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LiFePO4 – 3D carbon nanofiber composites as cathode materials for Li-ions batteries

Dimesso, L. and Spanheimer, C. and Jaegermann, W. and Zhang, Y. and Yarin, A. L. (2012):
LiFePO4 – 3D carbon nanofiber composites as cathode materials for Li-ions batteries.
In: Journal of Applied Physics, American Institute of Physics Publishing, pp. 064307, 111, (6), ISSN 00218979, [Online-Edition: http://dx.doi.org/10.1063/1.3693575],
[Article]

Abstract

The characterization of carbon nanofiber 3D nonwovens, prepared by electrospinning process, coated with olivine structured lithium iron phosphate is reported. The LiFePO4 as cathode material for lithium ion batteries was prepared by a Pechini-assisted reversed polyol process. The coating has been successfully performed on carbon nanofiber 3D nonwovens by soaking in aqueous solution containing lithium, iron salts and phosphates at 70 degrees C for 2-4 h. After drying-out, the composites were annealed at 600 degrees C for 5 h under nitrogen. The surface investigation of the prepared composites showed a uniform coating of the carbon nonwoven nanofibers as well as the formation of cauliflower-like crystalline structures which are uniformly distributed all over the surface area of the carbon nanofibers. The electrochemical measurements on the composites showed good performances delivering a discharge specific capacity of 156 mAhg(-1) at a discharging rate of C/25 and 152 mAhg(-1) at a discharging rate of C/10 at room temperature.

Item Type: Article
Erschienen: 2012
Creators: Dimesso, L. and Spanheimer, C. and Jaegermann, W. and Zhang, Y. and Yarin, A. L.
Title: LiFePO4 – 3D carbon nanofiber composites as cathode materials for Li-ions batteries
Language: English
Abstract:

The characterization of carbon nanofiber 3D nonwovens, prepared by electrospinning process, coated with olivine structured lithium iron phosphate is reported. The LiFePO4 as cathode material for lithium ion batteries was prepared by a Pechini-assisted reversed polyol process. The coating has been successfully performed on carbon nanofiber 3D nonwovens by soaking in aqueous solution containing lithium, iron salts and phosphates at 70 degrees C for 2-4 h. After drying-out, the composites were annealed at 600 degrees C for 5 h under nitrogen. The surface investigation of the prepared composites showed a uniform coating of the carbon nonwoven nanofibers as well as the formation of cauliflower-like crystalline structures which are uniformly distributed all over the surface area of the carbon nanofibers. The electrochemical measurements on the composites showed good performances delivering a discharge specific capacity of 156 mAhg(-1) at a discharging rate of C/25 and 152 mAhg(-1) at a discharging rate of C/10 at room temperature.

Journal or Publication Title: Journal of Applied Physics
Volume: 111
Number: 6
Publisher: American Institute of Physics Publishing
Uncontrolled Keywords: Carbon, Lithium, Annealing, Electrodeposition, Composite Materials, Crystal structure, Electrochemistry, Electrodes, Lithium ion batteries, Surface structure
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Surface Science
Zentrale Einrichtungen
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Date Deposited: 26 Nov 2013 09:51
Official URL: http://dx.doi.org/10.1063/1.3693575
Identification Number: doi:10.1063/1.3693575
Funders: The authors thank the Deutsche Forschungsgemeinschaft (DFG) (Project: PAK-177) and the Excellency Cluster Center of Smart Interfaces (CSI) for the financial support during this work. , The DFG promote and support financially the publication of the scientific results obtained during the projects., YZ and ALY are also grateful for the partial support of their work by National Science Foundation through the Grant CBET-0966764.
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