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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Functionally Modified Polymer Electrolyte Based on Noncovalent Interaction for Stable Lithium Metal Batteries.

Weiteng Lin1,2, Yating Zhang1,2, Yanan Zhang1,2

  • 1Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin 300350, P. R. China.

ACS Applied Materials & Interfaces
|May 20, 2024
PubMed
Summary

This study developed a functionalized polymer electrolyte that enhances lithium-ion transport by limiting anion movement. This breakthrough improves lithium metal battery performance and cycle life.

Keywords:
4-(trifluoromethyl)styreneLi+ transference numberin situ copolymerizationnoncovalent interactionsolid-state 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).
  • Low lithium-ion transference numbers (tLi) in SPEs cause anion aggregation and concentration polarization, hindering battery performance.
  • Existing SPEs suffer from strong Li+ coupling with polymer chains, limiting effective ion transport.

Purpose of the Study:

  • To develop a functionalized modified polymer electrolyte (FMPE) with selective cation transport.
  • To enhance the lithium-ion transference number (tLi) by limiting anion mobility.
  • To improve the electrochemical performance of lithium metal batteries.

Main Methods:

  • Synthesized FMPE by embedding 4-(trifluoromethyl)styrene (TFS) functional groups onto a poly(diethylene glycol diacrylate) polymer chain.
  • Investigated noncovalent interactions (hydrogen bonding, dipole-dipole) between TFS groups and TFSI- anions.
  • Employed Density Functional Theory (DFT) calculations to analyze anion migration barriers and Li+ decoupling.

Main Results:

  • Achieved elevated tLi values of 0.595 at 25 °C and 0.699 at 60 °C.
  • DFT calculations confirmed increased anion migration barriers due to noncovalent interactions and electron delocalization.
  • FMPEs demonstrated excellent rate capability (88.8 mAh g-1 at 5 C) and long-term cycling stability (0.064% decay per cycle over 500 cycles).

Conclusions:

  • The functionalized polymer electrolyte effectively suppresses anion aggregation and promotes Li+ transport.
  • The developed FMPE significantly enhances the performance and stability of lithium metal batteries.
  • This strategy offers a promising pathway for advanced solid-state battery electrolytes.