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GaNb O Nanowebs as High-Performance Anode Materials for Lithium-Ion Batteries Xiaoming Lou, Qingfeng Fu, Jian Xu, Xin Liu, Chunfu Lin, Jiaxing Han, Yunpeng Luo, Yongjun Chen, Xiaoyong Fan, and Jianbao Li ACS Appl. Nano Mater., Just Accepted Manuscript • DOI: 10.1021/acsanm.7b00091 • Publication Date (Web): 21 Dec 2017 Downloaded from http://pubs.acs.org on January 3, 2018
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ACS Applied Nano Materials
GaNb11O29 Nanowebs as High-Performance Anode Materials for Lithium-Ion Batteries Xiaoming Lou, †,§ Qingfeng Fu, †,§ Jian Xu, † Xin Liu, † Chunfu Lin,*,† Jiaxing Han, ‡ Yunpeng Luo, † Yongjun Chen, † Xiaoyong Fan, ‡ Jianbao Li† †
State Key Laboratory of Marine Resource Utilization in South China Sea, College of Materials and Chemical Engineering, Hainan University, Haikou 570228, China ‡
School of Materials Science and Engineering, Chang’an University, Xi’an 710061, China
KEYWORDS: GaNb11O29, anode, lithium-ion battery, nanoweb, electrospinning
ABSTRACT
M–Nb–O compounds have been considered as promising anode materials for lithium-ion batteries due to 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, which are constructed by interconnected GaNb11O29 nanowires with an average diameter of ~250 nm and a large specific
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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 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 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 (high capacity retention of 87.4% after 1000 cycles). These impressive results indicate that GaNb11O29-N is a high-performance anode material for lithium-ion batteries.
INTRODUCTION Lithium-ion batteries (LIBs) are regarded as a very promising power source for future large-scale applications, such as being used in electric vehicles, due to their high energy output, long storage life, high conversion efficiencies and minimal environmental impact.1–4 Graphite is the traditional anode material used for consumer LIBs. It exhibits a high specific capacity (theoretically 372 mAh g–1), is low in cost, and has a long cycling lifetime. However, it suffers from severe safety concerns in relation to the electrolyte reduction and the lithium-dendrite formation at its low working potential (
