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Reinforced Quaternized Poly(crown ether)-Based Solid Polymer Electrolyte for Highly Durable Lithium-Metal Batteries.

Fangming Bai1,2, Sisi Zhang1, Yiting Zhou1,2

  • 1College of Chemical Engineering and Materials Science, State Key Laboratory of Bio-based Fiber Materials, Key Laboratory of Marine Resource Chemistry and Food Technology (TUST) in the Ministry of Education, Tianjin University of Science & Technology, Tianjin 300457, China.

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Researchers developed a reinforced composite solid polymer electrolyte (QPCE-SPE) for safer, high-performance all-solid-state lithium metal batteries (LMBs). This novel electrolyte enhances ionic conductivity and stability, overcoming key challenges in next-generation energy storage.

Keywords:
DFT simulationsLi dendrite suppressionQuaternized poly(crown ether)lithium−metal batteryreinforced solid polymer electrolytes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • All-solid-state lithium metal batteries (LMBs) offer high energy density and safety.
  • Solid polymer electrolytes (SPEs) in LMBs suffer from low ionic conductivity and poor Li+ transference, causing dendrite growth and interfacial issues.

Purpose of the Study:

  • To develop a mechanically reinforced composite solid polymer electrolyte (QPCE-SPE) for improved LMB performance.
  • To address challenges of low ionic conductivity and Li+ transference in conventional SPEs.

Main Methods:

  • Fabrication of QPCE-SPE by impregnating a PEO/LiTFSI matrix with quaternized poly(crown ether) into a porous polypropylene substrate.
  • Characterization of ionic conductivity, Li+ transference number, and electrochemical performance in Li symmetric and LiFePO4 (LFP)//Li cells.

Main Results:

  • QPCE-SPE achieved an ionic conductivity of 1.05 × 10^-4 S cm^-1 at 80 °C and a Li+ transference number of 0.56.
  • Stable cycling (>1300 h) in Li symmetric cells and excellent capacity retention (81.9% after 1000 cycles) in Li|QPCE-SPE|LFP batteries.
  • Demonstrated mechanical resilience and intrinsic safety under abuse conditions.

Conclusions:

  • The developed QPCE-SPE effectively enhances ionic conductivity and Li+ transport in solid polymer electrolytes.
  • This composite electrolyte presents a viable strategy for high-performance and safe all-solid-state lithium metal batteries.
  • The mechanical reinforcement and chemical design contribute to overcoming critical limitations in current SPE technology.