Title: Effect of lithium salt on the properties of PEO based hybrid solid electrolyte for high safety lithium-ion batteries

Authors: Seoung Soo Lee; Hye-Yeong Park; Yeon-Gil Jung; Jae-Kwang Kim; Youngsik Kim

Addresses: School of Advanced Materials Engineering, Changwon National University, 20-1 Changwondaehak-ro, Uichang-gu, Changwon 641-773, South Korea ' School of Advanced Materials Engineering, Changwon National University, 20-1 Changwondaehak-ro, Uichang-gu, Changwon 641-773, South Korea ' School of Advanced Materials Engineering, Changwon National University, 20-1 Changwondaehak-ro, Uichang-gu, Changwon 641-773, South Korea ' Department of Solar and Energy Engineering, Cheongju University, 36 Naedok-dong, Sangdang-gu, Cheongju, Chungbuk 360-764, South Korea ' UNIST, School of Energy and Chemical Engineering, UNIST-gil 50, Ulju-gun, Ulsan, 689-798, South Korea

Abstract: This study firstly reports the properties of a gum-like ceramic-polymer composite electrolyte with different lithium salts, consisting of Li_1.3Ti_1.7Al_0.3(PO₄)₃ (LTAPO) ceramic powder, poly(ethylene oxide) (PEO) polymer and lithium salts. LiCl, LiClO₄, and LiClO₄∙3H₂O are employed as lithium-ion salts to investigate the influence of lithium salt on the gum-like hybrid electrolyte. The morphologies and particle size distribution of the LTAPO ceramic particle are analysed by using a scanning electron microscopy (SEM) and laser particle size analyser. Their crystalline is measured by means of X-ray diffraction (XRD). The influence of the lithium salt on the ionic conductivity is observed by using electrochemical impedance spectroscopy (EIS). The ionic conductivities of the gum-like hybrid electrolyte with different lithium salts are 8.39 × 10^-5, 9.88 × 10^-5 and 6.95 × 10^-5 S/cm for LiCl, LiClO₄, and LiClO₄∙3H₂O, respectively. The highest specific capacity is achieved for LiClO₄ exhibiting a charge capacity of 93 mAh/g and a discharge capacity of 85 mAh/g. Moreover, the hybrid electrolyte with LiClO₄ exhibits higher electrochemical properties. It is shown that the properties of the gum-like hybrid electrolytes were affected by the choice of the Li salt.

Keywords: gum-like composite electrolyte; LTAPO; Li_1.3Ti_1.7Al_0.3(PO₄)₃; PEO; poly(ethylene oxide); sol-gel process; Li-ion batteries.

DOI: 10.1504/IJNT.2018.096352

International Journal of Nanotechnology, 2018 Vol.15 No.6/7, pp.620 - 629

Published online: 26 Nov 2018 *

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