Multi-Scale Heterogeneity of Electrode Reaction for 18650-Type Lithium-Ion Batteries during Initial Charging Process

IF 4.6 4区 化学 Q2 ELECTROCHEMISTRY
Dechao Meng, Zifeng Ma, Linsen Li
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引用次数: 0

Abstract

The improvement of fast-charging capabilities for lithium-ion batteries significantly influences the widespread application of electric vehicles. Fast-charging performance depends not only on materials but also on the battery’s inherent structure and the heterogeneity of the electrode reaction. Herein, we utilized advanced imaging techniques to explore how the internal structure of cylindrical batteries impacts macroscopic electrochemical performance. Our research unveiled the natural 3D structural non-uniformity of the electrodes, causing heterogeneity of electrode reaction. This non-uniformity of reaction exhibited a macro–meso–micro-scale feature in four dimensions: the exterior versus the interior of the electrode, the middle versus the sides of the cell, the inside versus the outside of the cell, and the surface versus the body of the electrode. Furthermore, the single-coated side of the anode demonstrated notably faster reaction than the double-coated sides, leading to the deposition of island-like lithium during fast charging. These discoveries offer novel insights into multi-scale fast-charging mechanisms for commercial batteries, inspiring innovative approaches to battery design.
18650 型锂离子电池在初始充电过程中电极反应的多尺度异质性
锂离子电池快速充电能力的提高极大地影响着电动汽车的广泛应用。快速充电性能不仅取决于材料,还取决于电池的固有结构和电极反应的异质性。在此,我们利用先进的成像技术探索了圆柱形电池的内部结构如何影响宏观电化学性能。我们的研究揭示了电极天然的三维结构不均匀性,从而导致电极反应的异质性。这种反应的不均匀性在四个维度上呈现出宏观-中观-微观尺度的特征:电极外部与内部、电池中间与两侧、电池内部与外部、电极表面与主体。此外,阳极单面涂层的反应速度明显快于双面涂层,从而导致在快速充电过程中出现岛状锂沉积。这些发现为商业电池的多尺度快速充电机制提供了新的见解,激发了电池设计的创新方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Batteries
Batteries Energy-Energy Engineering and Power Technology
CiteScore
4.00
自引率
15.00%
发文量
217
审稿时长
7 weeks
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