Effect of polymerization anion on electrochemical properties of polypyrrole and on Li/LiClO/sub 4//polypyrrole battery performance

Journal Article · Sun May 01 00:00:00 EDT 1988 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2095877· OSTI ID:6750989

Osaka, T; Naoi, K; Ogano, S

Electrochemical doping-undoping kinetics of electropolymerized polypyrrole (PPy) and the charge-discharge characteristics of Li/LiClO/sub 4//PPy battery were found to show an interesting dependency on the kind of anions used for the preparation of PPy film. The relationship between the doping charge (anodization charge estimated from cyclic voltammogram) of PPy film and the polymerization potential revealed that the optimum potential for getting the largest doping capacity depends strongly on the kind of anions. The optimum potential for PF/sub 6//sup -/ - and CF/sub 3/SO/sub 3/ -formed PPy films was 0.32V vs/ Ag/Ag/sup +/. On the other hand, ClO/sub 4//sup -/ -formed PPy film had the largest doping charge at 0.84V preparation over an examined potential range (0.30-0.84V). An appropriate polymerization scheme was discussed on the assumption that the presence of electron donating species (electrolyte anions) may stabilize a radical cation intermediate, by which the follow-up reaction to yield a polymeric film is favored. The postulated polymerization scheme is supported by the results of cross-sectional SEM micrographs of various anion formed PPy films. The charge-discharge characteristics of Li/LiClO/sub 4//PPy (formed at the optimal potential) batteries were also investigated, in an attempt to clarify the relationship between battery performance and basic electrochemical behavior of the PPY electrode. From observing the charge-discharge behavior at various depths of charge and the current densities, the PF/sub 6//sup -/ -formed PPy was confirmed to be superior as a cathode material to the PPy films formed with other anions, viz., ClO/sub 4//sup -/, and CF/sub 3/SO/sub 3//sup -/.

• Research Organization: Dept. of Applied Chemistry, School of Science and Engineering, Waseda Univ., 3-4-1 Okubo, Shinjuku-ku, Tokyo (JP)
• OSTI ID: 6750989
• Journal Information: J. Electrochem. Soc.; (United States), Vol. 135:5
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
LITHIUM-CHLORINE BATTERIES
PERFORMANCE TESTING
ANIONS
ANODES
BORON FLUORIDES
CATHODES
CHLORINE OXIDES
CURRENT DENSITY
DOPED MATERIALS
ELECTROCHEMISTRY
OPTIMIZATION
POLYMERIZATION
SCANNING ELECTRON MICROSCOPY
BORON COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
CHEMISTRY
CHLORINE COMPOUNDS
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTRON MICROSCOPY
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IONS
MATERIALS
METAL-GAS BATTERIES
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
TESTING
250902* - Energy Storage- Batteries- Performance & Testing
400400 - Electrochemistry