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, AgNb13O33 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, AgNb13O33 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, AgNb13O33 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 AgNb13O33 during the cycling. The reversibility and structural stability of the AgNb13O33 make contributions to its excellent performance. All results show the promising possibility of applying AgNb13O33 as an anode material for lithium ion batteries.