Sökning: "Electrolyte impurities"

Visar resultat 1 - 5 av 14 avhandlingar innehållade orden Electrolyte impurities.

  1. 1. Characterisation and modelling of lithium-ion battery electrolytes

    Författare :Peter Georén; KTH; []
    Nyckelord :lithium battery; electrolyte; characterisation; mass transport; stability; modelling; electrochemical; Raman spectroscopy; impedance;

    Sammanfattning : Rechargeable batteries play an important role as energycarriers in our modern society, being present in wirelessdevices for everyday use such as cellular phones, video camerasand laptops, and also in hybrid electric cars. The batterytechnology dominating the market today is the lithium-ion(Li-ion) battery. LÄS MER

  3. 2. Elucidating Chemical and Electrochemical Side-Reaction Mechanisms in Li-ion Batteries

    Författare :Neeha Gogoi; Erik Berg; M. Rosa Palacín; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Lithium-ion battery; solid electrolyte interphase; electrolyte additives; reaction mechanism; ethylene carbonate; vinylene carbonate; tris trimethylsilyl phosphate; surface enhanced Raman spectroscopy; Kemi med inriktning mot materialkemi; Chemistry with specialization in Materials Chemistry;

    Sammanfattning : Lithium-ion batteries constitute a leading technology that plays a major role in the transition towards sustainable transportation and power generation. The stability of modern batteries relies on a passivation layer formed on the negative electrode known as the solid electrolyte interphase (SEI). LÄS MER

  4. 3. Electrochemical Reactions in Polymer Electrolyte Fuel Cells

    Författare :Maria Wesselmark; Svein Sunde; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fuel cell; model electrodes; oxygen reduction; methanol oxidation; formic acid oxidation; hydrogen oxidation; CO oxidation; degradation; tungsten oxide; carbon support; Bränslecell; modellelektroder; syrgasreduktion; metanoloxidation; myrsyraoxidation; vätgasoxidation; CO oxidation; degradering; wolfram oxid; kolsupport; Chemical engineering; Kemiteknik;

    Sammanfattning : The polymer electrolyte fuel cell converts the chemical energy in a fuel, e.g. hydrogen or methanol, and oxygen into electrical energy. The high efficiency and the possibility to use fuel from renewable sources make them attractive as energy converters in future sustainable energy systems. LÄS MER

  5. 4. Failure Mechanisms of Lithium-ion Battery Electrolytes: Detection and Mitigation

    Författare :Susanne Wilken; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; additives; Lithium-ion batteries; thermal stability; LiPF6; electrolytes; vibrational spectroscopy;

    Sammanfattning : The state-of-the-art electrolyte of the lithium-ion batteries (LIBs) present in most portable electronics contains the salt LiPF6 , organic solvents such as ethylene carbonate and dimethyl carbonate and a number of additives. This is true regardless of the exact active materials i.e. electrodes or cell design e. LÄS MER

  7. 5. Critical potential and oxygen evolution of the chlorate anode

    Författare :Linda Nylén; Göran Lindbergh; Yohannes Kiros; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; chlorate; chloride oxidation; oxygen evolution; critical anode potential; chromate; DSA; mass transport; RDE; Chemical engineering; Kemiteknik;

    Sammanfattning : In the chlorate process, natural convection arises thanks to the hydrogen evolving cathode. This increases the mass transport of the different species in the chlorate electrolyte. There is a strong connection between mass transport and the kinetics of the electrode reactions. LÄS MER