http://www.cnr.it/ontology/cnr/individuo/prodotto/ID307566

Etched colloidal LiFePO4 nanoplatelets toward high-rate capable Li-ion battery electrodes (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Etched colloidal LiFePO4 nanoplatelets toward high-rate capable Li-ion battery electrodes (Articolo in rivista) (literal)

Anno

2014-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1021/nl504093w (literal)

Alternative label

Paolella, Andrea; Bertoni, Giovanni; Marras, Sergio; Dilena, Enrico; Colombo, Massimo; Prato, Mirko; Riedinger, Andreas; Povia, Mauro; Ansaldo, Alberto; Zaghib, Karim; Manna, Liberato; George, Chandramohan (2014)
Etched colloidal LiFePO4 nanoplatelets toward high-rate capable Li-ion battery electrodes
in Nano letters (Print); American Chemical Society, Washington (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Paolella, Andrea; Bertoni, Giovanni; Marras, Sergio; Dilena, Enrico; Colombo, Massimo; Prato, Mirko; Riedinger, Andreas; Povia, Mauro; Ansaldo, Alberto; Zaghib, Karim; Manna, Liberato; George, Chandramohan (literal)

Pagina inizio

6828 (literal)

Pagina fine

6835 (literal)

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http://www.scopus.com/record/display.url?eid=2-s2.0-84916639036&origin=inward (literal)

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14 (literal)

Rivista

Nano letters (Rivista)

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8 (literal)

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12 (literal)

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Scopu (literal)

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Nanochemistry Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy; Institut de Recherche d'Hydro-Québec (IREQ),1800 Boulevard Lionel Boulet, Varennes, QC J3X1S1, Canada; IMEM-CNR, Parco Area delle Scienze 37/A, 43124 Parma, Italy; Optical Materials Engineering Laboratory, ETH Zurich, 8092 Zurich, Switzerland; Institute for Manufacturing, Department of Engineering, University of Cambridge, 17 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom (literal)

Titolo

Etched colloidal LiFePO4 nanoplatelets toward high-rate capable Li-ion battery electrodes (literal)

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. (literal)

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