Sökning: "Graphite"

Visar resultat 16 - 20 av 280 avhandlingar innehållade ordet Graphite.

  1. 16. Theoretical studies on one-, two- and three-dimensional carbon structures

    Författare :Mattias Hjort; Linköpings universitet; []
    Nyckelord :Tight binding; Hückel; Fullerenes; graphite; Anderson localization; transfer matrix;

    Sammanfattning : This thesis deals with electronic structure calculations in large carbon based materials, Especially graphite like structures have been studied. For this the tight binding method together with more sophisticated quantum chemical methods has been utilised. LÄS MER

  3. 17. Towards Safer Lithium-Ion Batteries

    Författare :Marie Herstedt; Kristina Edström; Martin Winter; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Inorganic chemistry; lithium-ion batteries; photoelectron spectroscopy; surface film; thermal stability; electrolyte additive; graphite; lithium iron phosphate; Oorganisk kemi; Inorganic chemistry; Oorganisk kemi; Inorganic Chemistry; oorganisk kemi;

    Sammanfattning : Surface film formation at the electrode/electrolyte interface in lithium-ion batteries has a crucial impact on battery performance and safety. This thesis describes the characterisation and treatment of electrode interfaces in lithium-ion batteries. LÄS MER

  4. 18. Low-Cost, Environmentally Friendly Electric Double-Layer Capacitors : Concept, Materials and Production

    Författare :Britta Andres; Håkan Olin; Christina Dahlström; Jonas Örtegren; Renyun Zhang; Mittuniversitetet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Electric Double-Layer Capacitor; Graphite; Cellulose Nanofibers; Large-Scale; Mass Balancing; Metal-Free;

    Sammanfattning : Today’s society is currently performing an exit from fossilfuel energy sources. The change to sustainable alternativesrequires inexpensive and environmentally friendly energy storagedevices. However, most current devices contain expensive,rare or toxic materials. These materials must be replaced bylow-cost, abundant, nontoxic components. LÄS MER

  5. 19. Functional Binders at the Interface of Negative and Positive Electrodes in Lithium Batteries

    Författare :Fabian Jeschull; Daniel Brandell; Gerrit Boschloo; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; binder; lithium-sulfur batteries; graphite; lithium-ion batteries; Kemi med inriktning mot materialkemi; Chemistry with specialization in Materials Chemistry;

    Sammanfattning : In this thesis, electrode binders as vital components in the fabrication of composite electrodes for lithium-ion (LIB) and lithium-sulfur batteries (LiSB) have been investigated.Poly(vinylidene difluoride) (PVdF) was studied as binder for sulfur-carbon positive electrodes by a combination of galvanostatic cycling and nitrogen absorption. LÄS MER

  7. 20. Structure, Bonding and Transport of SiC and Graphitic Systems

    Författare :Eleni Ziambaras; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nanostructures; Knudsen effect; Silicon Carbide SiC ; van der Waals interactions; density functional theory DFT .; graphite;

    Sammanfattning : Today's development of new electronic devices requires materials that can operate under harsh conditions. One such material is Silicon Carbide (SiC) which exhibits superior properties such as chemical inertness, high durability, high thermal stability, high thermal conductivity, and extreme hardness. LÄS MER