Sol-gel synthesis and electrochemical properties of c-axis oriented LiCoO2 for lithium-ion batteries

摘要

To improve the performance of LiCoO2 as a cathode for lithium-ion batteries, the electrochemical properties of c-axis oriented LiCoO2 were studied. LiCoO2 samples with controllable intensity ratios of peak (003) to peak (104) were synthesized via a resorcinol-formaldehyde sol-gel method, followed by an air-controlled high temperature treatment. Electrochemical measurements showed that LiCoO2 with a low degree of c-axis orientation exhibited better performance than LiCoO2 with a high degree of c-axis orientation. X-ray absorption spectroscopy was used to reveal the texture-property relationship between the different products. The variances could be attributed to the different electrochemical active sites created and the diffusion lengths for the lithium ions related to c-axis orientation.