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Electrochemically Controlled Solid Electrolyte Interphase Layers Enable Superior Li-S Batteries.

Yang Wang, Chuan-Fu Lin, Jiancun Rao

  • 1Graduate School of Nanoscience and Technology , KAIST , Daejeon 305-701 , South Korea.

ACS Applied Materials & Interfaces
|June 30, 2018
PubMed
Summary
This summary is machine-generated.

Researchers optimized lithium metal anode pretreatment to create a stable solid electrolyte interphase (SEI) layer. This significantly enhances lithium-sulfur battery performance and lifespan by preventing degradation and improving capacity.

Keywords:
Li metal anodesLi−S batteriesanode protectionelastomerelectrochemical pretreatmentelectropolymerizationsolid electrolyte interphase layer

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Lithium-sulfur (Li-S) batteries face challenges from shuttle reactions, leading to active material loss and lithium metal anode degradation.
  • Preserving the reactive lithium metal anode in sulfur-containing electrolytes is crucial for Li-S battery longevity.

Purpose of the Study:

  • To systematically control and optimize the formation of a uniform solid electrolyte interphase (SEI) on lithium metal anodes.
  • To improve the electrochemical performance and stability of Li-S batteries through anode pretreatment.

Main Methods:

  • Electrochemical pretreatment of lithium metal anodes at controlled current densities.
  • Characterization of SEI layer using X-ray photoelectron spectroscopy, focused-ion beam cross sectioning, and scanning electron microscopy.
  • Performance evaluation of Li-S cells with pretreated vs. untreated anodes.

Main Results:

  • Pretreated Li anodes formed a smooth, uniform SEI layer, distinct from untreated anodes.
  • Li-S cells with pretreated anodes showed improved specific capacity and power capability.
  • At 1 C rate, Li-S cells with elastomer-protected pretreated anodes (LPE) suppressed Li dendrite growth and achieved 3-4 times higher specific capacity after 100 cycles.

Conclusions:

  • Controlled electrochemical pretreatment is critical for forming a continuous, uniform SEI with good Li-ion transport.
  • Optimized SEI formation significantly enhances Li-S battery performance and addresses anode degradation issues.
  • The study demonstrates a viable strategy for improving the practical application of Li-S batteries.