Aqueous Solution Process for the Synthesis and Assembly of Nanostructured One-Dimensional α-MoO₃ Electrode Materials

Abstract

A low-temperature aqueous solution synthesis of nanostructured one-dimensional (1D) molybdenum trioxide (MoO3) was developed. The subsequent self-assembly of the fibers to form large-scale freestanding films was achieved without any assistance of organic compounds. Indeed, the whole process, from synthesis to assembly, does not require toxic organic solvents. As an example of the application of our synthesized materials, we built two types of half-cell lithium-ion batteries: (i) the cathode made out of 1D MoO3, having the width in 50–100 nm, with the length in micro scale, and with thickness in ∼10 nm, and (ii) the anode made out of the macroscopic oxide papers consisting of 1D MoO3 and carbon materials. As a cathode material, 1D MoO3 showed a high rate capability with a stable cycle performance up to 20 A g–1 as a result of a short Li+ diffusion path along the [101] direction and less grain boundaries. As an anode material, the composite paper compound showed a first specific discharge capacity of 800 mAh g–1. These findings indicate not only an affordable, eco-efficient synthesis and assembly of nanomaterials but also show a new attractive strategy toward a possible full aqueous process for a large-scale fabrication of freestanding oxide paper compounds without any toxic organic solvent.

Enhanced electrochemical performances of MoO2 nanoparticles composited with carbon nanotubes for lithium-ion battery anodes

“…Among them, molybdenum oxides such as MoO3 6-8 and MoO2 [9][10][11] have attracted extensive attention due to their high theoretical capacities (1117 mAh g -1 for MoO3, and 838 mAh g -1 for MoO2), high electrochemical activity, suitable lithium reaction voltage, and affordable cost. 9,12 To maintain the integrity of anode structure, the employment of nano-structured metal oxides is an efficient approach to relieve the stress-strain generated during the lithiation/delithiation processes. 9,12 To maintain the integrity of anode structure, the employment of nano-structured metal oxides is an efficient approach to relieve the stress-strain generated during the lithiation/delithiation processes.…”

Self‐Assembly Approach for Synthesis of Nanotubular Molybdenum Trioxide/Titania Composite Anode for Lithium‐Ion Batteries

“…Moreover, this value is even higher that of the macroscopic MoO 3 papers formed by one‐dimensional α‐MoO 3 nanorods (ca. 200 mAh g −1 cycled at 100 mA g −1 until the 20th cycle) . The discharge capacity of the MoO 3 ‐76 %‐TiO 2 composite was 374.9 mAh g −1 at a higher current density of 500 mA g −1 (as shown below), which was slightly higher than that of the Mo 6+ ‐doped‐TiO 2 /MoO 3 nanocomposite prepared by a rapid flame‐spray pyrolysis route (365.9 mAh g −1 ) .…”

Festkörperchemie 2013

“…Anstatt es bei hohen Temperaturen mit Reaktivgasen umzusetzen, strukturieren Sakaushi et al29 dieses Oxid bei niedrigen Temperaturen, um ein papierartiges Material zu erhalten. Aus wässrigen Lösungen von Na2MoO4·2 H2O erhielten die Autoren MoO3 als eindimensionale Fasern.…”