A5011186786- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Semiconductor materials and devices
- Advanced battery technologies research
- nanoparticles nucleation surface interactions
- Semiconductor Quantum Structures and Devices
- Supercapacitor Materials and Fabrication
- Inorganic Chemistry and Materials
- Semiconductor Lasers and Optical Devices
- Conducting polymers and applications
- Polyoxometalates: Synthesis and Applications
- Theoretical and Computational Physics
- Electrocatalysts for Energy Conversion
- Extraction and Separation Processes
- Diatoms and Algae Research
- Electron and X-Ray Spectroscopy Techniques
- Quantum Dots Synthesis And Properties
- Ion-surface interactions and analysis
- Fiber-reinforced polymer composites
- Catalytic Processes in Materials Science
- Chemical Synthesis and Characterization
- Electronic and Structural Properties of Oxides
- Thermal Expansion and Ionic Conductivity
- Perovskite Materials and Applications
Catholic University of America
2020-2024
University of America
2020-2024
University of Maryland, College Park
2012-2021
Park University
2020
Physical Sciences (United States)
2014
Lithium metal is considered to be the most promising anode for next-generation batteries due its high energy density of 3840 mAh g–1. However, extreme reactivity Li surface can induce parasitic reactions with solvents, contamination, and shuttled active species in electrolyte, reducing performance employing anodes. One solution this issue application thin chemical protection layers surface. Using a custom-made ultrahigh vacuum integrated deposition characterization system, we demonstrate...
Substantial efforts are underway to develop all‐solid‐state Li batteries (SSLiBs) toward high safety, power density, and energy density. Garnet‐structured solid‐state electrolyte exhibits great promise for SSLiBs owing its Li‐ion conductivity, wide potential window, sufficient thermal/chemical stability. A major challenge of garnet is that the contact between Li‐metal anodes poor due rigidity garnet, which leads limited active sites large interfacial resistance. This study proposes a new...
A stable Na metal anodeis is reported by forming an artificial solid electrolyte interphase via a low-temperature plasma-enhanced atomic layer deposition technology. It discovered that ultrathin of Al2O3 (2.8 nm) can protect from decomposition, prevent 3D dendrite formation, and significantly enhance its cycle stability in carbonate-based electrolyte.
We demonstrate an atomic layer deposition (ALD) process for the solid electrolyte lithium phosphorousoxynitride (LiPON) using tert-butoxide (LiOtBu), H2O, trimethylphosphate (TMP), and plasma N2 (PN2) as precursors. use in-situ spectroscopic ellipsometry to determine growth rates optimization design a rational, quaternary precursor ALD where only certain substrate–precursor chemical reactions are favorable. via XPS tunable nitrogen incorporation into films by variation of PN2 dose find that...
Li metal is among the most attractive anode materials for secondary batteries, with a theoretical specific capacity > 3800 mAh g–1. However, its extremely low electrochemical potential associated high chemical reactivity that results in undesirable reduction of electrolyte species on lithium surface, leading to spontaneous formation solid interphase (SEI) uncontrolled composition, morphology, and physicochemical properties. Here, we demonstrate new approach stabilize anodes using hybrid...
Several active areas of research in novel energy storage technologies, including three-dimensional solid state batteries and passivation coatings for reactive battery electrode components, require conformal electrolytes. We describe an atypical atomic layer deposition (ALD) process a member the lithium phosphorus oxynitride (LiPON) family, which is employed as thin film lithium-conducting electrolyte. The reaction between tert-butoxide (LiOtBu) diethyl phosphoramidate (DEPA) produces...
We demonstrate the ultraclean atomic layer deposition (ALD) of Li2O and LiOH using lithium tert-butoxide (LiOtBu) precursor with H2O plasma O2 as oxidants, along conversion products to Li2CO3 upon CO2 dosing. Using LiOtBu results in below 240 °C above for otherwise identical process parameters. Substituting oxidation a combination products, indicating modification ALD reaction preventing volatilization C from Li precursor. The chemistry films is definitively characterized first time XPS...
Abstract Lithium‐ion batteries (LIBs) are integral parts of modern technology, but can raise safety concerns because their flammable organic electrolytes with low flash points. Aqueous be used in LIBs to overcome the issues that come while avoiding poor kinetics associated solid state electrolytes. Despite advances aqueous electrolytes, current collectors for battery systems have been neglected. Current today's usually metal‐based materials, which heavy, expensive, bulky, and prone corrosion...
Chemical and electrochemical instability of the Li metal interface with organic solvent has been a major impediment to use Li‐metal anodes for next‐generation batteries. Here character surface degradation application atomic layer deposition (ALD) as protection suppress are addressed. Using standard foil samples in without situ deposited ALD Al 2 O 3 protective layers, results from force microscopy, mass spectrometry (including differential spectrometry), X‐ray Photoelectron Spectroscopy...
Carbon nanomaterials are desirable candidates for lightweight, highly conductive, and corrosion-resistant current collectors. However, a key obstacle is their weak interconnection between adjacent nanostructures, which renders orders of magnitude lower electrical conductivity mechanical strength in the bulk assemblies. Here we report an "epitaxial welding" strategy to engineer carbon nanotubes (CNTs) into crystalline interconnected structures. Solution-based polyacrylonitrile was conformally...
Materials that undergo conversion reactions to form different materials upon lithiation typically offer high specific capacity for energy storage applications such as Li ion batteries. However, since the reaction products often involve complex mixtures of electrically insulating and conducting particles significant changes in volume phase, reversibility is poor, preventing their use rechargeable (secondary) In this paper, we fabricate protect 3D electrodes by first coating multiwalled carbon...
Lithium-sulfur (Li-S) batteries suffer from shuttle reactions during electrochemical cycling, which cause the loss of active material sulfur sulfur-carbon cathodes, and simultaneously incur corrosion degradation lithium metal anode by forming passivation layers on its surface. These unwanted therefore lead to fast failure batteries. The preservation highly reactive in sulfur-containing electrolytes has been one main challenges for Li-S In this study, we systematically controlled optimized...
High-energy conversion electrodes undergo successive Li insertion and during lithiation. A primary scientific obstacle to harnessing the potentially high lithium storage capabilities of electrode materials has been formation insulating new phases throughout reactions. These are chemically stable, electrochemically irreversible if formed in large amounts with coarsening. Herein, we synthesized FeOF material as a model system mechanistically demonstrate that thin solid electrolyte [lithium...
ConspectusIn the pursuit of energy storage devices with higher and power, new ion materials high-voltage battery chemistries are paramount importance. However, they invite—and often enhance—degradation mechanisms, which reflected in capacity loss charge/discharge cycling sometimes safety problems. Degradation mechanisms driven by fundamentals such as chemical electrochemical reactions at electrode–electrolyte interfaces, volume expansion stress associated insertion extraction, profound...
Lithium metal batteries bring greater promise for energy density, often relying on solid‐state electrolytes to meet critical benchmarks. However, Li dendrite formation is a prevailing problem that limits the cycle life and Coulombic efficiency of batteries. For first time, thin (<100 nm) layer electronically insulating, ionically conducting lithium phosphorus oxynitride (LiPON) applied using atomic deposition between anode garnet 7 La 3 Zr 2 O 12 (LLZO). The performance conformal LiPON as...
Sodium metal batteries have garnered significant attention due to their high theoretical specific capacity, cost effectiveness, and abundant availability. However, the propensity for dendritic sodium formation, stemming from highly reactive nature of surface, poses safety concerns, uncontrollable formation solid–electrolyte interphase (SEI) leads large cell impedance battery failures. In this study, we present a novel approach where successfully developed stable fluorinated artificial SEI...
We investigated the catalytic activity of different coating layers and put forward a selection criterion for surface layers. Al<sub>2</sub>O<sub>3</sub> could effectively suppress HER enable cycling Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> anode in water-in-salt electrolyte, with capacity 145 mA h g<sup>−1</sup>.
In combining organometallic with organic precursors, molecular layer deposition (MLD) offers not only an expanded portfolio of combinations but specifically the possibility tuning mechanical properties for more robust functionality. This is appealing applications in energy storage, where ion transport and out electrodes causes significant stress/strain cycling. It particularly opportune Li-ion solid state batteries (LISSBs), electrode electrolyte structures are usually arranged densely high...
Mg<sup>2+</sup> ions in electrolytes can catalyze the polymerization of 1,3-dioxolane to form poly-DOL while anion pairs affect their capability.
Li 10 GeP 2 S 12 (LGPS) is a superionic conductor that has an ionic conductivity matching conventional liquid electrolytes (10 −3 cm −1 ) and thus shows exceptional potential to fulfill the promise of solid-state metal batteries. Conventional mechanical die pressing LGPS powder into pellets for electrochemical testing can result in large porosity, low density, grain boundary resistance at solid-solid interface with electrodes which greatly decrease performance LGPS, addition poor stability...
Among the many emerging technologies under investigation as alternatives to successful Lithium-ion battery, magnesium battery is promising due wide availability of magnesium, its high volumetric capacity, and possibility for safety improvements. One largest challenges facing rechargeable batteries formation a passivation layer at Mg metal anode interface when reactive species in electrolyte are reduced electrode-electrolyte interface. To control solid interphase Lithium batteries, protective...
Pressed LGPS pellets after cycling in contact with Li metal. 20 nm of ALD LiPON deposited directly onto the allows longer lifetimes (in this case, 90 cycles) at reduced overpotential than bare LGPS, which fails 64 cycles.
We present the results of kinetic Monte Carlo simulations homoepitaxial growth on a patterned substrate in presence an extra barrier to diffusing adatom crossing steps from above (Ehrlich-Schwoebel barrier) topographically surfaces. Our indicate that over wide range Ehrlich-Schwoebel heights, incident atom fluxes, and temperatures multilayer islands or ``growth mounds'' grow arrangements which are directed by topographical pattern. series should form as temperature is changed due competition...
FeF3 (iron(III) fluoride) is a promising conversion cathode material that possesses theoretical specific capacity of 712 mAh/g, which significantly higher than those commercial layered cathodes, and it paves the way for realizing Co-free, low-cost advanced batteries portable electronics, transportation, grids. Here, we report development thin-film cathodes by sputtering deposition technique. The chemistry stoichiometry sputtered thin films are confirmed energy-dispersive X-ray spectroscopy...