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Mihali, Viorica Alina
Alternative names
Publications (10 of 10) Show all publications
Renault, S., Oltean, V. A., Ebadi, M., Edström, K. & Brandell, D. (2017). Dilithium 2-aminoterephthalate as a negative electrode material for lithium-ion batteries. Solid State Ionics, 307, 1-5
Open this publication in new window or tab >>Dilithium 2-aminoterephthalate as a negative electrode material for lithium-ion batteries
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2017 (English)In: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 307, p. 1-5Article in journal (Refereed) Published
Abstract [en]

This work presents the synthesis and characterization of a novel organic Li-battery anode material: dilithium 2-aminoterephthalate (C8H5Li2NO4). When investigated in Li half-cells, the resulting electrodes show stable capacities around ca. 180 mAh g− 1 and promising rate capabilities, with battery performance at 500 mA g− 1 and good capacity recovery, despite being an asymmetric compound. DFT calculations indicate a preferential lithiation on carboxylates close to the amino group.

National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-336695 (URN)10.1016/j.ssi.2017.05.005 (DOI)000405051700001 ()
Funder
Swedish Research Council Formas, 2016-00838Swedish Energy Agency, 39036-1Carl Tryggers foundation Swedish Foundation for Strategic Research
Available from: 2017-12-15 Created: 2017-12-15 Last updated: 2018-09-04Bibliographically approved
Oltean, V. A., Renault, S. & Brandell, D. (2016). Enhanced performance of organic materials for lithium-ion batteries using facile electrode calendaring techniques. Electrochemistry communications, 68, 45-48
Open this publication in new window or tab >>Enhanced performance of organic materials for lithium-ion batteries using facile electrode calendaring techniques
2016 (English)In: Electrochemistry communications, ISSN 1388-2481, E-ISSN 1873-1902, Vol. 68, p. 45-48Article in journal (Refereed) Published
Abstract [en]

A simple and convenient strategy for achieving higher capacities in organic electrode materials used in pouch-cell format is presented here. By calendaring of the electrodes, the resulting electrode porosity can be tailored. It is shown for carboxylate electrodes of dilithium benzenediacrylate that a 30% porosity constitutes the best compromise between electronic wiring, particle contact and electrolyte infiltration into the electrodes, displaying higher capacities than in Swagelock cells.

Keywords
Li-batteries, Organic electrodes, Pouch cell, Calendaring, Capacity retention
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:uu:diva-300543 (URN)10.1016/j.elecom.2016.04.014 (DOI)000379277300011 ()
Funder
Swedish Foundation for Strategic Research Carl Tryggers foundation
Available from: 2016-08-10 Created: 2016-08-09 Last updated: 2018-04-04Bibliographically approved
Renault, S., Oltean, V. A., Araujo, C. M., Grigoriev, A., Edström, K. & Brandell, D. (2016). Superlithiation of Organic Electrode Materials: The Case of Dilithium Benzenedipropiolate. Chemistry of Materials, 28(6), 1920-1926
Open this publication in new window or tab >>Superlithiation of Organic Electrode Materials: The Case of Dilithium Benzenedipropiolate
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2016 (English)In: Chemistry of Materials, Vol. 28, no 6, p. 1920-1926Article in journal (Refereed) Published
Abstract [en]

Dilithium benzenedipropiolate was prepared and investigated as a potential negative electrode material for secondary lithium-ion batteries. In addition to the expected reduction of its carbonyls, this material can reduce and reversibly oxidize its unsaturated carbon–carbon bonds leading to a Li/C ratio of 1/1 and a specific capacity as high as 1363 mAh g–1: the highest ever reported for a lithium carboxylate. Density functional theory calculations suggest that the lithiation is preferential on the propiolate carbons.

National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-283396 (URN)10.1021/acs.chemmater.6b00267 (DOI)000372856600038 ()
Funder
StandUpSwedish Foundation for Strategic Research
Available from: 2016-04-12 Created: 2016-04-12 Last updated: 2017-12-30
Oltean, V.-A., Renault, S., Valvo, M. & Brandell, D. (2016). Sustainable Materials for Sustainable Energy Storage: Organic Na Electrodes. Materials, 9(3), Article ID 142.
Open this publication in new window or tab >>Sustainable Materials for Sustainable Energy Storage: Organic Na Electrodes
2016 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 9, no 3, article id 142Article, review/survey (Refereed) Published
Abstract [en]

In this review, we summarize research efforts to realize Na-based organic materials for novel battery chemistries. Na is a more abundant element than Li, thereby contributing to less costly materials with limited to no geopolitical constraints while organic electrode materials harvested from biomass resources provide the possibility of achieving renewable battery components with low environmental impact during processing and recycling. Together, this can form the basis for truly sustainable electrochemical energy storage. We explore the efforts made on electrode materials of organic salts, primarily carbonyl compounds but also Schiff bases, unsaturated compounds, nitroxides and polymers. Moreover, sodiated carbonaceous materials derived from biomasses and waste products are surveyed. As a conclusion to the review, some shortcomings of the currently investigated materials are highlighted together with the major limitations for future development in this field. Finally, routes to move forward in this direction are suggested.

Keywords
Na-ion battery, organic electrode material, disordered carbons, renewable materials
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-299174 (URN)10.3390/ma9030142 (DOI)000373805400013 ()
Funder
Swedish Foundation for Strategic Research Carl Tryggers foundation
Available from: 2016-07-15 Created: 2016-07-15 Last updated: 2017-11-28
Oltean, A. (2015). Organic Negative Electrode Materials For Li-ion and Na-ion Batteries. (Licentiate dissertation). Uppsala: Kph Trycksaksbolaget AB
Open this publication in new window or tab >>Organic Negative Electrode Materials For Li-ion and Na-ion Batteries
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Uppsala: Kph Trycksaksbolaget AB, 2015. p. 43
Keywords
organic materials, Li-ion batteries, Na-ion batteries
National Category
Chemical Sciences
Research subject
Chemistry with specialization in Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-243273 (URN)
Presentation
2015-02-27, Beurlingrummet, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2015-02-11 Created: 2015-02-06 Last updated: 2015-02-11Bibliographically approved
Mihali, V. A., Renault, S., Nyholm, L. & Brandell, D. (2014). Benzenediacrylates as organic battery electrode materials: Na versus Li. RSC Advances, 4(72), 38004-38011
Open this publication in new window or tab >>Benzenediacrylates as organic battery electrode materials: Na versus Li
2014 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 4, no 72, p. 38004-38011Article in journal (Refereed) Published
Abstract [en]

This paper discusses investigations of a novel Na-based organic battery electrode material, disodium benzenediacrylate (Na(2)BDA) in comparison with its Li-ion homologue. Li(2)BDA has previously shown promising battery properties, such as stable cycling and good capacity retention. Na(2)BDA and Li(2)BDA are here successfully synthesized and characterized, and investigated as anode materials in prototype Na- and Li-ion battery cells. Moreover, different electrolytes are screened for the Na-battery material, and a useful operating voltage window is explored. Na(2)BDA is shown to possess a higher initial coulombic efficiency (91%) than the Li-homologue, which is uncommon for sodiated organic electrode materials. The Na-compound shows an initial capacity of 177.7 mA h g(-1), which however decreases to ca. 50 mA h g(-1) after 20-100 cycles depending on the cycling rate; a significantly lower capacity retention then that observed for Li(2)BDA. The capacity loss can primarily be explained by a decomposition mechanism of the Na(2)BDA compound.

National Category
Chemical Sciences
Identifiers
urn:nbn:se:uu:diva-233622 (URN)10.1039/c4ra06288d (DOI)000341455200008 ()
Available from: 2014-10-07 Created: 2014-10-07 Last updated: 2018-04-04Bibliographically approved
Yang, L., Mihali, V.-A., Karlsson, C., Sjödin, M., Strömme, M. & Brandell, D. (2014). Conjugated polymers as anodes in organic matter based batteries. In: : . Paper presented at 247th National Spring Meeting of the American-Chemical-Society (ACS), MAR 16-20, 2014, Dallas, TX. , 247
Open this publication in new window or tab >>Conjugated polymers as anodes in organic matter based batteries
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2014 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Other Chemistry Topics Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-247740 (URN)000348457600045 ()
Conference
247th National Spring Meeting of the American-Chemical-Society (ACS), MAR 16-20, 2014, Dallas, TX
Available from: 2015-03-23 Created: 2015-03-23 Last updated: 2016-11-30
Renault, S., Mihali, V. A., Edström, K. & Brandell, D. (2014). Stability of organic Na-ion battery electrode materials: The case of disodium pyromellitic diimidate. Electrochemistry communications, 45, 52-55
Open this publication in new window or tab >>Stability of organic Na-ion battery electrode materials: The case of disodium pyromellitic diimidate
2014 (English)In: Electrochemistry communications, ISSN 1388-2481, E-ISSN 1873-1902, Vol. 45, p. 52-55Article in journal (Refereed) Published
Abstract [en]

A novel organic Na-salt is presented here for utilization as an active electrode material in rechargeable Na-ion batteries. The compound, disodium pyromellitic diimidate, is synthesized through a reaction by pyromellitic acid and sodium hydride and characterized using H-1-NMR. Na-batteries of the organic compound were able to obtain capacity values close to the theoretical during the first cycles, but a steady capacity decrease could be observed during cycling. The battery nevertheless delivered a capacity of ca 90 mAh/g after 100 cycles, rendering it a comparatively competitive organic Na-battery material. However, the results stress the importance of tailoring Na-compounds with a good chemical stability also at high levels of sodiation, since decomposition side-reactions can be probable. 

Keywords
Na-ion batteries, Organic electrode materials, N-cyclic structures, Pyromellitic diimidate
National Category
Chemical Sciences
Identifiers
urn:nbn:se:uu:diva-230068 (URN)10.1016/j.elecom.2014.05.012 (DOI)000339035700013 ()
Funder
StandUp
Available from: 2014-09-03 Created: 2014-08-19 Last updated: 2017-12-30
Renault, S., Mihali, V. A. & Brandell, D. (2013). Optimizing the electrochemical performance of water-soluble organic Li-ion battery electrodes. Electrochemistry communications, 34, 174-176
Open this publication in new window or tab >>Optimizing the electrochemical performance of water-soluble organic Li-ion battery electrodes
2013 (English)In: Electrochemistry communications, ISSN 1388-2481, E-ISSN 1873-1902, Vol. 34, p. 174-176Article in journal (Refereed) Published
Abstract [en]

A method for improving the electrode formulation of organic Li-ion battery active materials is reported here. By combining freeze-drying and carbon-coating in the liquid state, an improved morphology of the electrode and the material can be achieved. The carbon content proved to be vital for the electrochemical performance due to its high dispersion when the active material particle size decreases. Reasonable capacity (>150 mAh/g) was shown for dilithium benzenediacrylate at 2C during 50 cycles. 

Keywords
Lithium-ion batteries, Organic electrodes, Electrode formulation, Freeze-drying
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-210245 (URN)10.1016/j.elecom.2013.06.008 (DOI)000324963900044 ()
Available from: 2013-11-05 Created: 2013-11-04 Last updated: 2018-04-04Bibliographically approved
Arkhypchuk, A. I., Orthaber, A., Mihali, V. A., Ehlers, A., Lammertsma, K. & Ott, S. (2013). Oxaphospholes and Bisphospholes from Phosphinophosphonates and alpha,beta-Unsaturated Ketones. Chemistry - A European Journal, 19(41), 13692-13704
Open this publication in new window or tab >>Oxaphospholes and Bisphospholes from Phosphinophosphonates and alpha,beta-Unsaturated Ketones
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2013 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 19, no 41, p. 13692-13704Article in journal (Refereed) Published
Abstract [en]

The reaction of a {W(CO)(5)}-stabilized phosphinophosphonate 1, (CO)(5)WPH(Ph)P(O)(OEt)(2), with ethynyl- (2a-f) and diethynylketones (7-11, 18, and 19) in the presence of lithium diisopropylamide (LDA) is examined. Lithiated 1 undergoes nucleophilic attack in the Michael position of the acetylenic ketones, as long as this position is not sterically encumbered by bulky (iPr)(3)Si substituents. Reaction of all other monoacetylenic ketones with lithiated 1 results in the formation of 2,5-dihydro-1,2-oxaphospholes 3 and 4. When diacetylenic ketones are employed in the reaction, two very different product types can be isolated. If at least one (Me)(3)Si or (Et)(3)Si acetylene terminus is present, as in 7, 8, and 19, an anionic oxaphosphole intermediate can react further with a second equivalent of ketone to give cumulene-decorated oxaphospholes 14, 15, 24, and 25. Diacetylenic ketones 10 and 11, with two aromatic acetylene substituents, react with lithitated 1 to form exclusively ethenyl-bridged bisphospholes 16 and 17. Mechanisms that rationalize the formation of all heterocycles are presented and are supported by DFT calculations. Computational studies suggest that thermodynamic, as well as kinetic, considerations dictate the observed reactivity. The calculated reaction pathways reveal a number of almost isoenergetic intermediates that follow after ring opening of the initially formed oxadiphosphetane. Bisphosphole formation through a carbene intermediate G is greatly favored in the presence of phenyl substituents, whereas the formation of cumulene-decorated oxaphospholes is more exothermic for the trimethylsilyl-containing substrates. The pathway to the latter compounds contains a 1,3-shift of the group that stems from the acetylene terminus of the ketone substrates. For silyl substituents, the 1,3-shift proceeds along a smooth potential energy surface through a transition state that is characterized by a pentacoordinated silicon center. In contrast, a high-lying transition state TS(E-F)(R=Ph) of 37kcalmol(-1) is found when the substituent is a phenyl group, thus explaining the experimental observation that aryl-terminated diethynylketones 10 and 11 exclusively form bisphospholes 16 and 17.

Keywords
cumulenes, density functional calculations, domino reactions, phosphaorganic chemistry, reaction mechanisms
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-210179 (URN)10.1002/chem.201302014 (DOI)000325135800015 ()
Available from: 2013-11-04 Created: 2013-11-04 Last updated: 2017-12-06Bibliographically approved
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