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Vanadium Oxyfluoride/Few-Layer Graphene Composite as a High-Performance Cathode Material for Lithium Batteries

Musa Ali Cambaz, B. P. Vinayan, Oliver Clemens, Anji Munnangi Orcid Logo, Venkata Sai Kiran Chakravadhanula, Christian Kübel, Maximilian Fichtner

Inorganic Chemistry, Volume: 55, Issue: 8, Pages: 3789 - 3796

Swansea University Author: Anji Munnangi Orcid Logo

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DOI (Published version): 10.1021/acs.inorgchem.5b02687

Abstract

Metal oxyfluoride compounds are gathering significant interest as cathode materials for lithium ion batteries at the moment because of their high theoretical capacity and resulting high energy density. In this regard, a new and direct approach is presented to synthesize phase-pure vanadium oxyfluori...

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Published in: Inorganic Chemistry
ISSN: 0020-1669 1520-510X
Published: 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa51580
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spelling 2019-09-04T11:52:35.8913826 v2 51580 2019-08-27 Vanadium Oxyfluoride/Few-Layer Graphene Composite as a High-Performance Cathode Material for Lithium Batteries 3ed0b4f2ff4fb9e87c7a73e7a3c39da7 0000-0001-9101-0252 Anji Munnangi Anji Munnangi true false 2019-08-27 MTLS Metal oxyfluoride compounds are gathering significant interest as cathode materials for lithium ion batteries at the moment because of their high theoretical capacity and resulting high energy density. In this regard, a new and direct approach is presented to synthesize phase-pure vanadium oxyfluoride (VO2F). The structure of VO2F was identified by Rietveld refinement of the powder X-ray diffraction (XRD) pattern. It crystallizes in a perovskite-type structure with disorder of the oxide and fluoride ions. The as-synthesized VO2F was tested as a cathode material for lithium ion batteries after being surface-coated with few-layer graphene. The VO2F delivered a first discharge capacity of 254 mA h g–1 and a reversible capacity of 208 mA h g–1 at a rate of C/20 for the first 20 cycles with an average discharge voltage of 2.84 V, yielding an energy density of 591 W h kg–1. Improved rate capability that outperforms the previous report has been achieved, showing a discharge capacity of 150 mA h g–1 for 1 C. The structural changes during lithium insertion and extraction were monitored by ex-situ XRD analysis of the electrodes discharged and charged to various stages. Lithium insertion results in an irreversible structural change of the anion lattice from 3/4 cubic close packing to hexagonal close packing to accommodate the inserted lithium ions while keeping the overall space-group symmetry. For the first time we have revealed a structural change for the ReO3-type structure of as-prepared VO2F to the RhF3 structure after lithiation/delithiation, with structural changes that have not been observed in previous reports. Furthermore, the new synthetic approach described here would be a platform for the synthesis of new oxyfluoride compounds. Journal Article Inorganic Chemistry 55 8 3789 3796 0020-1669 1520-510X 18 4 2016 2016-04-18 10.1021/acs.inorgchem.5b02687 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2019-09-04T11:52:35.8913826 2019-08-27T12:25:56.8541055 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Musa Ali Cambaz 1 B. P. Vinayan 2 Oliver Clemens 3 Anji Munnangi 0000-0001-9101-0252 4 Venkata Sai Kiran Chakravadhanula 5 Christian Kübel 6 Maximilian Fichtner 7
title Vanadium Oxyfluoride/Few-Layer Graphene Composite as a High-Performance Cathode Material for Lithium Batteries
spellingShingle Vanadium Oxyfluoride/Few-Layer Graphene Composite as a High-Performance Cathode Material for Lithium Batteries
Anji Munnangi
title_short Vanadium Oxyfluoride/Few-Layer Graphene Composite as a High-Performance Cathode Material for Lithium Batteries
title_full Vanadium Oxyfluoride/Few-Layer Graphene Composite as a High-Performance Cathode Material for Lithium Batteries
title_fullStr Vanadium Oxyfluoride/Few-Layer Graphene Composite as a High-Performance Cathode Material for Lithium Batteries
title_full_unstemmed Vanadium Oxyfluoride/Few-Layer Graphene Composite as a High-Performance Cathode Material for Lithium Batteries
title_sort Vanadium Oxyfluoride/Few-Layer Graphene Composite as a High-Performance Cathode Material for Lithium Batteries
author_id_str_mv 3ed0b4f2ff4fb9e87c7a73e7a3c39da7
author_id_fullname_str_mv 3ed0b4f2ff4fb9e87c7a73e7a3c39da7_***_Anji Munnangi
author Anji Munnangi
author2 Musa Ali Cambaz
B. P. Vinayan
Oliver Clemens
Anji Munnangi
Venkata Sai Kiran Chakravadhanula
Christian Kübel
Maximilian Fichtner
format Journal article
container_title Inorganic Chemistry
container_volume 55
container_issue 8
container_start_page 3789
publishDate 2016
institution Swansea University
issn 0020-1669
1520-510X
doi_str_mv 10.1021/acs.inorgchem.5b02687
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 0
active_str 0
description Metal oxyfluoride compounds are gathering significant interest as cathode materials for lithium ion batteries at the moment because of their high theoretical capacity and resulting high energy density. In this regard, a new and direct approach is presented to synthesize phase-pure vanadium oxyfluoride (VO2F). The structure of VO2F was identified by Rietveld refinement of the powder X-ray diffraction (XRD) pattern. It crystallizes in a perovskite-type structure with disorder of the oxide and fluoride ions. The as-synthesized VO2F was tested as a cathode material for lithium ion batteries after being surface-coated with few-layer graphene. The VO2F delivered a first discharge capacity of 254 mA h g–1 and a reversible capacity of 208 mA h g–1 at a rate of C/20 for the first 20 cycles with an average discharge voltage of 2.84 V, yielding an energy density of 591 W h kg–1. Improved rate capability that outperforms the previous report has been achieved, showing a discharge capacity of 150 mA h g–1 for 1 C. The structural changes during lithium insertion and extraction were monitored by ex-situ XRD analysis of the electrodes discharged and charged to various stages. Lithium insertion results in an irreversible structural change of the anion lattice from 3/4 cubic close packing to hexagonal close packing to accommodate the inserted lithium ions while keeping the overall space-group symmetry. For the first time we have revealed a structural change for the ReO3-type structure of as-prepared VO2F to the RhF3 structure after lithiation/delithiation, with structural changes that have not been observed in previous reports. Furthermore, the new synthetic approach described here would be a platform for the synthesis of new oxyfluoride compounds.
published_date 2016-04-18T04:03:31Z
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