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Hydrothermal Synthesis And Characterization Of Novel Vanadium Oxides And Their Application As Cathodes In Lithium Secondary Batteries
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Book Synopsis Hydrothermal Synthesis and Characterization of Novel Vanadium Oxides and Their Application as Cathodes in Lithium Secondary Batteries by : Thomas G. Chirayil
Download or read book Hydrothermal Synthesis and Characterization of Novel Vanadium Oxides and Their Application as Cathodes in Lithium Secondary Batteries written by Thomas G. Chirayil and published by . This book was released on 1998 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Novel Manganese and Vanadium Oxides as Cathodes for Lithium Rechargeable Batteries by : Rongji Chen
Download or read book Synthesis and Characterization of Novel Manganese and Vanadium Oxides as Cathodes for Lithium Rechargeable Batteries written by Rongji Chen and published by . This book was released on 1998 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low Temperature Synthesis and Characterization of Novel Transition Metal Vanadium Oxides and Manganese Oxides as Cathodes for Lithium Batteries by : Fan Zhang
Download or read book Low Temperature Synthesis and Characterization of Novel Transition Metal Vanadium Oxides and Manganese Oxides as Cathodes for Lithium Batteries written by Fan Zhang and published by . This book was released on 1999 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrothermal Synthesis and Characterization of Vanadyl Phosphate Based Cathode Materials for Lithium Ion Batteries by : Youngmin Chung
Download or read book Hydrothermal Synthesis and Characterization of Vanadyl Phosphate Based Cathode Materials for Lithium Ion Batteries written by Youngmin Chung and published by . This book was released on 2016 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Nano-scale Vanadium Oxides, Vanadium Phosphates as Cathodes for Lithium Batteries by : Chunmei Ban
Download or read book Synthesis and Characterization of Nano-scale Vanadium Oxides, Vanadium Phosphates as Cathodes for Lithium Batteries written by Chunmei Ban and published by ProQuest. This book was released on 2008 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrothermal Synthesis and Characterization of Vanadium and Tungsten Oxide Containing Organic-inoganic Hynrid Material by : Banu Önen
Download or read book Hydrothermal Synthesis and Characterization of Vanadium and Tungsten Oxide Containing Organic-inoganic Hynrid Material written by Banu Önen and published by . This book was released on 2011 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrothermal synthesis of transition metal oxide containing organic-inorganic hybrid materials has attracted great attention recently. Two novel organic-inorganic hybrid materials (4,4ʼ-bipy)3[HPW12O39] and [Cu(4,4ʼ-bipy)4][HPW12O40] were hydrothermally synthesized as green and purple crystals respectively, from the reaction of Na6[H2W12O40], CuCl2.2H2O, 4,4ʼ- bipyridine and H3PO4 in a 23 ml autoclave at 170°C for 72 hours. The compound (4,4ʼ-bipy)3[HPW12O39] crystallizes in the space group P21/n of the monoclinic system with four formula units in a cell with dimensions a = 13.503(3) Å, b = 26.726(5) Å, c =15.169(3) Å and V = 5397.3(19) Å3. [Cu(4,4ʼ-bipy)4][HPW12O40] crystallizes in the space group Pbcn of the tetragonal system with eight formula units in a cell of dimensions a = 20.236(4) Å, b = 25.635(5) Å, c = 20.236(4) Å; V = 10497(4) Å3 . Both of the compounds are Keggin polyoxometalate structures. (4,4ʼ-bipy)3[HPW12O39] contains free 4,4ʼ-bipy groups among the clusters while in [Cu(4,4ʼ-bipy)4][HPW12O40] 4,4ʼ-bipy ligands are coordinated to Cu2+ ions. A novel compound (H2NC4H8NH2)[(VO)2(PO4)2] was synthesized hydrothermally from the reaction of NaVO3, V2O5, ethylenediamine and H3PO4 at 170 C for 72 hours. The compound crystallizes in the space group P-1 of the trigonal system with five formula units in a cell of dimensions a= 6.3345(13) Å, b= 6.3353(13) Å, c= 15.940(3) Å, V=639.6(2) Å3. (H2NC4H8NH2)[(VO)2(PO4)2] displays a layered structure with protonated piperazine groups between layers. In addition to the novel compounds, several known compounds were synthesized as well. Blue crystals of (VO)(H2PO4)2 were obtained hydrothermally from the reaction of NaVO3, ethylenediamine and H3PO4 at 170C for 72 hours (C5NH6)4.5(H3O)1.5[P2W18O62] , a known compound also, was synthesized from the reaction of Na2WO4 .2H2O, CuCl2.2H2O, pyridine and H3PO4 at 170C for 72 hours.
Book Synopsis Hydrothermal Synthesis and Characterization of Transition Metal Oxides by : Aytaç Şahin
Download or read book Hydrothermal Synthesis and Characterization of Transition Metal Oxides written by Aytaç Şahin and published by . This book was released on 2004 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrothermal method has proven to be an excellent method for the synthesis of novel metal oxides and vanadates. This research pertains to the synthesis of novel lead chlorovanadate compound and of a known alkali metal trivanadate compound, KV3O8 by hydrothermal method This method has been used to synthesize many inorganic oxide compounds Hydrothermal synthesis is the use of aqueous solvents under high temperature and high pressure to dissolve and recrystallize materials. Compounds with interesting structure and physical properties are often obtained from this technique that is known as one of the low-temperature synthesis techniques for solid state compounds. There are many studies that have been done on oxides in the Pb-V-O systems There are also many vanadium oxides containing Pb, V, O elements in Pb-V-O system such as Pb1.32V8.35O16.7, PbV6O11, PbV2O6, Pb2V3O8.5, and .-PbxV2O5 bronzes (x = 0.3). In an attempt to synthesize vanadium oxides at low temperature, we were able to obtain needle shaped yellow crystals of PbVO3Cl. In the nature, there is a kombatite mineral, Pb14(VO4)2O9Cl4, with the same composition of elements. A new lead chlorovanadate, PbVO3Cl, was obtained from the reaction of NaVO3 and PbCl2 in aqueous solution of B(OH)3. The compound was prepared in an autoclave that was filled with aqueous solution of B(OH)3 and heated at 170oC for 3 days. The compound crystallizes in the space group Pnma of the orthorhombic system with formula units in a cell of dimensions a = 10.022(2)
Book Synopsis Synthesis and Characterization of Novel Fluoride and Oxide Cathodes for Rechargeable Batteries by : Nancy Hao-Jan Twu
Download or read book Synthesis and Characterization of Novel Fluoride and Oxide Cathodes for Rechargeable Batteries written by Nancy Hao-Jan Twu and published by . This book was released on 2015 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developing new cathode materials is key to improving the energy density of rechargeable batteries and enabling new applications of energy storage. In this thesis, two families of materials were explored as candidate cathode materials: the dirutile and rutile polymorphs of LiMnF4, and layered lithium-excess . . . Dirutile LiMnF4 was identified from high-throughput computation as a promising conversion cathode. The dirutile polymorph was synthesized through a new low temperature route, and the rutile polymorph was discovered upon mechanical milling. With simple synthesis and electrode preparation methods, both dirutile and rutile polymorphs of LiMnF4 showed electrochemical activity. Electron diffraction confirmed both polymorphs to convert upon lithiation along different reaction paths. As with other fluorides, specific capacity was strongly linked with processing conditions. The layered lithium-excess . . . compounds were designed from recent understanding of diffusion channels in lithium-excess materials. Increasing lithium content was found to improve both discharge capacity and capacity retention. Structural studies revealed a complex nanostructure pattern of Li-Sb and Ni-Sb ordering where the interface between these domains formed the correct local configuration for good lithium mobility. The
Book Synopsis Hydrothermal Synthesis and Structural Characterization of Intercalated Vanadium Oxides by : Megan L. Roppolo
Download or read book Hydrothermal Synthesis and Structural Characterization of Intercalated Vanadium Oxides written by Megan L. Roppolo and published by . This book was released on 2010 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Novel Cathodes and Electrolytes for Lithium-ion Batteries by : Chang Woo Lee
Download or read book Synthesis and Characterization of Novel Cathodes and Electrolytes for Lithium-ion Batteries written by Chang Woo Lee and published by . This book was released on 2003 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Novel Vanadium Oxide Compounds Using Surfactant Templates by : Arthur Dobley
Download or read book Synthesis and Characterization of Novel Vanadium Oxide Compounds Using Surfactant Templates written by Arthur Dobley and published by . This book was released on 2001 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low Temperature Synthesis and Characterization of Organically Templated Novel Vanadium Oxides by : Samuel T. Lutta
Download or read book Low Temperature Synthesis and Characterization of Organically Templated Novel Vanadium Oxides written by Samuel T. Lutta and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1998 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Novel Micro- and Nanostructured Vanadium, Molybdenum, and Iron Oxides by : Markus Niederberger (Chemiker)
Download or read book Synthesis and Characterization of Novel Micro- and Nanostructured Vanadium, Molybdenum, and Iron Oxides written by Markus Niederberger (Chemiker) and published by . This book was released on 2000 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrothermal Synthesis and Compositional Engineering of Lithium Iron Orthosilicate as Li-Ion Battery Cathode by : Yan Zeng
Download or read book Hydrothermal Synthesis and Compositional Engineering of Lithium Iron Orthosilicate as Li-Ion Battery Cathode written by Yan Zeng and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "In this thesis, lithium iron orthosilicate, Li2FeSiO4 (LFS), is synthesized, characterized, and evaluated electrochemically to investigate its capability as a cathode material for Li-ion batteries. Hydrothermal synthesis is employed to produce LFS particles with tailored properties aiming to meet the specifications of Li-ion cathodes. Compositional engineering via doping and non-stoichiometry is exploited on the pursuit of preferable electrochemical performance. Crystallization mechanism behind hydrothermal formation of LFS is revealed from time-resolved information on structure, composition and morphology via extensive ex situ characterizations. X-ray diffraction refinement combined with compositional analyses indicate a gradual transformation from amorphous hydrolysis products of Fe and Si to LFS crystallized in orthorhombic crystal system with space group Pmn21. Particle size can be varied effectively in the nanometer- to micrometer-range by changing the precursor concentrations, which is attributed to the role of Li activity in adjusting supersaturation and thus kinetics of nucleation and crystal growth. The addition of a complexing agent EDTA is utilized to regulate the activity of Fe, which consequently helps to avoid forming iron oxides and reduce Li-Fe antisite defects in LFS matrix. EDTA is also found to promote the formation of unique hollow mesocrystals that show promise in enhancing Li storage capacity. Electron microscopical characterizations suggest that after initial crystallization, LFS nanoparticles undergo self-assembly via nearly-oriented attachment and evolve to hollow mesocrystals following the Ostwald ripening rule.The viability of partial substituting into Fe several divalent cations in Pmn21 LFS is investigated using both first-principles calculations and hydrothermal synthesis. The formation of Co2+-doped Li2Fe0.94Co0.06SiO4 (CoLFS) is predicted to be energetically favorable, confirmed by successful hydrothermal synthesis. Electrochemical and spectroscopic characterizations on pristine and cycled electrodes are applied to investigate the effect of Co doping on electrochemical properties of LFS. Substitution of Co in LFS is found to enable faster phase transformation to the electrochemically induced phase (inverse Pmn21) and forms a less resistant and more uniform fluorine-rich cathode-electrolyte interphase (CEI) layer that protects the bulk particle from detrimental reactions with the electrolyte. As a result, Co2+-doped LFS displays enhanced reversibility with 95% capacity retention after 50 cycles as compared to the undoped LFS with only 80% retention. In the meantime, Mg2+, although can be incorporated into LFS lattice, results in even worse capacity retention. Ni2+ or Sr2+-substituted Pmn21 LFS could not be synthesized due to their high formation energies compared to their competing solid phases. The effect of non-stoichiometry on crystal structure, electronic structure and Li transport kinetics of LFS is investigated through a combined experimental and computational study. Non-stoichiometric Pmn21 LFS with up to 8% Fe excess are successfully synthesized by controlled hydrothermal synthesis. In addition to the higher electron capacity from the accessible Fe2+/Fe3+ redox couple, the presence of excess Fe enhances the intercalation kinetics compared to the stoichiometric composition. The enhanced kinetics are rationalized by the introduction of the Fe_Li^• + V_Li^' defect pair and new electron conducting states from the creation of local Fe–O–Fe configurations. Moreover, the Fe-rich structure facilitates Fe migration to Li-site due to lower energy barrier than stoichiometric LFS, hence leading to faster phase transformation from Pmn21 towards the cycled inverse Pmn21. Galvanostatic charge-discharge measurements show that Fe-rich LFS delivers higher capacity than the stoichiometric LFS from low to high current rates, for example 161.8 mAh g-1 versus 128.9 mAh g-1 at 0.02 C"--
Book Synopsis Synthesis and Characterization of Vanadium Oxide Based Nanostructured Materials and Their Application for Catalytic Oxidative Dehydration of Propane by : Sangita Deb
Download or read book Synthesis and Characterization of Vanadium Oxide Based Nanostructured Materials and Their Application for Catalytic Oxidative Dehydration of Propane written by Sangita Deb and published by . This book was released on 2008 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
