Browsing NTNU Open by Author "Svensson, Ann Mari"
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A Method for Controlled Oxide and Carbon Coating of Silicon Nanoparticles as Anode in Lithium-Ion Batteries
Orderud Skare, Marte (Master thesis, 2017)Silicon has emerged as a promising alternative to graphite in lithium-ion batteries. Silicon can, theoretically, provide up to ten times higher capacity due to its high alloying capabilities with lithium. This improvement ... -
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 ... -
Alternative Li-ion Cathodes based on Transition Metal Orthosilicates
Wagner, Nils P. (Doctoral thesis at NTNU;2016:57, Doctoral thesis, 2016)The aspiration of today’s society to become independent from crude oil and nuclear power led to a rapid growth of renewable energy production. Unfortunately, the majority of these energy sources are discontinuous and require ... -
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 ... -
Anode-free Lithium Metal Batteries with High-Concentration Ether Electrolytes
Skramstad, Magnus (Master thesis, 2021)Med en raskt voksende etterspørsel for batterier, trengs det nye batterier som kan lagre mer energi. Å erstatte dagens grafittanode med litiummetall er en potensiell løsning for å øke energitettheten til litium-ionbatterier. ... -
Anodes for Li‑ion batteries prepared from microcrystalline silicon and enabled by binder’s chemistry and pseudo‑self‑healing
Foss, Carl Erik Lie; Stephan, Müssig; Svensson, Ann Mari; Vie, Preben Joakim Svela; Ulvestad, Asbjørn; Mæhlen, Jan Petter; Koposov, Alexey (Peer reviewed; Journal article, 2020)Silicon, while suffering from major degradation issues, has been recognized as a next promising material to replace currently used graphite in the anodes of Li-ion batteries. Several pathways to mitigate the capacity fading ... -
Borated Salt Additives in LiFSI Based Electrolytes and Their Compatibility with Silicon Anodes, Aluminum Current Collectors and NMC Cathodes in Li-ion Batteries
Holsen, Ingrid Flatebø (Master thesis, 2020)Den dominerende batteriteknologien på markedet i dag er litium ione (Li-ion) batterier. De har lenge dominert batterimarkedet, og spesielt innen forbrukselektronikk er bruken av Li-ion batterier utbredt. Men teknologien ... -
Bubble evolution and anode surface properties in aluminium electrolysis
Thorne, Rebecca Jayne; Sommerseth, Camilla; Ratvik, Arne Petter; Rørvik, Stein; Sandnes, Espen; Lossius, Lorentz Petter; Linga, Hogne; Svensson, Ann Mari (Journal article, 2015)One significant contribution to the anodic potential during aluminum electrolysis is the formation of CO2 bubbles that screen the anode surface. This effect creates an additional ohmic resistance as well as an increased ... -
Carbon-Coated Industrial-Grade Silicon as Potential Anode Material in Lithium-Ion Batteries
Backer, Lasse August Dørum (Master thesis, 2021)Silisium (Si) er et lovende anodemateriale for neste generasjons litium-ione-batterier (LIB) grunnet dens evne til å reversibelt danne legeringer med høy litiumkonsentrasjon. Dette gir en ekstremt høy gravimetrisk kapasitet ... -
Co(OH)2@MnO2 nanosheet arrays as hybrid binder-free electrodes for high-performance lithium-ion batteries and supercapacitors
Kundu, Manab; Singh, Gurvinder; Svensson, Ann Mari (Journal article; Peer reviewed, 2019)Co(OH)2@MnO2 nanosheet arrays were directly grown on nickel foam via two-step electrodeposition method with subsequent heat treatment at 170 °C. The hybrid electrode, where the electrodeposited Co(OH)2 and MnO2 nanosheets ... -
Coke Impurity Characterisation and Electrochemical Performance of Carbon Anodes for Aluminium Production
Jahrsengene, Gøril (Doctoral theses at NTNU;2019:352, Doctoral thesis, 2019)The aluminium production process uses consumable carbon anodes made from calcined petroleum cokes, recycled anode butts and coal tar pitch. The main ingredient is the coke, a side product from the petroleum refining industry. ... -
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 (Journal article; Peer reviewed, 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 ... -
Comparing LiFSI and LiPF6 electrolytes for Algae based Silica Anodes in Li-ion Batteries
Korneliussen, Anne-Line Berg (Master thesis, 2020)Energiteknologi har en stor innvirkning på samfunnet vårt, alt fra miljøutfordringer og økonomisk utvikling til forbruker elektronikk og transportsektoren påvirkes av energiteknologi. I fremtiden vil energiteknologier, ... -
Comparing the Performance of Different Silicon Powders for Use in Lithium-Ion Batteries
Pollen, Harald Norrud (Master thesis, 2018)The topic of this thesis is silicon anodes for lithium-ion batteries. The aim of this thesis is to compare three different types of silicon powders for use in lithium-ion batteries - a micron-sized powder (Silgrain e-Si ... -
Correlation between coke type, microstructure and anodic reaction overpotential in aluminium electrolysis
Thorne, Rebecca Jayne; Sommerseth, Camilla; Ratvik, Arne Petter; Rørvik, Stein; Sandnes, Espen; Lossius, Lorentz Petter; Linga, Hogne; Svensson, Ann Mari (Journal article; Peer reviewed, 2015)Although the anode process during aluminum electrolysis has a substantial overpotential that increases the energy demand and production cost of aluminum, properties of the coke that can influence the electrochemical ... -
Edge/basal/defect ratios in graphite and their influence on the thermal stability of lithium ion batteries
Foss, Carl Erik Lie; Svensson, Ann Mari; Sunde, Svein; Vullum-Bruer, Fride (Journal article, 2016)Raw graphite can be processed industrially in large quanta but for the graphite to be useful in lithium ion batteries (LIB's) certain parameters needs to be optimized. Some key parameters are graphite morphology, active ... -
Effect of a Boron Based Anion Receptor on Graphite and LiFePO4 Electrodes
Tezel, Ahmet Oguz; Sunde, Svein; Gomez-Camer, Juan Luis; Novak, Petr; Svensson, Ann Mari (Peer reviewed; Journal article, 2020)The effect of a boron based anion receptor, tris (hexafluoroisopropyle) borate (THFIPB), on the electrochemistry of graphite was investigated in 1 M LiPF6 in ethylene carbonate/dimethyl carbonate (EC/DMC, 1:1 by weight) ... -
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 ...