Constructing Highly Graphitized Carbon-Wrapped Li3VO4 Nanoparticles with Hierarchically Porous Structure as a Long Life and High Capacity Anode for Lithium-Ion Batteries.
Constructing Highly Graphitized Carbon-Wrapped Li3VO4 Nanoparticles with Hierarchically Porous Structure as a Long Life and High Capacity Anode for Lithium-Ion Batteries.
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DOI：
10.1021/acsami.5b05269
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发表时间：
2015-11
影响因子：
9.5
通讯作者：
Di Zhao;Mi-Dan Cao
中科院分区：
文献类型：
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作者：
Di Zhao;Mi-Dan Cao
采用一种简便的绿色冷冻干燥和原位碳化的方法制备了嵌于高度石墨化的层状多孔结构的连续碳网络中的Li3VO4纳米粒子(HP-Li3VO4/C)。由于其独特的微观结构，合成的HP-Li3VO4/C作为锂离子电池负极材料，在比容量、循环稳定性和倍率性能等方面表现出优异的储锂性能。具体地说，它在0.2Ag(-1)下对300次循环提供了381mAhg(-1)的极高容量，即使在高达4Ag(-1)的速率下，在500次循环后仍能保持275mAhg(-1)的高可逆容量。这种优异的电化学性能可以归因于Li3VO4纳米粒子包裹着高度石墨化的碳导电骨架和层次化的多孔结构。本工作为锂离子电池其他电极材料的制备提供了一种新的方法。
Li3VO4 nanoparticles (NPs) embedded in a continuous, highly graphitized carbon network with an interconnected hierarchically porous structure (HP-Li3VO4/C) were prepared using a facile, green freeze-drying method followed by in situ carbonizing. Because of its unique microstructure, the resultant HP-Li3VO4/C exhibits excellent lithium storage performance in terms of specific capacity, cycling stability, and rate capability when used as an anode material in lithium-ion batteries (LIBs). Specifically, it delivers an extremely high capacity of 381 mAh g(-1) for up to 300 cycles at 0.2 A g(-1), and even at a rate as high as 4 A g(-1), a high reversible capacity of 275 mAh g(-1) can be retained after testing for 500 cycles. This excellent electrochemical performance can be attributed to Li3VO4 NPs wrapped with highly graphitized carbon conductive framework and hierarchically porous structure. This work may offer a new methodology for the preparation of other electrode materials for LIBs.