A5052321107- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Electrocatalysts for Energy Conversion
- Supercapacitor Materials and Fabrication
- Advanced battery technologies research
- Semiconductor materials and devices
- Electron and X-Ray Spectroscopy Techniques
- Extraction and Separation Processes
- Graphene research and applications
- Graphene and Nanomaterials Applications
- 2D Materials and Applications
- Carbon Nanotubes in Composites
- Bone Tissue Engineering Materials
- Advanced Photocatalysis Techniques
- Laser-induced spectroscopy and plasma
- Force Microscopy Techniques and Applications
- Catalysis and Hydrodesulfurization Studies
- Dielectric materials and actuators
- Advanced Electron Microscopy Techniques and Applications
- Molten salt chemistry and electrochemical processes
- Electrospun Nanofibers in Biomedical Applications
- Polymer Nanocomposites and Properties
- Molecular Junctions and Nanostructures
- Silicon Nanostructures and Photoluminescence
University of Illinois Chicago
2015-2021
Abstract Widespread application of Li‐ion batteries (LIBs) in large‐scale transportation and grid storage systems requires highly stable safe performance the prolonged diverse service conditions. Oxygen release from oxygen‐containing positive electrode materials is one major structural degradations resulting rapid capacity/voltage fading battery triggering parasitic thermal runaway events. Herein, authors summarize recent progress understanding mechanisms oxygen phenomena correlative...
Electrocatalytic conversion of carbon dioxide (CO2) into energy-rich fuels is considered to be the most efficient approach achieve a neutral cycle. Transition-metal dichalcogenides (TMDCs) have recently shown very promising catalytic performance for CO2 reduction reaction in an ionic liquid electrolyte. Here, we report that molybdenum disulfide (MoS2), member TMDCs, can significantly improved by using appropriate dopant. Our electrochemical results indicate 5% niobium (Nb)-doped vertically...
Abstract Metal oxides with a tunnelled structure are attractive as charge storage materials for rechargeable batteries and supercapacitors, since the tunnels enable fast reversible insertion/extraction of carriers (for example, lithium ions). Common synthesis methods can introduce large cations such potassium, barium ammonium ions into tunnels, but how these affect performance is not fully understood. Here, we report role tunnel in governing electrochemical properties electrode by focusing...
Conformal Al<sub>2</sub>O<sub>3</sub> coating improves wettability of liquid electrolyte on lithium leading to homogenous electrodeposition, reduced dendrite growth, and improved cyclability.
Rechargeable zinc (Zn) batteries suffer from poor cycling performance that can be attributed to dendrite growth and surface-originated side reactions. Herein, we report of Zn metal anode improved significantly by utilizing monolayer graphene (Gr) as the electrodeposition substrate. Utilizing microscopy X-ray diffraction techniques, demonstrate electrodeposited on Gr substrate has a compact, uniform, nondendritic character. The layer, due its high lattice compatibility with Zn, provides low...
Thermal runaways triggered by the oxygen release from oxide cathode materials pose a major safety concern for widespread application of lithium ion batteries. Utilizing in situ aberration-corrected scanning transmission electron microscopy (STEM) and energy loss spectroscopy (EELS) at high temperatures, we show that LixCoO2 crystals is occurring surface particles. We correlated this local evolution structure with phase transitions spanning layered to spinel then rock salt upon exposure...
Abstract Direct formation of ultra-small nanoparticles on carbon supports by rapid high temperature synthesis method offers new opportunities for scalable nanomanufacturing and the stable multi-elemental nanoparticles. However, underlying mechanisms affecting dispersion stability during processing remain enigmatic. In this work, we report observation metallic stabilization through in situ Joule heating method. We find that is associated with simultaneous phase transition amorphous to a...
Abstract Dendritic growth of lithium (Li) has severely impeded the practical application Li‐metal batteries. Herein, a 3D conformal graphene oxide nanosheet (GOn) coating, confined into woven structure glass fiber separator, is reported, which permits facile transport Li‐ions thought its structure, meanwhile regulating Li deposition. Electrochemical measurements illustrate remarkably enhanced cycle life and stability anode, explained by various microscopy modeling results. Utilizing scanning...
Abstract Despite significant interest toward solid‐state electrolytes owing to their superior safety in comparison liquid‐based electrolytes, sluggish ion diffusion and high interfacial resistance limit application durable high‐power density batteries. Here, a novel quasi‐solid Li + conductive nanocomposite polymer electrolyte containing black phosphorous (BP) nanosheets is reported. The developed successfully cycled against metal (over 550 h cycling) at 1 mA cm −2 room temperature. cycling...
Despite their high energy densities, Li- and Mn-rich, layered-layered, xLi2MnO3·(1 - x)LiTMO2 (TM = Ni, Mn, Co) (LMR-NMC) cathodes require further development in order to overcome issues related bulk surface instabilities such as Mn dissolution, impedance rise, voltage fade. One promising strategy modify LMR-NMC properties has been the incorporation of spinel-type, local domains create "layered-layered-spinel" cathodes. However, precise control structure composition, well subsequent...
The progress on sodium‐ion battery technology faces many grand challenges, one of which is the considerably lower rate sodium insertion/deinsertion in electrode materials due to larger size (Na) ions and complicated redox reactions compared lithium‐ion systems. Here, it demonstrated that can be reversibly stored Zn‐Sb intermetallic nanowires at speeds exceed 295 nm s −1 . Remarkably, these values are three orders magnitude higher than sodiation other electrochemically tested with situ...
Abstract LiCoO 2 is a prime example of widely used cathodes that suffer from the structural/thermal instability issues lead to release their lattice oxygen under nonequilibrium conditions and safety concerns in Li‐ion batteries. Here, it shown an atomically thin layer reduced graphene oxide can suppress Li x CoO particles improve structural stability. Electrochemical cycling, differential electrochemical mass spectroscopy, scanning calorimetry, situ heating transmission electron microscopy...
The stability of cathode particle surfaces that are directly exposed to the electrolyte is one most crucial and determining factors for performance at high operating voltages. Theory has predicted a strong dependence surface on chemical compositions as well facets layered oxides, yet conflicting results correlations exist experimental studies focus cycled secondary particles recovered from composite electrodes. Herein, we synthesize well-formed Li[NixMnyCo1–x–y]O2 (NMC) single-crystal...
A schematic of the liquid-cell (S)TEM device and observed nucleation growth dynamics Au nanoparticles on MoS<sub>2</sub>.
Ni-rich LiNi1–x–yMnxCoyO2 (NMC) cathode materials are being aggressively developed for high-voltage applications such as electric vehicles. These desirable because of their high volumetric energy and power densities. However, degradation phenomena related to surface instabilities highly charged cathodes have been, remain, a major concern with respect cycle life safety Li-ion cells. Although many reports exist on the properties behavior materials, sufficient advances yet be made stabilization...
Abstract Electronic properties of silicon, the most important semiconductor material, are controlled through doping. The range achievable can be extended by hyperdoping, i.e., doping to concentrations beyond nominal equilibrium solubility dopant. Here, hyperdoping is achieved in a laser pyrolysis reactor capable providing nonequilibrium conditions, where governed kinetics rather than thermodynamics. High resolution scanning transmission electron microscopy (TEM) with energy‐dispersive X‐ray...
The decoration of two-dimensional (2D) substrates with nanoparticles (NPs) serve as heterostructures for various catalysis applications. Deep understanding catalyst degradation mechanisms during service conditions is crucial to improve the durability. Herein, we studied sintering behavior Pt and bimetallic Au-core Pt-shell (Au@Pt core–shell) NPs on MoS2 supports at high temperatures under vacuum, nitrogen (N2), hydrogen (H2), air environments by in situ gas-cell transmission electron...
Commercial poly methyl methacrylate (PMMA)-based cement is currently used in the field of orthopedics. However, it suffers from lack bioactivity, mechanical weakness, and monomer toxicity. In this study, a PMMA-based nanocomposite reinforced with hydroxyapatite (HA) nanofibers two-dimensional (2D) magnesium phosphate MgP nanosheets was synthesized optimized terms property cytocompatibility. The HA were using hydrothermal homogeneous precipitation method tuning crystallization...
Abstract Understanding the behavior of confined matter within Van der Waals (VdW) materials is complicated due to interplay various factors, including VdW interaction between interlayers, layer with matter, and bending strain energy layers accommodate encapsulation. Herein, new insight on magnitude pressure density water entrapped spaces in provided. This accomplished by studying plasmon excitation encapsulated two sheets graphene membranes an aberration‐corrected scanning transmission...
A new strategy for electrochemical interfaces that utilizes multilayer films deposited by atomic layer deposition (ALD) is introduced. Manganese-rich and nickel-rich cathode oxides were coated with a novel bilayer film of metal fluorides. Subsequent exposure to prolonged, high-voltage cycling vs graphite electrodes revealed the can greatly enhance stability oxides. In particular, in manganese-rich cells, capacity fade due manganese dissolution was substantially reduced impedance rise...