Heterogeneity of Graphite Lithiation in State‐of‐the‐Art Cylinder‐Type Li‐Ion Cells,Batteries & Supercaps

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Heterogeneity of Graphite Lithiation in State‐of‐the‐Art Cylinder‐Type Li‐Ion Cells
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-10-28 , DOI: 10.1002/batt.202000178
Dominik Petz _{1,

2} , Martin J. Mühlbauer _{1,

3,

4} , Alexander Schökel _{1,

4,

5} , Klaus Achterhold ₆ , Franz Pfeiffer _{6,

7} , Thilo Pirling ₈ , Michael Hofmann ₁ , Anatoliy Senyshyn ₁

Affiliation

The two‐dimensional lithium distribution in the graphite anode was non‐destructively probed by spatially resolved neutron diffraction for a batch consisting of 34 different cylinder‐type (18650) Li‐ion batteries in fully charged state. The uniformity of the lithium distribution was quantified and correlated to the cell specifications/electrochemistry and to intrinsic cell parameters like electrode thickness, position of current collectors, etc. which were obtained by X‐ray micro‐computed tomography. Non‐uniformities in the lithiation state of the anode from a constant plateau have been observed for the majority of the studied cells. Their location corresponds to the positions of current tabs connecting the electrode stripes and areas of incomplete electrode coating at the beginning and the end of the electrode stripes. Four commonly used schemes of current lid connection were identified. Each of them displays its own effect on the uniformity of the lithiation at the anode and, therefore, variation of the intrinsic state‐of‐charge distribution and, most probably, the ageing behavior of the electrodes.

中文翻译：

先进的圆柱型锂离子电池中石墨化锂的异质性

石墨阳极中的二维锂分布通过空间分辨中子衍射法无损探测了一批由34个充满电的圆柱型（18650）锂离子电池组成的批次。锂分布的均匀性被量化，并与电池规格/电化学以及与固有电池参数（如电极厚度，集电器的位置等）相关联，这些参数是通过X射线微计算机断层扫描获得的。对于大多数研究的电池，已经观察到阳极的锂化状态从恒定的平台不均匀。它们的位置对应于连接电极条的电流接线片的位置以及在电极条的开始和末端的电极涂层不完整的区域。确定了当前盖连接的四种常用方案。它们中的每一个都对阳极锂化的均匀性以及其固有电荷状态分布的变化以及电极的老化行为表现出自己的影响。

更新日期：2020-10-28

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