Lithium-based solid polymer electrolytes by nle13756


									        Lithium-based solid polymer electrolytes

 Paula C. Barbosa, Luísa C. Rodrigues, Maria M. Silva,
                   Michael J. Smith
   Centro de Química, Universidade do Minho, Gualtar,
                 4710-057 Braga, Portugal

Since the pioneering work of Wright [1] and Armand et
al.[2] the complexes formed between alkali metal salts
and poly(ethylene oxide), PEO, generally referred to as
polymer electrolytes, have been the object of a great deal
of research. Originally investigated for use in solid state
batteries, polymer electrolytes may also be incorporated
in thin film, rechargeable batteries, fuel cells,
electrochromic displays, electrochromic windows,
photoelectrochemical cells and chemical sensors. The
advantages of replacing a liquid organic electrolyte with
an immobilized polymer are now widely recognized, and
included improved safety and interfacial properties as
well as ease of battery design and fabrication due to the
plasticity of the components [3]. However, these materials
suffer from a lower conductivity in the solid state than
most liquid, gel, and ceramic electrolytes. Attempts to
increase the ionic conductivity of second generation SPEs
involved the application of various strategies [4],
including the study of a wide variety of elastomeric host
polymers, alternative lithium salts and the use of a range
of conductivity-enhancing additives.
Thin, self-supporting films of electrolyte were prepared
by solvent-casting mixtures with known quantities of
lithium salts and an amorphous polymer host under the
inert atmosphere of dry argon-filled gloveboxes.
Electrolytes were characterized by measurements of
conductivity, cyclic voltammetry, differential scanning
calorimetry and thermogravimetry.


[1] D.E. Fenton, J.M. Parker, P.V. Wright, Polymer 14
(1973) 589.
[2] M.B. Armand, J.M. Chabagno, M.J. Duclot,
Proceedings of the Second International Conference on
Solid Electrolytes, St. Andrews, Scotland, 1978.
[3] F. M. Gray, in Solid Polymer Electrolytes:
Fundamentals and Technological Applications, VCH
Publishers, Inc. (1991).
[4] J.R. MacCallum, C.A. Vincent (Eds.), Polymer
Electrolyte Reviews— 1 and 2, Elsevier, London, 1987
and 1989.

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