Investigation of cycling-induced microstructural degradation in silicon-based electrodes in lithium-ion batteries using X-ray nanotomography
Investigation of cycling-induced microstructural degradation in silicon-based electrodes in lithium-ion batteries using X-ray nanotomography
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DOI：
10.1016/j.electacta.2017.08.161
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发表时间：
2017-11
影响因子：
6.6
通讯作者：
Oluwadamilola O. Taiwo;M. Loveridge;S. Beattie;D. Finegan;R. Bhagat;D. Brett;P. Shearing
中科院分区：
文献类型：
--
作者：
Oluwadamilola O. Taiwo;M. Loveridge;S. Beattie;D. Finegan;R. Bhagat;D. Brett;P. Shearing
使用 X 射线纳米计算机断层扫描技术以 3D 方式研究了复合硅电极在循环寿命不同阶段的微观结构退化。复合电极的 36 μm × 27 μm × 26 μm 重建体积在其原始状态以及 1、10 和 100 个循环后进行成像。随着循环次数的增加，在电极内观察到颗粒破裂和相变。此外，还清楚地解析了一个明显的、较低的 X 射线衰减相，这可能与电解质击穿和硅颗粒相变导致的表面膜形成有关。跟踪定量微观结构特性的变化，例如相体积分数和颗粒比表面积。电极性能损失与活性硅的损失有关。这些成像结果进一步凸显了高分辨率 X 射线断层扫描研究电极微观结构在电池退化和故障中的作用的能力。
The microstructural degradation of a composite silicon electrode at different stages in its cycle life was investigated in 3D using X-ray nano-computed tomography. A reconstructed volume of 36 μm × 27 μm × 26 μm from the composite electrode was imaged in its pristine state and after 1, 10 and 100 cycles. Particle fracturing and phase transformation was observed within the electrode with increased cycling. In addition, a distinct, lower X-ray attenuating phase was clearly resolved, which can be associated with surface film formation resulting from electrolyte breakdown and with silicon particle phase transformation. Changes in quantified microstructural properties such as phase volume fraction and particle specific surface area were tracked. Electrode performance loss is associated with loss of active silicon. These imaging results further highlight the capability of high resolution X-ray tomography to investigate the role of electrode microstructure in battery degradation and failure.