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Instruments / Technical Area	Publication Details	Published	Actions
I12-JEEP: Joint Engineering, Environmental and Processing	3D correlative imaging of lithium ion concentration in a vertically oriented electrode microstructure with a density gradient Chun Huang , Matthew Wilson , Kosuke Suzuki , Enzo Liotti , Thomas Connolley , Oxana Magdysyuk , Stephen Collins , Frederic Van Assche , Matthieu N Boone , Matthew C. Veale , Andrew Lui , Rhian-Mair Wheater , Chu Lun Alex Leung Advanced Science 92 DOI: 10.1002/advs.202105723 Diamond Proposal Number(s): [23400] Open Access Show Abstract ▼ Abstract: 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.	Apr 2022
B16-Test Beamline	X-ray microbeam characterisation of crystalline defects in small pixel GaAs:Cr detectors R. M. Wheater , L. Jowitt , S. Richards , M. C. Veale , M. D. Wilson , O. J. L. Fox , K. J. S. Sawhney , A. D. Lozinskaya , A. Shemeryankina , O. P. Tolbanov , A. Tyazhev , A. N. Zarubin Nuclear Instruments And Methods In Physics Research Section A: Accelerators, Spectrometers, Detectors And Associated Equipment DOI: 10.1016/j.nima.2021.165207 Diamond Proposal Number(s): [23500] Show Abstract ▼ Abstract: A newly supplied 80 × 80 chromium compensated GaAs sensor with a matrix of 80 × 80 pixels on a 250 m pixel pitch has been characterised utilising microbeam mapping techniques at the Diamond Light Source. The GaAs:Cr sensor was mounted to a HEXITEC DAQ system before raster scanning an x-ray beam with area 25 × 25 m in steps of 25 m, providing sub-pixel resolution spectroscopic imaging. Scans were performed with incident x-ray energies ranging from 12 to 45 keV. Following processing of the data in MatLab 2019b an analysis of defects previously observed in etched GaAs wafers occured. Findings indicate the presence of regions with reduced charge collection efficiency where up to 88 % of incident events show significant charge loss, and changing charge carrier lifetimes across the sensor.	Mar 2021

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