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Multifunctional Subnanowires Modulating In Situ Polymerization for High-Voltage Solid-State Batteries.

Haoran Xu1, Hong Zhang1, Wei Peng1

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.

ACS Applied Materials & Interfaces
|May 30, 2025
PubMed
Summary
This summary is machine-generated.

Subnanowires enhance poly(1,3-dioxolane) (PDOL) electrolytes for lithium metal batteries (LMBs). This strategy improves oxidative stability, enabling high-voltage applications and better battery performance.

Keywords:
high-voltagein situ ring-opening polymerizationmolecular weight modulationsolid-state lithium batteriessubnanowires

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • In situ polymerized poly(1,3-dioxolane) (PDOL) electrolytes offer good interfacial contact but suffer from limited oxidative stability, restricting their use with high-voltage cathodes in lithium metal batteries (LMBs).
  • Developing electrolytes with enhanced oxidative stability is crucial for advancing high-performance LMBs.

Purpose of the Study:

  • To improve the oxidative stability of in situ polymerized PDOL electrolytes by modulating their molecular weight distribution (MWD).
  • To introduce a novel strategy using multifunctional subnanowires (SNWs) to control PDOL polymerization and enhance electrolyte performance.

Main Methods:

  • Utilized multifunctional subnanowires (SNWs) to promote and regulate the ring-opening polymerization of 1,3-dioxolane (DOL).
  • Leveraged oxygen vacancies (Ov) and protonated oleylamine (PO) on SNWs to enhance monomer conversion, control polymerization speed, and facilitate lithium salt dissociation.
  • Characterized the resulting PDOL electrolytes for their MWD, oxidative stability, and ionic conductivity.

Main Results:

  • Achieved a narrow MWD of 1.42 in PDOL electrolytes through the SNW-induced polymerization strategy.
  • Demonstrated superior oxidative stability exceeding 5.1 V for the modified PDOL electrolytes.
  • Obtained a high lithium-ion transference number of 0.81, indicating efficient ion transport.
  • NCM811||Li cells using these electrolytes maintained stable operation for 100 cycles at 4.5 V with 89.2% capacity retention.

Conclusions:

  • The molecular weight modulation strategy using SNWs effectively enhances the oxidative stability of in situ polymerized PDOL electrolytes.
  • This approach provides a unique pathway for developing advanced electrolytes for high-voltage lithium metal batteries.
  • The findings offer significant potential for the next generation of high-performance and stable energy storage devices.