Within this research the possibility of fluorine doping of the P2 type NaxCo02 powder was examined. As fluorine substitution already proved successful in improving cathode performance of layered lithium-based counterparts, the effects of fluorination on structure and electrochenlical properties ofP2 NaxCo02 were investigated and discussed

Jugović, Dragana

Milović, Miloš

Mitrić, Miodrag

Popović, Maja

Rakočević, Zlatko

Uskoković, Dragan

English

Serbian Academy of Science and Arts Digital Archive (DAIS)

VINCA INSTITUTE of NUCLEAR SCIENCES, UNIVERSITY of BELGRADEHYDROGEN STORAGE INITIATIVE SERBIAPROGRAMME AND THE BOOK OFABSTRACTS3rd International Symposium on Materials for Energy Storage andConversion - mESC-IS 2018Edited by:Nikola NovakovicSandra KurkoSanja Milosevic GovedarovicJasmina Grbovic NovakovicBook Title: 3rd International Symposium on Materials for Energy Storage and Conversion -mESC-IS 2018, Program and the Book of AbstractsPublishers:Vinca Institute ofNuclear Sciences, University of Belgrade, BelgradeHydrogen Economy Initiative Serbia, BelgradeFor Publishers:Dr. Milica Marceta KaninskiDr. Nikola NovakovicEditors:Dr. Nikola NovakovicDr. Sandra KurkoDr. Sanja Milosevi6 Govedarovi6Dr. Jasmina Grbovi6 Novakovi6Design:Dr. Nikola Novakovi6Technical editor:Dr. Bojana Paskas MamulaDr. Jelena Mili6evi6MSc. Tijana Panti6ISBN 978-86-7306-140-5Print: Knjigoveznica GRBOVIC, Belgrade: 100 copiesCopyright © 2018 by Vinca Institute of Nuclear Sciences and others contributors.All rights reserved. No part of this publication Inay be reproduced, in any form or by anymeans, without permission in writing from the publisher.mESC-IS 2018) 3rd Int SYlnposilHn on T\:1atcrials f{)r Energy Storage and ConversioiL Belgrade~ SerbiaCommittees & BoardsConference ChairJasmina Grbovic Novakovic, Vinca Institute, Belgrade, SerbiaConference Vice chair(s)Bojana Paskas Mamula, Vinca Institute, Belgrade, SerbiaSandra Kurko, Vinca Institute, Belgrade, SerbiaNikola Novakovic, Vinca Institute, Belgrade, SerbiaSanja Milosevic Govedarovic, Vinca Institute, Belgrade, SerbiaInternational Advisory BoardDag Noreus, Stockholm University, SwedenDaniel Fruchart, Neel Institute, Grenoble, FranceVolodymyr Yartys, Institute for Energy Technology, Kjeller, NorwayAmelia Montone, ENEA, Casaccia, ItalyPatricia de Rango, Neel Institute, Grenoble, FranceNataliya Skryabina, Perm State University, RussiaJose Ramon Ares Fernandez, Universidad Aut6noma de Madrid, SpainTayfur Oztiirk, Middle East Technical University, Ankara, TurkeyKadri Aydlnol Middle East Technical University, AnkaraRuth Imnadze, Tblisi State University, TbilisiSaban Patat, Erciyes University, KayseriSlavko Mentus, Faculty of Physical Chemistry, University of Belgrade, SerbiaScepan Miljanic, Faculty of Physical Chemistry, University of Belgrade, SerbiaJasmina Grbovic-Novakovic, Vinca Institute ofNuclear Sciences, BelgradeBranimir Banov, lEES, Bulgarian Academy of Sciences, Sofia, BulgariaFermin Cuevas, ICMPE/CNRS, Paris, FranceDarius Milcius, LEI, I(aunas, LithuaniaJunxian Zhang, ICMPE/CNRS, Paris, FranceMontse Casas-Cabanas, CIC Energigune, Alava, Spain4 n'ESC- IS 20 18~ .rel Int Synlposiun1 on ]\vlaterials for Energy Storage and Conversion, Bclgrade~ SerbiaProgram committeeTayfur Oztiirk, Middle East Technical University, Ankara, TurkeyAdam Revesz, Eotvos University, Budapest, HungaryDan Lupu, INCDTIM, Cluj-Napoca, RomaniaGeorgia Charalambopoulou, NCSR Demokritos, GreeceMiran Gaberscek, National Institute of Chemistry, Ljubljana, SloveniaNikola Biliskov, Ruder Boskovi6 Institute, Zagreb, CroatiaMaja Buljan, Ruder Boskovi6 Institute, Zagreb, CroatiaBranimir Banov, lEES, Bulgarian Academy of Sciences, Sofia, BulgariaTony Spassov, Faculty of Chemistry and Pharmacy, Sofia University, BulgariaPerica Paunovic, FTM, Skopje, MacedoniaSinisa Ignjatovic, UNIBL, Banja Luka, Bosnia and HerzegovinaDragana Jugovic, Inst Tech Sci SASA, Belgrade, SerbiaIvana Stojkovic Simatovic, Faculty of Physical Chemistry, University of Belgrade, SerbiaIgor Pasti, Faculty of Physical Chemistry, University of Belgrade, SerbiaNenad Ivanovic, Vinca Institute, Belgrade, SerbiaIvana Radisavljevic, Vinca Institute, Belgrade, SerbiaMilica Marceta Kaninski, Vinca Institute, Belgrade, SerbiaJasmina Grbovic Novakovic, Vinca Institute, Belgrade, SerbiaNikola Novakovic, Vinca Institute, Belgrade, SerbiaSandra Kurko, Vinca Institute, Belgrade, SerbiaOrganizing committeeBojana Paskas Mamula, Vinca Institute, Belgrade, SerbiaJelena Milicevic, Vinca Institute, Belgrade, SerbiaTijana Pantic, Vinca Institute, Belgrade, SerbiaSanja Milosevic Govedarovic, Vinca Institute, Belgrade, SerbiaJana Radakovic, Vinca Institute, Belgrade, SerbiaKatarina Batalovic, Vinca Institute, Belgrade, SerbiaIgor Milanovic, Ruder Boskovi6 Institute, Zagreb, Croatia,Vinca Institute, Belgrade, SerbiaAndjelka Djukic, Vinca Institute, Belgrade, SerbiaBojana Kuzmanovic, Vinca Institute, Belgrade, SerbiaMirjana Medic Ilic, Vinca Institute, Belgrade, SerbiaJelena Rmus, Vinca Institute, Belgrade, SerbiaZelj){o Mravik, Vinca Institute, Belgrade, Serbia---i;~~"'r~!l<:,")F.............. ~¥J::.,.M)(*' ~~¢Cf'_·.w···:f.~~h31geN>:~O-~t<"'I:l<!NCCst., ~t:)Cap>l<;.ity {mAh!91Figure 2. Galvanostatic charge/discharge profiles for pristine(upper graph) and fluorinated powder (lower graph).References[I] M. H. l-Ian, E. Gonzalo, G. Singh, T. Rojo EnergyEnviron. Sci. 8 (2015) 81-102.[2] L.W. Shacklette, T.R. JoV\, L. Townsend J. Electrochenl.Soc. 135 (1988) 2669-2674.%Cap<tcitvlmAtt/!J1The results of the Rietveld refinement combined with thefindings fi'onl the X-ray photoelectron spectroscopynleasurenlents confinn Na076Co02 and Na0.44C00196Foo4stoichionletries for the pristine and fluorinated powders,respectively, which inlplies that 4 at.°~ of fluorine ions perforn1ul a unit are incorporated in the structure. Fluorinationlnodifies the structure through both the reduction ofcrystall ite size and the increase of interslab distance.Consequently, fluorinated powder has showed theimprovelnent of the electrochemical perfonnances (Figure 2).has been conducted at 200°C in a vacuum evacuatedatmosphere vvith NH4HF2 as a fluorination agent. Theobtained samples were analysed by X-ray powder diffi'action,FTIR spectroscopy, FESEM electron microscopy, X-rayphotoelectron spectroscopy and Galvanostatic charge/discharge tests.oNa(2)Na(l)CoMilos D. Milovic was born in 1987 in Pristina, Serbia. He studied at the Faculty of Physical Chemistry, Universityof Belgrade. Currently, he is working as a research associate at the Institute of Technical Sciences of the SerbianAcademy of Sciences and Arts, Belgrade, Serbia. He holds a PhD in Physical Chemistry since 2016 and his field ofinterest covers chemical power sources with a focus on cathode materials for lithium ion batteries. The resultsof his research activities have been published in a number of peer-reviewed papers and presented at numerousscientific conferences.Corresponding author: Milos D. Milovic, e-mail: milos.milovic@itn.sanu.ac.rs tel: +38111 2636994Figure]. P2 structure of NaxCo02 .cl:alJ1ESC-IS 20] 8, 3rd Tnt. Synlposiunl on :vfatcrials for Energy Storage and Conversion, Belgrade. SerbiaFluorination of sodium cobalt oxide: effects on structure and electrochemicalperformanceMilos Milovic1---------------------1I II II II II II II II II II II II II II II II 1I I98Milos Milovic1, Dragana Jugovic2, Miodrag Mitric2, Maja Popovic2, Zlatko Rakocevic2 and DraganUskokovic 11 Institute of Technical Sciences of SASA, Belgrade2 Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, SerbiaA nlodified solid state reaction (an adopted nlethod thatincludes sequential cycles of rapid heating - at 750°C in theair with d\vell time of 15 nlinutes - and rapid cooling, with anintermediate grinding of the powder between two cycles) wasapplied for the preparation of a pristine NaxCo02 povvder.Na2C03 and C030 4 in a nlolar ratio 1.7 : 1 \vere used asstarting cOlnpounds. Fluorination of the synthesized NaxCo02Lower market cost of sodium in contrast to lithium lnakessodium intercalating compounds attractive for application aselectrodes in rechargeable sodium batteries. Among them,sodium cobalt oxide, NaxCo02, have been extensivelyinvestigated as potential cathode material for sodiunl ionbatteries [1]. NaxCo02 crystallizes in a nUlnber of layeredstructures depending on sodium content, oxygen partialpressure and temperature [2]. In each of these structures,edge-sharing Co06 octahedra form sheets between whichsodium ions are inserted with trigonal prisnlatic (P) oroctahedral (0) environment. The packing differs in thenunlber of sheets vvithin the uni t cell - 2 or 3 sheets -creating three possible structural types denoted as 03, P2,and P3. The P2 type of structure (displayed in Figure 1) isconsidered as the most suitable for electrochemicalapplication for its cycle stability.Within this research the possibility of fluorine doping of theP2 type NaxCo02 powder was examined. As fluorinesubstitution already proved successful in improving cathodeperformance of layered lithium-based counterparts, theeffects of fluorination on structure and electrochenlicalproperties ofP2 NaxCo02 were investigated and discussed.

Fluorination of sodium cobalt oxide: effects on structure and electrochemical performance

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Fluorination of sodium cobalt oxide: effects on structure and electrochemical performance

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