Preparation of nanocomposite γ-Al^sub 2^O^sub 3^/polyethylene separator crosslinked by electron beam irradiation for lithium secondary battery

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 devel...

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Published inRadiation physics and chemistry (Oxford, England : 1993) Vol. 132; p. 65
Main Authors Nho, Young-Chang, Sohn, Joon-Yong, Shin, Junhwa, Park, Jong-Seok, Lim, Yoon-Mook, Kang, Phil-Hyun
Format Journal Article
LanguageEnglish
Published Oxford Elsevier BV 01.03.2017
Subjects
Aluminum oxide
Batteries
Coupling agents
Crosslinking
Electrodes
Electron beams
Electron irradiation
Heat generation
Immersion coating
Ion currents
Lithium batteries
Nanocomposites
New technology
Particle physics
Polyethylene
Polyethylenes
Separators
Shrinkage
Storage batteries
Thermal resistance
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Summary: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.
ISSN:0969-806X
1879-0895