Mixed solid device based on conducting polymer composite and polymer electrolyte

Abstract

Filmes porosos de sílica sol-gel obtidos a partir de tetraetil ortosilicato (TEOS) foram utilizados como moldes para a polimerização eletroquímica da anilina. Foi investigado o comportamento redox e as capacidades de carga/descarga de uma bateria polimérica de lítio constituída pelo compósito polianilina-sílica, utilizado como catodo, e pelo eletrólito gel polimérico poli(dimetilsiloxano-coóxido de etileno). O compósito apresentou uma elevada capacidade inicial (140 mA h g -1 ) e uma capacidade reversível de 75 mA h g -1 após 100 ciclos de carga/descarga. O decréscimo na capacidade específica foi atribuído ao aumento da resistência de transferência de carga e à diminuição do coeficiente de difusão determinados pela espectroscopia de impedância eletroquímica.Tetraethyl orthosilicate (TEOS) derived sol-gel porous films have been utilized as template for the electrochemical polymerization of aniline. Polyaniline-silica composites were obtained and the redox behavior and charge/discharge capacities of a lithium polymeric battery using poly (dimethylsiloxane-co-ethylene oxide) as gel polymeric electrolyte, were investigated. The composite presented a high initial capacity (140 mA h g -1 ) and a reversible capacity of 75 mA h g -1 after 100 charge/discharge cycles. The decrease in the specific capacity was attributed to an increase in charge transfer resistance and a decrease in the diffusion coefficient measured by electrochemical impedance spectroscopy.Keywords: polyaniline, composites, solid polymer electrolyte, batteries IntroductionHistorically the interest in conducting polymers is based on its potential commercial applications, through the promise of a novel combination of lightweight, processibility and electrical conductivity. There was a great deal of initial excitement about conducting polymers as active materials in rechargeable batteries. Due to their low densities, it was thought that batteries with power densities much higher than those of the ordinary lead/acid battery could be readily obtained. Since charge on a polymer backbone is distributed over three or four repeat units, the charge capacity per unit weight for conducting polymers is marginally better than for that of metals.Until recently, polyaniline (PAni) was the electroactive polymer most investigated for battery applications.1,2 Their first major commercial application has been the button cell batteries of Bridge-stone Seiko. 3 The manufacturing cost for other conducting polymers except polyaniline is expensive up to the present. The main characteristics of Li-PAni secondary batteries compared with conventional Li secondary batteries were the longer cyclic life, less selfdischarge rate, endurance to overdischarge, low manufacture cost, and the shape flexibility to making thin films. Since the specific capacity of Li-conducting polymer secondary batteries is small, these are used as back-up power source and for small electronic devices.Many investigations have been concerned with the possibility of applying polyaniline to solid-state recharge...

Conducting-polymer-based supercapacitor devices and electrodes

“…Polyaniline has been studied extensively as a supercapacitor or battery electrode material [11,15,19,27,42,44,49,50,53,[55][56][57][58][59][60][61][62][63][64][65][66][67][68]. The structure of polyaniline is illustrated in Fig.…”

Conducting polymer‐based flexible supercapacitor

“…Polyaniline (PAn) is one of the most promising conducting polymer which has been frequently used as a low-cost positive electrode material for ES application due to its variable oxidation state, and excellent doping-dedoping characteristic, which contributes to a very high specific pseudocapacitance [68,95,[118][119][120][121][122][123][124][125][126][127][128][129]. Although the protonated emeraldine form of polyaniline has reported to have very poor conductivity, it is one of the most studied CPs due to its high doping level and environmental stability [68,130].…”

Recent Advances in the Application of Natural Fiber Based Composites

“…This showed photoelectric behavior, where the conductivity of the polymer increased when supported with cellulose membrane, although the complete mechanism of this behavior was not entirely understood. [73,74] To demonstrate the applicability of cellulose as a smart electro-active material, a bending actuator was processed, fabricated and tested using cellulose paper by Kim et al [75] The concept of electroactive papers is demonstrated in Figure 3, which shows the cellulose electroactive paper as a bending actuator. Gold electrodes were deposited on both sides of the cellophane by means of physical vapor deposition.…”

“…Composite films, demonstrating acceptable conductivity, were obtained by the electropolymerization of aniline on a platinum electrode coated with a microporous cellulose acetate membrane. This showed photoelectric behavior, where the conductivity of the polymer increased when supported with cellulose membrane, although the complete mechanism of this behavior was not entirely understood 73, 74. To demonstrate the applicability of cellulose as a smart electro‐active material, a bending actuator was processed, fabricated and tested using cellulose paper by Kim et al75 The concept of electroactive papers is demonstrated in Figure 3, which shows the cellulose electroactive paper as a bending actuator.…”