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A Transformative Molecular Muscle Solid Electrolyte.

Yuhang Liu1, Zhangqin Shi1,2, Xinyang Yue1,2

  • 1Frontiers Science Center for Transformative Molecules, State Key Laboratory of Synergistic Chem-Bio Synthesis, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

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Researchers developed a molecular muscle solid polymer electrolyte (SPE) inspired by muscle function. This breakthrough enhances ionic conductivity and mechanical strength for safer, longer-lasting lithium metal batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Solid polymer electrolytes (SPEs) are crucial for lithium metal batteries (LMBs) but face challenges balancing mechanical strength and ionic conductivity.
  • The
  • seesaw effect
  • ]
  • The
  • seesaw effect
  • limits the practical application of SPEs in LMBs.

Purpose of the Study:

  • To design a novel SPE that overcomes the limitations of traditional materials.
  • To enhance both ionic conductivity and mechanical robustness in SPEs for advanced LMBs.
  • To investigate a new class of SPEs inspired by biological muscle structures.

Main Methods:

  • Fabrication of mechanically interlocked [c2]daisy chain ([c2]DC) networks (DC-MINs) as SPEs.
  • Characterization of ionic conductivity, mechanical properties, and electrochemical performance.
  • Testing of Li symmetric cells and all-solid-state pouch LMBs.

Main Results:

  • Achieved a room-temperature ionic conductivity of 1.04 mS cm-1 without plasticizers.
  • Demonstrated superior mechanical properties and enhanced Li-ion transport via dynamic [c2]DC units and host-guest interactions.
  • Extended lifespan of Li symmetric cells to over 5000 hours by restricting dendrite growth.
  • Achieved 87.8% capacity retention after 750 cycles in a 1 Ah LiFePO4 pouch cell.

Conclusions:

  • The molecular muscle SPE design effectively breaks the bottleneck in SPE development for LMBs.
  • The dynamic nature of [c2]DC networks offers a promising strategy for high-performance solid-state batteries.
  • This work provides a new avenue for designing robust and conductive SPEs for next-generation energy storage.