In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2020-02, No. 1 ( 2020-11-23), p. 13-13
Abstract:
Today, the electrical power supplies pose increasingly stringent requirements on battery package, for example, ultrafast vehicles charging algorithms and high current power supplies. To enable the optimal combination of energy and power capability, it is essential to understand kinetic barriers at all applicable length scales and time scales. On the length scale, we developed single electrode particles of ~25 µm size of a few nAh and adopted it to zoom in the transport of the molecules within the solid|liquid interface, excluding the complicated factors from typical composite electrode microstructures. The particle level electrodynamic measurements conducted in varied electrolyte compositions, reveal the anion group effects in charge transport, which leads to a significantly higher materials utilization during fast charge/discharge in both the single-particle measurements and on macroscopic composite electrodes. Furthermore, molecular dynamics (MD) simulations identify the preferred solvation structures of the liquid electrolytes, and density functional theory (DFT) calculations of their binding energies reveal the origin of the anion group effect. The anion dependence and the solvation lead to the fast kinetics at the interface. On the time scale, we probed the ultrafast transport algorithm with high-frequency modulation. A modulated DC pulse charging and discharging with high-frequency waveforms (up to ~ MHz) are performed to investigate the interfacial transport. This study reveals a possible mechanism by which ion transport kinetics in a lithium-ion battery are responsive to megahertz frequency excitation. Such algorithms are aiming to improve active material utilization as well as cycle life dramatically. This work was supported as part of the NorthEast Center for Chemical Energy Storage (NECCES), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award # DESC0012583.
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2020-02113mtgabs
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2020
detail.hit.zdb_id:
2438749-6
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