Side chain quinone redox reaction effects on conductivity of quinone-PEDOT based conducting redox polymer.

Wang, Huan (författare): Uppsala universitet,Nanoteknologi och funktionella material

Emanuelsson, Rikard (författare): Uppsala universitet,Nanoteknologi och funktionella material

Strömme, Maria, 1970- (författare): Uppsala universitet,Nanoteknologi och funktionella material,Fasta tillståndets fysik

Sjödin, Martin, 1974- (författare): Uppsala universitet,Nanoteknologi och funktionella material,Institutionen för fotokemi och molekylärvetenskap

(creator_code:org_t)

Abstract Ämnesord

Stäng

Conducting redox polymers (CRPs) have attracted increased interest in recent years due to the possibility of combining the favorable electron transport properties of conducting polymers with the additional functionality provided by the redox active pendent group (PG). Herein we present a series of quinone substituted PEDOT-CRPs where the quinone PGs have been substituted by electron-withdrawing substituents. As expected, introducing electron withdrawing substituents leads to an increase of the quinone formal potential making, for example, CF3-substituted CRPs a promising high-voltage cathode material for lithium ion batteries with a well-defined charge/discharge plateau around 3 V vs Li+/Li0 and 67% retention after 200 cycles. Interestingly, we find a shift in conductivity onset potential concomitant with the quinone formal potential shift indicating that the polymer backbone conductance is intimately associated with the PG redox chemistry. Through in-situ UV-vis, EPR and EQCM experiments as well as by experiments in lithium- and tert-butyl-ammonium based electrolyte we show that the conductance delay is caused by the reduced lithiated quinone state, most likely by localizing the polaron charge carrier as indicated by the EPR experiments.

Av författaren/redakt...: Wang, Huan; Emanuelsson, Rik ...; Strömme, Maria, ...; Sjödin, Martin, ...

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