EFFECT OF LIF ADDITION AT PREPARATION OF LICOO2 ON ITS PROPERTIES AS AN ACTIVE MATERIAL OF LITHIUM SECONDARY BATTERY

By adding LiF at the preparation of LiCoO2 from Co(OH)(2) and Li2CO3 a t 900 degrees C, the crystallinity, particle shape and particle size o f LiCoO2 were varied along with the amount of added LiF. The charge/di scharge capacities of LiCoO2 prepared with 1, 3, 5 wt.% of LF were lar ger than that of LiCoO2 without LiF addition. The coulombic efficienci es of charge/discharge process for LiCoO2 prepared with 1, 3, 5, 10 wt .% of LiF were also higher than that of LiCoO2 without LiF addition. T he results indicate that the electrochemical properties of LiCoO2 are improved by LiF addition in the preparation process. (C) 1998 Elsevier Science S.A.