High capacity and low cost spinel Fe 3 O 4 for the Na-ion battery negative electrode materials

• DOI: 10.1016/j.electacta.2014.09.081
• Publication Date: 2014-09-21T21:45:50Z
• Authors: P. Ramesh Kumar; Young Hwa Jung; K. Kamala Bharathi; Chek Hai Lim; Do Kyung Kim
• Keywords: HIGH-PERFORMANCE ANODE; LITHIUM-ION; NANOCRYSTALLINE FE3O4; MAGNETITE FE3O4; LI; CARBON; STORAGE; NANOPARTICLES; ALPHA-FE2O3; NANOFIBERS; 02 engineering and technology; 540; 0210 nano-technology; 7. Clean energy

Abstract The iron-containing electrode material is a promising candidate for low-cost Na-ion batteries. In this work, the electrochemical properties of Fe 3 O 4 nanoparticles obtained by simple hydrothermal reaction are investigated as an anode material for Na-ion batteries. The Fe 3 O 4 with alginate binder delivers a reversible capacity of 248 mAh g −1 after 50 cycles at a current density of 83 mA g −1 (0.1C), while the electrode using polyvinylidene fluoride binder shows a gradually capacity fading to 79 mAh g −1 after 50 cycles. The high electrochemical performance can be ascribed to both the nano size of Fe 3 O 4 and excellent binding ability of alginate binder which can buffer large volume change. The mechanism of conversion reaction for Fe 3 O 4 is also tracked by combining electrochemical impedance spectroscopy analysis and magnetization measurement after electrochemical cycling. Finally, the Na-ion full cell consisting of the Fe 3 O 4 -alginate anode and the Na 3 V 2 (PO 4 ) 3 /graphene cathode is assembled to demonstrate performance of the Fe 3 O 4 anode for Na-ion batteries.