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

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journal contribution
posted on 2017-12-21, 00:00 authored by Xiaoming Lou, Qingfeng Fu, Jian Xu, Xin Liu, Chunfu Lin, Jiaxing Han, Yunpeng Luo, Yongjun Chen, Xiaoyong Fan, Jianbao Li
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 ReO3 crystal structure and a high theoretical capacity of 379 mAh g–1 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 m2 g–1. This intriguing architecture affords good structural stability, restricted self-aggregation, a large electrochemical reaction area, and fast electron/Li+-ion transport, leading to a significant pseudocapacitive behavior and outstanding electrochemical properties of GaNb11O29–N. At 0.1 C, it shows a high specific capacity (264 mAh g–1) with a safe working potential (1.69 V vs Li/Li+) and the highest first-cycle Coulombic efficiency in all of the known M–Nb–O anode materials (96.5%). At 10 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.

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