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Edström, Kristina, ProfessorORCID iD iconorcid.org/0000-0003-4440-2952
Publications (10 of 250) Show all publications
Björklund, E., Wikner, E., Younesi, R., Brandell, D. & Edström, K. (2018). Influence of state-of-charge in commercial LiNi0.33Mn0.33Co0.33O2/LiMn2O4-graphite cells analyzed by synchrotron-based photoelectron spectroscopy. Journal of Energy Storage, 15, 172-180
Open this publication in new window or tab >>Influence of state-of-charge in commercial LiNi0.33Mn0.33Co0.33O2/LiMn2O4-graphite cells analyzed by synchrotron-based photoelectron spectroscopy
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2018 (English)In: Journal of Energy Storage, ISSN 2352-152X, Vol. 15, p. 172-180Article in journal (Refereed) Published
Abstract [en]

Degradation mechanisms in 26 Ah commercial Li-ion battery cells comprising graphite as the negative electrode and mixed metal oxide of LiMn2O4 (LMO) and LiNi1/3Mn1/3Co1/3O2 (NMC) as the positive electrode are here investigated utilising extensive cycling at two different state-of-charge (SOC) ranges, 10–20% and 60–70%, as well as post-mortem analysis. To better analyze these mechanisms electrochemically, the cells were after long-term cycling reassembled into laboratory scale “half-cells” using lithium metal as the negative electrode, and thereafter cycled at different rates corresponding to 0.025 mA/cm2 and 0.754 mA/cm2. The electrodes were also analyzed by synchrotron-based hard x-ray photoelectron spectroscopy (HAXPES) using two different excitation energies to determine the chemical composition of the interfacial layers formed at different depth on the respective electrodes. It was found from the extensive cycling that the cycle life was shorter for the cell cycled in the higher SOC range, 60–70%, which is correlated to findings of an increased cell resistance and thickness of the SEI layer in the graphite electrode as well as manganese dissolution from the positive electrode.

Keyword
Li-ion battery, Commercial cells, Battery ageing, Photoelectron spectroscopy
National Category
Chemical Sciences
Identifiers
urn:nbn:se:uu:diva-338184 (URN)10.1016/j.est.2017.11.010 (DOI)
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-01-18Bibliographically approved
Doubaji, S., Ma, L., Asfaw, H. D., Izanzar, I., Xu, R., Alami, J., . . . Saadoune, I. (2018). On the P2-NaxCo1−y(Mn2/3Ni1/3)yO2 Cathode Materials for Sodium-Ion Batteries: Synthesis, Electrochemical Performance, and Redox Processes Occurring during the Electrochemical Cycling. ACS Applied Materials and Interfaces, 10(1), 488-501
Open this publication in new window or tab >>On the P2-NaxCo1−y(Mn2/3Ni1/3)yO2 Cathode Materials for Sodium-Ion Batteries: Synthesis, Electrochemical Performance, and Redox Processes Occurring during the Electrochemical Cycling
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 1, p. 488-501Article in journal (Refereed) Published
Abstract [en]

P2-type NaMO2sodiated layered oxides withmixed transition metals are receiving considerable attention foruse as cathodes in sodium-ion batteries. A study on solidsolution (1−y)P2-NaxCoO2−(y)P2-NaxMn2/3Ni1/3O2(y=0,1/3, 1/2, 2/3, 1) reveals that changing the composition of thetransition metals affects the resulting structure and the stabilityof pure P2 phases at various temperatures of calcination. For 0≤y≤1.0, the P2-NaxCo(1−y)Mn2y/3Niy/3O2solid-solutioncompounds deliver good electrochemical performance whencycled between 2.0 and 4.2 V versus Na+/Na with improved capacity stability in long-term cycling, especially for electrodematerials with lower Co content (y= 1/2 and 2/3), despite lower discharge capacities being observed. The (1/2)P2-NaxCoO2−(1/2)P2-NaxMn2/3Ni1/3O2composition delivers a discharge capacity of 101.04 mAh g−1with a capacity loss of only 3% after 100cycles and a Coulombic efficiency exceeding 99.2%. Cycling this material to a higher cutoffvoltage of 4.5 V versus Na+/Naincreases the specific discharge capacity to≈140 mAh g−1due to the appearance of a well-defined high-voltage plateau, but afteronly 20 cycles, capacity retention declines to 88% and Coulombic efficiency drops to around 97%. In situ X-ray absorption near-edge structure measurements conducted on composition NaxCo1/2Mn1/3Ni1/6O2(y= 1/2) in the two potential windows studiedhelp elucidate the operating potential of each transition metal redox couple. It also reveals that at the high-voltage plateau, all ofthe transition metals are stable, raising the suspicion of possible contribution of oxygen ions in the high-voltage plateau.

Keyword
Na-ion batteries, P2-type materials, energy storage, in situ XANES measurements, high-voltage plateau
National Category
Natural Sciences Inorganic Chemistry
Research subject
Chemistry with specialization in Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-337712 (URN)10.1021/acsami.7b13472 (DOI)000422814400053 ()29098854 (PubMedID)
Funder
StandUpSwedish Research Council, 2015-05106
Available from: 2018-01-03 Created: 2018-01-03 Last updated: 2018-02-28Bibliographically approved
Sun, B., Asfaw, H. D., Rehnlund, D., Mindemark, J., Nyholm, L., Edström, K. & Brandell, D. (2018). Towards Solid-State 3D-Microbatteries using Functionalized Polycarbonate-based Polymer Electrolytes. ACS Applied Materials and Interfaces, 10(3), 2407-2413
Open this publication in new window or tab >>Towards Solid-State 3D-Microbatteries using Functionalized Polycarbonate-based Polymer Electrolytes
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 3, p. 2407-2413Article in journal (Refereed) Published
Abstract [en]

3D-microbatteries (3D-MBs) impose new demands for theselection, fabrication and compatibility of the different battery components, notleast the electrolytes. Herein, solid polymer electrolytes (SPEs) based on poly(trimethylene carbonate) (PTMC) have been implemented in 3D-MB systems. 3D electrodes of two different architectures, LiFePO4-coated carbon foams and Cu2O-coated Cu nanopillars, have been coated with SPEs and used in Li-cells. Functionalized PTMC with hydroxyl end groups was found to enable uniform and well-covering coatings on LiFePO4-coated carbon foams, although the cell cycling performance was limited by the large SPE resistance. By employing a SPE prepared from a copolymer of TMC and caprolactone (CL), with higher ionic conductivity, Li-cells composed of Cu2O-coated Cu nanopillars were constructed and tested both at room temperature and 60 °C. The footprint areal capacity of the cells was ca. 0.02 mAh cm-2 for an area gain factor (AF) of 2.5, and 0.2 mAh cm-2 for a relatively dense nanopillar-array (AF=25) at a current density of 0.008 mA cm-2at ambient temperature (22±1 °C). These results provide new routes towards the realization of all-solid-state 3D-MBs.

Keyword
Li-battery, 3D-microbattery, polymer electrolyte, nanopillars, carbon foam, Cu2O, Cu, nanorods
National Category
Inorganic Chemistry Materials Chemistry
Research subject
Chemistry with specialization in Organic Chemistry; Chemistry with specialization in Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-336964 (URN)10.1021/acsmi.7b13788 (DOI)000423496500027 ()29199816 (PubMedID)
Funder
StandUp
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2018-03-16Bibliographically approved
Etman, A., Inge, K., Jiaru, X., Younesi, R., Edström, K. & Sun, J. (2017). A Water Based Synthesis of Ultrathin Hydrated Vanadium Pentoxide Nanosheets for Lithium Battery Application: Free Standing Electrodes or Conventionally Casted Electrodes?. Electrochimica Acta, 252, 254-260
Open this publication in new window or tab >>A Water Based Synthesis of Ultrathin Hydrated Vanadium Pentoxide Nanosheets for Lithium Battery Application: Free Standing Electrodes or Conventionally Casted Electrodes?
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2017 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 252, p. 254-260Article in journal (Refereed) Published
Abstract [en]

Abstract: Ultrathin hydrated vanadium pentoxide (V2O5·nH2O) nanosheets are fabricated via a water based exfoliation technique. The exfoliation process involves reflux of the precursor, 1:4 mixture of VO2 and V2O5, in water at 80 °C for 24 h. Operando and ex situ X-ray diffraction (XRD) studies are conducted to follow the structural changes during the exfoliation process. The chemical and thermal analyses suggest that the molecular formula of the nanosheet is H 0.2 V 1.8 V V 0.2 IV O 5 ⋅ 0.5 H 2 O . The V2O5·nH2O nanosheets are mixed with 10% of multi-walled carbon nanotube (MW-CNT) to form a composite material assigned as (VOx-CNT). Free standing electrodes (FSE) and conventionally casted electrodes (CCE) of VOx-CNT are fabricated and then tested as a positive electrode material for lithium batteries. The FSE shows reversible capacities of 300 and 97 mAhg-1 at current densities of 10 and 200 mAhg-1, respectively. This is better than earlier reports for free-standing electrodes. The CCE delivers discharge capacities of 175 and 93 mAhg-1 at current densities of 10 and 200 mAhg-1, respectively.

Place, publisher, year, edition, pages
Elsevier, 2017
Keyword
batteries
National Category
Materials Chemistry
Research subject
Materials Science; Chemistry with specialization in Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-334671 (URN)10.1016/j.electacta.2017.08.137 (DOI)000413009800030 ()
Funder
Berzelii Centre EXSELENTSwedish Research Council, 2012-4681Swedish Energy AgencyKnut and Alice Wallenberg FoundationStandUp
Available from: 2017-11-25 Created: 2017-11-25 Last updated: 2018-01-25Bibliographically approved
Farhat, D., Ghamouss, F., Maibach, J., Edström, K. & Lemordant, D. (2017). Adiponitrile-Lithium Bis(trimethylsulfonyl)imide Solutions as Alkyl Carbonate-free Electrolytes for Li4Ti5O12 (LTO)/LiNi1/3Co1/3Mn1/3O2 (NMC) Li-Ion Batteries. ChemPhysChem, 18(10), 1333-1344
Open this publication in new window or tab >>Adiponitrile-Lithium Bis(trimethylsulfonyl)imide Solutions as Alkyl Carbonate-free Electrolytes for Li4Ti5O12 (LTO)/LiNi1/3Co1/3Mn1/3O2 (NMC) Li-Ion Batteries
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2017 (English)In: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 18, no 10, p. 1333-1344Article in journal (Refereed) Published
Abstract [en]

Recently, dinitriles (NC(CH2)(n)CN) and especially adiponitrile (ADN, n = 4) have attracted attention as safe electrolyte solvents owing to their chemical stability, high boiling points, high flash points, and low vapor pressure. The good solvation properties of ADN toward lithium salts and its high electrochemical stability (approximate to 6 V vs. Li/Li+) make it suitable for safer Li-ions cells without performance loss. In this study, ADN is used as a single electrolyte solvent with lithium bis(trimethylsulfonyl) imide (LiTFSI). This electrolyte allows the use of aluminium collectors as almost no corrosion occurs at voltages up to 4.2 V. The physicochemical properties of the ADN-LiTFSI electrolyte, such as salt dissolution, conductivity, and viscosity, were determined. The cycling performances of batteries using Li4Ti5O12 (LTO) as the anode and LiNi1/3Co1/3Mn1/3O2 (NMC) as the cathode were determined. The results indicate that LTO/NMC batteries exhibit excellent rate capabilities with a columbic efficiency close to 100 %. As an example, cells were able to reach a capacity of 165 mAhg(-1) at 0.1C and a capacity retention of more than 98% after 200 cycles at 0.5 C. In addition, electrodes analyses by SEM, X-ray photoelectron spectroscopy (XPS), and electrochemical impedance spectroscopy after cycling confirming minimal surface changes of the electrodes in the studied battery system.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2017
Keyword
adiponitrile, Li-ion batteries, lithium bis(trimethylsulfonyl)imide, Li4Ti5O12 (LTO), LiNi1/3Co1/3Mn1/3O2 (NMC)
National Category
Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-327150 (URN)10.1002/cphc.201700058 (DOI)000402713200016 ()28231422 (PubMedID)
Funder
EU, FP7, Seventh Framework Programme, Hi-C
Available from: 2017-08-25 Created: 2017-08-25 Last updated: 2017-12-30
Lindgren, F., Rehnlund, D., Källquist, I., Nyholm, L., Edström, K., Hahlin, M. & Maibach, J. (2017). Breaking Down a Complex System: Interpreting PES Peak Positions for Cycled Li-ion Battery Electrodes. The Journal of Physical Chemistry C, 121, 27303-27312
Open this publication in new window or tab >>Breaking Down a Complex System: Interpreting PES Peak Positions for Cycled Li-ion Battery Electrodes
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2017 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 121, p. 27303-27312Article in journal (Refereed) Published
Abstract [en]

Photoelectron spectroscopy (PES) is an important technique for tracing and understanding the side reactions responsible for decreasing performance of Li-ion batteries. Interpretation of different spectral components is dependent on correct binding energy referencing and for battery electrodes this is highly complex. In this work, we investigate the effect on binding energy reference points in PES in correlation to solid electrolyte interphase (SEI) formation, changing electrode potentials and state of charge variations in Li-ion battery electrodes. The results show that components in the SEI have a significantly different binding energy reference point relative to the bulk electrode material (i.e. up to 2 eV). It is also shown that electrode components with electronically insulating/semi-conducting nature are shifted as a function of electrode potential relative to highly conducting materials. Further, spectral changes due to lithiation are highly depending on the nature of the active material and its lithiation mechanism. Finally, a strategy for planning and evaluating PES experiments on battery electrodes is proposed where some materials require careful choice of one or more internal reference points while others may be treated essentially without internal calibration.

National Category
Physical Sciences Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-336952 (URN)10.1021/acs.jpcc.7b08923 (DOI)000418393900008 ()
Funder
Swedish Energy Agency, 40495-1EU, FP7, Seventh Framework Programme, Eurolion & HiCSwedish Research Council, 2016-03545VINNOVA, High Voltage ValleyStandUp
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2018-02-16Bibliographically approved
Kotronia, A., Asfaw, H. D., Brandell, D. & Edström, K. (2017). CaS- and MgS-assisted graphitization of porous carbons for energy storage applications. In: : . Paper presented at Oorgandagarna 2017.
Open this publication in new window or tab >>CaS- and MgS-assisted graphitization of porous carbons for energy storage applications
2017 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Chemical Sciences
Research subject
Chemistry with specialization in Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-338141 (URN)
Conference
Oorgandagarna 2017
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-01-08Bibliographically approved
Qiu, Z., Ma, Y., Edström, K., Niklasson, G. A. & Edvinsson, T. (2017). Controlled crystal growth orientation and surface charge effects in self-assembled nickel oxide nanoflakes and their activity for the oxygen evolution reaction. International journal of hydrogen energy, 42(47), 28397-28407
Open this publication in new window or tab >>Controlled crystal growth orientation and surface charge effects in self-assembled nickel oxide nanoflakes and their activity for the oxygen evolution reaction
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2017 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 42, no 47, p. 28397-28407Article in journal (Refereed) Published
Abstract [en]

Although sustainable hydrogen production from solar energy is a promising route for the future, the cost of the necessary photovoltaic and photoelectrochemical devices as well as a lack of detailed understanding and control of catalyst interfaces in nanomaterials with high catalytic activity are the largest impediments to commercial implementation. Here, we report how a higher catalytic efficiency can be achieved by utilizing an earth-abundant Nickel oxide (NiO) catalyst via an improved control of the crystalline growth orientation and self-assembly. The relationship between the surface charge and the morphology of the nano-catalysts is investigated using a hydrothermal method where the pH is utilized to control both the crystal growth direction and crystallization of Ni(OH)2 and eventually in NiO, where the self-assembly properties of nanoflakes (NFs) into hierarchical flower-like nickel oxide NFs depend on balancing of forces during synthesis. The surface charge ofthe NiO at different pH values was measured with electrophoretic dynamic light scattering (EDLS) and is known to be closely related to that of Ni(OH)2 and is here utilized to control the relative change in the surface charge in the precursor solution. By preparing NiO NFs under variation of the pH conditions of the precursor Ni(OH)2 system, the surface energies of exposed lattice planes of the growing nanostructures can be altered and an enhanced crystal growth orientation in a different direction can be controlled. Specifically, the [111] and [220] growth orientation in cubic NiO can be favored or suppressed with respect to the [200] direction. Benefiting from the large surface area provided by the mesoporous NiO NFs, the catalyst electrode exhibits high activity toward the oxygen evolution reactions in alkaline electrolyte. The NiO nanostructure synthesized at pH 10 displays oxygen evolution reaction (OER) overpotential of 0.29 V and 0.35 V versus the reversible hydrogen electrode (RHE) at 1 mA cm2 and 10 mA cm2 current density, respectively. This is compared to commercial NiO with more than 0.15 V additional overpotential and the same or lower overpotential compared to RuO2 and IrO2 at alkaline conditions. The results show that the OER catalytic activity can be drastically increased by a detailed control of the crystal growth orientation and the self-assembly behavior where the active surface charge around the point of zero charge during synthesis of the metal hydroxides/oxides is introduced as an important design principle for producing efficient electrocatalysts.

Place, publisher, year, edition, pages
Elsevier, 2017
Keyword
Nickel oxide Electrocatalyst, Crystalline growth directio, n Oxygen evolution reaction, Surface charge
National Category
Nano Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-334825 (URN)10.1016/j.ijhydene.2017.09.117 (DOI)000416495200025 ()
Funder
Swedish Energy AgencySwedish Research Council
Available from: 2017-11-28 Created: 2017-11-28 Last updated: 2018-03-19Bibliographically approved
Nordh, T., Jeschull, F., Younesi, R., Koçak, T., Tengstedt, C., Edström, K. & Brandell, D. (2017). Different Shades of Li4Ti5O12 Composites: The Impact of the Binder on Interface Layer Formation. ChemElectroChem, 4(10), 2683-2692
Open this publication in new window or tab >>Different Shades of Li4Ti5O12 Composites: The Impact of the Binder on Interface Layer Formation
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2017 (English)In: ChemElectroChem, ISSN 2196-0216, Vol. 4, no 10, p. 2683-2692Article in journal (Refereed) Published
Abstract [en]

Replacing the traditional PVdF(-HFP) electrode binder by water-soluble alternatives can potentially render electrode fabrication more environmentally benign. Herein, the surface layer formation of stored and cycled samples of two water-based Li4Ti5O12 composites employing either poly(sodium acrylate) (PAA-Na) or sodium carboxymethyl cellulose (CMC-Na) as binders are studied by X-ray photoelectron spectroscopy. In all three formulations, the surface layer composition formed upon storage differed notably from the solid-electrolyte interphase (SEI) layer formed on cycled samples. The surface layer under open-circuit conditions seems to originate mostly from the electrolyte salt (LiPF6) degradation. The comparison with cycled samples after 10 and 100 cycles shows a continuous build-up of an SEI layer on PAA-Na and PVdF-HFP electrodes. In contrast, on CMC-Na containing electrodes the SEI composition remains nearly unchanged. The results correlate well with the electrochemical behavior.

National Category
Materials Chemistry
Research subject
Chemistry with specialization in Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-331111 (URN)10.1002/celc.201700395 (DOI)000412892600036 ()
Funder
StandUpSwedish Research Council, 20123837
Available from: 2017-10-10 Created: 2018-02-05 Last updated: 2018-02-06Bibliographically approved
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)
Available from: 2017-12-15 Created: 2017-12-15 Last updated: 2018-01-03Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-4440-2952

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