Browsing by Author "Wang, Lubing"
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Item Electrochemical Modeling of Fast Charging in Batteries(Advanced Energy Materials, 2024-04-18) Duan, Xudong; Hu, Dayong; Chen, Weiheng; Li, Jiani; Wang, Lubing; Sun, Shuguo; Xu, JunThe acceleration of fast charging capabilities has emerged as a pivotal objective within the realms of the battery, electric vehicle, and energy storage sectors. However, the classical electrochemical models are not able to describe voltages of the cell (Ucell), anode (Ua), and cathode (Uc) at high C-rates. Herein, Ucell, Ua,, and Uc are experimentally obtained under various C-rates (0.1–2C) and identified the charge transfer resistance of the cathode (RCT,c) as the primary rate-limiting factor. Thus, the anode is established as a multi-scale coupling model with Fick's law and phase separation model applied, to discuss their effect on Ua and Li-ion concentration prediction. 2D reconstruction structures for the cathode is established with RCT,c effect considered. Finally, the Ua, Uc, and Ucell are successfully predicted at different C-rates. Results propose an accurate and versatile electrochemical model and highlight the importance of considering limiting factors in electrochemical modeling for fast charging.Item Investigation of the lithium plating triggering criterion in graphite electrodes(Journal of Materials Chemistry A: materials for energy and sustainability, 2024-04-16) Li, Jiani; Wang, Lubing; Xu, JunLithium plating is considered an undesirable side reaction because it can induce capacity fading and pose safety concerns in Li-ion batteries. The timely detection of lithium plating onset is crucial for both mechanistic investigations and ensuring the safe and durable operation of batteries. In this study, discharging tests were conducted by varying the set capacity in graphite/Li cells to induce lithium plating on the graphite electrode. Based on a comprehensive analysis of the voltage curves and the morphological characterization of disassembled cells, the inflection point on the differential voltage curve during the discharging process was identified as the precise onset time of lithium plating. Electrochemical models were developed to further elucidate the mechanisms governing the onset of lithium plating. Compared with the model based on the potential criterion, the model employing the concentration criterion demonstrated enhanced precision in predicting lithium plating, particularly under high C rates. Based on the model with the concentration criterion, the discharging protocol was optimized parametrically to achieve high discharging efficiency and restrain lithium plating. This nuanced understanding contributes to determining the onset of lithium plating more accurately, thereby facilitating a more robust battery design and durable yet fast charging protocols.