Emerging chemical heterogeneities in a commercial 18650 Li-ion battery during early cycling Article Swipe

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Dorota Matras , Thomas E. Ashton , Hongyang Dong , Marta Mirolo , Isaac Martens , Jakub Drnec , Jawwad A. Darr , Paul D. Quinn , Simon D. M. Jacques , Andrew M. Beale , Antonis Vamvakeros ·

YOU? · · 2022 · Open Access · · DOI: https://doi.org/10.26434/chemrxiv-2022-4b442-v2

Synchrotron X-ray diffraction computed tomography (XRD-CT) was employed to study a commercial 18650 cylindrical LiNi0.8Co0.15Al0.5O2 (NCA) battery under operating conditions and during seven cycles. Multiple chemical heterogeneities related to the lithium distribution were observed in both the cathode and the anode from the analysis of the spatially-resolved diffraction signals. It is shown that during the battery charging, the anode exhibits different degrees of activity regarding the lithiation process. Explicitly, the following three regions were identified: uniform/homogenous lithiation, delayed lithiation and inactive-to-lithiation regions. The inactive-to-lithiation anode region was a result of the specific cell geometry (i.e. due to lack of cathode tape opposite these anode areas) and throughout the cycling experiments remained present in the form of LiC30-30+. The delayed lithiation region was seen to have a direct impact on the properties of NCA in its close proximity during the battery discharging, preventing its full lithiation. Further to this, the aluminum tab negatively affected the NCA in direct contact with it, leading to different lattice parameter a and c evolution compared to the rest of the cathode.

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Anode Cathode Battery (electricity) Materials science Synchrotron Diffraction Ion Aluminium Lithium-ion battery Cycling Analytical Chemistry (journal) Electrode Chemical engineering Composite material Chemistry Thermodynamics Physics Optics Physical chemistry Organic chemistry History Chromatography Power (physics) Archaeology Engineering

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Type: preprint
Language: en
Landing Page: https://doi.org/10.26434/chemrxiv-2022-4b442-v2
PDF: https://chemrxiv.org/engage/api-gateway/chemrxiv/assets/orp/resource/item/625bd521ed4d88c3770df67e/original/emerging-chemical-heterogeneities-in-a-commercial-18650-li-ion-battery-during-early-cycling.pdf
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DOI: https://doi.org/10.26434/chemrxiv-2022-4b442-v2

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Title: Emerging chemical heterogeneities in a commercial 18650 Li-ion battery during early cycling

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Language: en

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Publication year: 2022

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Publication date: 2022-04-18

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Authors: Dorota Matras, Thomas E. Ashton, Hongyang Dong, Marta Mirolo, Isaac Martens, Jakub Drnec, Jawwad A. Darr, Paul D. Quinn, Simon D. M. Jacques, Andrew M. Beale, Antonis Vamvakeros

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Landing page: https://doi.org/10.26434/chemrxiv-2022-4b442-v2

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Concepts: Anode, Cathode, Battery (electricity), Materials science, Synchrotron, Diffraction, Ion, Aluminium, Lithium-ion battery, Cycling, Analytical Chemistry (journal), Electrode, Chemical engineering, Composite material, Chemistry, Thermodynamics, Physics, Optics, Physical chemistry, Organic chemistry, History, Chromatography, Power (physics), Archaeology, Engineering

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