Blar i NTNU Open på forfatter "Gunnarshaug, Astrid Fagertun"

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    • Effect of the Ion, Solvent, and Thermal Interaction Coefficients on Battery Voltage 

      Gullbrekken, Øystein; Gunnarshaug, Astrid Fagertun; Lervik, Anders; Kjelstrup, Signe; Schnell, Sondre Kvalvåg (Peer reviewed; Journal article, 2024)
      In order to increase the adoption of batteries for sustainable transport and energy storage, improved charging and discharging capabilities of lithium-ion batteries are necessary. To achieve this, accurate data that describe ...

    • Peltier effects in lithium-ion battery modeling 

      Spitthoff, Lena; Gunnarshaug, Astrid Fagertun; Bedeaux, Dick; Burheim, Odne Stokke; Kjelstrup, Signe (Peer reviewed; Journal article, 2021)
      A high battery temperature has been shown to be critical for lithium-ion batteries in terms of performance, degradation, and safety. Therefore, a precise knowledge of heat sources and sinks in the battery is essential. We ...

    • Reversible Heat Effects in Electrodes Relevant for Lithium-Ion Batteries 

      Bærheim, Trym (Master thesis, 2021)
      Med økende bruk av lithium-ione batterier for å lagre energi, blir det stadig viktigere å forstå interne varmeeffekter for å redusere aldring og bedre ytelsen til disse. Tidligere forskning indikerer at den reversible ...

    • Reversible heat effects of lithium metal- and porous lithium iron phosphate electrodes 

      Gunnarshaug, Astrid Fagertun; Burheim, Odne Stokke; Kjelstrup, Signe (Peer reviewed; Journal article, 2023)
      We report Peltier heats and reaction entropy of cells with lithium metal- and near fully lithiated lithium iron phosphate (LFP) electrodes. The Peltier heats were measured through the Seebeck coefficient of thermogalvanic ...

    • Review - Reversible heat effects in cells relevant for lithium-ion batteries 

      Gunnarshaug, Astrid Fagertun; Vie, Preben Joakim Svela; Kjelstrup, Signe (Peer reviewed; Journal article, 2021)
      We review measurements of reversible heat effects in lithium-ion batteries, i.e. entropy changes and Seebeck coefficients of cells with relevant electrodes. We show how to compute the Peltier heat of battery electrodes ...

    • Seebeck, Peltier, and Soret effects: On different formalisms for transport equations in thermogalvanic cells 

      Kjelstrup, Signe; Kristiansen, Kim Roger; Gunnarshaug, Astrid Fagertun; Bedeaux, Dick (Peer reviewed; Journal article, 2023)
      Thermogalvanic cells convert waste heat directly to electric work. There is an abundance of waste heat in the world and thermogalvanic cells may be underused. We discuss theoretical tools that can help us understand and ...

    • Single Electrode Entropy Change for LiCoO2 Electrodes 

      Richter, Frank; Gunnarshaug, Astrid Fagertun; Burheim, Odne Stokke; Vie, Preben Joakim Svela; Kjelstrup, Signe Helene (Journal article, 2017)
      Heat effects are known to be crucial for the performance of the Li-battery. In addition to the irreversible effects (e.g. Joule heat), reversible heat effects may play a role. These effects, i.e. the Soret and Seebeck ...

    • The reversible heat effects at lithium iron phosphate- and graphite electrodes 

      Gunnarshaug, Astrid Fagertun; Kjelstrup, Signe; Bedeaux, Dick; Richter, Frank; Burheim, Odne Stokke (Journal article; Peer reviewed, 2019)
      Lithium ion batteries are used to store and produce electric energy. During the charging- and discharging processes, net heat is released or adsorbed in the battery. Temperature is one of the most important factors for ...

    • Thermoelectric Phenomena in Lithium Ion Batteries and Thermogalvanic Cells 

      Gunnarshaug, Astrid Fagertun (Doctoral theses at NTNU;2023:308, Doctoral thesis, 2023)
      Electrochemical cells are central in the shift towards green energy sources. Lithium-ion batteries have rapidly become one of the world’s leading energy storage technologies. Thermogalvanic cells can be used to convert ...

    • Thermoelectric Properties of Non-Aqueous Electrochemical Cells - Local Reversible Heat Effects Relevant for Lithium Ion Batteries 

      Gunnarshaug, Astrid Fagertun (Master thesis, 2018)
      The aim of this thesis was to investigate the thermoelectric properties and local reversible heat effects of cells relevant to lithium-ion batteries. The theory of non-equilibrium thermodynamics and experimental measurements ...

    • Transport coefficients for ion and solvent coupling. The case of the lithium-ion battery electrolyte 

      Kjelstrup, Signe Helene; Gunnarshaug, Astrid Fagertun; Gullbrekken, Øystein; Schnell, Sondre Kvalvåg; Lervik, Anders (Peer reviewed; Journal article, 2023)
      Transport properties are essential for the understanding and modeling of electrochemical cells, in particular complex systems like lithium-ion batteries. In this study, we demonstrate how a certain degree of freedom in the ...