High volumetric capacity Fe2TeO6 as a novel anode material for alkali-ion batteries

Abstract

Tetragonal Fe2TeO6 (FTO) was successfully synthesized via simple calcination method and evaluated as anode materials of alkali-ion (lithium and sodium ion) batteries for the first time. Its physical properties were investigated by X-ray diffraction, scanning electron microscopy and transmission microscopy. Its electrochemical characteristics were studied via cyclic voltammetry and galvanostatic charge/discharge. The FTO materials exhibit excellent electrochemical performance in LIBs and SIBs. It can deliver a high reversible volumetric capacity of 1901.5 mA h cm−3 at 100 mA g−1 after 500 cycles as the anode of lithium-ion batteries. Furthermore, FTO shows impressive performance at higher current density. It maintains a discharge capacity of over 311.7 mA h cm−3 even at a current density of 2000 mA g−1. In addition, it also can deliver a discharge capacity of 574.9 mA h cm−3 after 500 cycles at 100 mA g−1 as the anode materials of sodium-ion batteries. These results indicate that FTO is a potential anode material for lithium ion and sodium ion batteries.