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Electrospun Poly(vinylidene fluoride)-Lithium Bistrifluoromethanesulfonamide Separators for Applications in Ionic Liquid Batteries
Yen Bach
Truong A C,
Pon
Kao B,
Ilias Louis
Kyratzis A,
Chi
Huynh A,
Florian H. M.
Graichen A,
Anand I.
Bhatt B and
Adam S.
Best B
A
CSIRO Materials Science and Engineering, Private Bag 10, Clayton South, Vic. 3169, Australia.
B
CSIRO Energy Technology, Box 312, Clayton South, Vic. 3169, Australia.
C
Corresponding author. Email: Yen.Truong@csiro.au
Australian Journal of Chemistry
66(2)
252-261 http://dx.doi.org/10.1071/CH12392
Submitted: 22 August 2012 Accepted: 26 October 2012 Published:
11
December
2012
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Abstract
In batteries the separator plays a crucial role within the cell. Commercially available separators, e.g. polyolefins, glass fibres, or polyolefins with ceramic coatings, do not have ideal compatibility with ionic liquid (IL) electrolytes. In this study, we report on the use of electrospinning to fabricate poly(vinylidene fluoride) (PVDF) membranes for use with IL electrolyte based batteries. Four electrospun membranes have been prepared; a neat PVDF, PVDF doped with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), and two LiTFSI-doped membranes based on either thermal or UV cross-linking. The membranes were characterised by a number of techniques and the key characteristics of all electrospun membranes included small fibre sizes and high porosity. The tensile strengths of the cross-linked membranes approached those of commercial membranes. Electrochemical performance was measured using coin cell cycling and the thermally cross-linked membrane gave the lowest cell overpotential as well as the lowest cell resistance. 
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