Electrochemical properties of LiCoO2 thin film electrode prepared by ink-jet printing technique

LiCoO2 thin film electrodes with a thickness of about 1.2 mu m were fabricated by an improved ink-jet printing method. LiCoO2 powder was synthesized via a modified sol-get method. The LiCoO2 ink could be easily prepared by an ultrasonic dispersion technique using a commercially available surfactant. The jet printing LiCoO2 thin films were characterized by X-ray diffraction and Raman spectroscopy, scanning electron microscopy, cyclic voltammetry, charge/discharge cycling and electrochemical impedance spectroscopy. Experimental results showed that the LiCoO2 thin film electrodes present excellent cycling performance at high discharge rate. At discharge current density of 180 mu A/cm(2) (at this current density.. the battery can be fully discharged in 12 min), the initial discharge capacity was 120 mAh/g, and after 100 charge-discharge cycles, the capacity loss was only 5%. It can be even charge-discharged at the current density as high as 384 mu A/cm(2). (c) 2007 Elsevier B.V. All rights reserved.