Semiconductor TiO2 ceramic filler for safety-improved composite ionic liquid gel polymer electrolytes

• Published in: Ionics Vol. 27; no. 5; pp. 2045 - 2051
• Main Authors: Pan, Xiaona, Hou, Qingjie, Liu, Lei, Zhang, Jinqiu, An, Maozhong, Yang, Peixia
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2021; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Electrochemistry; Electrolytes; Energy Storage; Fillers; Flux density; Ion currents; Ionic liquids; Ions; Lithium; Lithium batteries; Mechanical properties; Molten salt electrolytes; Optical and Electronic Materials; Original Paper; Polymers; Product safety; Renewable and Green Energy; Room temperature; Solid electrolytes; Titanium dioxide; Vinylidene; Vinylidene fluoride; Solid-state lithium metal batteries; Safety issues; Mechanical property; Gel polymer electrolytes; Inorganic oxide particles
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-020-03850-9

Gel polymer electrolytes are one of the candidates for solid electrolytes to solve safety issues and improve the energy density of solid-state lithium batteries. Gel polymer electrolyte has high ionic conductivity at room temperature (~ 10 −3  S cm −1 ), but its mechanical properties are poor. Herein, we prepared a series of composite gel polymer electrolytes by N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide, poly(vinylidene fluoride-hexafluoropropylene), LiTFSI, and various inorganic fillers. The addition of 5 wt% TiO 2 can not only increase the ionic conductivity of gel polymer electrolytes but also improve the mechanical properties of gel polymer electrolytes. Besides, as a semiconductor, the TiO 2 has safety risk when uses in composite gel polymer electrolyte. TiO 2 -ILGPE safety is investigated by cyclic voltammetry and battery performance. Additionally, TiO 2 -ILGPE displays a perfect flame-retarding ability, and TiO 2 would not be reduced by the lithium metal anode.