Preparation and characterization of Guar gum-based solid biopolymer electrolyte doped with lithium bis(trifluoromethanes
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Ó Indian Academy of Sciences Sadhana(0123456789().,-volV)FT3 ](0123456789().,-volV)
Preparation and characterization of Guar gum-based solid biopolymer electrolyte doped with lithium bis(trifluoromethanesulphonyl)imide (LiTFSI) plasticized with glycerol M ABIRAMI, R SARATHA, R SHILPA*
and B VINITHA
Department of Chemistry, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore 641043, India *Author for correspondence ([email protected]) MS received 21 November 2019; accepted 25 March 2020 Abstract. The Guar gum (GG)–lithium bis(trifluoromethanesulphonyl)imide (LiTFSI)-glycerol-based solid biopolymer electrolyte has been investigated. The polymer electrolytes has been prepared via solution casting technique and characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), 3D-laser profilometry and AC impedance studies. The amorphous nature and complexation has been revealed by XRD and FTIR. TGA reveals that the polymer electrolyte is stable up to 260°C. The average roughness was measured using 3D-laser profilometry. The ionic conductivity of the electrolyte was studied using impedance analysis. The best optimum ionic conductivity of 2.041 9 10-3 S cm-1 has been achieved for the film containing 60 wt% GG–40 wt% LiTFSI. Keywords.
1.
Biopolymer; LiTFSI; XRD; FTIR; TGA; AC impedance studies.
Introduction
Throughout the recent past, solid polymer electrolytes (SPEs) i.e., polymer–salt complexes have gained more attention owing to their potential applications in many electrochemical devices for example batteries, chemical sensors, photo-electrochemical cells, smart windows etc. SPEs have numerous advantages such as mechanical strength, free from leakage, good electrode–electrolyte contact, ease of fabrication into thin film, electrochemical stability and high energy density [1–4]. Moreover, the limitations of liquid electrolytes (poor chemical stability, reaction with electrodes and leakage) can overcome by SPEs [5]. A number of SPEs have been synthesized and characterized using synthetic polymers that include PVdFHFP, PMMA, PAN, PEO, PPO, PEG etc. [6,7]. Currently, our globe is facing many challenges as a result of the environmental issues. On the other hand, synthetic polymers also pose challenges like high cost, nonbiodegradability and insolubility in solvents [3,5]. Research studies have focussed on biopolymer electrolytes which are obtained from natural polymers. Natural polymers can overcome many challenges due to their non-toxicity, abundance in nature, eco-friendliness, renewability and biodegradability [8]. Ahmad Khiar and Arof [9] reported conductivity of 2.83 9 10-5 S cm-1 for starch/NH4NO3
system. The carboxymethyl cellulose/NH4Br system was prepared by Samsudin and Saadiah [10] and achieved conductivity of 3.31 9 10-3 S cm-1. The conductivity of 6.1 9 10-4 S cm-1 was obtained for I-carrageenan/magnesium nitrate system [11]. The conductivity of 2.08 9 10-3 S cm-1 for pectin/LiCl system was reported by Perumal et al [12].
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