期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 22, 期 -, 页码 S157-S161出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(12)61702-6
关键词
lithium-ion batteries; cathode material; LiVPO4F; one-step solid-state reaction; two-step solid-state reaction
资金
- National Natural Science Foundation of China [51164007]
- China Postdoctoral Science Foundation [2011M501288]
LiVPO4F/C samples were synthesized by one-step solid-state reaction and two-step solid-state reaction methods, respectively. The X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical performance tests were adopted to characterize the properties of LiVPO4F/C. XRD results show that the LiVPO4F/C samples prepared by one-step solid-state reaction method have the same triclinic structure (space group p (1) over bar) as that synthesized by conventional two-step solid-state reaction. SEM image exhibits that the particle size of LiVPO4F/C prepared by one-step solid-state reaction method is smaller than that of the sample synthesized by two-step solid-state reaction. The improved electrochemical properties of the LiVPO4F/C are attributed to the depressed grain size and enhanced electrical conductivity produced via one-step solid-state reaction method using oxalic acid as both reduction agent and carbon sources. AC impedance measurements also show that the LiVPO4F/C synthesized by one-step solid-state reaction route significantly decreases the charge-transfer resistance.
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