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Diffusion-Controlle...
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Huang, Yu-KaiUppsala universitet,Oorganisk kemi
(author)
Diffusion-Controlled Lithium Trapping in Graphite Composite Electrodes for Lithium-Ion Batteries
- Article/chapterEnglish2022
Publisher, publication year, extent ...
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2022-06-03
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John Wiley & Sons,2022
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electronicrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:uu-483592
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-483592URI
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https://doi.org/10.1002/aesr.202200042DOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Although graphite-based composite electrodes currently are widely used as negative electrodes in lithium-ion batteries due to their good cycle performances, improvements of their long-time cycling stability are still desirable. Herein, a series of lithium-metal half-cell experiments is performed to demonstrate that the diffusion-controlled lithium-trapping effect constitutes an additional, and so far, largely unrecognized, aging mechanism for graphite-based electrodes. This trapping effect, which stems from incomplete delithiation due to diffusion-controlled redistribution of intercalated lithium in graphite, is shown to account for around 30% of the total accumulated capacity loss during long-time cycling. The trapping effect is caused by the concentration gradients present at the end of the lithiation steps as these gradients result in lithium (i.e., coupled Li+ and e(-)) diffusion in the electrodes. As a result, a small fraction of the lithium becomes inaccessible on the timescale of the subsequent delithiation step. The results, however, also show that the inclusion of constant-voltage delithiation steps can increase the delithiation efficiency and decrease the influence of the lithium-trapping effect. This work consequently demonstrates that diffusion-controlled lithium-trapping effects need to be considered when trying to increase the lifetimes of graphite-based electrodes.
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Pettersson, JeanUppsala universitet,Analytisk kemi(Swepub:uu)jpe18455
(author)
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Nyholm, Leif,1961-Uppsala universitet,Institutionen för kemi - Ångström(Swepub:uu)lny18455
(author)
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Uppsala universitetOorganisk kemi
(creator_code:org_t)
Related titles
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In:Advanced Energy & Sustainability Research: John Wiley & Sons3:82699-9412
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