Chemical Research in Chinese Universities ›› 2021, Vol. 37 ›› Issue (2): 318-322.doi: 10.1007/s40242-021-1030-9

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Hexagonal FeNi2Se4@C Nanoflakes as High Performance Anode Materials for Sodium-ion Batteries

MA Cui, QIU Licheng, BAO Jian, ZHOU Yongning   

  1. Department of Materials Science, Fudan University, Shanghai 200433, P. R. China
  • Received:2021-01-20 Online:2021-04-01 Published:2021-03-17
  • Contact: ZHOU Yongning E-mail:ynzhou@fudan.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(No.52071085) and the Science and Technology Commission of Shanghai Municipality, China(No.19ZR1404200).

Abstract: Metal selenides have drawn significant attention as pro-mising anode materials for sodium-ion batteries(SIBs) owing to their high electronic conductivity and reversible capacity. Herein, hexagonal FeNi2Se4@C nanoflakes were synthesized via a facile one-step hydrothermal method. They deliver a reversible capacity of 480.7 mA·h/g at 500 mA/g and a high initial Coulombic efficiency of 87.8%. Furthermore, a discharge capacity of 444.8 mA·h/g can be achieved at 1000 mA/g after 180 cycles. The sodium storage mechanism of FeNi2Se4@C is uncovered. In the discharge process, Fe and Ni nanoparticles are generated and distri-buted in Na2Se matrix homogeneously. In the charge process, FeNi2Se4 phase is formed reversibly. The reversible phase conversion of FeNi2Se4@C during cycling is responsible for the excellent electrochemical performance and enables FeNi2Se4@C nanoflakes promi-sing anode materials for SIBs.

Key words: Sodium-ion battery, Metal selenide, Anode, Sodium storage