Carbon nanotube enhanced printed Li-ion cathodes

Energy storage is unable to keep up with the shrinking size of consumer electronic. A simple method is used to create a thin film battery. The electrodes materials comprises of active material,75wt% (lithium cobalt oxide (LiCoO2) and lithium iron phosphate (LiFePO4) for cathode; graphite for anode)...

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Main Author: Lee, Ying Wei.
Other Authors: Srinivasan Madhavi
Format: Final Year Project
Language:English
Published: 2010
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Online Access:http://hdl.handle.net/10356/35244
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-352442023-03-04T15:33:11Z Carbon nanotube enhanced printed Li-ion cathodes Lee, Ying Wei. Srinivasan Madhavi School of Materials Science and Engineering DRNTU::Engineering::Materials Energy storage is unable to keep up with the shrinking size of consumer electronic. A simple method is used to create a thin film battery. The electrodes materials comprises of active material,75wt% (lithium cobalt oxide (LiCoO2) and lithium iron phosphate (LiFePO4) for cathode; graphite for anode) polyvinylidene fluoride (PVDF),15wt% and carbon black (CB),10wt% were prepared into a paste and printed with a doctor blade. The coating was then dried, cut into 16mm round electrodes and assembled into coin cells for testing. The capacity achieved by the LiCoO2 and LiFePO4 cells was 106mAh/g and 66mAh/g respectively. LiFePO4 has a higher theoretical capacity but does not perform as expected due to the low intrinsic conductivity. In order to improve the conductivity of LiFePO4, additional conductive additive were added by decreasing the active material to improve the conductivity. With 5wt% carbon nanotube(CNT) added to the paste, the capacity increased to 103mAh/g. Addition amount of carbon black amounting to 20wt% was added to the paste, the capacity only increase to 74mAh/g. The difference in performance achieved by the CNT and CB cells is an indication in the improvement of the conductivity. A higher capacity related to a higher conductivity. The conductivity improvement achieved by CNT is much better than that of CB. In order to further confirm the improvement, a reduced carbon content composition was tested, 5wt% CB with 5wt%CNT. The achieved capacity was 96mAh/g. This further confirms that CB does not increase the conductivity as much as CNT. The results were then plotted into a ragone graph; LiFePO4 with CNT has the highest energy density while LiCoO2 has the highest power density. Bachelor of Engineering (Materials Engineering) 2010-04-12T06:02:45Z 2010-04-12T06:02:45Z 2010 2010 Final Year Project (FYP) http://hdl.handle.net/10356/35244 en Nanyang Technological University 38 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Materials
spellingShingle DRNTU::Engineering::Materials
Lee, Ying Wei.
Carbon nanotube enhanced printed Li-ion cathodes
description Energy storage is unable to keep up with the shrinking size of consumer electronic. A simple method is used to create a thin film battery. The electrodes materials comprises of active material,75wt% (lithium cobalt oxide (LiCoO2) and lithium iron phosphate (LiFePO4) for cathode; graphite for anode) polyvinylidene fluoride (PVDF),15wt% and carbon black (CB),10wt% were prepared into a paste and printed with a doctor blade. The coating was then dried, cut into 16mm round electrodes and assembled into coin cells for testing. The capacity achieved by the LiCoO2 and LiFePO4 cells was 106mAh/g and 66mAh/g respectively. LiFePO4 has a higher theoretical capacity but does not perform as expected due to the low intrinsic conductivity. In order to improve the conductivity of LiFePO4, additional conductive additive were added by decreasing the active material to improve the conductivity. With 5wt% carbon nanotube(CNT) added to the paste, the capacity increased to 103mAh/g. Addition amount of carbon black amounting to 20wt% was added to the paste, the capacity only increase to 74mAh/g. The difference in performance achieved by the CNT and CB cells is an indication in the improvement of the conductivity. A higher capacity related to a higher conductivity. The conductivity improvement achieved by CNT is much better than that of CB. In order to further confirm the improvement, a reduced carbon content composition was tested, 5wt% CB with 5wt%CNT. The achieved capacity was 96mAh/g. This further confirms that CB does not increase the conductivity as much as CNT. The results were then plotted into a ragone graph; LiFePO4 with CNT has the highest energy density while LiCoO2 has the highest power density.
author2 Srinivasan Madhavi
author_facet Srinivasan Madhavi
Lee, Ying Wei.
format Final Year Project
author Lee, Ying Wei.
author_sort Lee, Ying Wei.
title Carbon nanotube enhanced printed Li-ion cathodes
title_short Carbon nanotube enhanced printed Li-ion cathodes
title_full Carbon nanotube enhanced printed Li-ion cathodes
title_fullStr Carbon nanotube enhanced printed Li-ion cathodes
title_full_unstemmed Carbon nanotube enhanced printed Li-ion cathodes
title_sort carbon nanotube enhanced printed li-ion cathodes
publishDate 2010
url http://hdl.handle.net/10356/35244
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