2006 年 74 巻 6 号 p. 474-478
The fabrication of the codeposited film electrode of LiCoO2 and acetylene black (AB) as a binder-free electrode was attempted using the electrophoretic deposition method in order to make a high energy density battery. Based on the ζ-potential measurement, it was found that LiCoO2 and AB particles in an acetone with I2 bath showed positive charge. The binder-free codeposited film consisting of LiCoO2 and AB particles was cathodically electrodeposited on an Al substrate in the acetone with I2 bath including their particles. The LiCoO2 content in the codeposited film was controlled from 68 to 94 wt%. In the cyclic voltammogram of the codeposited film, the oxidation and reduction waves corresponding to the electrochemical intercalation/deintercalation reaction of Li ion were observed. Namely, it was determined that the intercalation/deintercalation reaction of Li ion occurred in the codeposited film. The charge capacity was about 135 mAh g−1 and the discharge capacity was about 125 mAh g−1 when the codeposited film was evaluated as a positive electrode.