Sökning: "Cathode"

Visar resultat 16 - 20 av 207 avhandlingar innehållade ordet Cathode.

1. 16. Cooperative Lithium-Ion Insertion Mechanisms in Cathode Materials for Battery Applications

   Författare :Helen Björk; Tsutomo Ohzuku; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry; Li-ion battery; cathode materials; single-crystal; X-ray diffraction; delithiation; superlattice; phase transformation; charge-ordering; Kemi; Chemistry; Kemi; Inorganic Chemistry; oorganisk kemi;

   Sammanfattning : Understanding lithium-ion insertion/extraction mechanisms in battery electrode materials is of crucial importance in developing new materials with better cycling performance. In this thesis, these mechanisms are probed for two different potential cathode materials by a combination of electrochemical and single-crystal X-ray diffraction studies. LÄS MER

3. 17. Computational Studies of Nanotube Growth, Nanoclusters and Cathode Materials for Batteries

   Författare :Peter Larsson; Rajeev Ahuja; Priya Vashishta; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Materials science; density functional theory; cathode materials; hydrogen-storage materials; carbon nanotube growth; Computational physics; Beräkningsfysik; materiefysik; Physics of Matter; materialvetenskap; Materials Science;

   Sammanfattning : Density functional theory has been used to investigate cathode materials for rechargeable batteries, carbon nanotube interactions with catalyst particles and transition metal catalyzed hydrogen release in magnesium hydride nanoclusters. An effort has been made to the understand structural and electrochemical properties of lithium iron silicate (Li2FeSiO4) and its manganese-doped analogue. LÄS MER

4. 18. Development and Characterisation of Cathode Materials for the Molten Carbonate Fuel Cell

   Författare :Athula Wijayasinghe; KTH; []
   Nyckelord :molten carbonate fuel cell MCFC ; MCFC cathode; LiFeO2-LiCoO2-NiO ternary compositions; electrical conductivity; porous gas diffusion electrodes; polarization; electrochemical performance; post-cell characterization;

   Sammanfattning : Among the obstacles for the commercialization of the MoltenCarbonate Fuel Cell (MCFC), the dissolution of thestate-of-the-art lithiated NiO cathode is considered as aprimary lifetime limiting constraint. Development ofalternative cathode materials is considered as a main strategyfor solving the cathode dissolution problem. LÄS MER

5. 19. LiMn2O4 as a Li-ion Battery Cathode. From Bulk to Electrolyte Interface

   Författare :Tom Eriksson; Michael M. Thackeray; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry; cathode materials; lithium manganese oxide; interface; surface layer; electrode kinetics; Kemi; Chemistry; Kemi; Inorganic Chemistry; oorganisk kemi;

   Sammanfattning : LiMn2O4 is ideal as a high-capacity Li-ion battery cathode material by virtue of its low toxicity, low cost, and the high natural abundance of Mn. Surface related reactions and bulk kinetics have been the major focus of this work. LÄS MER

7. 20. Anion redox processes in novel battery cathode materials investigated by soft X-ray spectroscopy

   Författare :Felix Massel; Laurent Duda; Håkan Rensmo; Maria Hahlin; Kevin Smith; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; soft X-ray spectroscopy; X-ray absorption spectroscopy XAS ; resonant inelastic X-ray scattering RIXS ; lithium-ion battery LIB ; sodium-ion battery SIB ; anionic redox; cathode materials; layered manganese oxide; spinel LNMO;

   Sammanfattning : This thesis presents experimental investigations of the electronic structure of emerging and novel cathode materials used in lithium- and sodium-ion batteries. The investigated materials include a range of oxide materials containing the elements nickel and manganese. LÄS MER