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arXiv 1503.07655cond-mat.mtrl-sci
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圆柱型锂离子电池中锂分布的均匀性

Homogeneity of lithium distribution in cylinder-type Li-ion batteries

A. Senyshyn, M. J. Mühlbauer, O. Dolotko, M. Hofmann, H. Ehrenberg

摘要:

本文用2 × 2 × 20 mm ~ 3的空间分辨中子粉末衍射技术,对18650型锂离子电池石墨阳极的锂浓度进行了现场测量。在实际电池操作条件下结合电化学测量和X射线计算机断层成像进行的结构研究明确地揭示了石墨阳极中锂分布的不均匀性。偏离均匀的行为已被发现在径向和轴向方向的18650型电池,并在电池的几何形状和电极的电连接的框架中进行了讨论,这可能会发挥至关重要的作用,在每个电极内的活性物质中的锂分布的均匀性。

英文摘要:

Spatially-resolved neutron powder diffraction with gauge volume 2x2x20 mm3 has been applied to probe the lithium concentration in the graphite anode of different Li-ion cells of 18650-type in situ in charged state. Structural studies performed in combination with electrochemical measurements and X-ray computed tomography under real cell operating conditions unambiguously revealed non-homogeneity of lithium distribution in the graphite anode. Deviations from a homogeneous behaviour have been found in both radial and axial directions of 18650-type cells and were discussed in the frame of cell geometry and electrical connection of electrodes, which might play a crucial role in the homogeneity of the lithium distribution in the active materials within each electrode.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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