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Related Concept Videos

Ion Exchange01:17

Ion Exchange

560
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
560

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Polysilaketals: High-Performance Polyether-Based Electrolytes with Tunable Disubstituted Silane Linkers.

Haley J Rugh1, Jaeyong Lee2,3, Chenyue Sun1

  • 1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, 14853-1301, USA.

Angewandte Chemie (International Ed. in English)
|October 16, 2024
PubMed
Summary

New silicon-containing polymer electrolytes synthesized via anionic ring-opening polymerization offer higher conductivity and stability for advanced lithium-ion batteries, surpassing traditional poly(ethylene oxide) benchmarks.

Keywords:
amorphous materialslithium-ion batteriespolymer electrolytering-opening polymerizationsilicon

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Polymer electrolytes offer enhanced safety and energy density for lithium-ion batteries compared to liquid electrolytes.
  • Current polymer electrolytes are limited by suboptimal electrochemical performance, hindering widespread adoption.

Purpose of the Study:

  • To develop novel amorphous silicon-containing polyether-based polymer electrolytes with improved electrochemical properties.
  • To investigate the effect of substituent bulk on the performance of these new electrolytes.

Main Methods:

  • Anionic ring-opening polymerization (AROP) of cyclic silaketals to synthesize polysilaketals.
  • Synthesis of polymers with varying substituent bulk (R=alkyl, phenyl) and targeted molecular weights.
  • Electrochemical characterization, including conductivity and current fraction measurements.

Main Results:

  • Polysilaketals with controlled molecular weights were successfully synthesized, exceeding the entanglement threshold.
  • The polysilaketal P(OSiMe,Me-2EO) demonstrated conductivity superior to poly(ethylene oxide) (PEO).
  • Bulkier polysilaketals, P(OSiEt,Et-2EO) and P(OSiMe,Ph-2EO), showed enhanced stability and higher current fractions than PEO.

Conclusions:

  • The developed polysilaketals represent a significant advancement in solid polymer electrolyte technology.
  • Systematic incorporation of silyl groups is a viable strategy for creating high-performance polymer electrolytes.
  • These novel materials hold promise for next-generation lithium-ion batteries.