Nanocomposite: Crosslinked by Electron Beam Irradiation

Preparation of Nanocomposite y-Al2O3/polyethylene separator crosslinked by electron beam irradiation for lithium secondary battery.

This article describes advanced research related to the use of electron beam processing for the development of advanced materials for technological applications. The article was published on-line in Radiation Physics and Chemistry.

Authors: GiorgianaYoung-Chang Nho, Joon-Yong Sohn, Junwa Shin, Jong-Seok Park, Yoon-Mook Lim, Phil-Hyun Kang Research Division for industry & Environment, Advanced Radiation Technology Institute, Korea Atomic; Energy Research Institute, 29 Geumgu-gil, Jeongeup-si, Jeollabuk-do 56212, Republic of Korea

Abstract. Although micro-porous membranes made of polyethylene (PE) offer excellent mechanical strength and chemical stability, they exhibit large thermal shrinkage at high temperature, which causes a short circuit between positive and negative electrodes in cases of unusual heat generation. We tried to develop a new technology to reduce the thermal shrinkage of PE separators by introducing γ-Al2O3 particles treated with coupling agent on PE separators. Nanocomposite γ-Al2O3/PE separators were prepared by the dip coating of polyethylene (PE) separators in γ-Al2O3/poly(vinylidenefluoride-hexafluoropropylene) (PVDF-HFP)/crosslinker (1,3,5-trially-1,3,5-triazine-2,4,6(1 H,3 H,5 H)-trione (TTT) solution with humidity control followed by electron beam irradiation. γ-Al2O3/PVDF-HFP/TTT (95/5/2)-coated PE separator showed the highest electrolyte uptake (157%) and ionic conductivity (1.3 mS/cm). On the basis of the thermal shrinkage test, the nanocomposite γ-Al2O3/PE separators containing TTT irradiated by electron beam exhibited a higher thermal resistance. Moreover, a linear sweep voltammetry test showed that the irradiated nanocomposite γ-Al2O3/PE separators have electrochemical stabilities of up to 5.0 V. In a battery performance test, the coin cell assembled with γ-Al2O3/PVDF-HFP/TTT-coated PE separator showed excellent discharge cycle performance. View article at publisher

Citation: Young-Chang Nho, Joon-Yong Sohn, Junhwa Shin, Jong-Seok Park, Yoon-Mook Lim, Phil-Hyun Kang, Preparation of Nanocomposite y-Al2O3/polyethylene separator crosslinked by electrom beam irradiation for lithium secondary battery, Radiation Physics and Chemistry, Vol. 132 (2017), 65-70. http://dx.doi.org/10.1016/j.radphyschem.2016.12.002

 

First published by the iia in January 2017