Jump to main content
Jump to site search

Issue 47, 2018
Previous Article Next Article

Nano-embedded microstructured FeS2@C as a high capacity and cycling-stable Na-storage anode in an optimized ether-based electrolyte

Author affiliations

Abstract

Pyrite (FeS2) is considered an attractive Na-storage anode owing to its abundance, environment friendliness and high theoretical capacity (894 mA h g−1). However, it still remains great challenges to realize an applicable FeS2 electrode with both high reversible capacity and long cycle life. In this study, micron-sized FeS2@C composed of FeS2 nanoparticles uniformly embedded in carbon matrix was investigated as a conversion-type anode for sodium ion batteries by coupling with various electrolytes. It is demonstrated that the electrolyte formulations, i.e., both solvents and Na salts, play vital roles in the Na storage performance of FeS2. The combination of NaPF6 and DME was highly advantageous for constructing robust SEI films with high Na+ conductivity, guaranteeing fast and reversible conversion reactions in the wide electrochemical window of 0.005–3 V (vs. Na/Na+). Owing to the fast charge transfer kinetics and high chemical compatibility between the electrolyte and electrode, the as-prepared FeS2@C could deliver a high reversible capacity of 853 mA h g−1 at 0.2 A g−1 and 459 mA h g−1 at 40 A g−1, a remarkable initial coulombic efficiency of 84.7% and excellent cycling stability with capacity retention of 83.2% over 1000 cycles. These parameters prove the great potential of FeS2@C in fulfiling commercial demands for wide range of energy storage applications.

Graphical abstract: Nano-embedded microstructured FeS2@C as a high capacity and cycling-stable Na-storage anode in an optimized ether-based electrolyte

Back to tab navigation

Supplementary files

Publication details

The article was received on 04 Aug 2018, accepted on 07 Nov 2018 and first published on 13 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA07571A
Citation: J. Mater. Chem. A, 2018,6, 24425-24432

  •   Request permissions

    Nano-embedded microstructured FeS2@C as a high capacity and cycling-stable Na-storage anode in an optimized ether-based electrolyte

    M. Zhou, H. Tao, K. Wang, S. Cheng and K. Jiang, J. Mater. Chem. A, 2018, 6, 24425
    DOI: 10.1039/C8TA07571A

Search articles by author

Spotlight

Advertisements