Lithium-doped plastic crystal electrolytes exhibiting fast ion conduction for secondary batteries

MacFarlane, Douglas R., Huang, Junhua and Forsyth, Maria 1999, Lithium-doped plastic crystal electrolytes exhibiting fast ion conduction for secondary batteries, Nature: international weekly journal of science, vol. 402, no. 6763, pp. 792-794, doi: 10.1038/45514.

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Title Lithium-doped plastic crystal electrolytes exhibiting fast ion conduction for secondary batteries
Author(s) MacFarlane, Douglas R.
Huang, Junhua
Forsyth, MariaORCID iD for Forsyth, Maria
Journal name Nature: international weekly journal of science
Volume number 402
Issue number 6763
Start page 792
End page 794
Publisher Nature Publishing Group
Place of publication London, England
Publication date 1999-12-16
ISSN 0028-0836
Summary Rechargeable lithium batteries have long been considered an attractive alternative power source for a wide variety of applications. Safety and stability1 concerns associated with solvent-based electrolytes has necessitated the use of lithium intercalation materials (rather than lithium metal) as anodes, which decreases the energy storage capacity per unit mass. The use of solid lithium ion conductors - based on glasses, ceramics or polymers - as the electrolyte would potentially improve the stability of a lithium metal anode while alleviating the safety concerns. Glasses and ceramics conduct via a fast ion mechanism, in which the lithium ions move within an essentially static framework. In contrast, the motion of ions in polymer systems is similar to that in solvent-based electrolytes - motion is mediated by the dynamics of the host polymer, thereby restricting the conductivity to relatively low values. Moreover, in the polymer systems, the motion of the lithium ions provides only a small fraction of the overall conductivity2, which results in severe concentration gradients during cell operation, causing premature failure3. Here we describe a class of materials, prepared by doping lithium ions into a plastic crystalline matrix, that exhibit fast lithium ion motion due to rotational disorder and the existence of vacancies in the lattice. The combination of possible structural variations of the plastic crystal matrix and conductivities as high as 2 3 1024 S cm21 at 60 8C make these materials very attractive for secondary battery applications.
Language eng
DOI 10.1038/45514
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©1999, Macmillan Magazines Ltd
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