Nanosheet-structured vanadium pentoxide thin film as a carbon- and binder-free cathode for lithium-ion battery applications

Abstract

Vanadium pentoxide (V 2 O 5 ) nanosheet thin film without conductive additives and binders has been synthesized via sol-gel and liquid phase deposition methods on ITO glass substrate followed by heat treatment at 450°C. The SEM and TEM results showed that the as-deposited film presents an intertwined nanowire structure with a length of several micrometers and a width of dozens of nanometers, and it transformed into nanosheet-like crystalline orthorhombic V 2 O 5 after annealing. Possible formation process of the nanowired structure is briefly discussed. The analysis of XRD confirmed that the film exhibits a strong preferred orientation along c-axis. The Raman spectrum verified the layered structure of the film. The corresponding electrochemical performance tests indicated that the binder-and carbon-free film possesses comparable high specific capacity and good cyclic stability to the conventional electrodes, which manifests that this facile synthesized material is quite promising and it provides a low-cost alternative for lithium-ion battery applications.

Electrodeposited Structurally Stable V2O5 Inverse Opal Networks as High Performance Thin Film Lithium Batteries

“…In contrast to this the FTO-coated glass used in this study was quite thick (∼3 mm); consequently, after heating and cooling the IO structure maintains rigidity and electrical contact with the FTO current collector better than the stainless steel current collector, such that the semitransparent cathode exhibited a specific capacity of ∼190.88 mAh g −1 after 75 cycles. The specific capacity values obtained for V 2 O 5 IO samples on FTO-coated glass are greater than capacity values reported for several vanadium oxide nanostructures including nanourchins, nanobelts, and nanosheets . Structured porous electrodes that rearrange Li-accessible insertion regions to an excess electrolyte that ensures maximum lithiation during discharging can greatly improve the capacity retention and high cycle life electrode stability, provide much higher specific capacity (even for a porous material), and improve round-trip cycle efficiency in thin film lithium batteries.…”

“…The specific capacity values obtained for V 2 O 5 IO samples on FTO-coated glass are greater than capacity values reported for several vanadium oxide nanostructures including nanourchins, 69 nanobelts, 70 and nanosheets. 71 Structured porous electrodes that rearrange Li-accessible insertion regions to an excess electrolyte that ensures maximum lithiation during discharging can greatly improve the capacity retention and high cycle life electrode stability, provide much higher specific capacity (even for a porous material), and improve round-trip cycle efficiency in thin film lithium batteries.…”

Chemical Vapor-Deposited Vanadium Pentoxide Nanosheets with Highly Stable and Low Switching Voltages for Effective Selector Devices

“…To create high-performance selector devices that allow accurate information storage and retrieval, various TS materials have been investigated. Chalcogenide materials, such as Si and/or Ge-based As–Te thin films, show excellent TS features, but these materials require the fabrication of complex materials and experience thermal degradation after repeated cycling. ,, Additionally, volatile TS characteristics have been observed in thin films of metal-oxide materials, such as NbO 2 , VO 2 , and NiO 2 , which possess Mott-type metal-to-insulator transitions due to strongly correlated d-electrons. − V 2 O 5 has garnered attention because of its splendid potential for applications, such as electrochromic devices, optical switching devices, smart windows, and chemical gas sensors. − The chemically stable van der Waals layered structure of V 2 O 5 permits intercalation with active metal complexes, leading to research on reversible cathode materials for batteries. − Although the electrical properties of V 2 O 5 have received attention in several theoretical and experimental papers, − reports on its use in memory applications are rare …”

Metal-Organic Framework Fabricated V2O5 Cathode Material for High-Performance Lithium-Ion Batteries

“…For obtaining an enhanced electrochemical performance, higher electrode/electrolyte interfaces and a better accommodation ability of the strain upon volume change during lithiation/de-lithiation, nanostructured materials also possess advantages. Numerous nanostructured V 2 O 5 samples have been reported, such as nanoparticles [23], micro/nanosphere [24][25][26], nanosheets [27][28][29], nanorods [30], nanotubes [31] and nanowires [32], to alleviate the kinetic limitations when employed as a cathode material for LIB.…”