Abstract.We report on the synthesis and structural, thermal and electrochemical characterisation of reduced molybdenum oxides with layered ~-MoO 3 type structure. The samples have been prepared by reactions of various amounts of water-free tin dichloride with fine-particulated orthorhombic molybdenum trioxide in n-hexane (non-aqueous media) or in aqueous media, which yielded materials with different Sn:Mo ratio. XRD investigations of these materials proved that the crystal structure of the layered o~-MoO 3 has been maintained after the reduction process. No crystalline impurity phases (e.g. tin oxides) could be detected by XRD.The tin-reduced samples exhibited a drastically improved cycling stability and capacity retention on cycling in 1 M LiC104 / propylene carbonate, i.e. the discharge capacities were well above 100 mAh g-~ after 20 cycles whereas the non-treated MoO 3 (reference sample) has retained only about 45 mAh g-~. At higher cycle numbers (approx. cycle 100) the discharge capacity of the reduced molybdenum oxides stabilises at a level of approx. 100 mAh g-1. This significant improvement of the rechargeability may be related to improved electronic conductivity and/or higher structural stabilisation of the layered MoO~ structure either due to (i) a coating of the MoO 3 particles with a protective thin layer of a tin containing compounds, and/or (ii) an amorphisation of the structure after reductive treatment. Further efforts of this study were devoted to a variation of the conductive carbon content in the electrode composition and to changes of cut-~ff voltages and current densities.

Metal storage tanks for liquid gas are unstable at low temperature (below zero degreecentigrade), because the metal tends to be brittle and susceptible to crack. In this researchstudying some physical properties such as shrinkage, adhesion force and coating layer thicknessof aluminum powder with ethyl silicate as a binder were performed. The results shown, that thecoating with such layer has excellent resistance to low temperature and impermeable to liquidgas for example, propane, methane and nitrogen a suitable coating layer thickness is (5mm). Thedata and results were optimized by using Taguchi / ANOVA Technique