Sökning: "polymer electrolytes"

Visar resultat 16 - 20 av 85 avhandlingar innehållade orden polymer electrolytes.

1. 16. The Art of Cycling – Polymer Electrolytes at Extreme Conditions

   Författare :Isabell L. Johansson; Jonas Mindemark; Daniel Brandell; Masayoshi Watanabe; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Solid polymer electrolytes; Lithium ion batteries; Electrochemical stability; Mechanical stability; Ionic conductivity; Additives; Polycarbonate; Polyester; Polyketone; Kemi med inriktning mot materialkemi; Chemistry with specialization in Materials Chemistry;

   Sammanfattning : With the rapid development of batteries for applications like electric vehicles and energy storage devices, it is essential to design and develop batteries with improved safety, long cycle life, and high energy density. To achieve this goal, the development and improvement of solid-state batteries, containing solid polymer electrolytes, is a promising solution. LÄS MER

3. 17. The Rôle of Side-Chains in Polymer Electrolytes for Batteries and Fuel Cells

   Författare :Jaanus Karo; Hans Siegbahn; Daniel Brandell; Patrik Johansson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; molecular dynamics; polymer electrolytes; side-chains; Li-ion batteries; proton exchange membrane fuel cell PEMFC ; PFSA membrane; Other chemistry; Övrig kemi; Atomic and molecular physics; Atom- och molekylfysik; Materialvetenskap; Materials Science;

   Sammanfattning : The subject of this thesis relates to the design of new polymer electrolytes for battery and fuel cell applications. Classical Molecular Dynamics (MD) modelling studies are reported of the nano-structure and the local structure and dynamics for two types of polymer electrolyte host: poly(ethylene oxide) (PEO) for lithium batteries and perfluorosulfonic acid (PFSA) for polymer-based fuel cells. LÄS MER

4. 18. Anions and Additives for Lithium Battery Electrolytes

   Författare :Johan Scheers; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; lithium batteries; additives; Raman spectroscopy; anions; ab initio; electrolytes; ion pairs;

   Sammanfattning : Based on the atomic postulate, which is now more than 2400 years old, scientists have developed very advanced tools for studying the material world. With the potential realized with modern computers, more and more sophisticated methods are available for predicting real material properties, even from simple theoretical model systems. LÄS MER

5. 19. Conformations and vibrations in polymer electrolytes

   Författare :Patrik Johansson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry; Kemi; Chemistry; Kemi; Inorganic Chemistry; oorganisk kemi;

   Sammanfattning : Solvent-free solid electrolytes can be formed by dissolving a salt in a polymer matrix (e.g. poly (ethylene oxide), PEO). Such compounds are of interest due to their proposed use as solid electrolytes in new types of electrochemical devices e. LÄS MER

7. 20. Lithium Ion Conductive Membranes Based on Co-continuous Polymer Blends

   Författare :Anette Munch Elmér; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Polymerteknik; Polymer technology; biopolymers; conductivity measurements; in-situ UV-polymerisation; solution casting; poly methyl methacrylate ; vinylidene fluoride copolymers; poly ethylene carbonate-co-ethylene oxide methacrylate; PEG methacrylate macromonomers; heterogeneous polymer blends; polymer electrolyte membranes; lithium salt containing gels;

   Sammanfattning : There is a growing need for multifunctional polymeric materials for the development of several important energy conversion technologies. For example, the polymer electrolyte is a key component in lithium polymer batteries. The basic functions of this electrolyte are to efficiently conduct the lithium ions and physically separate the electrodes. LÄS MER