锂离子电池产品碳负极结构随充电过程的变化

Takashi Kamiyama , Yuki Narita , Hirotaka Sato , Masato Ohnuma , Yoshiaki Kiyanagi
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引用次数: 15

摘要

利用中子布拉格边缘成像技术对锂离子电池产品进行了研究。这种无损中子成像方法适用于工业产品的评价,但应用于多组分产品存在一定的困难。LIB包括一个强中子散射体和一个吸收体,因此是在实际产品测量中使用中子成像的合适测试案例。在本研究中,我们分析了石墨阳极结构随电池充电水平变化的变化。实验是在北海道大学中子源设施(HUNS)使用紧凑型中子源进行的。为了消除散射中子污染的影响,我们首先确定了将这种影响降低到1%以下所需的样品和探测器之间的距离。利用这种分离,测量了阳极结构对电荷水平的依赖性。在中子透射谱上可以识别出石墨{002}布拉格边缘。随着电池电量的增加,布拉格边发生了位移和变宽。边缘与多个石墨结构阶段的存在相一致。不同电荷水平的层间距分布图像显示了LIB晶格平面上的不均匀波动。在此基础上,分析了石墨结构阶段的比例。各阶段的比例随充电水平而变化,在最终充电状态下,石墨层填充锂离子的理想嵌入结构较少。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Structural Change of Carbon Anode in a Lithium-ion Battery Product Associated with Charging Process Observed by Neutron Transmission Bragg-edge Imaging

Spectroscopic neutron Bragg-edge imaging was performed to study a lithium-ion battery (LIB) product. This non-destructive neutron imaging method is suitable for the evaluation of industrial products, but presents some difficulties for application to multicomponent products. The LIB includes a strong neutron scatterer and an absorber, and is thus a suitable test case for the use of neutron imaging in actual product measurement. In this study, we analyzed the variation of the graphite anode structure with changes in the battery charge level. The experiments were carried out using the compact neutron source at the Hokkaido University neutron source facility (HUNS). To eliminate the effect of scattered neutron contamination, we first determined the distance between the sample and detector required to reduce this effect to under 1%. Using this separation, the charge level dependence of the anode structure was measured. The graphite {002} Bragg-edge could be recognized on the neutron transmission spectra. The Bragg-edge was shifted and broadened with increasing battery charge. The edge was consistent with the existence of multiple graphite structural stages. The layer spacing distribution images for different charge levels showed the inhomogeneous fluctuation on the LIB lattice plane. Based on the images the fraction of the graphite structural stages were analyzed. The ratio of each stage varied with the charge level, and the ideal intercalation structure, in which the graphite layers are stuffed with Li-ions, was found to be minor in the final charging state.

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