Synthesis of Li₂CoTi₃O₈ fibers and their application to lithium-ion batteries

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• 作者：Li Wang ; Qizhen Xiao ; Zhaohui Li ; Gangtie Lei ; Lijuan Wu ; Ping Zhang ; Jun Mao
• 关键词：Electrospinning ; Nanoparticles ; Composite materials ; Anode ; Lithium-ion batteries
• 刊名：Electrochimica Acta
• 出版年：2012
• 出版时间：30 August, 2012
• 年：2012
• 卷：77
• 期：Complete
• 页码：77-82
• 全文大小：1032 K

文摘

Li₂CoTi₃O₈ fibers have been synthesized by an electrospinning method and investigated as an anode material for rechargeable lithium-ion batteries. The structure and electrochemical properties of the Li₂CoTi₃O₈ fibers were systematically investigated. Characterization of data collected with high-resolution transmission electron microscopy and scanning electron microscopy reveal that the Li₂CoTi₃O₈ fibers have an average diameter of 300 nm, and the individual fiber is composed of nanoparticles with an average diameter of 48 nm. The nanoparticles not only shorten the distance for Li-ions and electrons to transport but also possess good electrodes electronic contact and high surface area. The results of electrochemical measurements show that the as-prepared Li₂CoTi₃O₈ electrode deliver a specific capacity of 388 mAh g^?1 for the first cycle with an irreversible capacity of 156 mAh g^?1 and finally remains 237 mAh g^?1 after 30 cycles at 50 mA g^?1. Its electrochemical performance at subsequent cycles exhibits high cycling capacity and rate capability.