Free-standingsingle-walledcarbonnanotube/SnO 2 (SWCNT/SnO 2 ) anodepaper was prepared by vacuum filtration of SWCNT/SnO 2 hybrid material which was synthesized by the polyol method. From field emission scanning electron microscopy and transmission electron microscopy, the CNTs form a three-dimensional nanoporous network, in which ultra-fine SnO 2 nanoparticles, which had crystallite sizes of less than 5 nm, were distributed, predominately as groups of nanoparticles on the surfaces of singlewalled CNT bundles. Electrochemical measurements demonstrated that the anodepaper with 34 wt.% SnO 2 had excellent cyclic retention, with the high specific capacity of 454 mAh g −1 beyond 100 cycles at a current density of 25 mA g −1 , much higher than that of the corresponding pristine CNT paper. The SWCNTs could act as a flexible mechanical support for strain release, offering an efficient electrically conducting channel, while the nanosized SnO 2 provides the high capacity. The SWCNT/SnO 2 flexible electrodes can be bent to extremely small radii of curvature and still function well, despite a marginal decrease in the conductivity of the cell. The electrochemical response is maintained in the initial and further cycling process. Such capabilities demonstrate that this model hold great promise for applications requiring flexible and bendable Li-ion batteries. AbstractFree-standing single-walled carbon nanotube/SnO 2 (SWCNT/SnO 2 ) anode paper was prepared by vacuum filtration of SWCNT/SnO 2 hybrid material which was synthesized by the polyol method. From field emission scanning electron microscopy and transmission electron microscopy, the CNTs form a three-dimensional nanoporous network, with ultrafine SnO 2 nanoparticles, which had crystallite sizes of less than 5 nm, were distributed, predominately, as groups of nanoparticles on the surfaces of parallel packets or bunches of single walled CNTs. Electrochemical measurements demonstrated that the anode paper with 31 wt.% of SnO 2 had excellent cyclic retention, with the high specific capacity of 454 mAh g -1 beyond 100 cycles at a current density of 25 mA g -1 , much higher than that of the corresponding pristine CNT paper. The SWCNTs could act as a flexible mechanical support for strain release, offering an efficient electrically conducting channel, while the nanosized SnO 2 provides the high capacity. The SWCNT/SnO 2 flexible electrodes can be bent to extremely small radii of curvature, and still function well, despite a marginal decrease the conductivity of the cell. After bending, the conductivity of the cell is 4.8 × 10 -4 S·m -1 , which is slightly lower than that of the cell that was no subjected to bending (5.2 × 10 -4 S·m -1 ). The electrochemical response is maintained in the initial and further cyclingprocess. Such capabilities demonstrate this model hold great promise for application requiring flexible and bendable Li-ion batteries. 3 IntroductionThere has been more interest recently in flexible and bendable energy storage devices, especially in the field...

Highly flexible, binder-free, MoO3 nanobelt/graphene film electrode is prepared by a two-step microwave hydrothermal method. Graphene is first prepared by an ultra-fast microwave hydrothermal method and then mixed with MoO3 solution to synthesize the MoO3 nanobelt/graphene composite, which exhibits the combination of stacked graphene sheets and uniform MoO3 nanobelts with widths of 200-500 nm and lengths of 5-10 μm. The charge-discharge measurements show that the as-synthesized MoO3/graphene hybrid materials demonstrate excellent rate capability, large capacity, and good cycling stability compared to the pure MoO3 film. An initial discharge capacity of 291 mAh g-1 can be obtained at 100 mA g-1, with a capacity of 172 mAh g -1 retained after 100 cycles. The results show that the MoO 3/graphene designed in this study can be used as a free-standing cathode material in rechargeable bendable Lithium batteries. © 2012 Published by Elsevier B.V. All rights reserved.Keywords rapid, lithium, bendable, cathode, method, hydrothermal, microwave, films, graphene, moo3, free, synthesis, standing, batteries Disciplines Engineering | Science and Technology Studies Publication DetailsNoerochim, L., Wang, J., Wexler, D., Chao, Z. & Liu, H. (2013). Rapid synthesis of free-standing MoO3/ Graphene films by the microwave hydrothermal method as cathode for bendable lithium batteries. Journal of Power Sources, • A new method to synthesize high quality of MoO 3 nanobelts from commercial bulk.• Ultra-fast microwave hydrothermal method for fabrication MoO 3 /graphene films.• MoO 3 /graphene hybrid materials demonstrate good cycling stability as cathode. 3 IntroductionThe There are several reports on the hydrothermal synthesis of MoO 3 nanostructures to produce materials with high purity, homogeneity, good crystallinity, and unique properties [20,[38][39][40]. Microwave irradiation can be used as an alternative heat source for the 5 hydrothermal process [41,42]. It leads to a rapid heating to attain the desired temperature in a short time and increases the reaction kinetics compared to the conventional hydrothermal method. In a microwave-assisted hydrothermal reaction, the heating rate is extremely rapid, due to the dielectric property of the medium or solvent [41,42]. Recently, Phuruangrat et al. [43] reported MoO 3 nanowires 50 nm in diameter and 10-12 μm in length that were synthesized by the microwave assisted hydrothermal method with cetyl trimethylammonium bromide (CTAB) as the surfactant-template.Here, we present a new method to synthesize high quality MoO 3 nanobelts from commercial bulk MoO 3 without a surfactant-template and combine them with graphene via a two-step microwave hydrothermal method for fabrication of highly flexible free-standing MoO 3 /graphene films. The free-standing MoO 3 nanobelt/graphene films prepared by the above method followed by the vacuum filtration technique were investigated as a cathode material for bendable Lithium batteries and compared with MoO 3 nanobelt films prepared by a similar method ...

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The exponential growth in the production of electric vehicles requires an increasing supply of low-cost, high-performance lithium-ion batteries. The increased production of lithium-ion batteries raises concerns over the availability of raw materials, especially cobalt for batteries with nickel-rich cathodes, in which these constraints can impact the high price of cobalt. The reliance on cobalt in these cathodes is worrisome because it is a high-cost, rare material, with an unstable supply chain. This review describes the need and feasibility of developing cobalt-free high-nickel cathode materials for lithium-ion batteries. The new type of cathode material, LiNi1−x−yMnxAlyO2 promises a completely cobalt-free composition with almost the same electrochemical performance as that of the conventional high-nickel cathode. Therefore, this new type of cathode needs further research for its commercial applications.

Highly flexible, paper-like, free-standing V 2 O 5 and V 2 O 5 -polypyrrole (PPy) films were prepared via the vacuum filtration method. The films are soft, lightweight, and mechanically robust. The electrochemical performance of the free-standing pure V 2 O 5 electrode was improved by incorporating conducting polypyrrole. A bendable cell with a novel design was fabricated, consisting of a freestanding V 2 O 5 -PPy cathode film, gel electrolyte, and a lithium foil anode. The cell was tested under repeated bending conditions for several cycles. The results show that the battery performance of the repeatedly bent cell was similar to that of the conventional cell.

Inhibitor is a substance that is added to the corrosive media to inhibit corrosion rate. Organic inhibitors are preferred to inorganic ones since they are environmentally friendly. One of the organic compounds which is rarely reported as a corrosion inhibitor isMyrmecodia Pendans. The organic compounds can be adsorbed on the metal surface and block the active surface to reduce the rate of corrosion. In this study, the used pipe was carbon steel API 5L Grade B with 3.5% NaCl solution as the corrosion medium. The objective of this research was to analyze the inhibition mechanismMyrmecodia Pendanstowards carbon steel in a corrosion medium. Concentration variations of extractMyrmecodia Pendanswere 0–500 ppm. Fourier Transform Infrared (FTIR) was used for chemical characterization ofMyrmecodia Pendans. Polarization and Electrochemical Impedance Spectroscopy (EIS) were used to measure the corrosion rate and behaviour. From the electrochemical measurements, it was found that the addition of 400 mg/L inhibitor gave the highest inhibition efficiency.Myrmecodia Pendansacted as a corrosion inhibitor by forming a thin layer on the metal surface.

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