A high thermally stable polyacrylonitrile (PAN)-based gel polymer electrolyte for rechargeable Mg-ion battery
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A high thermally stable polyacrylonitrile (PAN)-based gel polymer electrolyte for rechargeable Mg-ion battery Rupali Singh1,* , S. Janakiraman1, Mohammed Khalifa2, S. Anandhan2, Sudipto Ghosh1, A. Venimadhav3, and K. Biswas1 1
Department of Metallurgical and Materials Engineering, IIT Kharagpur, Kharagpur, West Bengal 721302, India Metallurgical &Materials Engineering, N.I.T.K c, Srinivasanagar, Mangalore, Karnataka 575025, India 3 Cryogenic Engineering Center, IIT Kharagpur, Kharagpur, West Bengal 721302, India 2
Received: 10 July 2020
ABSTRACT
Accepted: 3 November 2020
The ionic conductivity and thermal stability of the electrolyte-separator system is an essential parameter for improving battery performance and safety. The present work addresses the high thermally stable gel polymer electrolyte (GPE) using polyacrylonitrile (PAN) as a polymer membrane and magnesium perchlorate in propylene carbonate (Mg(ClO4)2-PC) as a liquid electrolyte. The PAN based polymer membrane is prepared by electrospinning process which produces a bead free and uniformly distributed nanofibers. The electrospun PAN based GPE is characterized by different physical and electrochemical techniques like X-ray diffraction, field emission scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry, ionic conductivity, linear sweep voltammetry, magnesium ion transference number and electrochemical impedance spectroscopy. The ionic conductivity of PAN is 3.28 mS cm-1, compared to that of PP Celgard is 1.97 9 10–4 mS cm-1 at 30 °C. The electrochemical stability of PAN is 4.6 V and also exhibits excellent interfacial stability with magnesium metal. The results showed that the PAN-based GPE has higher ionic conductivity and thermal stability than the polypropylene (PP) Celgard membrane.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction The lithium-ion batteries (LIBs) are commonly used in electronic devices and electric vehicles. However, LIBs have a lot of drawbacks like short circuits due to
dendrites growth, high cost due to limited Li metal, and safety issues. These drawbacks arise necessity of alternative energy storage devices like Mg, Na, Al, Ca and K-based one [1–3]. The Magnesium-ion batteries (MIBs) can be a better option because magnesium (Mg) metal is naturally abundant thus low cost and
Rupali Singh and S. Janakiraman have contributed equally to this work.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10854-020-04818-1
J Mater Sci: Mater Electron
also highly stable in the normal atmosphere [4–7]. The divalent Mg possesses 2e-, showing a high volumetric capacity of 3833 mAh cm-3 which is much higher compared to monovalent Li metal (2046 mAh cm-3). MIB also showed good theoretical specific capacity of 2205 mAh g-1, electrode potential (- 2.37 V vs. SHE), energy and charge density [8–11]. Due to dendrite growth on the Li metals, it limits the use of Li metal as an anode, whereas Mg metal is safe and it can be used as an anod
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