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Regulation of Sodium and Potassium01:26

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Interface Regulation in Sodium-Ion Batteries Using a Magnesium Fluoride-Modified Polyimide Composite Separator.

Xinyu Li1, Longkai Zhang1, Wenjuan Qiu1

  • 1School of Chemistry, South China Normal University, Guangzhou 510006, People's Republic of China.

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Summary

A new nano-MgF2 coating enhances polyimide separators for sodium-ion batteries (SIBs). This modification improves electrolyte interaction and sodium-ion transport, boosting battery performance and stability.

Keywords:
MgF2 inorganic layerin situ precipitationinterphasepolyimide separatorsodium-ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • The separator is crucial for sodium-ion battery (SIB) performance, impacting interfacial stability and ion transport.
  • Developing advanced separators is key to unlocking the potential of SIBs.

Purpose of the Study:

  • To engineer a high-performance polyimide-based separator for SIBs.
  • To enhance interfacial properties and sodium-ion flux using a nano-MgF2 coating.

Main Methods:

  • A facile alkaline activation and in situ precipitation method was used to coat polyimide separators with nano-MgF2.
  • The modified separators were characterized for their properties and performance in SIB half-cells.

Main Results:

  • The MgF2 layer exhibited strong polarity and a negative surface charge, improving electrolyte affinity and regulating ion flux.
  • Modified separators facilitated rapid Na+ migration and promoted a stable solid electrolyte interphase (SEI) formation.
  • Na||hard carbon cells with modified separators showed a discharge capacity of 160 mAh g-1 (vs. 82.1 mAh g-1 without modification).
  • Na||NFPP cells demonstrated excellent cycling stability, retaining 90.9 mAh g-1 after 500 cycles.

Conclusions:

  • Interface engineering of separators with nano-MgF2 is a promising strategy for high-performance SIBs.
  • The modified separators significantly improve interfacial kinetics, ion transport, and cycling stability in SIBs.