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New materials for Li-ion batteries : synthesis and spectroscopic characterization of Li2(FeMnCo) SiO4 cathode materials

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Ferrari, Stefania , Mozzati, Maria Cristina, Lantieri, Marco, Spina, Gabriele, Capsoni, Doretta and Bini, Marcella (2016) New materials for Li-ion batteries : synthesis and spectroscopic characterization of Li2(FeMnCo) SiO4 cathode materials. Scientific Reports, 6 . 27896. doi:10.1038/srep27896 ISSN 2045-2322.

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Official URL: http://dx.doi.org/10.1038/srep27896

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Abstract

Improving cathode materials is mandatory for next-generation Li-ion batteries. Exploring polyanion compounds with high theoretical capacity such as the lithium metal orthosilicates, Li2MSiO4 is of great importance. In particular, mixed silicates represent an advancement with practical applications. Here we present results on a rapid solid state synthesis of mixed Li2(FeMnCo)SiO4 samples in a wide compositional range. The solid solution in the P21/n space group was found to be stable for high iron concentration or for a cobalt content up to about 0.3 atom per formula unit. Other compositions led to a mixture of polymorphs, namely Pmn21 and Pbn21. All the samples contained a variable amount of Fe3+ ions that was quantified by Mössbauer spectroscopy and confirmed by the TN values of the paramagnetic to antiferromagnetic transition. Preliminary characterization by cyclic voltammetry revealed the effect of Fe3+ on the electrochemical response. Further work is required to determine the impact of these electrode materials on lithium batteries.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Lithium ion batteries , Cathodes, Ions, Electrodes
Journal or Publication Title: Scientific Reports
Publisher: Nature Publishing Group
ISSN: 2045-2322
Official Date: 13 June 2016
Dates:
DateEvent
13 June 2016Published
26 May 2016Accepted
24 March 2016Submitted
Volume: 6
Article Number: 27896
DOI: 10.1038/srep27896
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 17 June 2016
Date of first compliant Open Access: 20 June 2016
Funder: Fondazione Cariplo [The Cariplo Foundation]
Grant number: Cariplo Project 2011–0325

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