  Electronic phase diagram of LixCoO2 has been re-examined using
potentiostatically de-intercalated single crystal samples. Stable phases of x ~
0.87, 0.72, 0.53, 0.50, 0.43, and 0.33 were found and isolated for physical
property studies. A-type and chain-type antiferromagnetic orderings have been
suggested from magnetic susceptibility measurement results in x ~ 0.87 and 0.50
below ~ 10 K and 200 K, respectively, similar to those found in NaxCoO2 system.
There is no Li vacancy superlattice ordering observed at room temperature for
the electronically stable phase Li0.72CoO2 as revealed by synchrotron X-ray
Laue diffraction. The peculiar magnetic anomaly near ~ 175 K as often found in
powder samples of x ~ 0.46-0.78 cannot be isolated through this single crystal
potentiostatic method, which supports the previously proposed explanation to be
surface stabilized phase of significant thermal hysteresis and aging character.
