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:In order to apply hybrid capacitor, Li 2 Mn 3 O 7 was synthesized by combustion method using LiNO 3 , Li(CH 3 COO)·2H 2 O and Mn(CH 3 COO) 2 ·4H 2 O. Spinel pattern was identified the samples calcined over 400 o C in XRD. Intensity of Mn 2 O 3 peak increased as the calcination temperature increased. To decide n/p ratio and to investigate electrochemical properties, charge-discharge tests of Li/ Li 2 Mn 3 O 7 and Li/AC half-cell were carried out. Applying to AC/Li 2 Mn 3 O 7 hybrid capacitor, it had high discharge capacitance of 32.8 F/cc at 100 mA/g.

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