A5086052722- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Image Processing Techniques and Applications
- Electrical and Bioimpedance Tomography
- Advanced battery technologies research
- Analytical Chemistry and Sensors
- Acoustic Wave Resonator Technologies
- Conducting polymers and applications
University of California, San Diego
2023-2025
Oak Ridge National Laboratory
2021-2023
Oak Ridge Associated Universities
2021
Solid-state lithium batteries are uniquely suited for operation at elevated to even high temperatures (>100 °C). Under these conditions, however, oxide cathode materials unstable with high-conductivity sulfide-based electrolytes while elemental sulfur suffers from poor utilization due its insulating nature. Here, we developed an ionic liquid mediated synthesis procedure polythiocynogen (poly-SCN) and applied it as a sulfur-rich cathode. The material, uniform, submicrometer particle size > 55...
The mechanical properties of lithium-ion batteries (LIB) are closely related to their state-of-charge (SOC) and state-of-health (SOH). Here, we introduce an in-operando acoustic technique based on impedance spectroscopy (AIS) which probes the changes that occur in LIB during operation. Using thin, inexpensive piezoelectric resonators widely available analyzers, can identify resonances commercial LIBs by measuring complex electrical resonator. In-operando AIS shows these dependent bulk LIB,...
In this work we compare the effects of Li<sup>+</sup> conducting ceramic fillers in a gel composite electrolyte vs dry electrolyte. The strategy to effectively utilize achieve synergy electrolytes is discussed.
In lithium metal battery research, coin cells (CC) are the most widely used laboratory instrument in academic settings. However, results thus obtained often don’t translate into pouch cell (PC) performance, which is regarded as a more reliable indicator for commercial relevance. Using both experimental and computational results, we show here that root cause lies pressure distribution these two formats. CCs suffer from severe inhomogeneity due to geometry of wave spring apply stack. Replacing...
Currently, one of the key challenges preventing wide commercialization polymer-based solid-state batteries is achieving high-rate capabilities. This work unravels chain structure and segmental dynamics in a composite cathode consisting LiFePO4 (LFP), carbon, poly(ethylene oxide) (PEO) with lithium bis(trifluoromethanesulfonyl)imide. Small-angle neutron scattering (SANS) data reveal that PEO chains are adsorbed on surface LFP particles during slurry processing to make electrode. The strong...
In lithium metal battery research, coin cells (CC) are the most widely used laboratory instrument in academic settings. However, results thus obtained often don’t translate into pouch cell (PC) performance, which is regarded as a more reliable indicator for commercial relevance. Using both experimental and computational results, we show here that root cause lies pressure distribution these two formats. CCs suffer from severe inhomogeneity due to geometry of wave spring apply stack. Replacing...
Current state-of-charge (SOC) and state-of-health (SOH) estimation techniques for commercial Li-ion batteries (LIB) rely almost exclusively on voltage measurements current integration, which produce large errors. Recently, acoustic techniques, primarily ultrasonic time-of-flight (US-ToF) have been used to reduce these errors, though cost, size, limitations prevent widespread use. Here, we introduce a practical alternative technique based impedance spectroscopy (AIS). Using thin, cheap...