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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solvent-Enriched Separator-Electrolyte Interface Stabilizes 4.7 V Ni-Rich Layered Cathodes.

Deqin Zeng1, Jinze Wang2,3, Long Chen2,3

  • 1Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China.

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|May 14, 2026
PubMed
Summary
This summary is machine-generated.

A new separator-adsorbed solvent strategy enhances lithium metal batteries (LMBs) by preventing solvent decomposition at high voltages. This approach uses polytetrafluoroethylene (PTFE) separators to protect the cathode interface, enabling longer battery life.

Keywords:
adsorption sitelithium metal batterypolytetrafluoroethyleneseparator−electrolyte interfaceultrahigh-voltage

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • High charging cutoff voltages are crucial for lithium metal batteries (LMBs).
  • Parasitic solvent reactions at the electrode/electrolyte interface hinder performance and stability.
  • Existing interface engineering methods struggle to prevent solvent decomposition near cathodic sites.

Purpose of the Study:

  • To develop a novel strategy to suppress solvent decomposition in LMBs operating at high voltages.
  • To enhance the stability of the cathode interface by controlling solvent behavior.
  • To enable the practical application of ultrahigh-voltage LMBs.

Main Methods:

  • Proposed a separator-adsorbed solvent strategy using a polytetrafluoroethylene (PTFE) separator.
  • Investigated interactions between PTFE separator and carbonate solvents (C-H···F bonds, n→π* interactions).
  • Fabricated gel polymer electrolyte with PTFE separator (GPE-PTFE) for Li||LiNi0.8Co0.1Mn0.1O2 cells.

Main Results:

  • PTFE separator created adsorption sites, effectively competing with the cathode for solvent molecules.
  • Suppressed solvent decomposition and stabilized the cathode interface.
  • GPE-PTFE cells achieved 80% capacity retention over 671 cycles at 4.4 V, nearly doubling performance with PE separators.
  • Achieved 90% capacity retention after 100 cycles at an ultrahigh 4.7 V cutoff.

Conclusions:

  • The separator-adsorbed solvent strategy is effective in suppressing solvent decomposition and stabilizing the cathode interface in LMBs.
  • PTFE separators show significant potential for enabling ultrahigh-voltage operation in lithium metal batteries.
  • This work presents a new paradigm for designing advanced separators for high-performance energy storage devices.