Selection of Redox Mediators for Reactivating Dead Li in Lithium Metal Batteries

Jie Chen, Zexiao Cheng, Yaqi Liao, Lixia Yuan, Zhen Li, Yunhui Huang

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Li metal batteries have suffered from dendrite growth and its derived dead Li formation for a long time. A new lithium restoration method through the shuttling of redox mediators has been proposed recently. However, the side reaction of severe self-discharge often occurs when some redox mediators are used. Here, a selection principle of redox mediators for reactivating dead Li in lithium metal batteries is put forward, which is able to reactivate the dead Li effectively and reduce the self-discharge at the same time. Three redox mediators of ferrocene (Fc), 10-methylphenothiazine (MPT), and thianthrene (Th) with different redox potentials are tested in LiFePO4|Cu anode-free Li metal batteries to clarify the selection principle. Furthermore, 2,2,6,6-tetramethylpiperidinooxy (TEMPO), which is speculated to be a suitable one for reactivating dead Li in lithium metal batteries, is verified. This work provides a universal selection principle of redox mediators and may boost its practical application in Li metal batteries.
Original languageEnglish (US)
JournalAdvanced Energy Materials
Volume12
Issue number40
DOIs
StatePublished - Oct 27 2022
Externally publishedYes

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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