Inter-layer-calated Thin Li Metal Electrode with Improved Battery Capacity Retention and Dendrite Suppression

Xi CHEN, Mingwei SHANG, Junjie NIU*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

62 Citations (Scopus)

Abstract

An inter-layer-calated thin Li metal (ILC-Li) electrode using nondelaminated 2D Ti3C2Tx MXene stacks (15 μm) coated on a thin Li host (30 μm) was developed. The excellent electrical conductivity and expanded interlayer space of the MXene provide a fast e-/Li+ transport while the layer limits the Li growth along the perpendicular direction, thus largely mitigating the dendrite growth. The highly reversible Li deposition/extraction greatly reduces the dead lithium and electrolyte consumption by forming a thin solid-electrolyte-interphase (SEI) layer. A small overpotential of less than 135 mV in symmetric cells was achieved after >1050 cycles at 10 mA cm-2 and 10 mAh cm-2. In a full cell, the battery exhibited an improved capacity retention when compared with Li foil, particularly with lean electrolyte of 2.5 μL mAh-1, thus leading to a high energy density up to 366.6 Wh/kg. The current approach is manufacture scalable, which displays promising potentials in lithium ion batteries. Copyright © 2020 American Chemical Society.
Original languageEnglish
Pages (from-to)2639-2646
Number of pages8
JournalNano Letters
Volume20
Issue number4
Early online date17 Mar 2020
DOIs
Publication statusPublished - 8 Apr 2020
Externally publishedYes

Bibliographical note

Materials synthesis and battery tests were performed at the Energy Storage Lab of University of Wisconsin-Milwaukee (UWM). XRD and 3D confocal microscopy characterizations were done at the Advanced Analysis Facility (AAF), UWM. SEM imaging was carried out at Electron Microscopy Lab of UWM Biology Department. Atomic resolution S/TEM imaging and EDS mapping were collected at the University of Illinois at Chicago (UIC). XPS tests were performed at the facility of NUANCE Center at Northwestern University. X.C. thanks Bangxing Li and Yingying lv for helpful discussions. All authors acknowledge the support from the Research Growth Initiative (RGI) and UW System Applied Research Grant Program (ARG).

Keywords

  • Dendrite
  • Li metal electrode
  • Lithium ion batteries
  • MXene

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