Abstract
Developing effective anode materials for sodium-ion batteries (SIBs) remains challenging. Although FeS2 has a high theoretical capacity, it suffers from significant volume changes during charge/discharge and forms soluble polysulfides at lower potentials (below 0.8 V vs. Na/Na+), making practical application difficult. We have developed an effective strategy to synthesize N-doped carbon-coated FeS2 nanorattles encapsulated in N/S dual-doped graphene/single-walled carbon nanotubes (G/SWCNTs) via hydrothermal vulcanization (FSCGS). This approach enabled the simultaneous formation of nanorattle structures and N/S dual-element doping into the G/SWCNT network. Using the FSCGS sample as an anode for SIBs, a remarkable specific capacity of 1,190 mAh g−1 at a current density of 0.1 A g−1 was achieved, with an excellent rate capability of 476 mAh g−1 at 10.0 A g−1. Moreover, it exhibited superior cyclic stability, with a capacity retention of 91.3% at 0.5 A g−1 after 200 cycles. First-principles calculations revealed that pyridinic-N/S doping of the basal graphene network improved Na+ reduction, resulting in enhanced electrochemical performance. The effective electrochemical functioning of the FSCGS anode material was attributed to an optimized hierarchical architecture and the excellent electrical conductivity/electrochemical activity provided by the dual carbon entities (N-doped carbon and N/S dual-doped G/SWCNT network).
Original language | English |
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Article number | 135678 |
Journal | Chemical Engineering Journal |
Volume | 439 |
DOIs | |
Publication status | Published - 2022 Jul 1 |
Bibliographical note
Funding Information:This work was mainly supported by Brain Pool Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science and ICT (Grant no.2019H1D3A1A01070498). In addition, we also gratefully acknowledge financial support from the Korea Institute of Science and Technology (KIST) institutional and KU-KIST programs (Project No. 2E31811) and the National Research Foundation of Korea (NRF) grant funded by the Korea government (No. 2022R1A2B5B02001597 and 2018M1A2A2061994).
Publisher Copyright:
© 2022 The Authors
Keywords
- Anode material
- Energy storage
- Graphene/CNT
- Iron sulfide (FeS)
- Sodium-ion batteries
- Specific capacity
ASJC Scopus subject areas
- Chemistry(all)
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering