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Now showing items 145 - 160 of 67002

  • Strain tuned Li diffusion in LiCoO2 material for Li ion batteries: A first principles study

    Ning, Fanghua   Li, Shuai   Xu, Bo   Ouyang, Chuying  

    To improve the rate performance of the LiCoO2 cathode, it is essential to enhance its Li ion diffusion coefficient From density functional theory calculations, we show that the Li ion migration energy barrier in LiCoO2 is sensitive to the strain applied to the lattice. The Li ion migration energy barrier decreases/increases substantially upon tensile/compressive stress applied along the c-axis direction, leading to the changes of the Li diffusion coefficient in several orders of magnitude at 300 K. Furthermore, strain applied in the ab-plane can also affect the Li diffusion in LiCoO2 as well, but the effect is not as obvious as strain applied along the c-axis direction. These results prompt a new way to tune the rate performance of LiCoO2. (C) 2014 Elsevier B.V. All rights reserved.
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    The disclosure provides methods for producing Li2S-graphene oxide (Li2S-GO) composite materials. The disclosure further provides for the Li2S-GO made therefrom, and the use of these materials in lithium-sulfur batteries.
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  • Investigation on the stability of Li metal anode in the Li–O2 batteries with a redox mediator

    Ha, Seongmin   Kim, Youngjin   Koo, Dongho   Ha, Kwang-Ho   Park, Yu won   Kim, Dong-min   Son, Samick   Yim, Taeeun   Lee, Kyu Tae  

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  • Li vaporization properties of candidate materials for tritium breeder with high Li density

    Shin-mura, Kiyoto   Otani, Yu   Ogawa, Seiya   Hoshino, Tsuyoshi   Sasaki, Kazuya  

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  • Li as Cultural Grammar: On the Relation between Li and Ren in Confucius\" Analects


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  • Photoelectron spectroscopic study of Li oxides on Li over-deposited V2O5 thin film surfaces

    Qi-Hui Wu   A. Thissen   W. Jaegermann  

    The Li oxides species formed on Li over-deposited V 2O 5 thin film surfaces have been studied by using X-ray and UV induced photoelectron spectroscopy (XPS and UPS). The photoelectron spectroscopic data show that the Li over-deposited V 2O 5 system itself is not stable. Further chemical decomposition reactions are taken place even under UHV conditions and lead to form Li 2O and Li 2O 2 compounds on the surface. The formation of Li 2O 2 causes to arise an emission line at about 11.3eV in the valence band spectra. [All rights reserved Elsevier]
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  • Utilization of Al2O3 Atomic Layer Deposition for Li Ion Pathways in Solid State Li Batteries

    Woo, J. H.   Travis, J. J.   George, S. M.   Lee, S.-H.  

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  • D, He and Li sputtering of liquid eutectic Sn–Li

    J.P. Allain   D.N. Ruzic   M.R. Hendricks  

    The absolute sputtering yields from bombardment of D +, He + and Li + on liquid tin-lithium eutectic have been measured and modeled at energies between 200 and 1000 eV. The ion-surface interaction experiment (IIAX) has been optimized to reliably measure the absolute sputtering yield of many ion-target combinations including solid and liquid lithium. A Colutron ion source is used to create and accelerate gaseous or metal ions onto a liquid metal target. The bombarding ions are mass-selected through an EtimesB filter and decelerated near the target. The target can be rotated in order to provide variation in the angle of incidence. Deuterium plasma from a hollow cathode source is used to remove any remaining oxides. Upon melting of the sample a thin oxide layer forms and is cleaved by an in situ arm. Results show that sputtering yields from liquid tin-lithium are larger than pure lithium. In addition, modeling with VFTRIM-3D confirms that Li atoms segregate to the surface of liquid tin-lithium. This is consistent with results of ion fraction of sputtered atoms, which show a sputtered-atom ion fraction of 65% for liquid tin-lithium, equal to pure liquid lithium, and <10% for solid tin-lithium
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  • Electrochemical behavior of Mg–Li, Mg–Li–Al and Mg–Li–Al–Ce in sodium chloride solution

    Dianxue Cao   Lin Wu   Yong Sun   Guiling Wang   Yanzhuo Lv  

    Mg-Li, Mg-Li-Al and Mg-Li-Al-Ce alloys were prepared and their electrochemical behavior in 0.7 M NaCl solutions was investigated by means of potentiodynamic polarization, potentiostatic current-time and electrochemical impedance spectroscopy measurements as well as by scanning electron microscopy examination. The effect of gallium oxide as an electrolyte additive on the potentiostatic discharge performance of these magnesium alloys was studied. The discharge activities and utilization efficiencies of these alloys increase in the order: Mg-LiMg-Li-Al>Mg-Li-Al-Ce. Mg-Li-Al-Ce exhibited the best performance in term of activity, utilization efficiency and activation time. [All rights reserved Elsevier].
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  • Doped carbon-sulfur species nanocomposite cathode for Li—S batteries

    We report a heteroatom-doped carbon framework that acts both as conductive network and polysulfide immobilizer for lithium-sulfur cathodes. The doped carbon forms chemical bonding with elemental sulfur and/or sulfur compound. This can significantly inhibit the diffusion of lithium polysulfides in the electrolyte, leading to high capacity retention and high coulombic efficiency.
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    The invention relates to a coating agent system, comprising the components (A) to (C) and optionally further components, wherein, in a first option, all components (A) to (C) and optionally also the further optional components are separate from each other, that is to say the individual components are not mixed with each other. In a second option of the coating agent system according to the invention, the components mentioned above can be, on the other hand, completely or at least partially mixed with each other. If the components are at least partially mixed with each other, this signifies that, for example, component (C) is mixed with component (A) while component (B) is present in a separate manner with respect to the mixture of components (A) and (C). Optionally, component (B) can also be mixed with a partial quantity of component (C). In addition, the mixtures of (A) and (C) and of (B) and (C) can contain at least one optional component such as, for example, a solvent. Component (A) is at least a polyhydroxyl group-containing compound and component (B) is at least a polyisocyanate-containing compound. Component (C), however, is a catalyst which contains lithium and bismuth as metal components in a molar ratio of at least 7:1. Further components that can be contained in the coating agent system according to the invention, include, for example, hydroxyl group-containing compounds (B), paint additives (F), pigments (H) and/or solvents (J).
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  • Chlorine-containing resin with LI hydroxide (monohydrate) or LI carbonate

    A chlorine-containing resin composition and molded products thereof comprising a chlorine-containing resin and at least one of lithium compounds selected from the group consisting of lithium hydroxide, lithium hydroxide monohydrate and lithium carbonate, wherein the at least one of lithium compounds is uniformly dispersed within the chlorine-containing resin.
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    A method and system for charging a rechargeable battery, such as a Lithium based battery, by applying a voltage charge signal, and monitoring a battery charging current and a varying internal resistance of the battery and the changes in open circuit voltage of the battery. The voltage charge signal is dynamically established as a function of the measured varying internal resistance of the battery during charging and the changes in open circuit voltage of the battery. The voltage charge signal is a function of a state of charge (SOC) of the battery.
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  • The factors affecting the electrochemical performance of Li/LixMnO2 solid-state polymer battery

    Wang, Congxiao   Xia, Yongyao   Fujieda, Takuya   Sakai, Tetsuo   Muranaga, Toshio  

    The electrochemical behavior of an all solid-state Li/LixMnO2 polymer cell was evaluated by using three kinds of polymer-electrolytes in the composite positive electrodes. The discharge-rate capability and cycle life was significantly improved by using low-molecular weight polymer-electrolyte. It was confirmed that the improvement is due to the smaller charge transfer resistance between a polymer-electrolyte/cathode material interface, and the compatibility of polymer-electrolyte toward the cathode material is much more direct than the ionic conductivity of the polymer-electrolyte in the effects on its rate capability and cyclability.
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  • Method and apparatus for fast charging Li based rechargable batteries

    A method and system for charging a rechargeable battery, such as a Lithium based battery, by applying a voltage charge signal, and monitoring a battery charging current and a varying internal resistance of the rechargeable battery and changes in open circuit voltage of the rechargeable battery. The voltage charge signal is dynamically established as a function of the varying internal resistance of the rechargeable battery during charging and the changes in open circuit voltage of the rechargeable battery. The voltage charge signal is a function of a state of charge (SOC) of the rechargeable battery.
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  • Dispersion coefficients for Li+–H and Li+–He systems with coulomb and screened coulomb potentials

    Sabyasachi Kar   Y. K. Ho  

    Exploiting powerful computational aspects and highly correlated exponential wave functions for two-electron atoms, we have investigated the effects of screened Coulomb interaction on the hexadecapole polarizability of Li +(1 1S), and the dispersion coefficients C6, C8, C10, and C12 for interaction of Li + with H and He atoms in their ground states. The dispersion coefficients and hexadecapole polarizability for different screening parameters ranging from 0 to 1.0 a0-1 are reported. In the unscreened case, the hexadecapole polarizability of Li +, and the dispersion C12 coefficients for Li +-H and Li +-He system are reported for the first time in the literature. The C6, C8, and C10 coefficients for the unscreened cases are comparable with the reported results. copy 2011 Wiley Periodicals, Inc.
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