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Updated: Mar 28, 2026

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Constructing Charge Transfer Pathways via π-Conjugation Modulation for Long-Cycling Mg-S Batteries.

Xian Zhou1, Tian Xu1, Hongyu Zhang1

  • 1College of Smart Materials and Future Energy, Fudan University, Shanghai 200433, China.

ACS Nano
|March 26, 2026
PubMed
Summary

Cuprous tetrahydroxyquinone (Cu-THQ) accelerates polysulfide conversion in magnesium-sulfur (Mg-S) batteries. This advancement enables long-life Mg-S batteries with enhanced capacity and stable performance, even at low temperatures.

Keywords:
catalytic interlayerconductive conjugated coordination polymersconjugation effectelectronic modulationmagnesium−sulfur batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Rechargeable magnesium-sulfur (Mg-S) batteries offer safe, abundant energy storage.
  • Sluggish polysulfide conversion limits Mg-S battery performance, hindering practical application.

Purpose of the Study:

  • To develop an electrocatalyst to accelerate polysulfide conversion in Mg-S batteries.
  • To enhance the charge transfer and MgS2 reduction kinetics for improved battery performance.

Main Methods:

  • Utilized cuprous tetrahydroxyquinone (Cu-THQ) as an electrocatalyst on a polypropylene interlayer.
  • Investigated electronic modulation via restricted π-delocalization and enhanced electron donation to Cu centers.
  • Analyzed charge-transfer pathways and Cu-S orbital hybridization.

Main Results:

  • Cu-THQ interlayer facilitated robust anchoring and accelerated reduction of MgS2 intermediates.
  • Mg-S batteries achieved a high reversible capacity of 470 mAh g⁻¹ after 2000 cycles at 8.36 A g⁻¹.
  • Stable cycling performance was demonstrated at -20 °C.

Conclusions:

  • A π-conjugation-driven approach effectively accelerates polysulfide conversion in Mg-S batteries.
  • The Cu-THQ interlayer promotes the development of long-life, high-performance Mg-S batteries.
  • This strategy holds promise for advancing next-generation energy storage systems.