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Related Concept Videos

Ion Exchange01:17

Ion Exchange

591
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...
591

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Multipolar Conjugated Polymer Framework Derived Ionic Sieves via Electronic Modulation for Long-Life All-Solid-State

Xue Yang1, Long Fang1, Jing Li2

  • 1Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Key Laboratory of High Performance Polymer-based Composites of Guangdong Province, GBRCE for Functional Molecular Engineering, School of Chemistry, Sun Yat-sen University, Guangzhou, 510006, China.

Angewandte Chemie (International Ed. in English)
|March 25, 2024
PubMed
Summary

Researchers developed a novel cyano-vinylene-linked multipolar polymer framework (CNF-COF) to enhance lithium-ion conduction in solid polymer electrolytes. This material improves lithium metal battery performance by enabling faster ion transport and stable lithium anodes for longer lifespans.

Keywords:
All-solid-state Li metal batteriesCOFsLi ion conductionelectronic regulationpolymer electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Solid polymer electrolytes (SPEs) are crucial for developing safer all-solid-state (ASS) lithium metal batteries.
  • Improving lithium-ion (Li+) conductivity and anode stability in SPEs remains a significant challenge.
  • Electronic structure engineering offers a promising pathway to tune polymer properties for enhanced battery performance.

Purpose of the Study:

  • To investigate the role of electronic structure engineering in improving Li+ conduction using a tunable multipolar conjugated polymer framework.
  • To develop a novel polymer framework capable of enhancing Li+ migration and stabilizing lithium anodes.
  • To optimize solid polymer electrolytes for high-rate, long-lifespan ASS Li metal batteries.

Main Methods:

  • Theoretical studies were employed to guide the design of the polymer framework.
  • A cyano-vinylene-linked multipolar polymer framework (CNF-COF) was synthesized.
  • CNF-COF was incorporated into poly(ethylene oxide) (PEO) electrolytes to create composite electrolytes.
  • Electrochemical performance, including ionic conductivity, Li+ transference number, and cycling stability, was evaluated.

Main Results:

  • The CNF-COF material demonstrated efficient ion sieving properties, modifying the PEO electrolyte.
  • Dual decoration of cyano and fluorine groups in CNF-COF regulated electronic structure, enhancing oxidative stability and facilitating ion-pair dissociation.
  • The PEO composite electrolyte with 0.5 wt% CNF-COF exhibited high ionic conductivity (0.634 mS cm-1 at 60°C) and a high Li+ transference number (0.81).
  • Li symmetric cells showed stable Li plating/stripping for over 1400 hours.
  • ASS Li metal batteries with LiFePO4 cathodes demonstrated stable cycling over 2000 cycles at 1C and 1000 cycles at 2C with ~75% capacity retention.

Conclusions:

  • The developed CNF-COF is an effective additive for enhancing Li+ conduction and stability in PEO-based solid polymer electrolytes.
  • The CNF-COF modified electrolytes enable fast, selective Li+ transport and suppress Li dendrite growth.
  • The superior performance of the composite electrolyte paves the way for high-performance, long-lifespan ASS Li metal batteries.