Blar i NTNU Open på forfatter "Svensson, Ann Mari"
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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 ... -
Effect of carbon content and annealing atmosphere on phase purity and morphology of Li2MnSiO4 synthesized by a PVA assisted sol–gel method
Wagner, Nils Peter; Svensson, Ann Mari; Vullum-Bruer, Fride (Journal article; Peer reviewed, 2015)Lithium transition metal orthosilicates of the general formula Li2MSiO4 have gained great interest as potential positive electrode material for Li-ion batteries. This study reports the dependence of phase purity and ... -
Effect of Coke Properties on the Bubble Formation at the Anodes During Aluminium Electrolysis in Laboratory Scale
Gebarowski, Wojciech; Ratvik, Arne Petter; Rørvik, Stein; Lossius, Lorentz Petter; Linga, Hogne; Svensson, Ann Mari (Journal article, 2017)The anodic reaction of aluminium electrolysis cells leads to the formation of CO2 bubbles, which partly screen the anode surface and leads to an increase in the cell voltage. An advantage of these bubbles is that the ... -
Electrochemical activation of a diatom-derived SiO<inf>2</inf>/C composite anode and its implementation in a lithium ion battery
Renman, Viktor; Blanco, Maria Valeria; Norberg, Andreas Nicolai; Vullum-Bruer, Fride; Svensson, Ann Mari (Peer reviewed; Journal article, 2021)Nano-architectured silica is extracted from algae harvested in the ocean. Its electrochemical properties are investigated as an anode material for lithium ion batteries. The beneficial effect of a carbon coating formed by ... -
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 (Chapter, 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 ... -
Electrochemical impedance spectroscopy of a porous graphite electrode used for Li-ion batteries with EC/PC based electrolytes
Foss, Carl Erik Lie; Svensson, Ann Mari; Sunde, Svein; Vullum-Bruer, Fride (Journal article; Peer reviewed, 2012)Electrochemical impedance spectroscopy has been employed to investigate different electrolyte compositions used for lithium-ion batteries. Diffusion coefficients in ethylene carbonate (EC) was estimated to be in order of ... -
Electrochemical Reactivity and Wetting Properties of Anodes Made from Anisotropic and Isotropic Cokes
Sommerseth, Camilla; Thorne, Rebecca Jayne; Ratvik, Arne Petter; Sandnes, Espen; Rørvik, Stein; Lossius, Lorentz Petter; Linga, Hogne; Svensson, Ann Mari (Journal article, 2016)High quality anodes require stable raw materials. As the quality of the coke available for production of anodes is changing, future production will rely on cokes that are more isotropic with higher impurity levels than ... -
Enhanced activated carbon lithium-ion capacitor electrochemical stability through electrolyte dielectric optimisation
Eleri, Obinna Egwu; Pires, Julie; Huld, Frederik Thorbjørn; Lu, Song; Schweigart, Philipp; Svensson, Ann Mari; Lou, Fengliu; Yu, Zhixin (Peer reviewed; Journal article, 2023)Interactions between electrolyte constituents and active materials strongly influence the capacity, energy density, and cycling stability of energy storage devices. In this study, the role of electrolyte dielectric on the ... -
Evaluation of selected ionic liquids as electrolytes for silicon anodes in li-ion batteries
Rogstad, Daniel Tevik; Einarsrud, Mari-Ann; Svensson, Ann Mari (Peer reviewed; Journal article, 2021)In this work, four selected ionic liquids (ILs), in combination with lithium bis(fluorosulfonyl)imide salt (LiFSI) were explored as electrolytes for anodes made from micron-sized metallurgical grade silicon. The ionic ... -
Exploring Silica from Diatom Frustules as a High Performance, Low Cost and Environmentally Friendly Anode Material for Lithium Ion Batteries
Norberg, Andreas Nicolai (Master thesis, 2017)In this work, silica extracted from diatom frustules was explored as a potential high performance, low cost and environmentally friendly anode material for lithium ion batteries. The diatom frustules were washed and calcined, ... -
Fe and V substituted Li2MnSiO4/C As Potential Cathode Material for Li-Ion Batteries
Wagner, Nils Peter; Dalod, Antoine Robert Marie; Svensson, Ann Mari; Vullum-Bruer, Fride (Journal article; Peer reviewed, 2015)Lithium transition-metal silicate materials are promising candidates for next generation Li-ion batteries since they allow Li extraction/insertion beyond one Li ion per formula unit. They consist of cheap, non-toxic and ... -
Flame-made Lithium Transition Metal Orthosilicates
Wagner, Nils Peter; Svensson, Ann Mari; Vullum-Bruer, Fride (Journal article; Peer reviewed, 2016)Li2MSiO4 (M = Fe, Mn, Co) compounds have since their discovery gained increased attention as alternative, inexpensive and inherently safe positive electrodes for Li-ion batteries. To meet the required performance for an ... -
Fluoroethylene and H2O as additives in electrolytes based on lithium bis(fluorosulfonyl)imide with silicon anodes
Reite, Ragnhild Åkre (Master thesis, 2022)Effekten av fluoretylenkarbonat (FEC) og 1000 ppm H2O som tilsetningsstoffer i en elektrolytt basert på litium bis(fluorsulfonyl)imid (LiFSI) på silisiumanoder, ble studert med hensyn på syklingsevne, Coulombisk effektivitet, ... -
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 (Journal article; Peer reviewed, 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 ... -
High-Temperature Performance of Selected Ionic Liquids as Electrolytes for Silicon Anodes in Li-ion Batteries
Rogstad, Daniel Tevik; Einarsrud, Mari-Ann; Svensson, Ann Mari (Peer reviewed; Journal article, 2022)Ionic liquids, like bis(fluorosulfonyl)imide (FSI) ionic liquids, are promising solvents for lithium ion batteries due to their high thermal stability and wide electrochemical window. Here, electrolytes based on LiFSI and ... -
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 (Journal article; Peer reviewed, 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, ... -
In situ formation of a polypyrrole-coating on a carbon-coated LiNi0.5Mn1.5O4 cathode in Li-ion batteries as a strategy for enhanced cycling stability.
Kvalsvik, Nora (Master thesis, 2023)Li-ion batterier (LiBs) er den ledende batteriteknologien for bærbare enheter og forbrukerelektronikk i dagens marked. Konvensjonelle katodematerialer anvendt i disse batteriene inneholder ofte kobolt, som er giftig, dyrt, ... -
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 ...