The Use of Mixed Organic/Ionic Liquid Electrolytes with Forcespun Metal Oxides/Carbon Microfiber Electrodes in Lithium Ion Batteries

Abstract

We present results on the Forcespinning (FS) of Polyacrylonitrile (PAN) solution precursors for the mass production of carbon and SnO2/Carbon composite fibers as anode materials for Lithium-ion batteries. Mixed organic/ionic liquid electrolytes (MOILEs) were employed in Lithium ion cell cycling studies with the carbon fiber and SnO2/C composite fiber anodes to investigate the electrochemical and cycling performance of the Li-ion cells. The carbon fibers cycled with 1 M LiTFSI in 60% EMI-TFSI and 40% EC/DMC (1:1 v/v) with 5 wt% SN electrolyte had a specific capacity of ~201 mAhg-1 at 100 mAg-1 after 100 cycles. Similarly, results were obtained on carbon fibers using 1 M LiPF6 in EC/DMC (1:1 v/v) electrolyte. The SnO2/C composite fibers, with 1 M LiTFSI in 60% EMI-TFSI and 40% EC/DMC (1:1 v/v) with 5 wt% SN, delivered a specific capacity of ~298 mAhg-1 at 100 mAg-1 after 100 cycles.