Characterization of N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide-based polymer electrolytes for high safety lithium batteries

• Published in: Journal of power sources Vol. 224; no. 15 Feb. 2013; pp. 93 - 98
• Main Authors: Kim, Jae-Kwang, Niedzicki, Leszek, Scheers, Johan, Shin, Cho-Rong, Lim, Du-Hyun, Wieczorek, Wladyslaw, Johansson, Patrik, Ahn, Jou-Hyeon, Matic, Aleksandar, Jacobsson, Per
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.02.2013; Elsevier
• Subjects: Activation; Applied sciences; challenges; conductivity; diffusion; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrodes; Electrolytes; Electrospinning; electrospun; Exact sciences and technology; li-ion batteries; lifepo4 cathode; liquid; Lithium batteries; Matrices; membrane; Membranes; N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)-imide; poly(ethylene oxide); Poly(vinylidene difluoride-co-hexafluoropropylene); Polymer electrolyte; stability; Thermal stability; Electrospinning; Poly(vinylidene difluoride-co-hexafluoropropylene); Lithium batteries; Polymer electrolyte; N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide; Performance evaluation; bis(trifluoromethanesulfonyl)imide; hexafluoropropylene; Alkaline storage battery; Lithium; Activation; Thermal stability; Ionic liquid; Imide; N-butyl-N-methyl-pyrrolidinium; Vinylidene fluoride polymer; Safety; Poly(vinylidene difluoride-co; Iron phosphate; Polymer electrolytes; Ionic conductivity; Polymer; Secondary cell; Crystallinity; Lithium battery; Lithium phosphate; Electrochemical stability; Compatibility; Specific capacity; Room temperature
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2012.09.029

Poly(vinylidene difluoride-co-hexafluoropropylene) (PVdF-HFP) membrane was prepared by electrospinning. The membranes served as host matrices for the preparation of ionic liquid-based polymer electrolytes (ILPEs) by activation with non-volatile, highly thermally stable, and safe room temperature ionic liquid (RTIL) electrolytes; N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide (Py14TFSI) complexed with 1 M lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). In this work, the first combination of electrospun PVdF-HFP fiber polymer host and pyrrolidinium-based ionic electrolyte was employed for highly stable lithium batteries. The ILPE exhibited low Li+–TFSI coordination, low crystallinity, high thermal stability, high electrochemical stability, and high ionic conductivity with a maximum of 1.1 × 10−4 S cm−1 at 0 °C. The ILPE exhibited good compatibility with a LiFePO4 electrode on storage and good charge–discharge performance in Li/ILPE/LiFePO4 cells at room temperature, delivering specific capacities of 143 and 115 mA h g−1 at 0.1 and 1 C-rates. The ILPE also exhibited stable cycle properties and have therefore been demonstrated to be suitable for lithium battery applications. ► PVdF-HFP membrane was prepared by electrospinning. ► Py14TFSI-based gel polymer electrolyte has good physical properties. ► Py14TFSI-based gel polymer electrolyte shows excellent electrochemical properties.