A5080388799- Advanced Battery Materials and Technologies
- Advanced battery technologies research
- Membrane-based Ion Separation Techniques
- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- Fuel Cells and Related Materials
- Biodiesel Production and Applications
- 2D Materials and Applications
- Polymer Nanocomposites and Properties
- Dielectric materials and actuators
- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Membrane Separation Technologies
- Thermal Expansion and Ionic Conductivity
- Pigment Synthesis and Properties
- Chalcogenide Semiconductor Thin Films
- Catalysis and Hydrodesulfurization Studies
- Ionic liquids properties and applications
University of Tennessee at Knoxville
2020-2022
Oak Ridge National Laboratory
2021-2022
Lawrence Berkeley National Laboratory
2021
University of California, San Diego
2021
University of California, Berkeley
2021
Oak Ridge Associated Universities
2021
Tennessee Technological University
2015
The impact of the binding, solution structure, and dynamics poly(vinylidene fluoride) (PVDF) with silicon on its performance as compared to traditional graphite Li1.05Ni0.33Mn0.33Co0.33O2 (NMC) electrode materials was explored. Through refractive index (RI) measurements, concentration binder adsorbed surface during processing determined be less than half potentially available material resulting in excessive free solution. Using ultrasmall-angle neutron scattering (USANS) small-angle (SANS),...
This study reports a sodium polysulfide catholyte for nonaqueous redox flow batteries (RFBs). We demonstrate reversible capacities up to 200 mAh/gS with negligible fade over 250 cycles at room temperature polysulfide∣biphenyl full cells containing Na+ß''-Al2O3 solid electrolyte (BASE) membranes. Interestingly, formation of insoluble S and Na2S4 phases did not inhibit the catholyte's cycle life which is likely due low concentrations used in lab-scale prototypes. 3-electrode galvanostatic AC...
Solvent-in-salt electrolytes (SISEs) are a promising alternative to the currently used in commercial devices. Despite SISEs' advantages, their utilization is not yet realized due poor mobility of chemical species. We explore this problem by adding chloroform SISE formed acetonitrile and Li-salt. First, we performed illustrative cycling experiments highlight potential approach. Then, focused on description microscopic dynamics exposed relevant aspects be considered for optimal performance....
Electrolyte stability can be improved by incorporating complexing agents that bind key decomposition intermediates and slow down decomposition. We show hexamethyl-phosphoramide (HMPA) extends both the thermal threshold of sodium hexafluorophosphate (NaPF6) in dimethoxyethane (DME) electrolyte cycle life double-layer capacitors. HMPA forms a stable complex with PF5, an intermediate PF6 anion degradation. Unbound, this leads to autocatalytic degradation solution. The results electrochemical...
We report the direct deposition of model sodium sulfide films by RF magnetron sputtering from Na2S and Na2S2 targets. Analytical characterization electrochemical cycling indicate that deposited are amorphous with stoichiometries correspond to Na2S3 formed targets, respectively. propose loss Na in case target is due preferential resulting higher energy required break Na–S bonds Na2S. The development thin film sulfides opens a new route understanding their fundamental properties, such as Na+...
We report on the effectiveness of sodium-exchanged Nafion membranes for inhibiting polysulfide crossover during redox flow battery operation. The solubility polysulfides allows them to be used as a high-capacity catholyte nonaqueous batteries (NARFB). NARFB cathode capacity is controlled by total tank volume and concentration and, such, independent adsorption sites carbon fibers or nanotubes found within traditional Na Li–S batteries. However, one major barriers realization NARFBs associated...
Herein we report on using a well known pigment that was used by ancient Egyptians and called Egyptian blue as an anode material for Li-ion batteries (background photo Kokhanchikov <italic>via</italic> Adobe Stock).
The development of hybrid electric vehicles (HEV) and portable electronic devices has caused greater demand for high energy power density typically in the form batteries, but supercapacitors are being integrated into these devices. Supercapacitors boast densities (10 4 W/kg), long cycle lives (>100,000), simplicity fabrication. One issue that arises practical use HEVs is instability electrolyte at elevated temperatures (above 60° C) working environment. A number sytems systems unstable...