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Diffusion-Controlled Lithium Trapping in Graphite Composite Electrodes for Lithium-Ion Batteries
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- Huang, Yu-Kai (author)
- Uppsala universitet,Oorganisk kemi
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- Pettersson, Jean (author)
- Uppsala universitet,Analytisk kemi
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- Nyholm, Leif, 1961- (author)
- Uppsala universitet,Institutionen för kemi - Ångström
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(creator_code:org_t)
- 2022-06-03
- 2022
- English.
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In: Advanced Energy & Sustainability Research. - : John Wiley & Sons. - 2699-9412. ; 3:8
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Abstract
Subject headings
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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.
Subject headings
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- diffusion
- graphite electrodes
- lithium trapping
- lithium-ion batteries
- lithium-metal half cells
Publication and Content Type
- ref (subject category)
- art (subject category)
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