Papers by Keyword: MnO

Abstract: Transition metal oxaides especially manganese monoxide (MnO) are being intensively studied as candidate anode materials for next generation lithium ion batteries in high efficiency energy storage applications. In this paper, MnO/CNTs composite is prepared by hydrothermal reaction and subsequent annealing process. The results of XRD and SEM showed that MnO/CNTs composite is rod-like with good crystallinity, and its diameter is about 300 nm. It could deliver a reversible charge capacity of 689.6 mA h g^-1 at the current density of 14.4 mA g^-1, and the specific discharge capacity is 500.5 mA h g^-1 after 185 cycles. All the above makes MnO a promising anode material for lithium ion batteries with high capacity, long life time, low cost and environmental benignity.

Abstract: MnO powder was synthesized by a facile pyrolysis method using Mn(Ac)2•4H2O powder as the starting material at 800°C for 3h under nitrogen atmosphere. The morphology and structure character of MnO powder was studied by Field-emission scanning electron microscopy (SEM) and X-ray Diffraction. The electrochemical performance of the product was evaluated by galvanostatic charge/discharge experiment. The results shows that MnO powder can deliver a capacity of 604mAh/g at current density of 0.1C, and a capacity retention of 88% is acquired after 150 cycles at 1C rate.

Abstract: This calculation focus on the effect of Coulomb interaction U and exchange interaction J on spin magnetic moment M_s of MnO by using the local spin density approximation plus the Coulomb interaction (LSDA+U) method within full potential linear muffin-tin orbital (FP-LMTO). Our calculated results indicated that the spin magnetic moments correlated to U and J. The relevant results exhibited the increasing spin magnetic moments with increasing Coulomb interaction and exchange interaction. Furthermore, equation of spin magnetic moments, which good correspondence to the experimental data, were obtained and the relation of U and J parameter was defined.

Abstract: The MnO-SiO2-TiO2-Ti2O3 system is a key oxide system for well known “Oxide Metallurgy” for HSLA steel. However, the available thermodynamic data for this system are rare and even the available experimental data are often inconsistent with each other. In the present study, experimental and thermodynamic modeling studies have been carried out on the MnO-SiO2-TiO2-Ti2O3 system. High-temperature equilibration and quenching technique followed by EPMA (electron probe X-ray microanalysis) was used to determine liquidus temperatures and solid solubilities of the crystalline phases such as manganosite, rutile, spinel, pyrophanite, pseudobrookite, tridymite, etc. in the temperature range from 1200°C to 1550°C (1473 to 1823 K) under an atmosphere controlled by CO-CO2 gas mixture. These equilibrium data for the MnO-SiO2-TiO2-Ti2O3 system, combined with previously reported data for this system, were used to obtain an self-consistent set of optimized parameters of thermodynamic models for all phases. In addition, the application of the optimized thermodynamic database to oxide metallurgy was discussed.