Browsing Obrovac, Mark N. by Issue Date

Now showing items 1-20 of 45

  • Use of carbon black to eliminate surface charging effects in photoelectron spectroscopy measurements of powders 

    Obrovac, MN, Y. Gao, MN Richard, and JR Dahn. 1997. "Use of carbon black to eliminate surface charging effects in photoelectron spectroscopy measurements of powders." Applied Physics Letters 71(16): 2262-2264.
    No abstract available.

  • Explanation for the 4.8-V plateau LiCrxMn2-xO4 

    Obrovac, MN, Y. Gao, and JR Dahn. 1998. "Explanation for the 4.8-V plateau LiCrxMn2-xO4." Physical Review B 57(10): 5728-5733.
    Using the results of photoelectron spectroscopy (PES) measurements on LiCrxMn2-xO4 we provide an explanation for the origin of the 4.8-V plateau in Li/LiCrxMn2-xO4 cells. PES shows that the d bands derived from Mn 3d e(g) ...

  • Implications of finite-size and surface effects on nanosize intercalation materials 

    Obrovac, MN, and JR Dahn. 2000. "Implications of finite-size and surface effects on nanosize intercalation materials." Physical Review B 61(10): 6713-6719.
    A Monte Carlo simulation of a two-dimensional lattice gas with free boundaries is used to study the effects of surface and size on the chemical potential-composition curves of intercalation compounds. In particular we are ...

  • A Combinatorial Investigation of Fe-Si-Zn Thin Film Negative Electrodes for Li-ion 2 Batteries (Preprint) 

    Published Version: L. Brown, S. Smith and M. N. Obrovac, Mixed Transition Metal Titanate and Vanadate Negative Electrode Materials for Na-Ion Batteries, J. Electrochem. Soc., 162 (2015), A15-A20.
    Sodium-ion batteries have the potential to be a low cost, sustainable replacement for lithium-ion batteries in large scale energy storage. The lack of practical negative electrode materials limit the development of Na-ion ...

  • Mixed Transition Metal Titanate and Vanadate Negative Electrode Materials for Na-Ion Batteries (Preprint) 

    Published Version: L. Brown, S. Smith and M. N. Obrovac, Mixed Transition Metal Titanate and Vanadate Negative Electrode Materials for Na-Ion Batteries, J. Electrochem. Soc., 162 (2015), A15-A20. https://doi.org/10.1149/2.0171501jes
    Sodium-ion batteries have the potential to be a low cost, sustainable replacement for lithium-ion batteries in large scale energy storage. The lack of practical negative electrode materials limit the development of Na-ion ...

  • A Combinatorial Investigation of Fe-Si-Zn Thin Film Negative Electrodes for Li-ion 1 Batteries (Preprint) 

    Published Version: L. MacEachern, R.A. Dunlap and M.N Obrovac, A Combinatorial Investigation of Fe-Si-Zn Thin Film Negative Electrodes for Li-Ion Batteries, J. Electrochem. Soc., 162 (2015), A229-A234. https://doi.org/10.1149/2.1051501jes
    Thin-film Fe-Si-Zn libraries were investigated as negative electrode materials for Li-ion batteries using combinatorial and high-throughput techniques. X-ray diffraction and electron microprobe measurements were used to ...

  • Li-ion Battery Negative Electrodes Based on the FexZn1-x Alloy System (Preprint) 

    Published Version: L. MacEachern, R.A. Dunlap and M.N. Obrovac, Li-ion Battery Negative Electrodes Based on the FexZn1−x Alloy System, J. Non-Cryst. Solids, 409 (2015), 183-190. https://doi.org/10.1016/j.jnoncrysol.2014.11.026
    Thin-film Fe-Zn libraries were investigated as negative electrode materials for Li-ion batteries using combinatorial and high-throughput techniques. X-ray diffraction, Mössbauer effect spectroscopy and electron microprobe ...

  • Investigation of the NaNixMn1-xO2 (0 ≤ x ≤ 1) System for Na-ion Battery Cathode Materials (Preprint) 

    Published Version: R. Fielden and M. N. Obrovac, Investigation of the NaNixMn1-xO2 (0 ≤ x ≤ 1) System for Na-Ion Battery Cathode Materials, J. Electrochem. Soc., 162 (2015), A453-A459. https://doi.org/10.1149/2.0551503jes
    Layered NaNixMn1-xO2 (0 ≤ x ≤ 1) oxides were prepared via solid state reactions. Different reaction conditions were required to obtain phase pure samples, depending on the value of x. The 0 ≤ x ≤ 0.1 compositions were ...

  • The Reversible Magnesiation of Pb (Preprint) 

    Published Version: Kalani Periyapperuma, Tuan T. Tran, M.I. Purcell and M.N. Obrovac, The Reversible Magnesiation of Pb, Electrochim. Acta, 165 (2015) 162-165. https://doi.org/10.1016/j.electacta.2015.03.006
    Sputtered Pb films have been found to reversibly alloy electrochemically with magnesium in Grignard based electrolytes. The voltage curve shows a single plateau at about 125 mV vs. Mg, corresponding to the formation of ...

  • Combinatorial Investigations of Ni-Si Negative Electrode Materials for Li-Ion Batteries 

    Zhijia Du, T.D. Hatchard, R.A. Dunlap and M.N. Obrovac, Combinatorial Investigations of Ni-Si Negative Electrode Materials for Li-Ion Batteries, J. Electrochem. Soc., 162 (2015), A1858-A1863.
    Sputtered thin films in the Ni-Si system (0 ≤ x ≤ 0.65 in NixSi1-x) were studied for use as anode materials in Li-ion cells. All compositions were found to be amorphous. The Ni in Ni-Si films was found to suppress the ...

  • Mössbauer and Electrochemical Investigations of Carbon-Rich Fe1-xCx Films (Preprint) 

    Published Version: Xiuyun Zhao, R.J. Sanderson, L. MacEachern, R.A. Dunlap and M.N. Obrovac, Mössbauer and Electrochemical Investigations of Carbon-Rich Fe1-xCxFilms, Electrochim. Acta, 170 (2015), 16-24. https://doi.org/10.1016/j.electacta.2015.04.116
    A thin film binary library of carbon-rich Fe1-xCx (0.47 ≤ x ≤ 0.97) alloys was prepared by combinatorial sputtering of carbon and iron. The sputtered library was characterized by X-ray diffraction and room temperature 57Fe ...

  • Reversible lithium insertion in catalytically graphitized sugar carbon 

    M.N. Obrovac, Xiuyun Zhao, L.T. Burke and R.A. Dunlap, Reversible Lithium Insertion in Catalytically Graphitized Sugar Carbon, Electrochem. Commun., 60 (2015), 221-224
    Highlights • First report of Li insertion in highly ordered catalytically derived graphite. • Fe catalyst combined with hard carbon precursors enable 1200 °C graphitization. • First report of highly ordered graphite ...

  • NixSi1-x Alloys Prepared by Mechanical Milling as Negative Electrode Materials for Lithium Ion Batteries 

    NixSi1-x (0 ≤ x ≤ 0.5, x = 0.05) alloys were prepared by ball milling and studied as anode materials for lithium ion batteries. Nanocrystalline Si/NiSi2 phases were formed for x ≤ 0.25. The NiSi phase was observed for ...

  • The Electrochemistry of Amorphous Si-B Thin Film Electrodes in Li Cells 

    Hui Liu, Min Zhu, Zhijia Du and M.N. Obrovac, The Electrochemistry of Amorphous Si-B Thin Film Electrodes in Li Cells, J. Electrochem. Soc., 163 (2016), A192-A196
    Abstract Si1-xBx thin films of 0.071 ≤ x ≤ 0.950 have been synthesized using combinational sputtering. All Si1-xBx film compositions had a highly amorphous structure consisting of amorphous Si and B phases, as characterized ...

  • Combinatorial Study of the Si-Sn-O System as Negative Electrode Materials in Li-Ion Cells 

    Xiuyun Zhao, M.T. Schreiber, L. MacEachern, R.J. Sanderson, R.A. Sanderson, R.A. Dunlap and M.N. Obrovac, Combinatorial Study of the Si-Sn-O System as Negative Electrode Materials in Li-Ion Cells, J. Electrochem. Soc., 163 (2016), A203-A209.
    SixSnyO1-x-y films with 0.45 < x < 0.80, 0.05 < y < 0.35, and 0.05 < (1-x-y) < 0.40 have been prepared using a magnetron sputtering method. All compositions had an amorphous structure and good capacity retention. Reversible ...

  • Li15Si4 Formation in Silicon Thin Film Negative Electrodes 

    D.S. Iaboni and M.N. Obrovac, Li15Si4 Formation in Silicon Thin Film Negative Electrodes, J. Electrochem. Soc., 163 (2016), A255-A261.
    The conditions for Li15Si4 formation in Si thin film negative electrodes was studied during charge and discharge cycling in lithium cells. It was found that Li15Si4 formation can be suppressed during cycling of Si thin ...

  • The Electrochemical Behavior of Polyimide Binders in Li and Na Cells 

    B. N. Wilkes, Z. L. Brown, L. J. Krause, M. Triemert and M. N. Obrovac, The Electrochemical Behavior of Polyimide Binders in Li and Na Cells, J. Electrochem. Soc., 163 (2016), A364-A372.
    The electrochemistry of aromatic and aliphatic polyimide binders was characterized in composite coatings for Li-ion and Na-ion battery negative electrodes. Aromatic polyimide was found to have a large first lithiation ...

  • Electrochemistry of Catalytically Graphitized Ball Milled Carbon in Li Batteries 

    High carbon Fe-C composites with starting concentrations of 10, 20, 30, and 40 wt% Fe (2.3 - 12.5 atomic % Fe) were prepared by ball milling followed by annealing. Increasing the Fe concentration and annealing temperature ...

  • The Electrochemical Reaction Mechanism of Tin Phosphide with Sodium 

    Lituo Zheng, R.A. Dunlap and M.N. Obrovac, The Electrochemical Reaction Mechanism of Tin Phosphide with Sodium, J. Electrochem. Soc., 163 (2016), A1188-1191.
    The sodiation mechanism of Sn4P3 was studied by ex-situ X-ray diffraction and Mössbauer effect spectroscopy. These results show that Sn4P3 is initially amorphized during sodiation, and suggest that upon further sodiation ...

  • Electrochemistry of CuxSi1−x Alloys in Li Cells 

    Zhijia Du, Hui Liu, S.N. Ellis, R.A. Dunlap, M. Zhu and M.N. Obrovac, Electrochemistry of CuxSi1−x Alloys in Li Cells, J. Electrochem. Soc., 163 (2016), A1275-1279.
    The structure and electrochemistry in lithium cells of sputtered thin films and ball milled alloys in the Cu-Si system (0 ≤ x ≤ 0.60 in CuxSi1−x) were investigated. Both thin films and ball milled Cu-Si alloys showed the ...