A LiMnO2-PAn-DMcT composite cathode for a lithium polymer battery (LPB) was developed. We investigated impedance spectroscopy, electrochemical properties of LiMnO2, LiMnO2-PAn and LiMnO2-PAn-DMcT composites with polyvinylidene (PVDF)-based polymer electrolyte as a function of mixing ratio. The capacity of LiMnO2 with 3 wt.% PAn-12 wt.% SP270 was higher than that of LiMnO2 with 15 wt.% SP270. The discharge capacity of LiMnO2-PAn with 3 wt.% PPy was 119 and 121 mAh/g at 7 and 15 cycles. The capacity of LiMnO2 with 2 wt.% PAn and 3 wt.% DMcT was higher than that of LiMnO2 with 3 wt.% PAn and 12 wt.% SP270 with cycling. The LiMnO2-PAn-DMcT composite cathode with 2 wt.% PAn and 3 wt.% DMcT in PVDF-based electrolyte shows good capacity with cycling. (C) 2003 Elsevier Science B.V. All rights reserved.