Electrochemical evaluation of LiCoO_2 synthesized by decomposition and intercalation of hydroxides for lithium-ion battery applications

摘要

LiCoO_2 has been synthesized by a solid-state synthesis route involving the decomposition and intercalation of hydroxide precursors generated by precipitation and freeze-drying. Cyclic voltammetry of LiCoO_2 obtained by heating at 100 ℃ for 2 h has shown this material to be electrochemically active with an initial discharge capacity of 92 mA h g~(-1). Optimization of processing conditions reduced the firing time to as little as 2 h at 800 ℃, producing LiCoO_2 powders with high reversible capacity (142 mA h g~(-1)), good rate capability, and good cyclability. The favourable performance of this oxide powder in LiCoO_2/C lithium-ion cells using the present oxide powders shows the instant synthesis route to be promising and cost-effective for lithium-ion battery applications.