Synthesis and electrochemical properties of layered Li0.9Ni0.45Ti0.55O2
Language
en
Article de revue
This item was published in
Chemistry of Materials. 2003, vol. 15, n° 23, p. 4503-4507
American Chemical Society
English Abstract
New Li0.9Ni0.45Ti0.55O2 positive electrode materials were synthesized by means of ion exchange from Na0.9Ni0.45Ti0.55O2. Powder X-ray diffraction (XRD) patterns for these materials indicate that they are isostructural with ...Read more >
New Li0.9Ni0.45Ti0.55O2 positive electrode materials were synthesized by means of ion exchange from Na0.9Ni0.45Ti0.55O2. Powder X-ray diffraction (XRD) patterns for these materials indicate that they are isostructural with -NaFeO2. The degree of cation disordering in the material depends critically on the synthesis conditions. Higher temperatures and longer ion-exchange times induce more cation disordering. Surprisingly, the partially disordered phase shows better capacity retention than the least disordered phase. First-principles calculations indicated the poor capacity retention in the least disordered phase could be attributed to the migration of Ti4+ into the Li layer during the electrochemical testing...Read less <
English Keywords
Solid solution
Electrochemical properties
Chemical synthesis
Layered compounds
Origin
Hal imported