Browsing Obrovac, Mark N. by Title

Now showing items 31-45 of 45

  • Phenolic Resin as an Inexpensive High Performance Binder for Li-Ion Battery Alloy Negative Electrodes 

    T.D. Hatchard, P. Bissonnette and M.N. Obrovac, Phenolic Resin as an Inexpensive High Performance Binder for Li-Ion Battery Alloy Negative Electrodes, J. Electrochem. Soc., 163 (2016) A2035-A2039.
    Phenolic resin was evaluated as a binder material for Li-ion battery negative electrodes containing Si-based alloys. Phenolic resin was found to have a large first lithiation capacity of about 1200 mAh/g, which is suspected ...

  • Polyaniline Electrode Activation in Li Cells 

    Michael Charlton, T. D. Hatchard, and M. N. Obrovac. Polyaniline Electrode Activation in Li Cells. J. Electrochem. Soc. (2020), 167 (8), 080501.
    Polyaniline (PANi) can be used as an electroactive organic cathode material in Li-cells with multiple redox states. The theoretical specific capacity of the emeraldine base (PEB) is 150 mAh g−1. In this study, we show how ...

  • Preparation of Low Surface Area Si-Alloy Anodes for Li-Ion Cells by Ball Milling 

    Simeng Cao, Mohammad H. Tahmasebi, Shayne Gracious, J. Craig Bennett, and M. N. Obrovac. Preparation of Low Surface Area Si-Alloy Anodes for Li-Ion Cells by Ball Milling. J. Electrochem. Soc. (2022), 169 (6), 060540.
    A new and simple 2-step milling technique is utilized to produce Si–Ti–N alloys with significantly reduced surface area compared to conventional ball milling, while still attaining a full amorphous active Si phase. Surface ...

  • Quantitative Determination of Carbon Dioxide Content in Organic Electrolytes by Infrared Spectroscopy 

    Haonan Yu and M. N. Obrovac, Quantitative Determination of Carbon Dioxide Content in Organic Electrolytes by Infrared Spectroscopy, J. Electrochem. Soc., 166 (2019) A2467 - A2470
    CO2 has been shown to be an effective additive to improve the cycling characteristics of silicon negative electrodes for Li-ion batteries. However, a quantitative technique for measuring the CO2 content in electrolyte is ...

  • Quantitative Measurement of Compositional Inhomogeneity in NMC Cathodes by X-ray Diffraction Postprint 

    Published Version: Mohammad H. Tahmasebi and M.N.Obrovac. Quantitative Measurement of Compositional Inhomogeneity in NMC Cathodes by X-ray Diffraction. J.Electrochem. Soc. (2023). Accepted manuscript. https://doi.org/10.1149/1945-7111/acefff
    A novel X-ray diffraction (XRD) analysis technique is described for quantitatively measuring compositional inhomogeneity in Li[NixMnyCoz]O2 (NMC) cathode materials and NMC precursors. Single-phase rock salt precursors with ...

  • Rapid mechanochemical synthesis of amorphous alloys 

    T.D. Hatchard, A. Genkin and M.N. Obrovac, Rapid Mechanochemical Synthesis of Amorphous Alloys, AIP Advances, 7 (2017) 045201.
    A rapid method for preparing amorphous alloys has been developed utilizing a SPEX high energy ball mill. Parameters such as ball size, mass of balls and milling time, were systematically optimized to prepare amorphous ...

  • 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 ...

  • 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 ...

  • Si85Fe15Ox Alloy Anode Materials with High Thermal Stability for Lithium Ion Batteries 

    Yijia Liu, Michael Charlton, Jun Wang, J. Craig Bennett and M. N. Obrovac. Si85 Fe15 Ox Alloy Anode Materials with High Thermal Stability for Lithium Ion Batteries. J. Electrochem. Soc. (2021), 168 (11), 110521.
    The synthesis, microstructure and electrochemical properties of ball milled Si85Fe15Ox alloys with different oxygen contents are investigated. These materials combine the features of Si-M alloys (low irreversible capacity) ...

  • Sintered polymeric binders for Li-ion battery alloy anodes 

    T.D. Hatchard, R.A. Fielden and M.N. Obrovac, Sintered Polymeric Binders for Li-ion Battery Alloy Anodes, Can. J. Chem., 96 (2018) 765-770.
    The cycling performance in lithium half cells of Si alloy electrodes with polyvinylidene fluoride or polyimide binders were evaluated after the electrodes were cured at temperatures below and above the binder carbonization ...

  • Spherically Smooth Cathode Particles by Mechanofusion Processing 

    Lituo Zheng, Congxiao Wei, M. D. L. Garayt, Judy MacInnis, and M. N. Obrovac, Spherically Smooth Cathode Particles by Mechanofusion Processing, J. Electrochem. Soc., 166 (2019) A2924-A2927.
    Surface modification has been shown to be useful for improving the cycling performance of cathode materials. Typically hetero-compositional coatings are applied on cathode particle surfaces using methods, such as aqueous ...

  • Stabilizing NaCrO2 by Sodium Site Doping with Calcium 

    Lituo Zheng, J. C. Bennett, and M. N. Obrovac, Stabilizing NaCrO2 by Sodium Site Doping with Calcium, J. Electrochem. Soc., 166 (2019) A2058 - A2064.
    Layered cathode materials based on abundant, low cost raw materials have garnered interest in recent years. O3-type NaCrO2 is a promising cathode material as it offers decent energy density and is easy to synthesize. In ...

  • Structural and Electrochemical Investigation of FexSi1-x Thin Films in Li Cells 

    Zhijia Du, R. A. Dunlap and M. N. Obrovac, Structural and Electrochemical Investigation of FexSi1-x Thin Films in Li Cells, J. Electrochem. Soc., 163 (2016) A2011-A2016.
    FexSi1-x thin films with 0 ≤ x ≤ 0.46 have been prepared by combinatorial sputtering and their electrochemical properties have been studied in Li half-cells. X-ray diffraction showed that all of the films had an amorphous ...

  • Synthesis, Lithium Insertion and Thermal Stability of Si–Mo Alloys 

    Simeng Cao, Shayne Gracious, J. Craig Bennett and M. N. Obrovac. Synthesis, Lithium Insertion and Thermal Stability of Si–Mo Alloys. J. Electrochem. Soc. (2020), 167 (13), 130531.
    Li insertion was investigated in SixMo100−x (90 ≥ x ≥ 70, Δx = 10) alloys prepared by mechanical ball milling. X-ray diffraction (XRD) and quantitative phase analysis were used to analyze phase compositions of these Si–Mo ...

  • 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.