Single-crystal growth, crystal structure analysis and physical properties of lithium overstoichiometric Li1Â +Â xCoO2

The single-crystal of lithium overstoichiometric Li1 + xCoO2 was synthesized by a flux method using LiCl and Li2O2 flux system. The obtained Li1 + xCoO2 single-crystal is black and has the shape of a plate. Li1 + xCoO2 crystallizes in space group R3¯m, a = 2.8207 (2) Å and c = 14.0688 (14) Å. The structure was determined by a single-crystal X-ray study and refined to the conventional values of R = 1.04% and wR = 1.41% for 44 independent observed reflections. The cobalt state of Li1 + xCoO2 was confirmed by the data of 7Li-MAS-NMR, the magnetic susceptibility measurement and the electrochemical Li insertion/extraction experiments.