Probing lithiation and delithiation of thick sintered lithium-ion battery electrodes with neutron imaging
Probing lithiation and delithiation of thick sintered lithium-ion battery electrodes with neutron imaging
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DOI：
10.1016/j.jpowsour.2019.02.075
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发表时间：
2019-04-15
影响因子：
9.2
通讯作者：
Koenig, Gary M., Jr.
中科院分区：
文献类型：
--
作者：
Nie, Ziyang;McCormack, Patrick;Koenig, Gary M., Jr.
随着锂离子电池的普及和应用范围的扩大，需要了解和利用电化学性能的限制。探索锂离子电池的内部过程可以深入了解电池的电化学特性以及合理设计电池所需的信息。在这篇手稿中，原位方法，中子成像，应用于锂离子全电池，以跟踪在放电过程中的电极中的锂化/脱锂过程。所述电极包括仅活性材料的厚烧结膜，这改善了针对通过电极的中子强度的净变化而映射的离散点的数量。锂化/脱锂过程与电池的Li+浓度和放电曲线的计算定性一致。这些结果表明，中子成像可以通过实验探测和确认锂离子全电池电化学性能的局限性，特别是具有厚电极的那些。
As lithium-on (Li-ion) batteries increase in their prevalence and the range of applications expands, there is a need to understand and exploit the limits of electrochemical performance. Probing the internal processes in Li-ion batteries provides insights into the electrochemical characteristics of the cells as well as information necessary for rational cell design. In this manuscript an in situ method, neutron imaging, is applied to Li-ion full cells to track the lithiation/delithiation processes in the electrodes during discharge. The electrodes comprise thick sintered films of only active material, which improves the number of discrete points that are mapped for net changes in neutron intensity through the electrode. The lithiation/delithiation processes are qualitatively consistent with calculations of the Li+ concentration and discharge profiles of the cells. These results illustrate that neutron imaging can experimentally probe and confirm limitations in the electrochemical performance of Li-ion full cells, particularly those with thick electrodes.