A5034069838- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Ionic liquids properties and applications
- Magnetic Properties and Applications
- Microstructure and Mechanical Properties of Steels
- Microstructure and mechanical properties
- Advanced battery technologies research
- Electrochemical Analysis and Applications
- Low-power high-performance VLSI design
- High voltage insulation and dielectric phenomena
- Hydrogen embrittlement and corrosion behaviors in metals
- Anodic Oxide Films and Nanostructures
- Extraction and Separation Processes
- Fuel Cells and Related Materials
- VLSI and FPGA Design Techniques
- Supercapacitor Materials and Fabrication
- Electric and Hybrid Vehicle Technologies
- Solidification and crystal growth phenomena
- Hybrid Renewable Energy Systems
University of Michigan
2015-2020
Washington State University
2014-2016
This paper presents the computational assessment of electrochemical stability a series alkyl methylimidazolium-based ionic liquids for their use as lithium battery electrolytes. The oxidation and reduction potentials constituent cation anion each liquid with respect to Li+/Li reference electrode were calculated using density functional theory following method thermodynamic cycles, windows (ESW)s these obtained. effect varying length side chains cations on redox ESWs was investigated. results...
Rechargeable batteries employing metal negative electrodes (i.e., anodes) are attractive next-generation energy storage devices because of their greater theoretical densities compared to intercalation-based anodes. An important consideration for a metal's viability as an anode is the efficiency with which it undergoes electrodeposition and electrodissolution. The present study assesses thermodynamic deposition/dissolution efficiencies associated nucleation rates seven metals (Li, Na, K, Mg,...
In composite battery electrode architectures, local limitations in ionic and electronic transport can result nonuniform energy storage reactions. Understanding such reaction heterogeneity is important to optimizing performance, including rate capability mitigating degradation failure. Here, we use spatially resolved X-ray diffraction computed tomography map the a based on LiFePO4 active material as it undergoes charge discharge. Accelerated reactions at faces contact with either separator or...
Electron transfer reaction at the cathode–electrolyte interface in a lithium–air battery, whereby oxygen molecule is reduced, modeled and rates are correlated with structure of cation.
Room temperature ionic liquids, which have unique properties such as a relatively wide electrochemical stability window and negligible vapor pressure, are promising candidates electrolytes for developing lithium–air batteries with enhanced performance. The local current density, crucial parameter in determining the performance of batteries, is directly proportional to rate constant electron transfer reaction at surface anode that involves oxidation pure lithium metal into ion (Li+). liquid...
Lithium-air batteries are very promising energy storage systems for meeting current demands in electric vehicles. However, the performance of these is highly dependent on electrochemical stability and physicochemical properties electrolyte such as ionic conductivity, vapor pressure, static optical dielectric constant, ability to dissolve oxygen lithium peroxide. Room temperature liquids, which have high electrical wide window also low considered potential electrolytes batteries. Moreover,...
In recent years, there has been increased interest in fuel cells as a promising energy storage technology. The environmental impacts due to the extensive fossil consumption is becoming increasingly important greenhouse gas (GHG) levels atmosphere continue rise rapidly. Furthermore, cell efficiencies are not limited by Carnot limit, major thermodynamic limit for power plants and internal combustion engines. Therefore, hydrogen could provide long-term solution automotive industry, its search...
Today’s Li-ion technology is highly optimized for performance at relatively slow charging operation. However, significant challenges still present fast conditions (> 4C). These include large kinetic polarizations, concentration gradients, heat generation, and Li metal plating on the surface. In state-of-the-art batteries with high energy densities, electrodes are thick 100 μm), which leads to a tradeoff between density high-power performance. This because thicker tortuous pathway...
Metals, especially those with low standard electrode potentials, are attractive candidates for use as anodes in rechargeable batteries because of their generally higher capacities compared to intercalated graphite. In order be practical, these metals should efficiently plate and strip overpotentials during battery cycling. general, have thermodynamic kinetic contributions. An important contribution arises from heterogeneity the [de/ad]-sorption energy due inequivalent reaction sites on...
The morphological complexity and dynamical nature of microstructures make conventional continuum-level simulations, which often involve interfacial boundary conditions, challenging. In this talk, we will present the Smoothed Boundary Method (SBM), uses phase-field-like domain parameters to define bulk domains, where partial differential equations are solved, interfaces, conditions imposed. This method is straightforward in derivation simple numerical implementation. As a diffuse interface...
The advent of battery-powered electric vehicles has generated a need for batteries that are both energy and power dense. Traditionally, thick electrodes with heavy active material loading used enhancing the density battery. However, (with > 2.5 mAh/cm 2 ) limits ionic transport inside electrode, thereby limiting battery 1 . Decreasing thickness electrodes, as well increasing porosity, can enhance battery, but this increases fraction electrochemically inactive materials, such current...