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dc.contributor.author
Paolella, Andrea
dc.contributor.author
Bertoni, Giovanni
dc.contributor.author
Marras, Sergio
dc.contributor.author
Dilena, Enrico
dc.contributor.author
Colombo, Massimo
dc.contributor.author
Prato, Mirko
dc.contributor.author
Riedinger, Andreas
dc.contributor.author
Povia, Mauro
dc.contributor.author
Ansaldo, Alberto
dc.contributor.author
Zaghib, Karim
dc.contributor.author
Mann, Liberato
dc.contributor.author
George, Chandramohan
dc.date.accessioned
2022-08-25T10:45:44Z
dc.date.available
2017-06-11T15:20:18Z
dc.date.available
2022-08-25T10:45:44Z
dc.date.issued
2014-12-10
dc.identifier.issn
1530-6984
dc.identifier.issn
1530-6992
dc.identifier.other
10.1021/nl504093w
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/96044
dc.identifier.doi
10.3929/ethz-b-000096044
dc.description.abstract
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.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Chemical Society
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.subject
Li ion batteries
en_US
dc.subject
Nanocrystals
en_US
dc.subject
Etching
en_US
dc.subject
Platelets
en_US
dc.subject
High rate copability
en_US
dc.subject
Electrodes
en_US
dc.title
Etched Colloidal LiFePO4 Nanoplatelets toward High-Rate Capable Li-Ion Battery Electrodes
en_US
dc.type
Journal Article
dc.rights.license
In Copyright - Non-Commercial Use Permitted
dc.date.published
2014-11-05
ethz.journal.title
Nano Letters
ethz.journal.volume
14
en_US
ethz.journal.issue
12
en_US
ethz.journal.abbreviated
Nano Lett
ethz.pages.start
6828
en_US
ethz.pages.end
6835
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-06-11T15:20:45Z
ethz.source
ECIT
ethz.identifier.importid
imp593652c9eeaf447441
ethz.ecitpid
pub:150610
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-31T12:28:11Z
ethz.rosetta.lastUpdated
2023-02-07T05:38:24Z
ethz.rosetta.versionExported
true
ethz.COinS
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