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Showing result 1 - 5 of 29 swedish dissertations matching the above criteria.

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

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

    Abstract : 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. READ MORE

  4. 2. Mathematical Models for Investigation of Performance, Safety, and Aging in Lithium-Ion Batteries

    Author : Tommy Georgios Zavalis; Göran Lindbergh; Mårten Behm; Yann Bultel; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; lithium-ion battery; modeling; electrochemical processes; impedance; polarization; performance; safety; aging; power optimized battery; litiumjonbatteri; modellering; elektrokemiska processer; impedans; polarisation; prestanda; säkerhet; åldring; effektoptimerat batteri;

    Abstract : Rechargeable lithium-ion batteries have both the power and energy capabilities to be utilized in hybrid electric vehicles and other power demanding applications. However, there are obstacles primarily related to reliability in safety and lifetime. Additionally, there is still room for improvement in the battery performance. READ MORE

  5. 3. Diagnosis of the Lifetime Performance Degradation of Lithium-Ion Batteries : Focus on Power-Assist Hybrid Electric Vehicle and Low-Earth-Orbit Satellite Applications

    Author : Shelley Brown; Göran Lindbergh; Robert Spotnitz; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; lithium-ion battery; LixNi0.8Co0.15Al0.05O2; LixMn2O4; LiyC6; ageing; three-electrode measurements; impedance modelling; surface film characterisation; hybrid electric vehicle; low-earth-orbit satellite; litiumjonbatteri; åldring; treelektroduppställning; impedansmodell; ytfilmskarakterisering; hybridfordon; satelliter; Electrochemistry; Elektrokemi;

    Abstract : Lithium-ion batteries are a possible choice for the energy storage system onboard hybrid electric vehicles and low-earth-orbit satellites, but lifetime performance remains an issue. The challenge is to diagnose the effects of ageing and then investigate the dependence of the magnitude of the deterioration on different accelerating factors (e.g. READ MORE

  6. 4. Characterization methods and modelling for Li-ion batteries: entropy, impedance, pressure, diffusivity & temperature swings induced aging

    Author : Zeyang Geng; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; characterization methods; swelling; temperature swing; model; impedance; lifetime; Li-ion batteries; thermal; pressure; entropy; aging;

    Abstract : Lithium-ion batteries are commonly used for energy storage systems, and temperature is one key impact factor on the cell performance and lifetime. In literature, the focus has been on the ambient temperature of the test condition, and there is little discussion about how the temperature swing during cycling affects the battery lifetime. READ MORE

  7. 5. Kinetic investigation of LiMn2O4 for rechargeable lithium batteries

    Author : Anna-Karin Hjelm; KTH; []
    Keywords : linear sweep voltammetry; electrochemical impedance spectroscopy; potential step; in situ X-ray diffraction; microelectrodes; electrode kinetics; LiMn2O4 cathode; rechargeable lithium batteries;

    Abstract : This thesis is concerned with kinetic characterisation of theinsertion compound LiMn2O4, which is used as positive electrodematerial in rechargeable lithium batteries. Three different typesof electrode configurations have been investigated, namely singleparticles, thin films and composite electrodes. Differentelectrochemical techniques, i.e. READ MORE