TU Darmstadt / ULB / TUbiblio

Li+intercalation in isostructural Li2VO3and Li2VO2F with O2−and mixed O2−/F−anions

Chen, Ruiyong and Ren, Shuhua and Yavuz, Murat and Guda, Alexander A. and Shapovalov, Viktor and Witter, Raiker and Fichtner, Maximilian and Hahn, Horst (2015):
Li+intercalation in isostructural Li2VO3and Li2VO2F with O2−and mixed O2−/F−anions.
In: Phys. Chem. Chem. Phys., 17 (26), The Royal Society of Chemistry, pp. 17288-17295, ISSN 1463-9076,
[Online-Edition: http://dx.doi.org/10.1039/c5cp02505b],
[Article]

Abstract

Mixed-anion materials for Li-ion batteries have been attracting attention in view of their tunable electrochemical properties. Herein, we compare two isostructural (Fm (3) over barm) model intercalation materials Li2VO3 and Li2VO2F with O2- and mixed O2-/F- anions, respectively. Synchrotron X-ray diffraction and pair distribution function data confirm large structural similarity over long-range and at the atomic scale for these materials. However, they show distinct electrochemical properties and kinetic behaviour arising from the different anion environments and the consequent difference in cationic electrostatic repulsion. In comparison with Li2VO3 with an active V4+/5+ redox reaction, the material Li2VO2F with oxofluoro anions and the partial activity of V3+/5+ redox reaction favor higher theoretical capacity (460 mA h g(-1) vs. 230 mA h g(-1)), higher voltage (2.5 V vs. 2.2 V), lower polarization (0.1 V vs. 0.3 V) and faster Li+ chemical diffusion (similar to 10(-9) cm(2) s(-1) vs. similar to 10(-11) cm(2) s(-1)). This work not only provides insights into the understanding of anion chemistry, but also suggests the rational design of new mixed-anion battery materials.

Item Type: Article
Erschienen: 2015
Creators: Chen, Ruiyong and Ren, Shuhua and Yavuz, Murat and Guda, Alexander A. and Shapovalov, Viktor and Witter, Raiker and Fichtner, Maximilian and Hahn, Horst
Title: Li+intercalation in isostructural Li2VO3and Li2VO2F with O2−and mixed O2−/F−anions
Language: English
Abstract:

Mixed-anion materials for Li-ion batteries have been attracting attention in view of their tunable electrochemical properties. Herein, we compare two isostructural (Fm (3) over barm) model intercalation materials Li2VO3 and Li2VO2F with O2- and mixed O2-/F- anions, respectively. Synchrotron X-ray diffraction and pair distribution function data confirm large structural similarity over long-range and at the atomic scale for these materials. However, they show distinct electrochemical properties and kinetic behaviour arising from the different anion environments and the consequent difference in cationic electrostatic repulsion. In comparison with Li2VO3 with an active V4+/5+ redox reaction, the material Li2VO2F with oxofluoro anions and the partial activity of V3+/5+ redox reaction favor higher theoretical capacity (460 mA h g(-1) vs. 230 mA h g(-1)), higher voltage (2.5 V vs. 2.2 V), lower polarization (0.1 V vs. 0.3 V) and faster Li+ chemical diffusion (similar to 10(-9) cm(2) s(-1) vs. similar to 10(-11) cm(2) s(-1)). This work not only provides insights into the understanding of anion chemistry, but also suggests the rational design of new mixed-anion battery materials.

Journal or Publication Title: Phys. Chem. Chem. Phys.
Volume: 17
Number: 26
Publisher: The Royal Society of Chemistry
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 10 Feb 2016 09:30
Official URL: http://dx.doi.org/10.1039/c5cp02505b
Identification Number: doi:10.1039/c5cp02505b
Funders: A.G. would like to thank support from Russian Ministry of Education and Science (MK-3206.2014.2)., R.W. thanks the EU Fund, Estonian Research Council, TUT and KBFI (MTT68, SF0690034s09, B618 and PUT126).
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)

View Item View Item