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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/35258
Título: 
Quantitative structural analysis of the transition from LT-LixCoO2 to HT-LixCoO2 using the rietveld method: correlation between structure and electrochemical performance
Autor(es): 
Instituição: 
  • Universidade Federal de São Carlos (UFSCar)
  • Univ Estadual Ponta Grossa
  • Universidade Estadual Paulista (UNESP)
ISSN: 
0378-7753
Resumo: 
A quantitative phase analysis was made of LiXCoO2 powders obtained by two distinct chemical methodologies at different temperatures (from 400 to 700degreesC). A phase analysis was made using Rietveld refinements based on X-ray diffraction data, considering the LiXCoO2 powders as a multiphase system that simultaneously contained two main phases with distinct, layered and spinel-type structures. The sults showed the coexistence of both structures in LiXCoO2 obtained at low temperature (400 and 500degreesC), although only the layered structure was detected at higher temperatures (600 and 700degreesC, regardless of the chemical powder process employed. The electrochemical performance, evaluated mainly by the cycling reversibility of LiXCoO2 in the form of cathode insertion electrodes, revealed that there is a close correlation between structural features and the electrochemical response, with one of the redox processes (3.3 v/3.9 v) associated only with the presence of the spinel-type structure. (C) 2003 Elsevier B.V. All rights reserved.
Data de publicação: 
2-Jan-2004
Citação: 
Journal of Power Sources. Amsterdam: Elsevier B.V., v. 125, n. 1, p. 103-113, 2004.
Duração: 
103-113
Publicador: 
Elsevier B.V.
Palavras-chaves: 
  • LixCoO2
  • Rietveld method
  • X-ray structural refinement
  • insertion electrodes
  • lithium battery
Fonte: 
http://dx.doi.org/10.1016/j.jpowsor.2003.07.016
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/35258
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