Lithium vanadate

Lithium vanadate bronzes are intercalated compounds with potential applications for lithium battery technology, since Li can be reversibly inserted into these stmctures by electrochemical reaction. Li NMR has been used to study the stmcture of 7-Lio.95V205 (Cocciantelli et al. 1992) and a series of related bronzes LixV205 (Cocciantelli et al. 1992a). The Li NMR spectrum of the -y-phase indicates the presence of a single Li site, but as the Li content is increased beyond x = 1, new lines can be resolved, corresponding... 

As far as the positive electrode material is concerned, promising alternatives appear to be the mixed lithium vanadates of general formula LiCoyNi(i.y)V04 [3,4]. These compounds adopt an inverse spinel structure, where Li ions reside in octahedral sites, Ni and Co ions... 

The composition dependence of the diffusion coefficient of lithium in the lithium vanadate Li V20s has a complicated character (Fig. 2.6). The extremes on the DC—X the entropy—x curves appear at the same values of x, which is not surprising since both parameters are connected to the material structure. Calculation of the DC from SSCAM experiment using = nF/RT did not reveal such correlation indirectly confirming the rationality of the developing approach. 

Lithium aluminum hydride reduced )J-azidoethylbenzene to j8-aminoethyl-benzene in 89% yield [600], The azido group was also reduced with aluminum amalgam (yields 71-86%) [149], with titanium trichloride (yields 54-83%) [601], with vanadous chloride (yields 70-95%) [217] Procedure 40, p. 215), with hydrogen sulfide (yield 90%) [247], with sodium hydrosulfite (yield 90%) [259], with hydrogen bromide in acetic acid (yields 84-97%) [232], and with 1,3-propanedithiol (yields 84-100%) [602]. Unsaturated azides were reduced to unsaturated amines with aluminum amalgam [149] and with 1,3-propane-dithiol [602]. 

Basic Lithium Metavanadate, 3Li20.2Va05.15H20 or Lia0.4LiV03. 15H20, is obtained by crystallising lithium ortho vanadate from dilute nitric acid.3... 

Iron vanadate, FeV04, is a prospective material for lithium rechargeable batteries and in catalysis. In [90] mechanical coactivation of iron and vanadium oxides was used to prepare intimate nanoscale mixture, similar to those prepared by soft chemistry. Reduction of this mixture at the same temperature and oxygen partial pressure conditions as of soft chemistry products (500°C and 10 Pa) leads to formation of a nanometric vanadium ferrite with the only spinel phase. The characterization of the powders thus prepared was perfomed by X-ray diffraction, SEM, IR spectrometry, thermogravimetry and colourimetry. It was shown that the homogeneity of grain size and chemical composition is achieved if the initial oxides have similar grain size. 

VANADIUM (7440-62-2) V The finely divided material reacts with air, water, acids, alcohols may release flammable hydrogen gas and chemically basic materials. A reducing agent. Violent reaction with strong oxidizers, bromine trifluoride, chlorine, lithium, nitryl fluoride nitric, hydrofluoric, or concentrated sulfuric acids. May react with halogenated hydrocarbons, forming other reactive and possibly explosive materials. It reacts with chlorine at 356°F/180°C, forming vanadium tetrachloride. Forms water-soluble vanadates in alkalis. 

VANADIUM PENTOXIDE or VANADIUM, PENTOXYDE de (French) (1314-62-1) VjOj Noncombustible, but may initiate fire or explosions or enhance the combustibility or oxidation rate of materials that are noncombustible in air. A strong oxidizer accelerates the burning of combustible materials. Reacts with strong acids, calcium, chlorine trifluoride, peroxyformic acid, combustible materials, organic substances, sulfur, water. Reacts with lithium at elevated temperatures. Contact with alkalis forms water soluble vanadates. Aqueous solution is acidic incompatible with sulfuric acid, alkalis, ammonia, aliphatic amines, alkanolamines, alkylene oxides, amides, chlorine trifluoride, epichlorohydrin, nitromethane, organic anhydrides, isocyanates, peroxyformic acid, vinyl acetate. On small fires, use dry chemical powder (such as Purple-K-Powder), foam, water spray, or COj extinguishers. 

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