Stable Lithium Plating and Stripping Enabled by a LiPON Nanolayer on PP Separator

Yuncong PANG, Min GUAN, Yilan PAN, Mao TIAN, Kai HUANG, Chunzhi JIANG, Andrew XIANG, Xinquan WANG, Yongji GONG*, Yong XIANG*, Xiaokun ZHANG*

*Corresponding author for this work

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

8 Citations (Scopus)

Abstract

The practical application of the Li metal anode (LMA) is hindered by its low coulombic efficiency and dendrite formation. Although solid-state electrolytes hold promise as ideal partners for LMA, their effectiveness is limited by the poor workability and ionic conductivity. Herein, a modified separator combining the rapid Li+ transport of a liquid electrolyte and the interfacial stability of a solid-state electrolyte is explored to realize stable cycling of the LMA. A conformal nanolayer of LiPON is coated on a polypropylene separator by a scalable magnetron sputtering method, which is compatible with current Li-ion battery production lines and promising for the practical applications. The resulting LMA–electrolyte/separator interface is Li+-conductive, electron-insulating, mechanically and chemically stable. Consequently, Li|Li cells maintain stable dendrite-free cycling with overpotentials of 10 and 40 mV over 2000 h at 1 and 5 mA cm-2, respectively. Additionally, the Li|LiFePO4 full cells achieve a capacity retention of 92% after 550 cycles, confirming its application potential.

Original languageEnglish
Article number2104832
Number of pages9
JournalSmall
Volume18
Issue number26
Early online date2 Jun 2022
DOIs
Publication statusPublished - 1 Jul 2022
Externally publishedYes

Bibliographical note

Y.P. and M.G. contributed equally to this work. This work was supported in part by startup research funding from the University of Electronic Science and Technology of China (grant no Y03019023601008001).

Keywords

  • coulombic efficiencies
  • Li dendrites
  • Li metal anodes
  • Li metal batteries
  • separator modifications
  • solid electrolytes

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