A5056882529- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- Electron and X-Ray Spectroscopy Techniques
- Extraction and Separation Processes
- Supercapacitor Materials and Fabrication
- Nuclear Materials and Properties
- Semiconductor materials and devices
- Fusion materials and technologies
- Fuel Cells and Related Materials
- Semiconductor materials and interfaces
- Hydrogen embrittlement and corrosion behaviors in metals
- Nuclear reactor physics and engineering
- Advanced MRI Techniques and Applications
- Advanced Electron Microscopy Techniques and Applications
- Medical Imaging Techniques and Applications
- Transition Metal Oxide Nanomaterials
- Atomic and Subatomic Physics Research
- Non-Destructive Testing Techniques
- Molten salt chemistry and electrochemical processes
- Conducting polymers and applications
- Integrated Circuits and Semiconductor Failure Analysis
- Advancements in Photolithography Techniques
- Recycling and Waste Management Techniques
- Electrocatalysts for Energy Conversion
Argonne National Laboratory
2016-2025
Stanford University
2024-2025
Bridge University
2022
Shanghai Jiao Tong University
2022
University of Illinois Urbana-Champaign
1994-2020
Alex's Lemonade Stand Foundation
2020
Sandia National Laboratories California
2018
Budapest University of Technology and Economics
2013-2016
Urbana University
2010
Goodwin College
2010
X-ray photoelectron spectroscopy and scanning electron microscopy were used to study electrode samples obtained from 18650-type lithium-ion cells subjected accelerated calendar-life testing at temperatures ranging 25 70°C states-of-charge 40 80%. The contained -based positive electrodes (cathodes), graphite-based negative (anodes), a 1 M ethylene carbonate:diethyl carbonate (1:1) electrolyte. results electrochemically treated showed surface film formation on both electrodes. laminate...
The surface reactions of electrolytes with a silicon anode in lithium ion cells have been investigated. investigation utilizes two novel techniques that are enabled by the use binder-free (BF-Si) nanoparticle anodes. first method, transmission electron microscopy energy dispersive X-ray spectroscopy, allows straightforward analysis BF-Si solid electrolyte interphase (SEI). second method multi-nuclear magnetic resonance spectroscopy D2O extracts from cycled TEM and NMR data complemented XPS...
The surface reactions of electrolytes with the graphitic anode lithium ion batteries have been investigated. investigation utilizes two novel techniques, which are enabled by use binder-free graphite anodes. first method, transmission electron microscopy (TEM) energy dispersive X-ray spectroscopy, allows straightforward analysis solid electrolyte interphase (SEI). second method multi-nuclear magnetic resonance (NMR) spectroscopy D2O extracts from cycled TEM and NMR data complemented XPS FTIR...
Continuous operation of full cells with layered transition metal (TM) oxide positive electrodes (NCM523) leads to dissolution TM ions and their migration incorporation into the solid electrolyte interphase (SEI) graphite-based negative electrode. These processes correlate cell capacity fade accelerate markedly as upper cutoff voltage (UCV) exceeds 4.30 V. At voltages ≥4.4 V there is enhanced fracture during cycling that creates new surfaces causes increased solvent oxidation dissolution....
Abstract We developed a simple approach to carry out in situ electron microscopy of single Li‐ion battery cathode particles during electrochemical cycling. focused on Li(Ni 0.8 Co 0.15 Al 0.05 )O 2 ‐based materials because life‐cycle tests suggest strong contribution the material changes cell impedance. In scanning was carried operando cycling and at various stages by interrupted Our work revealed several important aspects oxide particle dynamics: significant separations develop between...
High-voltage layered lithium- and manganese-rich (LMR) oxides have the potential to dramatically enhance energy density of current Li-ion storage systems. However, these materials are currently not used commonly; one reason is their inability maintain a consistent voltage profile (voltage fade) during electrochemical cycling. This report rationalizes cause this fade by providing evidence spinel (LS) structural evolution pathways in host Li1.2Mn0.55Ni0.15Co0.1O2 oxide. By employing neutron...
Ionic liquids consisting of bis(fluorosulfonyl)imide (FSI–) anion show promise as electrolytes for Li-ion-based electric storage devices, they exhibit relatively low viscosity, high chemical stability, and form robust solid–electrolyte interphase (SEI) protecting liquid electrolyte from further breakdown on the electrode. These ionic have been reported to inhibit dendrite formation lithium metal lithiated graphite electrodes, which also relates unusual SEI properties. In this study, we...
An investigation of the interrelationship cycling performance, solution structure, and electrode surface film structure has been conducted for electrolytes composed different concentrations LiPF6 in propylene carbonate (PC) with a binder-free (BF) graphite electrode. Varying concentration changes altering predominant mechanism electrolyte reduction at interface. The change results solid interface (SEI) reversible cell. At low PC (1.2 M), electrochemical cyclic voltammetry (CV) BF electrodes...
Rechargeable lithium-ion batteries containing silicon-based negative electrodes have the potential to revolutionize electrical energy storage, but cyclic and acyclic organic carbonate solvents (such as ethylene propylene carbonates) that are commonly used in graphite Li-ion yield unsatisfactory performance when with such Li alloying electrodes. It has been found by trial error additions of closely related additive, fluoroethylene (FEC), conventional electrolytes yields a robust solid...
Battery performance is strongly correlated with electrode microstructural properties. Of the relevant properties, tortuosity factor of electrolyte transport paths through microstructure pores important as it limits battery maximum charge/discharge rate, particularly for energy-dense thick electrodes. Tortuosity however, difficult to precisely measure, and thus its estimation has been debated frequently in literature. Herein, three independent approaches have applied quantify lithium-ion The...
Abstract Due to the high lithium capacity of silicon, composite (blended) electrodes containing silicon (Si) and graphite (Gr) particles are attractive alternatives all‐Gr used in conventional lithium‐ion batteries. In this Communication, lithiation delithiation Si Gr a 15 wt% electrode is quantified for each component using energy dispersive X‐ray diffraction. This quantification important as components cycle different potential regimes, interpretation cycling behavior complicated by...
Spatial distribution of lithium cations in the graphite electrode a lithium-ion battery is quantified using <italic>operando</italic> energy dispersive X-ray diffraction.
Structural and electronic investigations were conducted on lithium nickel oxide-based particles used in positive electrodes of 18650-type high-power Li-ion cells. K-edge X-ray absorption spectroscopy (XAS) revealed trivalent Ni Co ions the bulk powder to prepare high power electrode laminates. Using oxygen XAS, resolution electron microscopy, nanoprobe diffraction, energy-loss spectroscopy, we identified a thick modified layer surface oxide particles, which results from loss Li ordering...
Whereas there are numerous experimental and computational studies of electrochemical reduction leading to the formation solid-electrolyte interface (SEI) in lithium-ion batteries, so far have been no direct spectroscopic observations radical intermediates involved SEI formation. In Part 1 this series, radiolysis laser photoionization carbonate electrolytes used observe identify these reaction using electron paramagnetic resonance spectroscopy. Our study indicates that suggested scenarios for...
Voltage fade of layered, Li-intercalating transition metal oxides is caused by irreversible, structural changes. A method that uses a resistance-corrected average voltage proposed to track and quantify in reproducible time-efficient manner. it used here compare several layered terms their degrees fade. The materials studied include some are current technological importance, such as LiNi0.8Co0.15Al0.05O2 (NCA), Li1.05(Ni1/3Mn1/3Co1/3)0.95O2 (NMC), Li1.2Ni0.15Mn0.55Co0.1O2, Li- Mn-rich NMC,...