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dc.creatorMilović, Miloš
dc.creatorJugović, Dragana
dc.creatorMitrić, Miodrag
dc.creatorKuzmanović, Maja
dc.creatorVujković, Milica
dc.creatorUskoković, Dragan
dc.date.accessioned2020-01-14T11:18:29Z
dc.date.available2020-01-14T11:18:29Z
dc.date.issued2019
dc.identifier.urihttp://dais.sanu.ac.rs/123456789/7047
dc.description.abstractSince Padhi et al. reported the electrochemical properties of LiFePO4 in 1997 [1], polyanion cathode materials for lithium-ion batteries attract interest of researchers because of the added safety and higher voltage values in comparison to the oxide analogues with the same M2+/3+ redox pair. The higher safety and higher voltage come from strong covalent bonding within the polyanion units and, over the years, these inherent characteristics have promoted the investigation of different polyanion compounds. Among them, lithium transition-metal silicates, Li2MSiO4, and pyrophosphates, Li2MP2O7, additionally offer the possibility of extraction/ insertion two lithium ions per formula unit thus increasing theoretical capacity. However, unlike their oxide counterparts, polyanion cathodes suffer considerably from low conductivity (both ionic and electronic) which significantly limits their rate performance and therefore application in high power devices. To overcome this obstacle various strategies were developed like minimization of particle size, addition of conductive additives and/or ion doping. In this study, the approach that was used includes preparation of Li2FeSiO4/C, LiFePO4/C a nd L i2FeP2O7/C composites where carbon is obtained by pyrolytical degradation of methylcellulose and in situ during formation of polyanion active material on high temperatures. Methylcellulose, or methyl cellulose ether, is a water-soluble derivative of cellulose with an ability to gel upon heating and reversibly liquefy upon cooling due to the hydrophobic interaction between molecules containing methoxyl groups [2]. Thanks to this outstanding ability, the methylcellulose acts not only as a carbon source, but also as a dispersing agent that enables both the homogeneous deployment of the precursor compounds and the control of active material’ particle growth from the earliest stages of crystallization. This further allowed a significant shortening of high temperature treatment (to several minutes long) with additional decreases of particle agglomeration. Being both simple and inexpensive, the described method is also beneficial for commercial purposes. The electrochemical and microstructural properties of the obtained powders were examined and compared. Also, the opportunity is taken to discuss potential of a redox couple Fe2+/Fe3+ (Figure 1) in a relation to the crystal structure of a given polyanion cathode.en
dc.language.isoensr
dc.publisher[s.l.] : [s.n.]sr
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45004/RS//sr
dc.rightsopenAccesssr
dc.sourceAbstracts/Proceedings / mESC-IS 2019 : The Fourth International Symposium on Materials for Energy Storage and Conversion, 7-11 September 2019, Akyaka –Muğlasr
dc.subjectmethylcellulosesr
dc.subjectLi2FeSiO4/Csr
dc.subjectLi2FeP2O7/Csr
dc.subjectLiFePO4/Csr
dc.subjectelectrochemisrtrysr
dc.subjectpolyanion cathode materialssr
dc.subjectcomposite materialssr
dc.titleSynthesis of cathode composite powders from methylcellulose matrix: Li2FeSiO4/C, Li2FeP2O7/C and LiFePO4/Cen
dc.typeconferenceObjectsr
dc.rights.licenseBY-NC-NDsr
dcterms.abstractУскоковић, Драган; Миловић, Милош; Митрић, Миодраг; Вујковић, Милица; Кузмановић, Маја; Југовић, Драгана;
dc.citation.spage42
dc.citation.epage42
dc.type.versionpublishedVersionsr
dc.identifier.fulltexthttp://dais.sanu.ac.rs/bitstream/id/27941/bitstream_27941.pdf


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