期刊
BATTERIES & SUPERCAPS
卷 4, 期 2, 页码 327-335出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/batt.202000178
关键词
lithiated graphite; Li-ion batteries; lithium concentration; heterogeneity; neutron diffraction
资金
- German Ministry of Education and Science [05K16VK2, 05K19VK3]
- Heinz Maier-Leibnitz Zentrum
- DFG Gottfried Wilhelm Leibniz program
- Projekt DEAL
The two-dimensional lithium distribution in graphite anodes of Li-ion batteries was probed non-destructively using neutron diffraction, revealing non-uniformities in the lithiation state of most cells. These non-uniformities were correlated to electrode configuration and materials, affecting the intrinsic state-of-charge distribution and potentially the aging behavior of the electrodes.
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据