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

• 作 者: MA Cui QIU Licheng BAO Jian ZHOU Yongning
• 机 构: Department of Materials Science,Fudan University,Shanghai 200433,P.R.China
• 出 处: 高等学校化学研究（英文版）
• 发表日期: 2021年2期
• 关键词: Sodium-ion battery Metal selenide Anode Sodium storage

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 synthe-sized via a facile one-step hydrothermal method.They deliver a re-versible capacity of 480.7 mA·h/g at 500 mA/g and a high initial Cou-lombic 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 dis-charge 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 electro-chemical performance and enables FeNi2Se4@C nanoflakes promi-sing anode materials for SIBs.