Correlative full field X-ray Compton scattering imaging and X-ray computed tomography for in situ observation of Li ion batteries
Correlative full field X-ray Compton scattering imaging and X-ray computed tomography for in situ observation of Li ion batteries
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DOI：
10.1016/j.mtener.2022.101224
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发表时间：
2022-12
影响因子：
9.3
通讯作者：
Chu Lun Alex Leung;M. Wilson;T. Connolley;S. Collins;O. Magdysyuk;Matthieu Boone;Kosuke Suzuki;M. Veale;E. Liotti;F. Van Assche;A. Lui;Chun Huang
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文献类型：
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作者：
Chu Lun Alex Leung;M. Wilson;T. Connolley;S. Collins;O. Magdysyuk;Matthieu Boone;Kosuke Suzuki;M. Veale;E. Liotti;F. Van Assche;A. Lui;Chun Huang
增加电极厚度作为提高锂离子电池能量密度的一种潜在途径受到越来越多的关注，尽管锂离子在放电过程中的可实现容量和倍率能力通常受到锂离子扩散的限制，特别是在放电速率增加的情况下。在商业标准电池几何结构中，例如不锈钢外壳的硬币电池，可视化和量化电极内低原子序数的Li+化学计量分布仍然具有挑战性。在这里，我们绘制了锂离子化学化学计量学分布在工作硬币电池内部的电极微观结构中，以显示电极材料的数量有助于储能性能，使用创新的situcorrelative full-field x射线康普顿散射成像（XCS-I）和x射线计算机断层扫描（XCT）。我们采用定向冰模板法设计并制造了一种超厚（~ 1mm）的lini0.8 mn0.1 co0.1 o2阴极，其微观结构包含垂直定向孔阵列。这项新技术为三维结构中低原子序数元素的映射和研究微观结构如何提高Li+离子的扩散率和储能性能开辟了新的途径。
Increasing electrode thickness is gaining more attention as a potential route to increase energy density for Li ion batteries although the realizable capacity and rate capability are usually limited by Li+ion diffusion during (dis)charge, especially at increased (dis)charge rates. It remains challenging to visualize and quantify the low atomic number Li+chemical stoichiometry distribution inside the electrode within commercially standard battery geometry, e.g. coin cells with stainless steel casings. Here, we map the distribution of Li+chemical stoichiometry in the electrode microstructure inside a working coin cell battery to show the amount of electrode materials contributing to energy storage performance using innovativein situcorrelative full-field X-ray Compton scattering imaging (XCS-I) and X-ray computed tomography (XCT). We design and fabricate an ultra-thick (∼1 mm) cathode of LiNi0.8Mn0.1Co0.1O2with a microstructure containing vertically oriented pore arrays using a directional ice templating method. This novel technique paves a new way to map low atomic number elements in 3D structures and study how the microstructure improves Li+ion diffusivity and energy storage performance.