文摘
Lithium cobalt phosphate, LiCoPOub>4ub>, has attracted much attention as a high voltage cathode material in lithium-ion batteries (LIBs). Since this material suffers from very low ion and electron conductivities, the composite structure made with nano-sized LiCoPOub>4ub> and carbon can be effectively used as a cathode material. Here, we report a simple mechanical synthesis route for preparing LiCoPOub>4ub>/C composite granules. The raw materials for LiCoPOub>4ub> and carbon were mechanically treated with an attrition-type mill for producing LiCoPOub>4ub>/C composite granules using a one-step process without employing external heating. With an increase in the amount of carbon used, the primary particle size of LiCoPOub>4ub> and the median size of granules were decreased. The first discharge capacity obtained for the LiCoPOub>4ub>/C prepared with 5 mass% carbon was 105 mA h gup>−1up>, whereas a value of up to 134 mA h gup>−1up> was obtained for the composite with 10 mass% carbon. We examined the effect of carbon addition on the mechanical synthesis and characteristics of LiCoPOub>4ub> powders.
