Towards High Rate Li Metal Anodes: Enhanced Performance at High Current Density in a Superconcentrated Ionic Liquid

Steven Harvey, Anthony Burrell, Kalani Periyapperuma, Douglas MacFarlane, Cristina Pozo-Gonzalo, Maria Forsyth, Patrick Howlett, Elisabetta Arca, Chunmei Ban

Research output: Contribution to journalArticlepeer-review

25 Scopus Citations

Abstract

Although high energy density and fast charging rates are vital for future advanced battery applications such as electric vehicles (EVs), the impact of fast charge rates is not widely investigated for key technologies such as those based on lithium metal. Here, for the first time, Li metal deposition/dissolution in a superconcentrated ionic liquid (IL) is demonstrated at the high current densities necessary for fast charge technologies. Operation at high current is shown to enhance the cycling efficiency from 64 ± 3% at 1 mA cm-2 up to 96 ± 1% at 20 mA cm-2 on a bare Ni substrate, providing a new path to enable these technologies. XPS, ToF-SIMS and SEM measurements revealed that a stable and LiF-dominated SEI, favourable nucleation and compact dendrite-free Li morphology enabled enhanced cycling efficiency at higher currents.

Original languageAmerican English
Pages (from-to)3574-3579
Number of pages6
JournalJournal of Materials Chemistry A
Volume8
Issue number7
DOIs
StatePublished - 2020

Bibliographical note

Publisher Copyright:
© 2020 The Royal Society of Chemistry.

NREL Publication Number

  • NREL/JA-5K00-75576

Keywords

  • battery applications
  • fast charging
  • lithium batteries
  • storage

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