GaNb11O29 Nanowebs as High-Performance Anode Materials for Lithium-Ion Batteries
GaNb11O29 Nanowebs as High-Performance Anode Materials for Lithium-Ion Batteries
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GaNb11O29 纳米网作为锂离子电池的高性能负极材料
DOI：
10.1021/acsanm.7b00091
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发表时间：
2018-01-01
影响因子：
5.9
通讯作者：
Li, Jianbao
中科院分区：
文献类型：
--
作者：
Lou, Xiaoming;Fu, Qingfeng;Li, Jianbao
M-Nb-O化合物具有高容量、安全性和循环稳定性等优点，被认为是锂离子电池负极材料的发展方向。然而，迄今为止，已经开发了非常有限的M-Nb-O阳极材料。在此，具有剪切ReO 3晶体结构和379 mAh的高理论容量的GaNb 11 O29作为M-Nb-O家族中的新成员被深入探索。首次采用简单的单纤维静电纺丝技术合成了GaNb 11 O29纳米线，其平均直径为~ 250 nm，比表面积为10.26 m（2）g（-1）。这种有趣的结构提供了良好的结构稳定性、受限的自聚集、大的电化学反应面积和快速的电子/Li离子传输，从而导致GaNbi 1029-N的显著的赝电容行为和突出的电化学性能。在0.1摄氏度下，它显示出高比容量（264 mAh g（-1）），具有安全工作电位（1.69 V vs Li/Lit）和所有已知M-Nb-O阳极材料中最高的第一循环库仑效率（96.5%）。在10 ℃时，它表现出优异的上级倍率性能（175 mAh g（-1）的高容量）和持久的循环稳定性（1000次循环后87.4%的高容量保持率）。这些令人印象深刻的结果表明，GaNb 11 O29-N是一种高性能的LIB阳极材料。
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.