静电纺丝
法拉第效率
材料科学
阳极
纳米纤维
电解质
电化学
电极
锂(药物)
碳纳米纤维
纳米技术
化学工程
复合材料
化学
碳纳米管
聚合物
医学
工程类
物理化学
内分泌学
作者
Ruihuan Qin,Gaoqi Shao,Junxian Hou,Zhi Zheng,Tianyou Zhai,Huiqiao Li
标识
DOI:10.1016/j.scib.2017.07.001
摘要
Electrospinning is firstly used to one-pot synthesis of Li3VO4@C nanofibers in a large scale. Although with the presence of organic sources in synthesis process, the pure phase Li3VO4 with superior nanofibrous morphology is still successfully obtained through adjusting different heat treatment processes and different vanadium sources. The prepared Li3VO4@C nanofibers exhibit a unique structure in which nanosized Li3VO4 particles are uniformly embedded in amorphous carbon matrix. Compared with Li3VO4/C powder, Li3VO4@C nanofibers display enhanced reversible capacity of 451mAhg-1 at 40mAg-1 with an increased initial coulombic efficiency of 82.3%, and the capacity can remain at 394mAhg-1 after 100 cycles. This superior electrochemical performance can be attributed to its unique structure which ensures a high reactivity by nanosized Li3VO4, 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 Li3VO4 as a promising anode material for lithium-ion batteries.
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