GaNb11O29 Nanowebs as High-Performance Anode Materials for Lithium-Ion Batteries

M-Nb-O compounds have been considered as promising anode materials for lithium-ion batteries (LIBs) because of their high capacities, safety, and cyclic stability. However, very limited M-Nb-O anode materials have been developed thus far. Herein, GaNb11O29 with a shear Re03 crystal structure and a high theoretical capacity of 379 mAh is intensively explored as a new member in the M-Nb-O family. GaNb11O29 nanowebs (GaNb11O29-N) are synthesized based on a facile single-spinneret electrospinning technique for the first time and are constructed by interconnected GaNb11O29 nanowires with an average diameter of-250 nm and a large specific surface area of 10.26 m(2) g(-1). This intriguing architecture affords good structural stability, restricted self-aggregation, a large electrochemical reaction area, and fast electron/Lit-ion transport, leading to a significant pseudocapacitive behavior and outstanding electrochemical properties of GaNbi 1029-N. At 0.1 degrees C, it shows a high specific capacity (264 mAh g(-1)) with a safe working potential (1.69 V vs Li/Lit) and the highest first-cycle Coulombic efficiency in all of the known M-Nb-O anode materials (96.5%). At 10 degrees C, it exhibits a superior rate capability (a high capacity of 175 mAh g(-1)) and a durable cyclic stability (a high capacity retention of 87.4% after 1000 cycles). These impressive results indicate that GaNb11O29-N is a high-performance anode material for LIBs.