AgNb13O33: A new anode material with high energy storage performance

Abstract Anode materials for lithium ion batteries with environmental benignity and great electrochemical performance are greatly desired. In this work, AgNb 13 O 33 with open framework is reported as an anode material for the first time. It shows a triclinic lattice with 4i, 4f sites and 8j sites for lithium storage. At the current density of 100 mA g −1 , AgNb 13 O 33 delivers high initial charge/discharge capacity of 329.4/357.8 mAh g −1 with an initial Columbic efficiency of 92.06%. 500 cycles later, it still remains a reversible capacity of 214.2 mAh g −1 . Moreover, at a higher rate of 1000 mA g −1 , AgNb 13 O 33 still maintains an initial charge capacity of 203 mAh g −1 . Ex-situ transmission electron microscope (TEM) and in-situ X-ray diffraction (XRD) tests are performed to study the lithiation and delithiation reactions of AgNb 13 O 33 during the cycling. The reversibility and structural stability of the AgNb 13 O 33 make contributions to its excellent performance. All results show the promising possibility of applying AgNb 13 O 33 as an anode material for lithium ion batteries.