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Electrochemical investigation of LiMn2O4 cathodes in gel electrolyte at various temperatures
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0001-9203-9313
2002 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 0019-4686, Vol. 48, no 2, 171-179 p.Article in journal (Refereed) Published
Abstract [en]

A composite lithium battery electrode of LiMn2O4 in combination with a gel electrolyte (1 M LiBF4/24 wt% PMMA/1:1 EC:DEC) has been investigated by galvanostatic cycling experiments and electrochemical impedance spectroscopy (EIS) at various temperatures, i.e. -3 < T < 56 degreesC, For analysis of EIS data, a mathematical model taking into account local kinetics and potential distribution in the liquid phase within the porous electrode structure was used. Reasonable values of the double-layer capacitance, the exchange-current density and the solid phase diffusion were found as a function of temperature. The apparent activation energy of the charge-transfer ( similar to 65 kJ mol(-1)), the solid phase transfer ( similar to 45 kJ mol(-1)) and of the ionic bulk and effective conductance in the gel phase ( similar to 34 kJ mol(-1)), respectively, were also determined, The kinetic results related to ambient temperature were compared to those obtained in the corresponding liquid electrolyte. The incorporated PMMA was found to reduce the ionic conductivity of the free electrolyte, and it was concluded that the presence of 24 wt% PMMA does not have a significant influence on the kinetic properties of LiMn2O4.

Place, publisher, year, edition, pages
2002. Vol. 48, no 2, 171-179 p.
Keyword [en]
lithium batteries, LiMn2O4 cathode, gel electrolyte, temperature, activation energy, secondary lithium batteries, li-ion batteries, polymer electrolytes, intercalation, performance, insertion, kinetics, cells
URN: urn:nbn:se:kth:diva-22034ISI: 000179126300010OAI: diva2:340732
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Lindbergh, Göran
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