Carbon-coated V2O5 nanoparticles with enhanced electrochemical performance as a cathode material for lithium ion batteries
Carbon-coated V2O5 nanoparticles with enhanced electrochemical performance as a cathode material for lithium ion batteries
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DOI：
10.1016/j.jallcom.2013.11.212
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发表时间：
2014-03-15
影响因子：
6.2
通讯作者：
Kim, Jongsik
中科院分区：
文献类型：
--
作者：
Shin, Jihyun;Jung, Hyeyun;Kim, Jongsik
五氧化二钒(V2O5)具有价格低廉、储量丰富、理论容量高等优点，是一种很有前途的高能锂离子电池正极材料。V2O5在2.0-4.0V和1.5-4.0V时的理论容量分别为294 mA h g(-1)和441 mA h g(-1)，分别对应于与两个和三个锂离子的氧化还原反应。然而，V2O5的电导率低，锂离子扩散速度慢，导致循环稳定性和倍率能力较差。在本研究中，将V2O5前驱体((NH4)2)[VO(C2O4)(2)]浸渍到泡沫碳中，并在惰性气氛下进行控制热处理，以一种简便、可扩展的方法合成了碳包覆V2O5。与纳米V2O5相比，碳包覆V2O5表现出更好的循环稳定性和倍率能力。(C)2013爱思唯尔B.V.保留所有权利。
Vanadium pentoxide (V2O5) is a promising cathode material for high energy Li-ion batteries (LIBs), because of its low cost, abundance, and high theoretical capacity. V2O5 has a theoretical capacity of 294 mA h g(-1) at 2.0-4.0 V and 441 mA h g(-1) at 1.5-4.0 V, corresponding to redox reactions with two and three lithium ions, respectively. However, V2O5 has disadvantages of low electrical conductivity and slow lithium ion diffusion, resulting in poor cycling stability and rate capability. In this study, carbon-coated V2O5 is synthesized by impregnating the aqueous V2O5 precursor ((NH4()2)[VO(C2O4)(2)]) into the pores of a carbon foam, and controlled thermal treatment under an inert atmosphere in a facile and scalable method. The carbon-coated V2O5 shows enhanced cycling stability and rate capability compared to nano-sized V2O5. (C) 2013 Elsevier B. V. All rights reserved.