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Cycling rate-induced spatially-resolved heterogeneities in commercial cylindrical Li-ion batteries

DOI: 10.1002/smtd.202100512 DOI Help

Authors: Antonios Vamvakeros (Finden Limited) , Dorota Matras (The Faraday Institution; Diamond Light Source) , Thomas E. Ashton (University College London (UCL)) , Alan A. Coelho (Coelho Software) , Hongyang Dong (University College London) , Dustin Bauer (University College London) , Yaroslav Odarchenko (Finden Limited) , Stephen W. T. Price (Finden Ltd) , Keith T. Butler (SciML) , Olof Gutowski (Deutsches Elektronen-Synchrotron DESY) , Ann-Christin Dippel (Deutsches Elektronen-Synchrotron DESY) , Martin Von Zimmerman (Deutsches Elektronen-Synchrotron DESY) , Jawwad Darr (University College London) , Simon D. M. Jacques (Finden Limited) , Andrew M. Beale (Finden Limited,; University College London; Research Complex at Harwell)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Small Methods , VOL 33

State: Published (Approved)
Published: August 2021

Open Access Open Access

Abstract: Synchrotron high-energy X-ray diffraction computed tomography has been employed to investigate, for the first time, commercial cylindrical Li-ion batteries electrochemically cycled over the two cycling rates of C/2 and C/20. This technique yields maps of the crystalline components and chemical species as a cross-section of the cell with high spatiotemporal resolution (550 × 550 images with 20 × 20 × 3 µm3 voxel size in ca. 1 h). The recently developed Direct Least-Squares Reconstruction algorithm is used to overcome the well-known parallax problem and led to accurate lattice parameter maps for the device cathode. Chemical heterogeneities are revealed at both electrodes and are attributed to uneven Li and current distributions in the cells. It is shown that this technique has the potential to become an invaluable diagnostic tool for real-world commercial batteries and for their characterization under operating conditions, leading to unique insights into “real” battery degradation mechanisms as they occur.

Journal Keywords: diffraction; Li-ion batteries; tomography; X-ray diffraction computed tomography

Diamond Keywords: Batteries; Lithium-ion

Subject Areas: Materials, Chemistry, Energy

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Other Facilities: P07 at PETRA III

Added On: 17/08/2021 13:29


Discipline Tags:

Energy Storage Energy Physical Chemistry Energy Materials Chemistry Materials Science

Technical Tags:

Imaging Tomography