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Title: The influence of water on the cycling behavior of the polypyrrole electrode in lithium cells

Abstract

Two different types of polypyrrole (PPy) have been synthesized: the dry form from 0.2{ital M} pyrrole (Py) + 0.5{ital M} LiClO{sub 4} propylene carbonate (PC) and the wet one from 0.2{ital M} Py + 0.56{ital M} H{sub 2}O + 0.5{ital M} LiClO{sub 4} in PC. The polymerization of pyrrole in both electrolytes starts at + 3.46 V ({ital vs}. Li/Li{sup +}) and follows nearly the same {ital E-I} curve. During the first discharge clear differences in electrochemical behavior can already be seen. During the first 1,000 cycles performed on 1-{mu}m thin PPy layers in the dry 0.5{ital M} LiClO{sub 4} (PC) electrolyte, the coulombic capacity of the dry form of PPy dropped to about 80% of its initial value. The cycling behavior of the wet form is even better---the doping level is slightly higher and the capacity drops to 80% of its initial value after more than 20,000 cycles, when cycled in the optimum potential interval from 2.0 to 4.0 V ({ital vs}. Li/Li{sup +}). Cyclic voltammograms and {ital in situ} FTIR measurements revealed that there is a gradual, slight loss of the most negative redox sites with increasing cycle number, accompanied by an increase in the amount of themore » irreversibly (over)oxidized PPy found in the neutral form of the polymer. The self-discharge loss on {approx} 50-{mu}m-thick PPy foils was found to be about 1% per day.« less

Authors:
;  [1]
  1. Bonn Univ. (Germany, F.R.). Inst. fuer Physikalische und Theoretische Chemie
Publication Date:
OSTI Identifier:
6731180
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society; (USA)
Additional Journal Information:
Journal Volume: 137:4; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; LITHIUM; ELECTRIC BATTERIES; PYRROLES; POLYMERIZATION; ELECTRODES; ENERGY LOSSES; INFRARED SPECTRA; PERFORMANCE TESTING; SOLID ELECTROLYTES; WATER INFLUX; ALKALI METALS; AZOLES; CHEMICAL REACTIONS; ELECTROCHEMICAL CELLS; ELECTROLYTES; ELEMENTS; HETEROCYCLIC COMPOUNDS; LOSSES; METALS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; SPECTRA; TESTING; 250902* - Energy Storage- Batteries- Performance & Testing; 400400 - Electrochemistry

Citation Formats

Novak, P, and Vielstich, W. The influence of water on the cycling behavior of the polypyrrole electrode in lithium cells. United States: N. p., 1990. Web. doi:10.1149/1.2086600.
Novak, P, & Vielstich, W. The influence of water on the cycling behavior of the polypyrrole electrode in lithium cells. United States. doi:10.1149/1.2086600.
Novak, P, and Vielstich, W. Sun . "The influence of water on the cycling behavior of the polypyrrole electrode in lithium cells". United States. doi:10.1149/1.2086600.
@article{osti_6731180,
title = {The influence of water on the cycling behavior of the polypyrrole electrode in lithium cells},
author = {Novak, P and Vielstich, W},
abstractNote = {Two different types of polypyrrole (PPy) have been synthesized: the dry form from 0.2{ital M} pyrrole (Py) + 0.5{ital M} LiClO{sub 4} propylene carbonate (PC) and the wet one from 0.2{ital M} Py + 0.56{ital M} H{sub 2}O + 0.5{ital M} LiClO{sub 4} in PC. The polymerization of pyrrole in both electrolytes starts at + 3.46 V ({ital vs}. Li/Li{sup +}) and follows nearly the same {ital E-I} curve. During the first discharge clear differences in electrochemical behavior can already be seen. During the first 1,000 cycles performed on 1-{mu}m thin PPy layers in the dry 0.5{ital M} LiClO{sub 4} (PC) electrolyte, the coulombic capacity of the dry form of PPy dropped to about 80% of its initial value. The cycling behavior of the wet form is even better---the doping level is slightly higher and the capacity drops to 80% of its initial value after more than 20,000 cycles, when cycled in the optimum potential interval from 2.0 to 4.0 V ({ital vs}. Li/Li{sup +}). Cyclic voltammograms and {ital in situ} FTIR measurements revealed that there is a gradual, slight loss of the most negative redox sites with increasing cycle number, accompanied by an increase in the amount of the irreversibly (over)oxidized PPy found in the neutral form of the polymer. The self-discharge loss on {approx} 50-{mu}m-thick PPy foils was found to be about 1% per day.},
doi = {10.1149/1.2086600},
journal = {Journal of the Electrochemical Society; (USA)},
issn = {0013-4651},
number = ,
volume = 137:4,
place = {United States},
year = {1990},
month = {4}
}