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Article: Preparation of β-MnO 2 nanocrystal/acetylene black composites for lithium batteries

TitlePreparation of β-MnO 2 nanocrystal/acetylene black composites for lithium batteries
Authors
Issue Date2003
PublisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/Publishing/Journals/jm/index.asp
Citation
Journal Of Materials Chemistry, 2003, v. 13 n. 12, p. 2989-2995 How to Cite?
AbstractComposites consisting of β-MnO 2 nanocrystals and acetylene black were synthesized by thermal decomposition of Mn(NO 3) 2 with acetylene black. The effects of heating temperature and specific surface area (S BET) of the starting acetylene black on the formation and properties of the composite were investigated. The decomposition of Mn(NO 3) 2 mixed with acetylene black progressed at a lower temperature than that of Mn(NO 3) 2 alone. The formation and the size of β-MnO 2 nanocrystals depended strongly on the heating temperature (T) and S BET of the starting acetylene black. The β-MnO 2/acetylene black composite could be produced for acetylene black of S BET = 60 m 2 g -1 at 160°C ≤ T ≤ 320°C and S BET = 133 m 2 g -1 at 160°C ≤ T ≤ 300°C. However, the composite could not be obtained for acetylene black with larger specific surface area (S BET = 300 m 2 g -1). The size of β-MnO 2 nanocrystals decreases and their dispersion in the composites increases with an increase in the S BET or the heating temperature. The lithium insertion behavior and voltage feature in the first discharge process depend strongly on the size of the β-MnO 2 nanocrystals as well as their dispersion. The electrochemical lithium insertion progressed topotactically for well-dispersed β-MnO 2 nanocrystals, retaining the framework of their rutile structure to permit a large amount of lithium insertion (Li/Mn = 1.15 in the solid). The charge/ discharge curves showed a flat voltage plateau around 2.8 V and a stable cycling feature up to the 20th cycle. It is likely that the easy lattice expansion of β-MnO 2 nanocrystals along the a crystal axis plays an important role in the topotactic lithium insertion/extraction reactions.
Persistent Identifierhttp://hdl.handle.net/10722/151122
ISSN
2013 Impact Factor: 6.626
2015 SCImago Journal Rankings: 2.540
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTang, Wen_US
dc.contributor.authorYang, Xen_US
dc.contributor.authorLiu, Zen_US
dc.contributor.authorOoi, Ken_US
dc.date.accessioned2012-06-26T06:17:21Z-
dc.date.available2012-06-26T06:17:21Z-
dc.date.issued2003en_US
dc.identifier.citationJournal Of Materials Chemistry, 2003, v. 13 n. 12, p. 2989-2995en_US
dc.identifier.issn0959-9428en_US
dc.identifier.urihttp://hdl.handle.net/10722/151122-
dc.description.abstractComposites consisting of β-MnO 2 nanocrystals and acetylene black were synthesized by thermal decomposition of Mn(NO 3) 2 with acetylene black. The effects of heating temperature and specific surface area (S BET) of the starting acetylene black on the formation and properties of the composite were investigated. The decomposition of Mn(NO 3) 2 mixed with acetylene black progressed at a lower temperature than that of Mn(NO 3) 2 alone. The formation and the size of β-MnO 2 nanocrystals depended strongly on the heating temperature (T) and S BET of the starting acetylene black. The β-MnO 2/acetylene black composite could be produced for acetylene black of S BET = 60 m 2 g -1 at 160°C ≤ T ≤ 320°C and S BET = 133 m 2 g -1 at 160°C ≤ T ≤ 300°C. However, the composite could not be obtained for acetylene black with larger specific surface area (S BET = 300 m 2 g -1). The size of β-MnO 2 nanocrystals decreases and their dispersion in the composites increases with an increase in the S BET or the heating temperature. The lithium insertion behavior and voltage feature in the first discharge process depend strongly on the size of the β-MnO 2 nanocrystals as well as their dispersion. The electrochemical lithium insertion progressed topotactically for well-dispersed β-MnO 2 nanocrystals, retaining the framework of their rutile structure to permit a large amount of lithium insertion (Li/Mn = 1.15 in the solid). The charge/ discharge curves showed a flat voltage plateau around 2.8 V and a stable cycling feature up to the 20th cycle. It is likely that the easy lattice expansion of β-MnO 2 nanocrystals along the a crystal axis plays an important role in the topotactic lithium insertion/extraction reactions.en_US
dc.languageengen_US
dc.publisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/Publishing/Journals/jm/index.aspen_US
dc.relation.ispartofJournal of Materials Chemistryen_US
dc.titlePreparation of β-MnO 2 nanocrystal/acetylene black composites for lithium batteriesen_US
dc.typeArticleen_US
dc.identifier.emailLiu, Z:zhliu@hku.hken_US
dc.identifier.authorityLiu, Z=rp00750en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1039/b306780gen_US
dc.identifier.scopuseid_2-s2.0-0347480343en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0347480343&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume13en_US
dc.identifier.issue12en_US
dc.identifier.spage2989en_US
dc.identifier.epage2995en_US
dc.identifier.isiWOS:000186907500032-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridTang, W=37105120300en_US
dc.identifier.scopusauthoridYang, X=7406492282en_US
dc.identifier.scopusauthoridLiu, Z=16177844800en_US
dc.identifier.scopusauthoridOoi, K=7005970925en_US

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