Daniel Risskov Sørensen, Ronald Gordon, Anna Smith, Innokenty Kantor, Mads Ry Vogel Jørgensen
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引用次数: 0
摘要
研究高电流速率下的锂离子电池对推动电动汽车的快速充电越来越重要。在这里,我们使用最先进的同步加速器仪器和探测器,在 1C 和 3C 下对单层袋状电池进行空间分辨 X 射线衍射测量。通过对数十万张获得的衍射图进行批量细化,可以探究电池循环引起的整个电池的电极锂化不均匀性。研究发现,这种不均匀性在很大程度上取决于 C 速率,细胞中心的电化学活性通常高于靠近边缘的区域。在高电流速率下,预期的石墨阳极锂化阶段顺序不再成立。此外,还发现电极的某些区域与其他区域的表现截然不同,这可能是由于局部电阻不同造成的。这些行为只有在使用操作中方法的高 C 速率下才能检测到。使用这项工作中开发的方法可以研究接近商业尺寸的袋式电池。
In Operando Evaluation of Heterogeneity Development in Fast-Cycled Single-Layer Pouch Cells
Investigating Li-ion batteries during high current rates is becoming increasingly important to advance fast charging of electric vehicles. Here, we use a state-of-the-art synchrotron instrument and detector to measure spatially resolved X-ray diffraction in operando on single-layer pouch cells at 1C and 3C. Using batch refinement on the hundreds of thousands of obtained diffractograms, the electrode lithiation inhomogeneity across the cells induced by cell cycling could be probed. The inhomogeneity was found to depend significantly on C-rate, and the cells were generally more electrochemically active in the center than close to the edges. At high current rates, the expected sequence of lithiated stages in the graphite anode was found to no longer hold. Areas of the electrodes were also found to behave very differently from others, probably due to local differences in resistance. These behaviors are detectable only at high C-rates using in operando methods. Using the methods developed in this work allows for investigating pouch cells that are close to commercial sizes.
期刊介绍:
The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.