The fabrication of the codeposited film electrode of LiCoO
2 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 LiCoO
2 and AB particles in an acetone with I
2 bath showed positive charge. The binder-free codeposited film consisting of LiCoO
2 and AB particles was cathodically electrodeposited on an Al substrate in the acetone with I
2 bath including their particles. The LiCoO
2 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.
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