Electrochemical performance evaluation of polyaniline/lithium manganese nickel oxide composites synthesized using surfactant agents

Autor(es)

Neves, Silmara ^[1] ; Canobre, Sheila C. ^[1] ; Oliveira, Rafael S. ^[1] ; Fonseca, Carla Polo ^[1]

Afiliação do(s) autor(es)

^[1] Univ San Francisco, LCAM, BR-13251900 Itatiba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Power Sources; v. 189, n. 2, p. 1167-1173, APR 15 2009.
• Citações Web of Science: 12

Resumo

The effect of adding a non-ionic surfactant to disperse oxide particles on the electrochemical performance of PAni/LiMnNiO(4) composites is evaluated by using cyclic voltammetry (CV), impedance measurements and constant-current charge/discharge cycling techniques. Three surfactants based on ethoxylated (EO) and propoxylated (PO) lauryl alcohols (3EO/6PO, L306; 4EO/5PO, L405; and 6EO/3PO, L603) were investigated. For comparative purposes, the oxide and polyaniline were prepared by sol-gel and chemical methods and were also investigated for their physical and electrochemical performances. By galvanostatic charge-discharge tests, the PAni/LiMnNiO(4) L306 composite showed a better electrochemical performance than each single component and other composites (PAni/LiMnNiO(4) L405 and PAni/LiMnNiO(4) L603). The electrical conductivity of this composite reached 21.7 S cm(-1), and an initial discharge capacity of 198 mAh g(-1) was obtained. After 21 cycles, the retention capacity was 91%. These results indicate a synergistic effect among the materials in the composite. Analytical techniques, such as scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD) and inductively coupled plasma-atomic emission spectrometry (ICP-AES) were also used to characterize the composite materials. (C) 2009 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 06/50967-1 - Sintese e caracterizacao de compositos polimericos obtidos via template.
• Beneficiário: Silmara das Neves
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 05/54578-7 - Desenvolvimento e aplicacao de compositos de polimeros condutores obtidos via sintese template.
• Beneficiário: Sheila Cristina Canobre
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 07/54467-6 - Determinação dos efeitos de agentes dispersantes na síntese dos compósitos PAni/LiMnNiOx
• Beneficiário: Rafael de Souza Oliveira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica