A5005769938- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Extraction and Separation Processes
- Supercapacitor Materials and Fabrication
- Semiconductor materials and devices
- Transition Metal Oxide Nanomaterials
- Semiconductor materials and interfaces
- Metallurgical Processes and Thermodynamics
- Electron and X-Ray Spectroscopy Techniques
- Magnetic Properties and Synthesis of Ferrites
- Gas Sensing Nanomaterials and Sensors
- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Inorganic Chemistry and Materials
- Magnetic and transport properties of perovskites and related materials
- Graphene research and applications
- Advanced Condensed Matter Physics
- Fuel Cells and Related Materials
- Analytical Chemistry and Sensors
- Microwave Dielectric Ceramics Synthesis
- Electrodeposition and Electroless Coatings
- Chemical Thermodynamics and Molecular Structure
- Interconnection Networks and Systems
- Crystallization and Solubility Studies
Argonne National Laboratory
2015-2024
The University of Melbourne
2020
Austin Health
2020
Peninsula Health
2020
Eastern Health
2016-2020
Monash Health
2016-2020
Monash University
2016-2020
University of Glasgow
2016-2020
Australian Catholic University
2020
St Vincent's Health
2020
The escalating and unpredictable cost of oil, the concentration major oil resources in hands a few politically sensitive nations, long-term impact CO2 emissions on global climate constitute challenge for 21st century. They also incentive to harness alternative sources energy means vehicle propulsion. Today's lithium-ion batteries, although suitable small-scale devices, do not yet have sufficient or life use vehicles that would match performance internal combustion vehicles. Energy densities...
A strategy used to design high capacity (>200 mAh g−1), Li2MnO3-stabilized LiMO2 (M = Mn, Ni, Co) electrodes for lithium-ion batteries is discussed. The advantages of the Li2MnO3 component and its influence on structural stability electrochemical properties these layered xLi2MnO3·(1 − x)LiMO2 are highlighted. Structural, chemical, thermal considered in context other commercially exploited electrode systems, such as LiCoO2, LiNi0.8Co0.15Al0.05O2, Li1+xMn2−xO4 LiFePO4.
The cathode in rechargeable lithium-ion batteries operates by conventional intercalation; Li+ is extracted from LiCoO2 on charging accompanied oxidation of Co3+ to Co4+; the process reversed discharge. In contrast, may be Mn4+-based solids, e.g., Li2MnO3, without Mn4+. A mechanism involving simultaneous Li and O removal often proposed. Here, we demonstrate directly, situ differential electrochemical mass spectrometry (DEMS), that O2 evolved such Mn4+ -containing compounds,...
Recent advances to develop manganese-rich electrodes derived from ‘composite’ structures in which a Li2MnO3 (layered) component is structurally integrated with either layered LiMO2 or spinel LiM2O4 component, M predominantly Mn and Ni, are reviewed. The electrodes, can be represented two-component notation as xLi2MnO3·(1 − x)LiMO2 x)LiM2O4, activated by lithia (Li2O) and/or lithium removal the Li2MnO3, components. provide an initial capacity >250 mAh g−1 when discharged between 5 2.0 V vs....
Lithium- and manganese-rich layered electrode materials, represented by the general formula xLi2MnO3·(1 − x)LiMO2 in which M is Mn, Ni, Co, are of interest for both high-power high-capacity lithium ion cells. In this paper, synthesis, structural electrochemical characterization x)LiMn0.333Ni0.333Co0.333O2 electrodes over a wide compositional range (0 ≤ x 0.7) explored. Changes that occur to compositional, structural, properties as function importance using relatively high manganese content...
Anodes of , and with a spinel‐type structure have been evaluated in room‐temperature lithium cells. The cathodes that were selected for this study the stabilized spinels, layered . electrochemical data demonstrated Li+ ions will shuttle between two transition‐metal host structures (anode cathode) at reasonably high voltage concomitant change oxidation state transition metal cations so do not reduce to metallic anode during charge. These cells safety hazards associated containing...
Electrochemical and structural properties of xLi2M'O3·(1−x)LiMn0.5Ni0.5O2 electrodes (M' = Ti, Mn, Zr; 0 ≤ x 0.3) for lithium batteries are reported. Powder X-ray diffraction, lattice imaging by transmission electron microscopy, nuclear magnetic resonance spectroscopy provide evidence that, M' Ti the Li2M'O3 component is structurally integrated into LiMn0.5Ni0.5O2 to yield "composite" structures with domains having short-range order, rather than true solid solutions in which cations...
Rechargeable lithium batteries that can be assembled in the discharged state with lithiated metal oxide cathodes and carbon anodes are being developed to minimize safety hazards associated use pure metallic anodes. This paper reviews crystallographic aspects of insertion electrodes layered spinel structures . The (spinel) instead as anode is briefly discussed. Emphasis placed on structural properties control their stability during electrochemical cycling.
Magnesium-substituted spinel electrodes have been investigated as insertion for lithium batteries. The substitution of divalent Mg ions monovalent Li in the structure necessitates that difference charge must be compensated by a reduction an equivalent number Ti cations from to increases conductivity framework many orders magnitude, insulating which all titanium are tetravalent, average oxidation state is 3.8. improved decreases area specific impedance cells and rate capability small x,...
Evidence of structural fatigue has been detected at the surface discharged spinel electrodes in (4 V) cells. Under nonequilibrium conditions, domains tetragonal coexist with cubic , even above thermodynamic voltage expected for onset phase. The presence on particle may contribute to some capacity fade observed during cycling ©1998 Electrochemical Society
A new approach to synthesizing high capacity lithium-metal-oxide cathodes for lithium-ion batteries from a Li2MnO3 precursor is described. The technique, which simple and versatile, can be used prepare variety of integrated 'composite' electrode structures, such as 'layered-layered' xLi2MnO3•(1–x)LiMO2, 'layered–spinel' xLi2MnO3•(1–x)LiM2O4, 'layered-rocksalt' xLi2MnO3• (1–x)MO more complex arrangements, in M typically Mn, Ni, and/or Co. Early indications are that electrodes prepared by this...
This paper reports the results of an initial investigation into phenomenon hysteresis in charge–discharge profile high-capacity, lithium- and manganese-rich "layered–layered" xLi2MnO3·(1–x)LiMO2 composite cathode structures (M = Mn, Ni, Co) "layered–layered-spinel" derivatives that are interest for Li-ion battery applications. In this study, electrochemical measurements, combined with situ ex X-ray characterization, used to examine compare structural processes occur during charge (lithium...
Structural and electrochemical data of xLi2MnO3•(1-x)LiMn0.5Ni0.5O2 electrodes, as a function Li2MnO3 content, x, are presented. Three distinct processes have been identified tracked during extended cycling. In addition to the standard intercalation behavior typical layered metal oxide two additional phenomena, manifest hysteresis continuous voltage fade, found be directly related one another. These consequence component in reaction. This finding, coupled X-ray absorption data, reveals that...
The structural and electrochemical features of layered 0.5Li2MnO3·0.5LiMO2 electrodes, in which M = Mn0.5−xNi0.5−xCo2x (0 ≤ x 0.5), have been studied by powder X-ray diffraction, differential-capacity measurements, 7Li magic-angle-spinning nuclear magnetic resonance, absorption near-edge spectroscopy. Li2MnO3-like regions the as-prepared samples were observed for all values x, with transition-metal cation disorder between LiMO2 Li2MnO3 components increasing cobalt content (i.e., value x)....