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Constructing Ionic Transport Network via Supramolecular Composite Binder in Cathode for All-Solid-State Lithium

Haixing Liu1, Suqing Wang1, Wenhan Kong1

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Summary

A new composite binder (PPCL) enhances all-solid-state lithium batteries (ASSLBs) by creating efficient ion transport channels. This binder improves electrode stability and achieves excellent cycling performance for advanced ASSLBs.

Keywords:
All‐solid‐stateBinderLi+ transport channelsLithium batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Binders are crucial for electrode integrity in batteries.
  • Conventional binders like polyvinylidene fluoride have low ionic conductivity, limiting performance in all-solid-state lithium batteries (ASSLBs).

Purpose of the Study:

  • To design a novel composite binder (PPCL) for ASSLBs with improved ionic conductivity and structural stability.
  • To investigate the synergistic effects of supramolecular structure and linear polymer cross-linking on ion transport.

Main Methods:

  • Synthesized a composite binder (PPCL) using cross-linked linear molecules and mechanically interlocked molecules with supramolecular channels.
  • Incorporated β-cyclodextrin rings and polyethylene oxide chains via hydrogen bonding to create the supramolecular structure.
  • Fabricated LiFePO₄-based cathodes using the PPCL binder for ASSLB testing.

Main Results:

  • The PPCL binder exhibits exceptional adhesive strength, ensuring robust electrode structural stability.
  • The supramolecular channel structure facilitates multiple and synergistic Li⁺ transport pathways within the cathode.
  • ASSLBs utilizing the PPCL binder demonstrated excellent rate capability and long-term cycling stability (>1000 cycles at 1 C).
  • A pouch ASSLB showed sustained cycling stability for over 250 cycles at 0.2 C.

Conclusions:

  • The designed PPCL binder effectively addresses the ionic transport limitations of conventional binders in ASSLBs.
  • This composite binder enhances both structural integrity and ionic conductivity, leading to superior battery performance.
  • The findings provide valuable insights for developing high-loading cathodes for next-generation ASSLBs.