Browsing NTNU Open by Author "Pollen, Harald Norrud"
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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 ... -
Developing high-energy cathodes for Li-ion batteries based on Ni-rich layered oxides
Pollen, Harald Norrud (Doctoral theses at NTNU;2023:443, Doctoral thesis, 2023)Energy storage in rechargeable batteries is essential for implementing more renewable energy into the global energy mix. Batteries can, for instance, be connected to solar or wind energy systems to handle the intermittency ... -
Improved cyclability of Nickel-rich layered oxides
Wagner, Nils Peter; Tolchard, Julian R; Tron, Artur; Pollen, Harald Norrud; Gaertner, Heiko; Vullum, Per Erik (Peer reviewed; Journal article, 2020)This study compares the physico- and electro- chemical properties of LiNi0.8Mn0.10Co0.1O2 (NMC811) and LiNi0.83Mn0.06Co0.09Al0.1O2 (NMCA) prepared by an oxalic acid co-precipitation. Deposition of a SiO2 surface coating ... -
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 (Journal article; Peer reviewed, 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 ... -
A Single-Pot Co-Precipitation Synthesis Route for Ni-Rich Layered Oxide Materials with High Cycling Stability
Pollen, Harald Norrud; Tolchard, Julian R; Svensson, Ann Mari; Wagner, Nils Peter (Peer reviewed; Journal article, 2022)In this work we report variations of LiNi0.88Mn0.06Co0.06O2 synthesised through a single-pot oxalic acid co-precipitation route, in which all cation precursors were added in the same step. The effects of Al-doping, ... -
Synthesis and Structural Stability Investigations of Mg and Nb Modified Ultra-High Ni Layered Oxides for Li-ion Batteries
Andersen, Siri (Master thesis, 2022)Nikkel-rike lagbygde oksider har blitt bevist å kunne oppnå veldig høy kapasitet noe som har ført til stor interesse for dem i industrien. En negativ egenskap ved disse materialene er derimot den strukturelle ustabiliteten ...