High electrochemical performance of nano TiO2 ceramic filler incorporated PVC-PEMA composite gel polymer electrolyte for Li-ion battery applications A Jagadeesan, M Sasikumar, R Hari Krishna, N Raja, D Gopalakrishna, S Vijayashree, P Sivakumar Materials Research Express, 2019 The Gel polymer electrolytes (GPE) exhibit promising performance in the application of Li-ion batteries due to their high ionic conductivity and appreciable Li+ ion transference number. However, the poor interfacial stability between GPE and metallic Li electrode results in undesirable electrochemical performance, which may lead to safety hazards. Herein, we report the fabrication of nanocomposite polymer electrolyte (NCPE) based on PVC (5)-PEMA (25)-EC/DMC (67)—LiClO4 (8) incorporated with hydrothermally derived TiO2 spherical nanoparticles (NPs) as ceramic filler to overcome the above critical issue. The effects of TiO2 NPs on GPEs were systematically investigated by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) thermogravimetric analysis (TGA) and electrochemical analysis. Notably, 5 wt% TiO2 in NCPE remarkably enhanced the ionic conductivity and interfacial properties with metallic Li anode. Besides, 5 wt% TiO2 in NCPE exhibited improved thermal and electrochemical stability with high Li+ ion transference number, all of which are superior to ceramic free GPE. The excellent electrochemical performance can be ascribed to the dispersion of TiO2 spherical NPs, which facilitates the charge carriers and hinders local reorganization of the polymer chains. As a result, the amorphous phase of polymer host can significantly improve, increasing the transportation of Li cation in NCPE. Thus, 5 wt% TiO2 spherical NPs incorporated NCPE is a promising reliable polymer electrolyte cum separator for Li-ion battery applications.
Influence of Hydrothermally Synthesized Cubic-Structured BaTiO3 Ceramic Fillers on Ionic Conductivity, Mechanical Integrity, and Thermal Behavior of P(VDF-HFP)/PVAc-Based Composite Solid Polymer Electrolytes for Lithium-Ion Batteries M. Sasikumar, M. Raja, R. Hari Krishna, A. Jagadeesan, P. Sivakumar, S. Rajendran Journal of Physical Chemistry C, 2018 Solid polymer electrolytes (SPEs) with high ionic conductivity and wide electrochemical window are highly desirable for all-solid-state rechargeable lithium batteries. Herein, we report the use of hydrothermally derived nano-BaTiO3 (BT) as nanofillers in poly(vinyl acetate)/poly(vinylidene fluoride–hexafluoro propylene) and its use as composite SPE (CSPE) for Li-ion batteries. The CSPE was prepared by the solution casting technique and lithium bis-trifluoromethanesulfonylimide is used as salt. The molecular interaction among the various constituents and the surface morphology of the CSPEs were characterized by Fourier-transform infrared spectroscopy and field-emission scanning electron microscopy analysis respectively. BT (7.5 wt %) in CSPE was found to be the optimum composition to obtain a high ion conductivity of 2 × 10–3 S cm–1 at ambient temperature. The CSPE exhibits better mechanical strength (6.9 MPa), wider electrochemical window (5.4 V), and higher lithium transference number (0.48) than SPEs. S...
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