Journal
JOURNAL OF POWER SOURCES
Volume 234, Issue -, Pages 292-301Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.01.091
Keywords
Lithium titanium phosphate; Lithium ion batteries; Ball-milling; Sol-gel method
Funding
- National Natural Science Foundation of China [51202209]
- Doctoral Fund of Ministry of Education of China [20114301120007]
- China Postdoctoral Science Foundation [20100480954]
- Hunan Provincial Natural Science Foundation of China [11JJ4038]
- Scientific Research Fund of Xiangtan University [09XZX10]
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Lithium titanium phosphate (LiTi2(PO4)(3)) has been successfully synthesized by a polyvinyl alcohol (PVA) assisted sol-gel method. To further improve its electrochemical properties, a ball-milling process with various amount of acetylene black (AB) has been used to form LiTi2(PO4)(3)-AB nanocomposites (the weight ratio of acetylene black is 5 wt.%, 10 wt.%, 15 wt.% and 20 wt.%). The samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Electrochemical performance of the samples is characterized by the charge-discharge test, cyclic voltammetry (CV), electrochemical impedance spectroscopic studies (EIS), and galvanostatic intermittent titration technique (GITT). The results show that the ball-milling process enables LiTi2(PO4)(3) nanoparticles to network with conductive acetylene black, which offers better electrochemical performance. Especially, LiTi2(PO4)(3)-AB nanocomposite with 15 wt.% acetylene black shows the best electrochemical properties, which delivers the highest specific capacity and the best cycle performance. Besides, the thermodynamics properties of as-prepared samples are also been studied. (c) 2013 Elsevier B.V. All rights reserved.
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