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Related Experiment Video

Updated: Aug 23, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Polyurethane-P2S5 composite-based solid-state electrolyte assists low polarization and high stability all-solid-state

Peng Cui1, Chun Sun1, Hanqing Dai2

  • 1College of Electronic and Optical Engineering, Nanjing University of Posts &Telecommunications 9 Wenyuan Road Nanjing 210023 Jiangsu China weiwei@njupt.edu.cn.

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|November 2, 2022
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Summary

This study enhances polyurethane (PU) solid polymer electrolytes (SPEs) for lithium-metal batteries by modifying soft segments, significantly reducing polarization and improving cycle stability for high-performance energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Polyurethane (PU) block copolymers are promising solid electrolytes for lithium-metal batteries due to mechanical strength.
  • Hard segments in PU limit ion transport, causing polarization, poor cycle stability, and capacity fade.

Purpose of the Study:

  • To develop a novel composite polymer solid electrolyte (SPE) with improved chemical stability and electrolyte-electrode interaction.
  • To suppress polarization phenomena and enhance cycle performance in lithium-metal batteries.

Main Methods:

  • Modulating soft segments in block copolymer PU.
  • Synthesizing a new SPE via ion-conduct segment modification using P2S5.
  • Characterizing ion conductivity and electrochemical performance of the SPE in LiFePO4 (LFP)|SPE|Li batteries and lithium symmetric cells.

Main Results:

  • Achieved ion conductivity of 7.4 × 10⁻⁴ S cm⁻¹ at 25 °C and 4.3 × 10⁻³ S cm⁻¹ at 80 °C.
  • Demonstrated high specific capacity and stable charge/discharge platforms in LFP|SPE|Li cells.
  • Obtained 90% capacity retention after 2000 cycles at 5C and over 750 hours of stable cycling in lithium symmetric cells with negligible polarization.

Conclusions:

  • Modulating soft segments in PU block copolymers is an effective strategy to suppress polarization.
  • The developed P2S5-modified SPE offers long cycle stability and high capacity retention for advanced lithium-metal batteries.