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Plasma-engineered FeSe2-encapsulated carbon composites with enhanced kinetics for high-performance lithium and sodium ion batteries

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2024, 34(9), pp.2421~2433
  • DOI : 10.1007/s42823-024-00771-9
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : May 19, 2024
  • Accepted : June 26, 2024
  • Published : December 5, 2024

Luo Junmei 1 Bo Shufeng 1 Park Seohyun 1 박범경 1 Li Oi Lun Helena 1

1부산대학교

Accredited

ABSTRACT

Iron selenides with high capacity and excellent chemical properties have been considered as outstanding anodes for alkali metal-ion batteries. However, its further development is hindered by sluggish kinetics and fading capacity caused by volume expansion. Herein, a series of FeSe2 nanoparticles (NPs)-encapsulated carbon composites were successfully synthesized by tailoring the amount of Fe species through facile plasma engineering and followed by a simple selenization transformation process. Such a stable structure can effectively mitigate volume changes and accelerate kinetics, leading to excellent electrochemical performance. The optimized electrode (FeSe2@C2) exhibits outstanding reversible capacity of 853.1 mAh g−1 after 150 cycles and exceptional rate capacity of 444.9 mAh g−1 at 5.0 A g−1 for Li+ storage. In Na+ batteries, it possesses a relatively high capacity of 433.7 mAh g−1 at 0.1 A g−1 as well as good cycle stability. The plasma-engineered FeSe2@C2 composite, which profits from synergistic effect of small FeSe2 NPs and carbon framework with large specific surface area, exhibits remarkable ions/electrons transportation abilities during various kinetic analyses and unveils the energy storage mechanism dominated by surface-mediated capacitive behavior. This novel cost-efficient synthesis strategy might offer valuable guidance for developing transition metal-based composites towards energy storage materials.

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