“…In fact, a grayish-brown LiCoO 2 thin film has recently been prepared on a white membrane. 14 In the present experimental condition, the growth of the thinfilm-like LiCoO 2 crystals located on the LiCl melt/air interface can be explained by the heterogeneous nucleation of LiCoO 2 at the interface. At 1173 K, the evaporation of LiCl and CoCl 2 facilitates the rapid growth of LiCoO 2 crystals, accompanied by the oxidation of Co 2+ to Co 3+ by atmospheric oxygen, as reported previously in the case of Mn.…”