Electrochemical performance and local cationic distribution in layered LiNi1/2Mn1/2O2 electrodes for lithium ion batteries

Liu, H; Wang, G; Park, J; Wang, J; Zhang, C

Electrochemical performance and local cationic distribution in layered LiNi1/2Mn1/2O2 electrodes for lithium ion batteries

Liu, H Wang, G Park, J Wang, J Zhang, C

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Publisher:: Pergamon
Publication Type:: Journal Article
Citation:: Liu Hao et al. 2009, 'Electrochemical performance and local cationic distribution in layered LiNi1/2Mn1/2O2 electrodes for lithium ion batteries', Pergamon, vol. 54, no. 6, pp. 1733-1736.
Issue Date:: 2009

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Field	Value	Language
dc.contributor.author	Liu, H	en_US
dc.contributor.author	Wang, G	en_US
dc.contributor.author	Park, J	en_US
dc.contributor.author	Wang, J	en_US
dc.contributor.author	Zhang, C	en_US
dc.date.accessioned	2011-02-07T06:19:09Z
dc.date.available	2011-02-07T06:19:09Z
dc.date.issued	2009	en_US
dc.identifier	2009005993	en_US
dc.identifier.citation	Liu Hao et al. 2009, 'Electrochemical performance and local cationic distribution in layered LiNi1/2Mn1/2O2 electrodes for lithium ion batteries', Pergamon, vol. 54, no. 6, pp. 1733-1736.	en_US
dc.identifier.issn	0013-4686	en_US
dc.identifier.other	C1	en_US
dc.identifier.uri	http://hdl.handle.net/10453/13146
dc.description.abstract	LiNi1/2Mn1/2O2 electrodes with layered structure were synthesized by solid-state reaction between lithium hydroxide and mixed Ni,Mn oxides obtained from co-precipitated Ni,Mn carbonates and hydroxides and freeze-dried Ni,Mn citrates. The temperature of the solid-state reaction was varied between 800 and 950 °C. This method of synthesis allows obtaining oxides characterized with well-crystallized nanometric primary particles bounded in micrometric aggregates. The extent of particle agglomeration is lower for oxides obtained from freeze-dried Ni,Mn citrates. The local Mn4+ surrounding in the transition metal layers was determined by X-band electron paramagnetic resonance (EPR) spectroscopy. It has been found that local cationic distribution is consistent with a,ß-type cationic order with some extent of disordering that depends mainly on the precursors used. The electrochemical extraction and insertion of lithium was tested in lithium cells using Step Potential Electrochemical Spectroscopy. The electrochemical performance of LiNi1/2Mn1/2O2 oxides depends on the precursors used, the synthesis temperature and the potential range. The best electrochemical response was established for LiNi1/2Mn1/2O2 prepared from the carbonate precursor at 900 °C. The changes in local environment of Mn4+ ions during electrochemical reaction in both limited and extended potential ranges were discussed on the basis of ex situ EPR experiments.	en_US
dc.publisher	Pergamon	en_US
dc.relation.ispartof	Verified OK	en_US
dc.relation.ispartof	Electrochimica Acta	en_US
dc.relation.isbasedon	http://dx.doi.org/10.1016/j.electacta.2008.09.061	en_US
dc.subject	Cathode materials; Layered oxides; Local cationic distribution; EPR spectroscopy; Lithium ion batteries	en_US
dc.subject.classification	Electrochemistry	en_US
dc.title	Electrochemical performance and local cationic distribution in layered LiNi1/2Mn1/2O2 electrodes for lithium ion batteries	en_US
dc.type	Journal article
utslib.citation.volume	54	en_US
utslib.citation.number	6	en_US
utslib.location	United Kingdom	en_US
utslib.citation.startpage	1733	en_US
utslib.citation.endpage	1736	en_US
utslib.identifier.org	SCI.Faculty of Science	en_US
utslib.for	030604	en_US
utslib.percentage	000100	en_US
utslib.copyright.status	closed_access

Abstract:

LiNi1/2Mn1/2O2 electrodes with layered structure were synthesized by solid-state reaction between lithium hydroxide and mixed Ni,Mn oxides obtained from co-precipitated Ni,Mn carbonates and hydroxides and freeze-dried Ni,Mn citrates. The temperature of the solid-state reaction was varied between 800 and 950 °C. This method of synthesis allows obtaining oxides characterized with well-crystallized nanometric primary particles bounded in micrometric aggregates. The extent of particle agglomeration is lower for oxides obtained from freeze-dried Ni,Mn citrates. The local Mn4+ surrounding in the transition metal layers was determined by X-band electron paramagnetic resonance (EPR) spectroscopy. It has been found that local cationic distribution is consistent with a,ß-type cationic order with some extent of disordering that depends mainly on the precursors used. The electrochemical extraction and insertion of lithium was tested in lithium cells using Step Potential Electrochemical Spectroscopy. The electrochemical performance of LiNi1/2Mn1/2O2 oxides depends on the precursors used, the synthesis temperature and the potential range. The best electrochemical response was established for LiNi1/2Mn1/2O2 prepared from the carbonate precursor at 900 °C. The changes in local environment of Mn4+ ions during electrochemical reaction in both limited and extended potential ranges were discussed on the basis of ex situ EPR experiments.

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http://hdl.handle.net/10453/13146