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Related Experiment Video

Updated: May 23, 2025

Non-aqueous Electrode Processing and Construction of Lithium-ion Coin Cells
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Green Electrode Processing Enabled by Fluoro-Free Multifunctional Binders for Lithium-Ion Batteries.

Xiuyu Jin1, Ziting Zhu1, Qiusu Miao1

  • 1The Energy Storage and Distributed Resources Division (ESDR), Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 7, 2025
PubMed
Summary

Researchers developed a new method for creating conductive polymer binders for lithium-ion batteries using aqueous processing. This technique enhances conductivity and enables stable battery performance without additives.

Keywords:
conductive binderconjugated polymergreen processinghierarchically ordered structurelithium‐ion battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Eco-friendly processing of conjugated polymer binders for lithium-ion batteries requires improved solubility, often at the cost of conductivity.
  • Polyfluorene-based polymers offer potential but face challenges in balancing solubility and conductivity.

Purpose of the Study:

  • To develop a novel approach for aqueous solution processing of conjugated polymer binders that overcomes the trade-off between solubility and conductivity.
  • To create hierarchically ordered structures (HOS) from a polyfluorene-based binder (PFO) for enhanced electrochemical performance.

Main Methods:

  • Utilized poly(2,7-9,9 (di(oxy-2,5,8-trioxadecane))fluorene) (PFO), soluble in water-ethanol mixtures.
  • Integrated aqueous solution processing with controlled thermal-induced cleavage of solubilizing side chains to form HOS-PFO.
  • Fabricated SiOx anodes using HOS-PFO as a binder, demonstrating in situ side chain decomposition.

Main Results:

  • Achieved a 6-7 orders of magnitude enhancement in electronic conductivity of the polyfluorene binder through HOS formation.
  • Demonstrated stable cycling and high-capacity retention (3.0 mAh cm⁻²) for SiOx anodes without conducting carbon or fluorinated electrolyte additives.
  • HOS-PFO facilitated improved intermolecular π-π stacking, enhancing electrochemical performance.

Conclusions:

  • The developed technique offers a universal approach for fabricating electrodes with conjugated polymer binders from aqueous solutions without compromising conductivity.
  • Hierarchically ordered structures (HOS) from PFO binders significantly improve electronic conductivity and electrochemical performance in lithium-ion batteries.
  • This method enables the use of advanced materials like SiOx anodes with high stability and capacity.