Nano Archive

Sonochemical synthesis of nanostructured VOPO4テつテつキテつ2H2O/carbon nanotube composites with improved lithium ion battery performance

Sun, Yongfu and Wu, Changzheng and Xie, Yi (2010) Sonochemical synthesis of nanostructured VOPO4テつテつキテつ2H2O/carbon nanotube composites with improved lithium ion battery performance. Journal of Nanoparticle Research, 12 (2). pp. 417-427.

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Abstract

Transition metal phosphates have become of great interest as cathode materials for lithium ion batteries because of their high voltage, low cost and environmental friendliness. However, their low-intrinsic conductivity presents a major drawback to practical implementation. Here, nanocrystallization of VOPO4テつテつキテつ2H2O was first realized by a sonication-assisted intercalation-split mechanism in order to increase its diffusion coefficient and surface area contacting with electrolyte thus improving its capacity and cyclability; then nanocompounding of the above split nanocrystals and acid-functionalized multiwalled carbon nanotubes to form the resulting nanocomposites was successfully achieved by an adsorption-reintercalation mechanism to increase their conductivity thus enabling them to discharge at high rate with high efficiency. As expected, nanosized VOPO4テつテつキテつ2H2O possesses longer discharge plateau (average discharge voltage: 3.7テつV), higher capacity (93.4% of the theoretical capacity) and much better cyclability (retain 95.1% of the first discharge capacity after 50 cycles) than microsized VOPO4テつテつキテつ2H2O. Furthermore, the relatively high-rate capability of the nanocomposites, retaining 83% of the first discharge capacity, is remarkably improved compared with VOPO4テつテつキテつ2H2O microcrystals (retain only 31.7%). In brief, the use of nanocrystallization and nanocompounding techniques enables the high voltage, low cost, environmentally benign VOPO4テつテつキテつ2H2O to show the prospective signs for the future practical applications.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:8219
Deposited By:JNCASR
Deposited On:10 Feb 2010 09:10
Last Modified:10 Feb 2010 09:10

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