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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Dynamic Anode/Cathode-Electrolyte Interface Induced through Polymer Evolution for Durable Lithium Metal Batteries.

Wanru Lin1, Kang Zhou1, Chao Yang1

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A novel artificial interface (MAF) stabilizes lithium metal batteries by simultaneously preventing lithium dendrite growth and cathode particle distortion. This copolymer interface enhances cycling stability for both Li||Li symmetric and Li||LFP/NCM811 cells.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Solid-electrolyte interface (SEI) engineering is crucial for lithium metal battery (LMB) cyclability.
  • Simultaneous stabilization of the Li anode and cathode is needed to overcome performance limitations.

Purpose of the Study:

  • To develop a bifunctional artificial interface for LMBs that addresses both Li dendrite growth and cathode particle distortion.
  • To investigate the dynamic evolution and contributions of the interface during battery cycling.

Main Methods:

  • Copolymerization of maleic anhydride (MA) and hexafluorobutyl acrylate (HFA) to create the MAF interface on the Li anode.
  • Electrochemical testing of Li||Li symmetric cells, Li||LiFePO4 (LFP) cells, and Li||LiNi0.8Co0.1Mn0.1O2 (NCM811) cells.

Main Results:

  • The MAF layer forms a hybrid SEI with an inorganic interior and polymer exterior, promoting uniform Li+ plating.
  • Fluorinated oligomers in the MAF dynamically mature the LiF-rich cathode-electrolyte interface (CEI).
  • Li||Li symmetric cells cycled over 900 hours; Li||LFP and Li||NCM811 cells showed 90.2% and 80.6% capacity retention after 1500 and 350 cycles, respectively.

Conclusions:

  • The MAF interface effectively suppresses Li dendrite growth and cathode degradation in LMBs.
  • Dynamic interface evolution is key to enhancing long-term cycling stability and performance in high-energy LMBs.