石墨
材料科学
衍射
电极
硅
锂(药物)
离子
X射线晶体学
复合数
X射线
分析化学(期刊)
光电子学
光学
化学
复合材料
物理
内分泌学
物理化学
有机化学
医学
色谱法
作者
Donal P. Finegan,Antonis Vamvakeros,Lei Cao,C. S. Tan,Thomas M. M. Heenan,Sohrab R. Daemi,Simon D. M. Jacques,Andrew M. Beale,Marco Di Michiel,Kandler Smith,Dan J. L. Brett,Chunmei Ban
出处
期刊:Nano Letters
[American Chemical Society]
日期:2019-05-13
卷期号:19 (6): 3811-3820
被引量:72
标识
DOI:10.1021/acs.nanolett.9b00955
摘要
Optimizing the chemical and morphological parameters of lithium-ion (Li-ion) electrodes is extremely challenging, due in part to the absence of techniques to construct spatial and temporal descriptions of chemical and morphological heterogeneities. We present the first demonstration of combined high-speed X-ray diffraction (XRD) and XRD computed tomography (XRD-CT) to probe, in 3D, crystallographic heterogeneities within Li-ion electrodes with a spatial resolution of 1 μm. The local charge-transfer mechanism within and between individual particles was investigated in a silicon(Si)-graphite composite electrode. High-speed XRD revealed charge balancing kinetics between the graphite and Si during the minutes following the transition from operation to open circuit. Subparticle lithiation heterogeneities in both Si and graphite were observed using XRD-CT, where the core and shell structures were segmented, and their respective diffraction patterns were characterized.
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