ELECTROCHEMICAL AND STRUCTURAL CHARACTERISATION NEAR THE NiO_2 COMPOSITION

摘要

Lithium deintercalation from Li_(1-z)Ni_(1+z)O_2 has shown the strong influence of the amount of extra-nickel ions (z) on the structural transitions observed at high potential. The fluctuations in composition at the local scale between successive interslab spaces and also at a larger scale between different particles with a possible migration of Ni~(3+) ions from the slab to the interslab space allow to give explanations for the complicated and sometimes apparently contradictory behaviours of LiNiO_2 at high potential.