期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 509, 期 17, 页码 5408-5413出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.02.067
关键词
Li-ion battery; alpha-LiFeO2-C nanocomposite; Molten salt; Porous architecture
资金
- Australian Research Council (ARC) under an ARC Centre of Excellence [CE0561616]
- ARC [DP0987805]
In this work, we describe for the first time a high surface area nanocrystalline porous alpha-LiFeO2-C composite anode material synthesized by a simple molten salt method, followed by a carbon coating process. The synthesized nanocomposite presents an interconnected porous architecture, as was confirmed by field emission scanning electron microscope observations. Transmission electron microscope investigations revealed that amorphous carbon was incorporated into the pores among the nanoparticles and that some nanoparticles were covered by a thin layer of amorphous carbon as well. Electrochemical measurements showed that the carbon played an important role, as it affected both the cycle life and the rate capability of the electrode. The alpha-LiFeO2-C nanocomposite electrode delivered a higher reversible capacity and good cycle stability (540 mAh g(-1) at 1 C after 200 cycles) compared to the pure alpha-LiFeO2-C electrode. Good electrochemical performance of the alpha-LiFeO2-C nanocomposite electrode could be attributed to the porous conductive architecture among the nanoparticles, which not only has benefits in terms of decreasing the absolute volume changes and increasing the mobility of lithium ions, but also offers conductive pathways along the whole interconnected wall in the structure, which is favourable for the transport of electrons, promotes liquid electrolyte diffusion into the bulk material, and acts as a buffer zone to absorb the volume changes. Our results indicate that alpha-LiFeO2-C nanocomposite could be considered as a potential anode material for lithium-ion batteries. (C) 2011 Elsevier B. V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据