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Na2CoSiO4as a cathode material for sodium-ion batteries : structure, electrochemistry and diffusion pathways
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Treacher, Joshua C., Wood, Stephen M., Islam, M. Saiful and Kendrick, Emma (2016) Na2CoSiO4as a cathode material for sodium-ion batteries : structure, electrochemistry and diffusion pathways. Physical Chemistry Chemical Physics, 18 (48). pp. 32744-32752. doi:10.1039/C6CP06777H ISSN 1463-9076.
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Official URL: http://dx.doi.org/10.1039/C6CP06777H
Abstract
The importance of developing new low-cost and safe cathodes for large-scale sodium batteries has led to recent interest in silicate compounds. A novel cobalt orthosilicate, Na2CoSiO4, shows promise as a high voltage (3.3 V vs. Na/Na+) cathode material for sodium-ion batteries. Here, the synthesis and room temperature electrochemical performance of Na2CoSiO4 have been investigated with the compound found to yield a reversible capacity greater than 100 mA h gā1 at a rate of 5 mA gā1. Insights into the crystal structures of Na2CoSiO4 were obtained through refinement of structural models for its two polymorphs, Pn and Pbca. Atomistic modelling results indicate that intrinsic defect levels are not significant and that Na+ diffusion follows 3D pathways with low activation barriers, which suggest favourable electrode kinetics. The new findings presented here provide a platform on which future optimisation of Na2CoSiO4 as a cathode for Na-ion batteries can be based.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||
Journal or Publication Title: | Physical Chemistry Chemical Physics | ||||||
Publisher: | Royal Society of Chemistry | ||||||
ISSN: | 1463-9076 | ||||||
Official Date: | 16 November 2016 | ||||||
Dates: |
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Volume: | 18 | ||||||
Number: | 48 | ||||||
Page Range: | pp. 32744-32752 | ||||||
DOI: | 10.1039/C6CP06777H | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access |
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