalline flowerlike α-MoO3 nanorods and their application as anode material for lithium-ion batteries

“…The initial discharge capacity of the aMoO 3 NRs is approximately 1182 mAh g À1 , even higher than the theoretical capacity of MoO 3 (1117 mAh g À1 ), presumably due to some irreversible reactions such as the formation of a solid electrolyte interface (SEI) layer [51], or may be associated with MoO 3-x phase [52]. The other reason is that the self-aggregation is reduced owing to the existence of the moundlily nanostructure [50]. The capacity loss (0.55%) of the initial cycle may be mainly endorsed to the irreversible reduction of MoO 3 to Mo, the decomposition of electrolyte, and formation of SEI, which are common for most cathode and anode materials [53e55].…”

“…The redox couple is close and the CV curves overlap in the next cycles. This can be clarified based on the overpotential theory [50], indicating good reversibility of Li þ insertion/extraction in the Van der Waals spacing of the flowerlike a-MoO 3 NRs. The separation between the redox couple is small and the CV curves for the second and third scans generally overlap, suggesting the good reversibility of lithium ion intercalation/de-intercalation in the flowerlike a-MoO 3 NRs.…”