Electrochemical synthesis of composite films of manganese dioxide and polypyrrole and their properties as an active material in lithium secondary batteries
- Osaka Univ., Suita (Japan). Dept. of Applied Chemistry
Composite films of polypyrrole and {beta}-MnO{sub 2} or lithiated MnO{sub 2} (Li-MnO{sub 2}) particles have been synthesized for use as cathode-active materials of rechargeable lithium batteries. The composite films were prepared by electrolysis of pyrrole dissolved in propylene carbonate solution in the presence of suspended MnO{sub 2} particles. The maximum amount of the incorporation of MnO{sub 2} was 50.2 and 40.6 weight percent for {beta}-MnO{sub 3} and Li-MnO{sub 2}, respectively. It was found that both polypyrrole and the incorporated MnO{sub 2} worked as the active material with one potential plateau in the charge-discharge test conducted in a mixed solution of propylene carbonate and dimethoxyethane in which LiClO{sub 4} was dissolved. Furthermore, it was shown that polypyrrole worked as a conducting network for the incorporated MnO{sub 2}. Though the utilization of the incorporated MnO{sub 2} was not high ({beta}-MnO{sub 2} and Li-MnO{sub 2} gave 0.23 and 0.57, respectively), the composite films prepared under optimal electrolysis conditions gave the specific energy density on volume basis of more than 150% of that obtained for a fully-utilized MnO{sub 2}-free polypyrrole. Elemental analysis of the composite films revealed that electrolyte anions alone were involved in the redox reaction of polypyrrole of the composite films and Li{sup +} ions in the redox reaction of the incorporated MnO{sub 2}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 142202
- Journal Information:
- Journal of the Electrochemical Society, Vol. 141, Issue 1; Other Information: PBD: Jan 1994
- Country of Publication:
- United States
- Language:
- English
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