Horizontal Centripetal Plating in the Patterned Voids of Li/Graphene Composites for Stable Lithium-Metal Anodes

Aoxuan Wang, Xinyue Zhang, Ying Wei Yang, Jiaxing Huang, Xingjiang Liu, Jiayan Luo*

*Corresponding author for this work

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

Lithium (Li) metal, the anode of choice for its high energy density, was used before the 1990s but was abandoned because of its dendrite formation. There are many strategies to address the dendrite problems, but the Li growth direction is largely normal to the anodes and there are still chances that the dendrites can cross over the separator. Here, we fundamentally suppress dendrites by designing horizontal centripetal Li plating. In patterned reduced graphene oxide (rGO)/Li anodes, the electric field is detoured to the edges of the patterned anodes. Li nucleates at the void edges of the layered Li separated by rGO sheets and grows horizontal centripetally to fill the voids. The patterned rGO/Li anodes were cycled for more than 2,000 hr and maintained stable voltage profiles at a current density of 10 mA cm−2. We anticipate that the horizontal centripetally grown behavior could revolutionize the design of high-performance Li-metal batteries. Li-metal anodes are the ideal anodes for their high energy density, but the safety and cycling stability are obstacles preventing their commercialization. This is due to the high reducibility of Li and its uncontrolled dendritic deposition. In various strategies proposed to solve the dendrite problem, the Li growth direction is largely normal to the anodes, and there are still chances that the dendrites can cross over the separator and short circuit the battery. Moreover, there is large thickness fluctuation of the Li anode during plating and stripping. Herein, we report a fundamentally revolutionary approach to suppressing dendrite by designing horizontal centripetally grown Li-metal anodes with patterned rGO/Li composite anodes. Li nucleates at the edges of the empty area in the patterned anodes and grows horizontal centripetally. The horizontal centripetally grown Li-metal anodes are advantageous with mitigated thickness fluctuation and long cycling stability. The dendrite problem is fundamentally suppressed by horizontal centripetal plating of Li in the patterned voids of reduced graphene oxide/Li composite anodes. The mitigated thickness fluctuation and homogeneous Li+ distribution enable high performance in both half and full cells. The patterned composite anodes are promising for developing high-energy-density Li-metal batteries.

Original languageEnglish (US)
Pages (from-to)2192-2200
Number of pages9
JournalChem
Volume4
Issue number9
DOIs
StatePublished - Sep 13 2018

Keywords

  • Li-metal anode
  • SDG7: Affordable and clean energy
  • composite
  • graphene
  • horizontal centripetally grown
  • patterning

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Biochemistry, medical
  • Materials Chemistry

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