Imperial College London
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DrChandramohanGeorge

Faculty of Engineering, Dyson School of Design Engineering

Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 3423chandramohan.george

 
 
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Location

 

Dyson BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Paolella:2014:10.1021/nl504093w,
author = {Paolella, A and Bertoni, G and Marras, S and Dilena, E and Colombo, M and Prato, M and Riedinger, A and Povia, M and Ansaldo, A and Zaghib, K and Manna, L and George, C},
doi = {10.1021/nl504093w},
journal = {Nano Letters: a journal dedicated to nanoscience and nanotechnology},
pages = {6828--6835},
title = {Etched colloidal LiFePO4 nanoplatelets toward high-rate capable Li-Ion battery electrodes},
url = {http://dx.doi.org/10.1021/nl504093w},
volume = {14},
year = {2014}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - LiFePO4 has been intensively investigated as a cathode material in Li-ion batteries, as it can in principle enable the development of high power electrodes. LiFePO4, on the other hand, is inherently “plagued” by poor electronic and ionic conductivity. While the problems with low electron conductivity are partially solved by carbon coating and further by doping or by downsizing the active particles to nanoscale dimensions, poor ionic conductivity is still an issue. To develop colloidally synthesized LiFePO4 nanocrystals (NCs) optimized for high rate applications, we propose here a surface treatment of the NCs. The particles as delivered from the synthesis have a surface passivated with long chain organic surfactants, and therefore can be dispersed only in aprotic solvents such as chloroform or toluene. Glucose that is commonly used as carbon source for carbon-coating procedure is not soluble in these solvents, but it can be dissolved in water. In order to make the NCs hydrophilic, we treated them with lithium hexafluorophosphate (LiPF6), which removes the surfactant ligand shell while preserving the structural and morphological properties of the NCs. Only a roughening of the edges of NCs was observed due to a partial etching of their surface. Electrodes prepared from these platelet NCs (after carbon coating) delivered a capacity of ∼155 mAh/g, ∼135 mAh/g, and ∼125 mAh/g, at 1 C, 5 C, and 10 C, respectively, with significant capacity retention and remarkable rate capability. For example, at 61 C (10.3 A/g), a capacity of ∼70 mAh/g was obtained, and at 122 C (20.7 A/g), the capacity was ∼30 mAh/g. The rate capability and the ease of scalability in the preparation of these surface-treated nanoplatelets make them highly suitable as electrodes in Li-ion batteries.
AU  - Paolella,A
AU  - Bertoni,G
AU  - Marras,S
AU  - Dilena,E
AU  - Colombo,M
AU  - Prato,M
AU  - Riedinger,A
AU  - Povia,M
AU  - Ansaldo,A
AU  - Zaghib,K
AU  - Manna,L
AU  - George,C
DO  - 10.1021/nl504093w
EP  - 6835
PY  - 2014///
SN  - 1530-6984
SP  - 6828
TI  - Etched colloidal LiFePO4 nanoplatelets toward high-rate capable Li-Ion battery electrodes
T2  - Nano Letters: a journal dedicated to nanoscience and nanotechnology
UR  - http://dx.doi.org/10.1021/nl504093w
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000346322800013&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://pubs.acs.org/doi/10.1021/nl504093w
VL  - 14
ER  -
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