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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Polymer-nanocomposite brush-like architectures as an all-solid electrolyte matrix.

Soujanya Gowneni1, Kota Ramanjaneyulu, Pratyay Basak

  • 1Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, Council of Scientific & Industrial Research - Indian Institute of Chemical Technology (CSIR-IICT), CSIR - Network Institutes for Solar Energy (CSIR-NISE), Academy of Scientific and Innovative Research (AcSIR) , Hyderabad-500 007, Andhra Pradesh, India.

ACS Nano
|November 8, 2014
PubMed
Summary

We developed novel polymer-nanocomposites with brush-like architectures for solid-state lithium-ion conduction. These materials show promise as all-solid electrolyte matrices, with ionic conductivity up to 10(-4) S cm(-1).

Keywords:
ionic conductivitynanostructuresorganic−inorganic hybridspolymer brushessurface functionalization

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Developing solid-state electrolytes is crucial for safer and more efficient lithium-ion batteries.
  • Existing polymer electrolytes often face challenges with ionic conductivity and mechanical stability.
  • Nanostructured materials offer unique properties for enhancing electrolyte performance.

Purpose of the Study:

  • To investigate polymer-nanocomposites with brush-like architectures as all-solid electrolyte matrices for Li(+)-ion conduction.
  • To evaluate the impact of core morphology, surface modifiers, grafting length, and brush density on electrochemical properties.
  • To establish a physical model for ion transport in these nanostructured organic-inorganic hybrids.

Main Methods:

  • Synthesis of nanostructured titania with controlled morphologies (nanoparticles, nanorods, nanotubes) via wet-chemical methods.
  • Covalent functionalization of titania using dopamine, gallic acid, and glycerol.
  • Grafting of polyethylene glycol monomethyl ethers onto titania using isocyanate chemistry.
  • Characterization using XRD, TEM, FTIR, TG-DTA, DSC, and electrochemical impedance spectroscopy (EIS).

Main Results:

  • Well-defined titania nanostructures with various morphologies and phases were successfully synthesized.
  • Brush-like polymer-nanocomposites were fabricated with controlled grafting parameters.
  • Electrochemical impedance spectroscopy revealed insights into ion transport mechanisms.
  • Preliminary ionic conductivity measurements ranged from approximately 10(-4) to 10(-5) S cm(-1).

Conclusions:

  • Polymer-nanocomposites with brush-like architectures are feasible matrices for all-solid Li(+)-ion electrolytes.
  • The study provides a foundational understanding of structure-property relationships in these materials.
  • Further optimization holds significant potential for improving ionic conductivity for battery applications.