Phys. Rev. Lett. 84, 5536 - 5539 (2000)Structure of Liquid PEO-LiTFSI Electrolyte |
PRL Celebrates 50 Years
This Week's Milestone Letters are from 1984: |
Guomin Mao, Marie-Louise Saboungi, and David L. Price
Argonne National Laboratory, Argonne, Illinois 60439
Michel B. Armand
Department of Chemistry, University of Montreal, Montreal, Canada QC H3C 3J7
W. S. Howells
Rutherford-Appleton Laboratory, Chilton, Oxon OX11 0QX, United Kingdom
Received 8 December 1999
The structure of a polymer electrolyte, P(EO)7.5LiN(SO 2CF 3)2, has been determined by neutron diffraction with isotropic substitution. The Li ions are bonded on average to five ether oxygens belonging to pairs of PEO coils. These are arranged with a considerable degree of extended-range order providing pathways for the Li ion conduction. The lack of ion pairing in this system below 4.8 Å is reminiscent of that observed in the remarkable structure of P(EO)6LiAsF 6 and implies that anions and cations are free to migrate independently.
©2000 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v84/p5536
DOI: 10.1103/PhysRevLett.84.5536
PACS: 61.20.Qg
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