TY - GEN
T1 - The study of electronically conducting polymers with highly reversible p- & n-doping
AU - Levi, M. D.
AU - Aurbach, D.
PY - 2006
Y1 - 2006
N2 - Poly[3-(3,4,5)-trifluorophenyl]thiophene (PTFPT) and poly[(2,7-fluoren-9- one)-alt-(5,5'-(3,3'-di-n-octyl-2,2'bithiophene))] (PFDO BT-HH, HH=head-to-head) were used to compare the relative stability of their electrochemical p- and n-doping. Both polymers were expected to exhibit an optimized π-electron density in the polymeric backbone of polythiophene either by attaching a pendant (redox-inactive) electron-withdrawing group in the 3-position of the heterocyclic monomer, or by obtaining a co-monomer containing π-conjugated bithiophene and a redox-active subunit. It is shown that PTFPT is sensitive to over-reduction at high cathodic polarizations whereas PFDOBT-HH, in which n-doping occurs in two steps, is much more stable with respect to over-reduction. This is explained by the fact that bithiophene and fluoren-9-one subunits in PFDOBT-HH are conjugated, and hence, the injected negative charge is distributed on both subunits, thus stabilizing the doped polymeric structure. copyright The Electrochemical Society.
AB - Poly[3-(3,4,5)-trifluorophenyl]thiophene (PTFPT) and poly[(2,7-fluoren-9- one)-alt-(5,5'-(3,3'-di-n-octyl-2,2'bithiophene))] (PFDO BT-HH, HH=head-to-head) were used to compare the relative stability of their electrochemical p- and n-doping. Both polymers were expected to exhibit an optimized π-electron density in the polymeric backbone of polythiophene either by attaching a pendant (redox-inactive) electron-withdrawing group in the 3-position of the heterocyclic monomer, or by obtaining a co-monomer containing π-conjugated bithiophene and a redox-active subunit. It is shown that PTFPT is sensitive to over-reduction at high cathodic polarizations whereas PFDOBT-HH, in which n-doping occurs in two steps, is much more stable with respect to over-reduction. This is explained by the fact that bithiophene and fluoren-9-one subunits in PFDOBT-HH are conjugated, and hence, the injected negative charge is distributed on both subunits, thus stabilizing the doped polymeric structure. copyright The Electrochemical Society.
UR - http://www.scopus.com/inward/record.url?scp=45749131764&partnerID=8YFLogxK
U2 - 10.1149/1.2793597
DO - 10.1149/1.2793597
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AN - SCOPUS:45749131764
SN - 9781604239072
T3 - ECS Transactions
SP - 259
EP - 263
BT - ECS Transactions - Lithium-Ion Batteries
PB - Electrochemical Society Inc.
T2 - Lithium-Ion Batteries: Materials and Devices - 210th ECS Meeting
Y2 - 29 October 2006 through 3 November 2006
ER -