Voltage-Induced Bromide Redox Enables Capacity Restoration of Fast-Charging Batteries
© 2024 Wiley‐VCH GmbH.
| Veröffentlicht in: | Advanced materials (Deerfield Beach, Fla.). - 1998. - (2024) vom: 20. Dez., Seite e2414207 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2024
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| Zugriff auf das übergeordnete Werk: | Advanced materials (Deerfield Beach, Fla.) |
| Schlagworte: | Journal Article Br−/Br3− redox capacity restoration dead lithium fast charging practical batteries |
| Zusammenfassung: | © 2024 Wiley‐VCH GmbH. Fast-charging lithium-ion batteries (LIBs) are essential for electric vehicles (EVs) to compete with conventional gasoline ones in terms of charging viability, yet the aggressive capacity drop in fast-charging scenarios gives rise to concerns regarding durability and sustainability. Herein, it is clarified that for fast-charging batteries, the excessive lithium (Li) plating on graphite anode inevitably brings capacity fading, and the concurrent accumulation of Li2O-dominant passivation species that form dead Li is the main reason for their poor rechargeability. To refresh the passivated graphite, a voltage-induced activation mechanism is developed to leverage bromide (Br-/Br3 -) redox couple for Li2O and isolated Li0 activation in situ. Along with a tiny amount of lithium bromide (LiBr) added into the electrolyte, the cut-off voltage of activation processes is controlled to initiate and maximize the effectiveness of Br-/Br3 - redox couple. The capacity of degraded fast-charging cells can increase from lower than 30 to ≈118 mAh g-1 before and after the activation, respectively. Notably, the process is not one-off; a subsequent activation is feasible. For the same battery that suffered from another round of fast charging, this design still restores the reversible capacity to ≈100 mAh g-1. Such a voltage-mediated mechanism can effectively prolong the service life of practical fast-charging batteries |
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| Beschreibung: | Date Revised 21.12.2024 published: Print-Electronic Citation Status Publisher |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202414207 |