Browsing SINTEF Open by Author "Svensson, Ann Mari"
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A XANES Study of Sulfur Speciation and Reactivity in Cokes for Anodes Used in Aluminum Production
Jahrsengene, Gøril; Wells, Hannah C.; Rørvik, Stein; Ratvik, Arne Petter; Haverkamp, Richard G.; Svensson, Ann Mari (Journal article; Peer reviewed, 2018)Availability of anode raw materials in the growing aluminum industry results in a wider range of petroleum cokes being used to produce carbon anodes. The boundary between anode grade cokes and what previously was considered ... -
An EXAFS and XANES Study of V, Ni, and Fe Speciation in Cokes for Anodes Used in Aluminum Production
Jahrsengene, Gøril; Wells, Hannah C.; Sommerseth, Camilla; Ratvik, Arne Petter; Lossius, Lorentz Petter; Sizeland, Katie H.; Kappen, Peter; Svensson, Ann Mari; Haverkamp, Richard G. (Journal article; Peer reviewed, 2019)Lower-quality petroleum coke with higher levels of sulfur and metal impurities will have to be used for the manufacturing of anodes for aluminum production in the future. The sulfur and metallic impurities affect the anode ... -
Comparing Anodic Bubble Behavior of Anodes from Anisotropic and Isotropic Cokes in Laboratory Scale Aluminum Electrolysis Cells
Sommerseth, Camilla; Thorne, Rebecca Jayne; Ratvik, Arne Petter; Rørvik, Stein; Linga, Hogne; Lossius, Lorentz Petter; Svensson, Ann Mari (Peer reviewed; Journal article, 2019)During production of aluminum in Hall-Héroult cells, carbon anodes electrochemically oxidize to form mainly CO2. The CO2 bubbles block the anode working surface during growth and coalescence, leading to cell voltage loss ... -
The effect of addition of the redox mediator dimethylphenazine on the oxygen reaction in porous carbon electrodes for Li/O2 batteries
Vullum-Bruer, Fride; Vullum, Per Erik; Svensson, Ann Mari; Augustin, Matthias (Peer reviewed; Journal article, 2023)Secondary Li–O2 batteries are promising due to their potentially high theoretical energy density. However, both the discharge (oxygen reduction reaction, ORR) and the recharge reaction (oxygen evolution reaction, OER) are ... -
The effect of addition of the redox mediator dimethylphenazine on the oxygen reaction in porous carbon electrodes for Li/O2 batteries
Augustin, Matthias; Vullum, Per Erik; Vullum-Bruer, Fride; Svensson, Ann Mari (Peer reviewed; Journal article, 2023)Secondary Li–O2 batteries are promising due to their potentially high theoretical energy density. However, both the discharge (oxygen reduction reaction, ORR) and the recharge reaction (oxygen evolution reaction, OER) are ... -
The Effect of Varying Mixing Temperatures and Baking Level on the Quality of Pilot Scale Anodes - A Factorial Design Analysis
Sommerseth, Camilla; Thorne, Rebecca Jayne; Ratvik, Arne Petter; Sandnes, Espen; Linga, Hogne; Lossius, Lorentz Petter; Svensson, Ann Mari (Peer reviewed; Journal article, 2017)Identifying optimum anode baking level and mixing temperature are important when producing high quality anodes. The effect of varying mixing temperature and baking level were investigated in terms of the resulting apparent ... -
Electrochemical Behaviour of Carbon Anodes Produced with Different Mixing Temperatures and Baking Levels—A Laboratory Study
Sommerseth, Camilla; Thorne, Rebecca Jayne; Gebarowski, Wojciech; Ratvik, Arne Petter; Rørvik, Stein; Linga, Hogne; Lossius, Lorentz Petter; Svensson, Ann Mari (Light Metals;2019, Chapter; Peer reviewed, 2019)Anodes fabricated from a single source coke were used for investigations of effect of porosity and surface roughness on the electrochemical performance in laboratory scale cells. In order to fabricate anodes differing in ... -
Hematite microdisks as an alternative anode material for lithium-ion batteries
Balasingam, Suresh Kannan; Kundu, Manab; Balamuralitharan, Balakrishnan; Kim, Hee-Je; Svensson, Ann Mari; Jayasayee, Kaushik (Journal article; Peer reviewed, 2019)In this work, hematite microdisks (500 nm to 1 μm in diameter, ∼200 nm in thickness) have been synthesized by a facile hydrothermal method which exhibited good cycling stability at a current density of 200 mA g−1 and ... -
High capacity Mg batteries based on surface-controlled electrochemical reactions
Wang, Lu; Vullum, Per Erik; Asheim, Karina; Wang, Xuehang; Svensson, Ann Mari; Vullum-Bruer, Fride (Journal article; Peer reviewed, 2018)Mg batteries are one of several new battery technologies expected to partially substitute lithium-based batteries in the future due to the lower cost and higher safety. However, the development of Mg batteries has been ... -
High interfacial charge storage capability of carbonaceous cathodes for Mg batteries
Wang, Lu; Jiang, Bo; Vullum, Per Erik; Svensson, Ann Mari; Erbe, Andreas; Selbach, Sverre Magnus; Xu, Huailiang; Vullum-Bruer, Fride (Peer reviewed; Journal article, 2018)A rechargeable Mg battery where the capacity mainly originates from reversible reactions occurring at the electrode/electrolyte interface efficiently avoids the challenge of sluggish Mg intercalation encountered in ... -
Improved electrochemical performance and solid electrolyte interphase properties of electrolytes based on lithium bis(fluorosulfonyl)imide for high content silicon anodes
Asheim, Karina; Vullum, Per Erik; Wagner, Nils Peter; Andersen, Hanne Flåten; Mæhlen, Jan Petter; Svensson, Ann Mari (Peer reviewed; Journal article, 2022)Electrodes containing 60 wt% micron-sized silicon were investigated with electrolytes containing carbonate solvents and either LiPF6 or lithium bis(fluorosulfonyl)imide (LiFSI) salt. The electrodes showed improved performance, ... -
Inside the electrode: Looking at cycling products in Li/O2 batteries
Augustin, Matthias; Vullum, Per Erik; Vullum-Bruer, Fride; Svensson, Ann Mari (Journal article; Peer reviewed, 2019)This work investigates the impact of electrochemical reactions and products on discharge capacity and cycling stability with electrolytes based on two common solvents – tetraethylene glycol dimethyl ether (TEGDME) and ... -
Interphase Engineering of LiNi0.88Mn0.06Co0.06O2 Cathodes Using Octadecyl Phosphonic Acid Coupling Agents
Pollen, Harald Norrud; Nylund, Inger-Emma; Dahl, Øystein; Svensson, Ann Mari; Brandell, Daniel; Younesi, Reza; Tolchard, Julian R; Wagner, Nils Peter (Peer reviewed; Journal article, 2023)Ni-rich layered oxides are proven high-energy cathode materials for Li-ion batteries, but their characteristic short cycle life remains a challenge for implementation on a wider scale. The surface reactivity of Ni-rich ... -
Limitations of Ultrathin Al2O3 Coatings on LNMO Cathodes
Østli, Elise Ramleth; Tesfamhret, Yonas; Wenner, Sigurd; Lacey, Matthew J.; Brandell, Daniel; Svensson, Ann Mari; Selbach, Sverre Magnus; Wagner, Nils P. (Peer reviewed; Journal article, 2021)This study demonstrates the application of Al2O3 coatings for the high-voltage cathode material LiNi0.5–xMn1.5+xO4−δ (LNMO) by atomic layer deposition. The ultrathin and uniform coatings (0.6–1.7 nm) were deposited on LNMO ... -
Modelling capacity fade in silicon-graphite composite electrodes for lithium-ion batteries
Dhillon, Shweta; Hernández, Guiomar; Wagner, Nils Peter; Svensson, Ann Mari; Brandell, Daniel (Peer reviewed; Journal article, 2021)Silicon-based composite electrodes in lithium ion batteries attract increasing attention because of their high theoretical capacity. Here, numerical simulations are used to better understand the interplay between electrochemical ... -
Optical and Electrochemical Characterisation of Carbon Anodes with Varying Porosity and Coke Quality
Jahrsengene, Gøril; Farahani, Mahyar; Linga, Hogne; Svensson, Ann Mari (Peer reviewed; Journal article, 2022)The performance of carbon anodes in aluminium production will depend on both the coke quality (impurities, structure) and the physical properties of the anode (density, permeability, electric resistivity). Here, a set of ... -
Optimizing carbon coating parameters for obtaining SiO2/C anodes with improved electrochemical performance
Blanco, Maria Valeria; Renman, Viktor; Zhu, Jiefang; Vullum-Bruer, Fride; Svensson, Ann Mari (Peer reviewed; Journal article, 2021)In this work, we present a comprehensive and systematic study on the use of low-cost and highly abundant carbon precursors to obtain SiO2/C anodes with superior electrochemical performance towards Li-ions. Different SiO2/C ... -
Performance and failure analysis of full cell lithium ion battery with LiNi0.8Co0.15Al0.05O2 and silicon electrodes
Wagner, Nils Peter; Asheim, Karina; Vullum-Bruer, Fride; Svensson, Ann Mari (Journal article; Peer reviewed, 2019)The influence of the lithium inventory on the performance and degradation mechanism of NCA||Si cells operating at a third of the theoretical silicon capacity is analysed. The lithium inventory was increased by electrochemical ... -
Reactivity of coke in relation to sulfur level and microstructure
Jahrsengene, Gøril; Rørvik, Stein; Ratvik, Arne Petter; Lossius, Lorentz Petter; Haverkamp, Richard G.; Svensson, Ann Mari (The Minerals, Metals & Materials Series;2367-1181, Peer reviewed; Journal article, 2019)Shrinkage induced flow, thermo-solutal convection and equiaxed grain motion are the major transport mechanisms contributing to macrosegregation formation in aluminum alloys produced through Direct Chill casting. Experimental ... -
Silica from diatom frustules as anode material for Li-ion batteries
Norberg, Andreas Nicolai; Wagner, Nils Peter; Kaland, Henning; Vullum-Bruer, Fride; Svensson, Ann Mari (Journal article; Peer reviewed, 2019)In spite of its insulating nature, SiO2 may be utilized as active anode material for Li-ion batteries. Synthetic SiO2 will typically require sophisticated synthesis and/or activation procedures in order to obtain a ...