Sökning: "in-situ XRD"

Visar resultat 11 - 15 av 55 avhandlingar innehållade orden in-situ XRD.

1. 11. New Fullerene Materials Obtained in Solution and by High Pressure High Temperature Treatment

   Författare :Alexandr Talyzin; B. Sundqvist; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry; fullerene; solution; high pressure; Raman spectroscopy; polymerisation; XRD; Kemi; Chemistry; Kemi; Inorganic Chemistry; oorganisk kemi;

   Sammanfattning : Crystallization of C60 and C70 from organic solution often leads to the formation of new solvates and other fullerene compounds. In the present thesis, a number of such solvates were obtained and their phase transitions studied using in situ "in solution" techniques. LÄS MER

3. 12. Structural Changes in Lithium Battery Materials Induced by Aging or Usage

   Författare :Rickard Eriksson; Kristina Edström; Torbjörn Gustafsson; Leif Nyholm; Marca Doeff; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Li-ion batteries; XRD; EXAFS; HAXPES; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

   Sammanfattning : Li-ion batteries have a huge potential for use in electrification of the transportation sector. The major challenge to be met is the limited energy storage capacity of the battery pack: both the amount of energy which can be stored within the space available in the vehicle (defining its range), and the aging of the individual battery cells (determining how long a whole pack can deliver sufficient energy and power to drive the vehicle). LÄS MER

4. 13. Structural and Electrochemical Relations in Electrode Materials for Rechargeable Batteries

   Författare :Viktor Renman; Kristina Edström; Mario Valvo; Cesar Pay Gómez; Mats Johnsson; Helmer Fjellvåg; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; batteries; electrochemical energy storage; oxohalides; conversion; alloy; pyrosilicate; CuHCF; MnHCM; XRD; XANES; in operando; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

   Sammanfattning : Rechargeable batteries have already conquered the market of portable electronics (i.e., mobile phones and laptops) and are set to further enable the large-scale deployment of electric vehicles and hybrid electric vehicles in a not too distant future. LÄS MER

5. 14. Microstructural Development of Nanocrystalline Ni- and Co-Based Materilas upon Annealing

   Författare :Melina da Silva; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ni; grain growth; nanocrystalline materials; Co-P; Ni-Fe; thermal stability; TEM in-situ annealing;

   Sammanfattning : Nanocrystalline materials are a relatively new group of materials that are constituted by crystals/grains of a few nanometers in size. Because their mechanical, physical and chemical properties are often superior compared to their microcrystalline counterparts, these materials are attractive for many industrial applications. LÄS MER

7. 15. LiFeSO4F as a Cathode Material for Lithium-Ion Batteries : Synthesis, Structure, and Function

   Författare :Adam Sobkowiak; Fredrik Björefors; Kristina Edström; Anna Andersson; M. Rosa Palacin; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Li-ion battery; cathode; LiFeSO4F; tavorite; triplite; synthesis; performance; structure; coating; PEDOT; XRD; Mössbauer spectrocopy; SEM; TEM; electrochemistry; Kemi med inriktning mot materialkemi; Chemistry with specialization in Materials Chemistry;

   Sammanfattning : In this thesis, two recently discovered polymorphs of LiFeSO4F, adopting a tavorite- and triplite-type structure, were investigated as potential candidates for use as cathode materials in Li-ion batteries. The studies aimed at enriching the fundamental understanding of the synthetic preparations, structural properties, and electrochemical functionality of these materials. LÄS MER