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One-pot synthesis of Li_3VO_4@C nanofibers by electrospinning with enhanced electrochemical performance for lithium-ion batteries

查看全文 作　　者：Ruihuan [1]Qin;Gaoqi [1]Shao;Junxian [2]Hou;Zhi [1]Zheng;Tianyou [1]Zhai;Huiqiao [1]Li 高影响力作者 机构地区：[1]State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST);[2]Department of Composite Materials and Engineering, College of Materials Science and Engineering, Hebei University of Engineering高影响力机构 出　　处：《Science Bulletin》索引2017年第62卷第15期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (21571073, 51302099, 51472097);the Ministry of Science and Technology of China (2015CB932600);the Hubei Provincial Natural Science Foundation (2016CFA031);the Program for Huazhong University of Science and Technology (HUST) Interdisciplinary Innovation Team (2015ZDTD038);the Fundamental Research Funds for the Central University (2017KFKJXX007) 摘　　要：Electrospinning is firstly used to one-pot synthesis of Li_3VO_4@C nanofibers in a large scale. Although with the presence of organic sources in synthesis process, the pure phase Li_3VO_4 with superior nanofibrous morphology is still successfully obtained through adjusting different heat treatment processes and different vanadium sources. The prepared Li_3VO_4@C nanofibers exhibit a unique structure in which nanosized Li_3VO_4 particles are uniformly embedded in amorphous carbon matrix. Compared with Li_3VO_4/C powder,Li_3VO_4@C nanofibers display enhanced reversible capacity of 451 mAh g^(-1)at 40 mAg^(-1)with an increased initial coulombic efficiency of 82.3%, and the capacity can remain at 394 m Ah g^(-1)after 100 cycles. This superior electrochemical performance can be attributed to its unique structure which ensures a high reactivity by nanosized Li_3VO_4, more stable electrode/electrolyte interface by carbon encapsulation, improved electronic conductivity and buffered volume changes by flexible carbon matrix. The electrospinning technology provides an effective method to obtain high performance Li_3VO_4 as a promising anode material for lithium-ion batteries. 关 键 词：碳纳米纤维 电化学性能 一锅法合成 锂离子电池 纺丝技术 静电 热处理工艺 电子电导率
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