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Liivat, Anti
Publications (10 of 33) Show all publications
Liivat, A. (2017). High  energy density battery materials – understanding their endurance with the help of modelling. In: : . Paper presented at E-mobility Center Day, 15 June 2017, Stockholm, Sweden (Swedish Electromobility Centre partners). .
Open this publication in new window or tab >>High  energy density battery materials – understanding their endurance with the help of modelling
2017 (English)Conference paper, Oral presentation only (Other academic)
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-338219 (URN)
Conference
E-mobility Center Day, 15 June 2017, Stockholm, Sweden (Swedish Electromobility Centre partners)
Funder
Swedish Energy Agency, P30528-3
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-01-08
Liivat, A. (2017). In situ Mössbauer studies of the electrochemistry in symmetric cells. In: : . Paper presented at Nordbatt, 1-3 November 2017, Kokkola, Finland. .
Open this publication in new window or tab >>In situ Mössbauer studies of the electrochemistry in symmetric cells
2017 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-338196 (URN)
Conference
Nordbatt, 1-3 November 2017, Kokkola, Finland
Funder
Swedish Research Council, 2010-4824VINNOVA, 2012-02525Swedish Energy Agency, P36015-1
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-01-11Bibliographically approved
Valvo, M., Liivat, A., Eriksson, H., Tai, C.-W. & Edström, K. (2017). Iron-Based Electrodes Meet Water-Based Preparation, Fluorine-Free Electrolyte and Binder: A Chance for More Sustainable Lithium-Ion Batteries?. ChemSusChem, 10(11), 2431-2448.
Open this publication in new window or tab >>Iron-Based Electrodes Meet Water-Based Preparation, Fluorine-Free Electrolyte and Binder: A Chance for More Sustainable Lithium-Ion Batteries?
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2017 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 10, no 11, p. 2431-2448Article in journal (Refereed) Published
Abstract [en]

Environmentally friendly and cost-effective Li-ion cells are fabricated with abundant, non-toxic LiFePO4 cathodes and iron oxide anodes. A water-soluble alginate binder is used to coat both electrodes to reduce the environmental footprint. The critical reactivity of LiPF6-based electrolytes toward possible traces of H2O in water-processed electrodes is overcome by using a lithium bis(oxalato) borate (LiBOB) salt. The absence of fluorine in the electrolyte and binder is a cornerstone for improved cell chemistry and results in stable battery operation. A dedicated approach to exploit conversion-type anodes more effectively is also disclosed. The issue of large voltage hysteresis upon conversion/de-conversion is circumvented by operating iron oxide in a deeply lithiated Fe/Li2O form. Li-ion cells with energy efficiencies of up to 92% are demonstrated if LiFePO4 is cycled versus such anodes prepared through a prelithiation procedure. These cells show an average energy efficiency of approximately 90.66% and a mean Coulombic efficiency of approximately 99.65% over 320 cycles at current densities of 0.1, 0.2 and 0.3 mAcm(-2). They retain nearly 100% of their initial discharge capacity and provide an unmatched operation potential of approximately 2.85 V for this combination of active materials. No occurrence of Li plating was detected in three-electrode cells at charging rates of approximately 5C. Excellent rate capabilities of up to approximately 30C are achieved thanks to the exploitation of size effects from the small Fe nanoparticles and their reactive boundaries.

Keyword
batteries, electrolytes, energy storage, iron oxide, pseudocapacitance
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-327376 (URN)10.1002/cssc.201700070 (DOI)000403005900016 ()
Funder
Swedish Research Council Formas, 245-2014-668
Available from: 2017-08-10 Created: 2017-08-10 Last updated: 2017-08-10Bibliographically approved
Liivat, A., Thomas, J., Guo, J. & Yang, Y. (2017). Novel insights into higher capacity from the Li-ion battery cathode material Li2FeSiO4. Electrochimica Acta, 223, 109-114.
Open this publication in new window or tab >>Novel insights into higher capacity from the Li-ion battery cathode material Li2FeSiO4
2017 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 223, p. 109-114Article in journal (Refereed) Published
Abstract [en]

A highly reactive composite cathode material incorporating nano-particles of the popular Li-ion battery cathode material Li2FeSiO4 (LFS) is here studied to probe the activation of the controversial Fe3+/Fe4+ redox couple in exploiting the second Li-ion in the formula unit - for use in rechargeable Li-ion batteries. A novel form of in situ Mossbauer spectroscopy is used to monitor the oxidation state of the Fe-ions in symmetric LFS LFS cells. This is based on mapping the poorly resolvable Mossbauer spectra from the expected Fe3+/Fe4+ redox couple in the working electrode onto the highly resolvable Fe2+/Fe3+ spectra from the counter electrode. Comparison of such data from half-delithiated Li(1)Fe3+SiO4 parallel to Li(1)Fe3+SiO4 and almost lithium-free "Li(0)Fe4+SiO4 parallel to Li(0)Fe4+SiO4" symmetric cells is demonstrated - to distinguish the electrode reactions from the those involving the electrolyte. Lithium is shown to cycle reversibly in the symmetric cells. However, a large proportion of the cycled lithium (similar to 70%) does not derive from the bulk of the electrodes, but is rather a result of high-V electrolyte degradation, where charge balance is maintained by leaching lithium from the electrolyte and inserting it into the electrodes.

Keyword
Lithium-ion batteries, positive electrode, Li2FeSiO4, in situ Mossbauer spectroscopy, Fe4+
National Category
Chemical Sciences
Identifiers
urn:nbn:se:uu:diva-316422 (URN)10.1016/j.electacta.2016.12.008 (DOI)000392773100012 ()
Available from: 2017-03-01 Created: 2017-03-01 Last updated: 2017-11-29Bibliographically approved
Edström, K., Gustafsson, T., Aktekin, B., Nordh, T., Lacey, M. & Liivat, A. (2017). Reach MAX: Reach maximum volymetric capacity for lithium batteries with high voltage cathodes. In: : . Paper presented at Energirelaterad fordonsforskning 2017, Enrgimyndigheten (Swedish Energy Agency). .
Open this publication in new window or tab >>Reach MAX: Reach maximum volymetric capacity for lithium batteries with high voltage cathodes
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2017 (English)Conference paper, Oral presentation only (Other academic)
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-338172 (URN)
Conference
Energirelaterad fordonsforskning 2017, Enrgimyndigheten (Swedish Energy Agency)
Projects
ReachMAX
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-01-11Bibliographically approved
Valvo, M., Liivat, A., Eriksson, H., Tai, C.-W. & Edström, K. (2017). Towards more environmentally friendly iron-based Li-ion batteries. In: : . Paper presented at Nordbatt 2017 - 3rd Nordic Battery Conference, 1-3 November 2017, Kokkola, Finland. .
Open this publication in new window or tab >>Towards more environmentally friendly iron-based Li-ion batteries
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2017 (English)Conference paper, Oral presentation with published abstract (Other academic)
Keyword
Iron oxide, Pseudocapacitance, Fluorine-free electrolyte, LiFePO4, Sodium Alginate
National Category
Materials Chemistry
Research subject
Chemistry with specialization in Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-337930 (URN)
Conference
Nordbatt 2017 - 3rd Nordic Battery Conference, 1-3 November 2017, Kokkola, Finland
Funder
Swedish Research Council Formas, 245-2014-668
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-01-11Bibliographically approved
Kocak, T., Jeschull, F., Valvo, M., Liivat, A. & Turan, S. (2016). Alternative binders for lithium iron silicate (Li2FeSiO4) cathodes. In: : . Paper presented at International Battery Association (IBA), 20-25 March 2016, Nantes, France.. .
Open this publication in new window or tab >>Alternative binders for lithium iron silicate (Li2FeSiO4) cathodes
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2016 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-338376 (URN)
Conference
International Battery Association (IBA), 20-25 March 2016, Nantes, France.
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-01-08
Thomas, J., Cai, J., Eriksson, H., Fredin, K., Gustafsson, T., Liivat, A., . . . Vidarsson, H. (2016). Development of an Li2FeSiO4 vs. Graphite LIB for Sustainable Energy Storage. In: : . Paper presented at The 18th International Meeting on Lithium Batteries (IMLB-18) 19-24 June 2016, Chicago, USA.. .
Open this publication in new window or tab >>Development of an Li2FeSiO4 vs. Graphite LIB for Sustainable Energy Storage
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2016 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-338377 (URN)
Conference
The 18th International Meeting on Lithium Batteries (IMLB-18) 19-24 June 2016, Chicago, USA.
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-01-08
Liivat, A., Thomas, J. O., Guo, J. & Yang, Y. (2016). Quantifying the “electrolyte decomposition reaction” contribution to falsely high observed capacities in Li2FeSiO4 - using Mössbauer spectroscopy. In: : . Paper presented at International Battery Association (IBA), 20-25 March 2016, Nantes, France.. .
Open this publication in new window or tab >>Quantifying the “electrolyte decomposition reaction” contribution to falsely high observed capacities in Li2FeSiO4 - using Mössbauer spectroscopy
2016 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-338245 (URN)
Conference
International Battery Association (IBA), 20-25 March 2016, Nantes, France.
Funder
Swedish Research Council, 2010-4824VINNOVA, 2012-02525Swedish Energy Agency, P36015-1
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-01-08
Liivat, A., Thomas, J., Guo, J. & Yang, Y. (2015). Evidence for a >1 electron reaction in Li2FeSiO4: an in situ  Mössbauer spectroscopy study. In: : . Paper presented at . 20th International Conference on Solid State Ionics (SSI-20), 14-19 June, 2015, Keystone, Colorado.. .
Open this publication in new window or tab >>Evidence for a >1 electron reaction in Li2FeSiO4: an in situ  Mössbauer spectroscopy study
2015 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-338384 (URN)
Conference
. 20th International Conference on Solid State Ionics (SSI-20), 14-19 June, 2015, Keystone, Colorado.
Funder
Swedish Research Council, 2010-4824VINNOVA, 2012-02525
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-01-08
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