Synthesis and characterization of LiMxMn2-xO4 (M = Al, Bi and Cs ions) films for lithium ion batteries

Autor(es)

Fonseca, C. Polo ^[1] ; Bellei, M. A. ^[1] ; Amaral, F. A. ^[1] ; Canobre, S. C. ^[1] ; Neves, S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Francisco, LCAM, Postgrad Program Stricto Sensu Engn & Mat Sci, BR-13251900 Itatiba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENERGY CONVERSION AND MANAGEMENT; v. 50, n. 6, p. 1556-1562, JUN 2009.
• Citações Web of Science: 12

Resumo

Films of doped LiM(x)Mn(2-x)O(4) (M = Cs, Al and Bi) were deposited on Indium Tin Oxide (ITO) substrate using the Pechini method. X-ray diffraction (XRD) and differential thermal analysis (DTA) were used for structural characterization of the oxides. Their morphology was studied by scanning electron microscope (SEM) and their electrochemical properties by cyclic voltammetry, charge/discharge tests and electrochemical impedance spectroscopy in a 1.0 mol L(-1) LiClO(4)/EC:PC 1:1 (v/v) electrolyte. A single-phase spinel structure was characterized from X-ray patterns of the as-grown films. The best electrochemical performance was obtained with a LiCs(0.02)Mn(1.98)O(4) cathode. After 15 cycles, its specific capacity was 127 mA h g(-1). This value was maintained up to the 30th cycle. The diffusion coefficient value determined by electrochemical impedance spectroscopy was 6.4 x 10(-8) cm(2) s(-1). indicating that electrochemical processes were highly favored on the LiCs(0.02)Mn(1.98)O(4) films. (C) 2009 Elsevier Ltd. 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: 05/56442-5 - Síntese e caracterização de compósitos baseados em óxidos de metais de transição/polimeros condutores
• Beneficiário: Lívia Montanhez
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica