Investigation of a Carbon Nanotube-Encapsulated Fe1−Xs Composite as Anode for Sodium-Ion Batteries

Wednesday, 4 October 2017
Prince George's Exhibit Hall D/E (Gaylord National Resort and Convention Center)
S. PARK and Y. K. Sun (Department of Energy Engineering, Hanyang University)
Owing to the long life span and high energy density, lithium-ion batteries (LIBs) have received worldwide application in our daily lives for powering portable devices and burdening electric vehicles (EVs) and hybrid EVs. A promising anode material consisting of Fe1xS nanoparticles and bamboo-like carbon nanotubes (CNTs) has been designed and prepared by an effective in situ chemical transformation. The resultant Fe 1xS@CNTs with a three-dimensional network not only provide high conductivity paths and channels for electrons and ions but also offer the combined merits of iron sulfide and CNTs in electrochemical energy storage applications, leading to outstanding performance as an anode material for sodium-ion batteries. When tested in a half-cell, a high capacity of 449.2 mAh g1 can be retained after 200 cycles at 500 mA g1, corresponding to a high retention of 97.4%. Even at 8000 mA g1, a satisfactory capacity of 326.3 mAh g1 can be delivered. When tested in the full cell, a capacity of 438.5 mAh g1 with capacity retention of 85.0% is manifested after 80 cycles based on the mass of the anode. The appealing structure and electrochemical performance of this material demonstrate its great promise for applications in practical rechargeable batteries.