Physical and electrochemical chattels of phosphonium ionic liquid-based solid and gel-polymer electrolyte for lithium se
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Physical and electrochemical chattels of phosphonium ionic liquid-based solid and gel-polymer electrolyte for lithium secondary batteries R. Muthupradeepa1,2, M. Sivakumar1,* , R. Subadevi1, V. Suriyanarayanan3, M. Ramachandran1,4, P. Rajkumar1, and R. Yuvakkumar1 1
#120, Energy Materials Lab, Department of Physics, Alagappa University, Science Block, Karaikudi, Tamil Nadu 630003, India Sree Sastha Institute of Engineering and Technology, Chennai, Tamil Nadu 600123, India 3 Electro-Organic Division, Central Electrochemical Research Institute, Karaikudi, Tamil Nadu 630 006, India 4 Department of Physics, Arumugam Pillai Seethai Ammal College, Tiruppathur, Tamil Nadu 630211, India 2
Received: 25 July 2020
ABSTRACT
Accepted: 3 November 2020
In this work, a methodical study on the influence of ionic conductivity on polymer electrolyte with different weight percentages of ionic liquid and plasticizers had been investigated in detail. Solution casting method has been employed for preparing polymer electrolyte (PE) blend having poly(vinylidenefluoride-co-hexafluoropropylene) P(VdF-co-HFP) as polymer, trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl) amide [P14,6,6,6][Tf2N] as ionic liquid and ethylene carbonate (EC) as well as propylene carbonate (PC) in 1: 1 ratio as plasticizers. The polymer electrolyte has been found out stable up to 450 °C, as measured from Thermal gravimetric analysis (TGA). Impedance spectral analysis reveals that the ionic conductivity of SPEs is 3.209 9 10–6 S/cm at 303 K with 25 wt% of ionic liquid. The addition of plasticizers (EC ? PC (60 wt%)) results in two orders of magnitude of higher ionic conductivity (3.40 9 10–4 S/cm at 303 K), than that of SPEs. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) are performed to study the physico-chemical characteristics of polymer electrolytes. Electrochemical stability, potential window and discharge characteristics of the coin cell containing the electrolytes and LiFePO4 electrode were investigated using linear and cyclic voltammetry.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
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https://doi.org/10.1007/s10854-020-04820-7
J Mater Sci: Mater Electron
1 Introduction The lithium batteries are the utmost choice for high energy consuming devices because of their properties which relate to their high working voltage, high energy density, long cycle life, better mechanical property and size effective [1–3]. Electrolytes with electro active properties such as ionic conductivity, electro chemical window, cyclic shall play a vital role in electrochemical devices. Electrolytes belonging to polymer electrolytes have higher conductivity, high thermal and mechanical stability, wide electro chemical window and so on [4–6]. Whereas Organic electrolytes as well as solid polymer electrolytes fails in these properties such as flammability, volatility, lithium dendrites, leak
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