The Experts below are selected from a list of 90 Experts worldwide ranked by ideXlab platform
William A. Goddard - One of the best experts on this subject based on the ideXlab platform.
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Pulse-Reverse Protocol for Efficient Suppression of Dendritic Micro-structures in Rechargeable Batteries
Electrochimica Acta, 2021Co-Authors: Asghar Aryanfar, Yara Ghamlouche, William A. GoddardAbstract:Abstract The ramified and stochastic evolution of dendritic microstructures has been a major issue on the safety and longevity of rechargeable batteries, particularly for the utilization metallic electrodes. We computationally develop pulse-reverse protocols for effective halting of the growing microstructures during extensive charging periods far beyond inter-Ionic Collisions. Our framework is based on the competitiveness of the dendritic growth during the pulse period versus the dissolution of the (sub)branches during the reverse charge. The detachment of the atoms from the structure preferentially occurs from the meta-stable sites which possess the lowest coordination number and require lowest activation energy for dissolution. We prove that even an infinitesimal pulse-reverse charge is more effective than an extended pulse-relaxation method for the suppression of the dendritic structures.
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Finite-pulse waves for efficient suppression of evolving mesoscale dendrites in rechargeable batteries.
Physical Review E, 2019Co-Authors: Asghar Aryanfar, Michael R. Hoffmann, William A. GoddardAbstract:The ramified and stochastic evolution of dendritic microstructures has been a major issue on the safety and longevity of rechargeable batteries, particularly for the utilization of high-energy metallic electrodes. We analytically develop criteria for the pulse characteristics leading to the effective halting of the ramified electrodeposits grown during extensive timescales beyond inter-Ionic Collisions. Our framework is based on the competitive interplay between diffusion and electromigration and tracks the gradient of Ionic concentration throughout the entire cycle of pulse-rest as a critical measure for heterogeneous evolution. In particular, the framework incorporates the Brownian motion of the ions and investigates the role of the geometry of the electrodeposition interface. Our experimental observations verify the analytical developments, where the dimension-free developments allows the application to the electrochemical systems of various scales.
Asghar Aryanfar - One of the best experts on this subject based on the ideXlab platform.
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Pulse-Reverse Protocol for Efficient Suppression of Dendritic Micro-structures in Rechargeable Batteries
Electrochimica Acta, 2021Co-Authors: Asghar Aryanfar, Yara Ghamlouche, William A. GoddardAbstract:Abstract The ramified and stochastic evolution of dendritic microstructures has been a major issue on the safety and longevity of rechargeable batteries, particularly for the utilization metallic electrodes. We computationally develop pulse-reverse protocols for effective halting of the growing microstructures during extensive charging periods far beyond inter-Ionic Collisions. Our framework is based on the competitiveness of the dendritic growth during the pulse period versus the dissolution of the (sub)branches during the reverse charge. The detachment of the atoms from the structure preferentially occurs from the meta-stable sites which possess the lowest coordination number and require lowest activation energy for dissolution. We prove that even an infinitesimal pulse-reverse charge is more effective than an extended pulse-relaxation method for the suppression of the dendritic structures.
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Finite-pulse waves for efficient suppression of evolving mesoscale dendrites in rechargeable batteries.
Physical Review E, 2019Co-Authors: Asghar Aryanfar, Michael R. Hoffmann, William A. GoddardAbstract:The ramified and stochastic evolution of dendritic microstructures has been a major issue on the safety and longevity of rechargeable batteries, particularly for the utilization of high-energy metallic electrodes. We analytically develop criteria for the pulse characteristics leading to the effective halting of the ramified electrodeposits grown during extensive timescales beyond inter-Ionic Collisions. Our framework is based on the competitive interplay between diffusion and electromigration and tracks the gradient of Ionic concentration throughout the entire cycle of pulse-rest as a critical measure for heterogeneous evolution. In particular, the framework incorporates the Brownian motion of the ions and investigates the role of the geometry of the electrodeposition interface. Our experimental observations verify the analytical developments, where the dimension-free developments allows the application to the electrochemical systems of various scales.
S A Yakovleva - One of the best experts on this subject based on the ideXlab platform.
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estimating inelastic heavy particle hydrogen collision data ii simplified model for Ionic Collisions and application to barium hydrogen Ionic Collisions
Astronomy and Astrophysics, 2017Co-Authors: A K Belyaev, S A YakovlevaAbstract:Aims. A simplified model is derived for estimating rate coefficients for inelastic processes in low-energy Collisions of heavy particles with hydrogen, in particular, the rate coefficients with high and moderate values. Such processes are important for non-local thermodynamic equilibrium modeling of cool stellar atmospheres. Methods. The derived method is based on the asymptotic approach for electronic structure calculations and the Landau-Zener model for nonadiabatic transition probability determination. Results. It is found that the rate coefficients are expressed via statistical probabilities and reduced rate coefficients. It is shown that the reduced rate coefficients for neutralization and ion-pair formation processes depend on single electronic bound energies of an atomic particle, while the reduced rate coefficients for excitation and de-excitation processes depend on two electronic bound energies. The reduced rate coefficients are calculated and tabulated as functions of electronic bound energies. The derived model is applied to barium-hydrogen Ionic Collisions. For the first time, rate coefficients are evaluated for inelastic processes in Ba + + H and Ba 2+ + H − Collisions for all transitions between the states from the ground and up to and including the Ionic state.
Michael R. Hoffmann - One of the best experts on this subject based on the ideXlab platform.
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Finite-pulse waves for efficient suppression of evolving mesoscale dendrites in rechargeable batteries.
Physical Review E, 2019Co-Authors: Asghar Aryanfar, Michael R. Hoffmann, William A. GoddardAbstract:The ramified and stochastic evolution of dendritic microstructures has been a major issue on the safety and longevity of rechargeable batteries, particularly for the utilization of high-energy metallic electrodes. We analytically develop criteria for the pulse characteristics leading to the effective halting of the ramified electrodeposits grown during extensive timescales beyond inter-Ionic Collisions. Our framework is based on the competitive interplay between diffusion and electromigration and tracks the gradient of Ionic concentration throughout the entire cycle of pulse-rest as a critical measure for heterogeneous evolution. In particular, the framework incorporates the Brownian motion of the ions and investigates the role of the geometry of the electrodeposition interface. Our experimental observations verify the analytical developments, where the dimension-free developments allows the application to the electrochemical systems of various scales.
E. Pollack - One of the best experts on this subject based on the ideXlab platform.
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Atomic and Ionic Collisions
Advances In Atomic Molecular and Optical Physics, 2005Co-Authors: E. PollackAbstract:Abstract Experimental and theoretical studies of collision processes provide insights into the basic interactions between particles. This review addresses Collisions between both Ionic and atomic projectiles with selected targets. A brief introduction outlines some of the experimental techniques used in the laboratory and suggests how the results can be presented. A substantial amount of data is being acquired by unmanned space missions but much of the data cannot be interpreted because relevant experimental results are not yet available. Many of the important collision processes involve multi-charged ions in the solar wind as well as the keV energy hydrogen atoms generated by the proton component. In this context, the role of the solar wind in the X-ray emissions found from the “atmospheres” of comets as they approach the sun is briefly discussed. Particular attention is given to the X-ray spectrum of the important O6+ + CO → O5+ collision. Processes involving keV energy H0 Collisions with H2, O2, and N2 molecules are important in the aurora and discussed with particular emphasis on how the results can best be presented. Collisions involving H+ with SO2 are important in the atmosphere of the Jovian Moon Io and optical results are presented. The concluding section is on the interactions of highly charged ions with surfaces and Collisions of highly-charged S ions with a highly oriented pyrolytic graphite surface are reviewed.
