Electrochemical Behavior of Vanadium Oxides in Chloride-Fluoride Melts

2019 ◽  
Vol 16 (49) ◽  
pp. 569-573
Author(s):  
Sergei Devyatkin
Keyword(s):  
Electrochemical Behavior ◽  
Vanadium Oxides ◽  
Fluoride Melts

Synthesis of Novel Vanadium Oxide Nanotubes and Nanofibers

2002 ◽  
Vol 740 ◽  
Author(s):  
Samuel T. Lutta ◽  
Hong Dong ◽  
Peter Y. Zavalij ◽  
M. Stanley Whittingham
Keyword(s):  
Thermal Analysis ◽  
Vanadium Oxide ◽  
Electrochemical Behavior ◽  
Redox Reactions ◽  
Sol Gel ◽  
Vanadium Oxides ◽  
Organic Polymer ◽  
Fibrous Morphology ◽  
Surfactant Templates ◽  
Vanadium Oxide Nanotubes

ABSTRACTWe are exploring the synthesis and properties of structured vanadium oxides mainly nanotubes and nanorods. Nanotubes initially formed with surfactant templates have been readily exchanged with simple cations without change of the basal-plane structure. These compounds contain d-like vanadium oxide layers with the vanadium in VO6 octahedra. This structure is particularly suitable for redox reactions. In this paper we report on synthesis of vanadium oxide, (NH4)xV2O5-d·nH2O rods using organic polymer as template. This compound has been synthesized by sol-gel reaction and subsequent hydrothermal treatment. TGA, SEM, XRD and FTIR were used to characterize this compound. Thermal analysis of this compound shows that the fibrous morphology is maintained when it is heated in nitrogen and oxygen above 300 °C. However, in both cases the size of the fibers decreases. Performance of this compound as cathode material in secondary electrolyte has been investigated using LiPF6 as electrolyte. A capacity of 140 mAh/g was obtained which remained fairly constant with up to at least 10 cycles. We also investigated electrochemical behavior of thermal products.

Electrochemical Behavior of Niobium Complexes in Chloride-Fluoride Melts with Addition of Alkaline Cations

2018 ◽  
Vol 86 (14) ◽  
pp. 69-80 ◽  
Author(s):  
Daria A. Vetrova ◽  
Anna V. Popova ◽  
Sergey A. Kuznetsov
Keyword(s):  
Electrochemical Behavior ◽  
Fluoride Melts ◽  
Alkaline Cations ◽  
Niobium Complexes

Synthesis and Characterization of Nickel and Manganese Vanadium Oxides

1998 ◽  
Vol 548 ◽  
Author(s):  
Fan Zhang ◽  
Peter Zavalij ◽  
M. Stanley Whittingham
Keyword(s):  
Electron Microprobe ◽  
Electrochemical Behavior ◽  
Vanadium Oxides ◽  
Synthesis And Characterization ◽  
Monoclinic Structure ◽  
Hydrothermal Reactions ◽  
Lithium Cells

ABSTRACTWe have synthesized novel nickel and manganese vanadium oxides using the hydrothermal reactions of vanadium(V) pentoxide, Ni(CH3COO)2, and MnSO4 with an organic templating cation at 165°C. The [NH2(CH2)2NH2]2NiV6O14 has a monoclinic structure. It has some disordered V and 0 atoms in the V6014 layer, which appear to be very close to each other with occupation factor around 0.5. The disordered model was decomposed for two ordered configurations, which differ in the stacking of the layers. The (Mn+2)6(Mn+3)l−2/3z(OH)3(1−Z)(VO4)3[(VO4)l−2z(v207)z] (Z≈0. 1) phase has a hexagonal pipe morphology. These compounds were also characterized by electron microprobe, FTIR and TGA. They reacted readily with lithium, and their electrochemical behavior in lithium cells was determined.

scholarly journals Electrochemistry of silicon in chloro-fluoride and carbonate melts

2003 ◽  
Vol 39 (1-2) ◽  
pp. 303-307 ◽  
Author(s):  
S.V. Devyatkin
Keyword(s):  
Carbon Dioxide ◽  
Electrochemical Behavior ◽  
Excessive Pressure ◽  
Ternary Compounds ◽  
Fluoride Melts ◽  
Carbon Dioxide Atmosphere ◽  
Boron Silicide

The electrochemical behavior of K2SiF6 in chloro-fluoride melts and that of SiO2 in carbonate melts has been studied. Silicon, titanium silicides, boron silicide and ternary compounds Ti-Si-B have been deposited from chloro-fluoride melts. Only SiC was deposited from carbonate-silica melts under carbon dioxide atmosphere (that is, excessive pressure of CO2).

Electrochemical Behavior of Vanadium Oxides in (NH2)2CO - KCl Melt

2013 ◽  
Vol 50 (11) ◽  
pp. 153-157
Author(s):  
A. V. Savchuk ◽  
S. V. Devyatkin
Keyword(s):  
Electrochemical Behavior ◽  
Vanadium Oxides

Electrochemical behavior of tantalum(V) oxide in chloride-fluoride melts

2007 ◽  
Vol 43 (2) ◽  
pp. 211-216
Author(s):  
N. A. Gasviani ◽  
M. Sh. Khutsishvili ◽  
L. M. Abazadze ◽  
S. G. Gasviani
Keyword(s):  
Electrochemical Behavior ◽  
Fluoride Melts

Vanadium Oxide Nanofibers and Vanadium Oxide Polyaniline Nanocomposite: Preparation, Characterization and Electrochemical Behavior

2003 ◽  
Vol 788 ◽  
Author(s):  
Samuel T. Lutta ◽  
Hong Dong ◽  
Peter Y. Zavalij ◽  
M. Stanley Whittingham
Keyword(s):  
Vanadium Oxide ◽  
Hydrothermal Treatment ◽  
Electrochemical Behavior ◽  
Lithium Battery ◽  
Sol Gel ◽  
Active Material ◽  
Vanadium Oxides ◽  
Rechargeable Lithium Battery ◽  
Mixed Carbonate ◽  
Polyaniline Nanocomposite

ABSTRACTThe sol gel reaction of NH4VO3 and polymethylmethacrylate (PMMA) template followed by hydrothermal treatment formed (NH4)xV2O5-Δ.nH2O rods. TGA, SEM, XRD and FTIR characterized this compound. Heating (NH4)xV2O5-Δ.nH2O in oxygen and nitrogen at 250 °C and 300 °C respectively resulted in the formation of vanadium oxides nanofibers of V3O7 and V2O5. Performance of these compounds as cathode in rechargeable lithium battery was investigated in a LiPF6/mixed carbonate electrolyte. The materials show good cycling with capacity greater than 130mAh/g, which translates to the insertion of 0.5 moles of Li+ per vanadium of the active material.

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