Effect of LiF addition at preparation of LiCoO 2 on its properties as an active material of lithium secondary battery

Abstract

By adding LiF at the preparation of LiCoO 2 From Co(OH) 2 and Li 2CO 3 at 900 °C, the crystallinity, particle shape and particle size of LiCoO 2 were varied along with the amount of added LiF. The charge/discharge capacities of LiCoO 2 prepared with 1, 3, 5 wt.% of LiF were larger than that of LiCoO 2 without LiF addition. The coulombic efficiencies of charge/discharge process for LiCoO 2 prepared with 1,3,5, 10 wt.% of LiF were also higher than that of LiCoO 2 without LiF addition. The results indicate that the electrochemical properties of LiCoO 2 are improved by LiF addition in the preparation process.