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Your search keyword '"Huang, Pingyuan"' showing total 13 results
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13 results on '"Huang, Pingyuan"'

12. In Situ Characterization and Phase‐Filed Modeling of the Interaction between Dendrites and Gas Bubbles during an Electrochemical Process.

Author

Gao, Li Ting, Huang, Pingyuan, Feng, Jiemin, Zhu, Ruidie, and Guo, Zhan‐Sheng

Subjects
DENDRITIC crystals, BUBBLES, STRUCTURAL design, GASES, LITHIUM cell electrodes, LITHIATION
Abstract

The extrusion of dendrites and gas bubbles can lead to the appearance of dead lithium, which seriously reduces the coulomb efficiency, hindering the rapid development of high‐energy batteries. Therefore, it is very important to study the internal mechanism of the interaction between lithium dendrites and gas bubbles during electrochemical processes. In this paper, we have designed and developed a special in situ observation device for investigating the dendrite behavior. We also modified the phase‐field model to study the growth of lithium dendrites on the electrode with bubbles. The cantilever beam theory was applied to study the interaction between lithium dendrites and gas bubbles. The observed effects comprise the coalescence of gas bubbles, changing of lithium‐ion transport path on graphite electrode surface near the gas bubble, and bending of dendrites in front of the bubble. The local variation in the lithiation speed can be attributed to the insulating properties of the gas bubbles. Phase‐field simulation results of the interaction between dendrites and gas bubbles were consistent with the experimental results. A deeper insight into the gas‐bubble behaviors during dendrite growth with the presented simulation and experiment techniques becomes possible, which could be helpful to choose an appropriate structural design for reducing bubbles and lithium dendrites. [ABSTRACT FROM AUTHOR]

Published
2021
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13. Understanding Charge-Transfer and Mass-Transfer Effects on Dendrite Growth and Fast Charging of Li Metal Battery

Author

Gao, Li Ting, Huang, Pingyuan, and Guo, Zhan-Sheng

Abstract

Lithium (Li) metal is facing the challenge of poor cyclic performance and potential safety hazards caused by Li dendrites growth. Herein, the role of charge-transfer and mass-transfer process on dendrite growth and fast charging is illustrated. The effects of charge-transfer coefficient, applied current density, concave-convex structure, and properties of artificial solid electrolyte interphase (SEI) on guiding the Li dendrite growth are investigated via an electrochemical multiphysics model. The charge-transfer coefficient is meaningful for regulating the redox rate of electrode surface. Large applied current density and high ion conductivity of artificial SEI influence the distribution of local deposition rate significantly. Different deposition behaviors are found on concave and convex Li metal surfaces. The convex surface is sensitive than concave surface and is easy to generate Li dendrites under the conditions of high applied current density and high ion conductivity. Moreover, the experimental results can well reflect the influence of dendrite growth and dead Li on the capacity. This study not only provides an essential perspective on designing the artificial SEI for resolving the harmful dendrite issues but also boosts the practical applicability of Li metal battery.

Published
2023
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