3D Correlative Imaging of Lithium Ion Concentration in a Vertically Oriented Electrode Microstructure with a Density Gradient.
3D Correlative Imaging of Lithium Ion Concentration in a Vertically Oriented Electrode Microstructure with a Density Gradient.
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DOI：
10.1002/advs.202105723
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发表时间：
2022-05
期刊：
影响因子：
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锂离子电池(LiBS)的性能受到电极中Li+离子浓度梯度的影响。尽管厚电极(≥300µm)有可能降低LIBS内非活性成分的比例并提高电池能量密度，但Li+离子浓度梯度问题却加剧了。由于锂的原子序数较低，对锂离子在电极中扩散的研究大多基于计算模型。很少有实验方法可以直观地显示典型配置的电池中电极的锂离子浓度分布，例如不锈钢外壳的硬币电池。在这里，首次开发了一种间断原位相关成像技术，将新颖的全场X射线康普顿散射成像与X射线计算机断层扫描相结合，使LiNi0.8Mn0.1Co0.1O2阴极的Li+化学计量比和电极微结构的3D像素逐个像素的映射，以关联工作硬币电池电池内电极的化学和物理性能。制备了具有垂直取向孔阵列和密度梯度的电极微结构。结果表明，所设计的电极微结构改善了Li+离子的扩散性，通过1 mm的超厚电极均匀了Li+离子的浓度，提高了电极活性物质的利用率。开发了一种间断原位相关成像技术，将新颖的全场X射线康普顿散射成像与互补X射线计算机层析成像相结合，允许对LiNi0.8Mn0.1Co0.1O2正极的Li+化学计量比和电极微结构进行逐像素的3D映射，以互相关工作硬币电池电池内电极的化学和物理性能。
The performance of Li+ ion batteries (LIBs) is hindered by steep Li+ ion concentration gradients in the electrodes. Although thick electrodes (≥300 µm) have the potential for reducing the proportion of inactive components inside LIBs and increasing battery energy density, the Li+ ion concentration gradient problem is exacerbated. Most understanding of Li+ ion diffusion in the electrodes is based on computational modeling because of the low atomic number (Z) of Li. There are few experimental methods to visualize Li+ ion concentration distribution of the electrode within a battery of typical configurations, for example, coin cells with stainless steel casing. Here, for the first time, an interrupted in situ correlative imaging technique is developed, combining novel, full‐field X‐ray Compton scattering imaging with X‐ray computed tomography that allows 3D pixel‐by‐pixel mapping of both Li+ stoichiometry and electrode microstructure of a LiNi0.8Mn0.1Co0.1O2 cathode to correlate the chemical and physical properties of the electrode inside a working coin cell battery. An electrode microstructure containing vertically oriented pore arrays and a density gradient is fabricated. It is shown how the designed electrode microstructure improves Li+ ion diffusivity, homogenizes Li+ ion concentration through the ultra‐thick electrode (1 mm), and improves utilization of electrode active materials. An interrupted in situ correlative imaging technique is developed, combining novel, full‐field X‐ray Compton scattering imaging with complementary X‐ray computed tomography that allows 3D pixel‐by‐pixel mapping of both Li+ stoichiometry and electrode microstructure of a LiNi0.8Mn0.1Co0.1O2 cathode to cross‐correlate the chemical and physical properties of the electrode inside a working coin cell battery.
DOI：
10.1021/jp411152s
发表时间：
2014-04-03
期刊：
The journal of physical chemistry. C, Nanomaterials and interfaces
影响因子：
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作者：
Roberts MR;Madsen A;Nicklin C;Rawle J;Palmer MG;Owen JR;Hector AL
通讯作者：
Hector AL