Journal
POWDER TECHNOLOGY
Volume 320, Issue -, Pages 125-132Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2017.07.027
Keywords
Lithium-ion batteries; alpha-Al2O3; Jet-milling; PE separator; Dip coating; Thermal stability
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Funding
- National Research Foundation of Korea [2017R1C1B5017013] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Ultrafine alpha-Al2O3 particles with a high purity of 99.997% and an average size of 300-400 nm were successfully prepared via hydrothermal and jet-milling processes. The jet-milled Al2O3 powders were coated on a conventional polyethylene (PE) separator, and the effects of the Al2O3 particle size on the coating properties of the Al2O3-coated PE separator were investigated. When compared with both the Al2O3-coated PE separator containing unratified particles (D-50 = 3.75 mu m) and the PE separator, the Al2O3-coated PE separator incorporating the jet milled particles (D-50 = 037 mu m) exhibited a high porosity (60-63%) and a high electrolyte uptake (243-245%). The cell with the Al2O3-coated PE separator showed a similar rate capability and cycling performance at room temperature compared with the PE separator. Regarding the thermal behavior, the Al2O3-coated PE separator has a lower enthalpy, lower thermal shrinkage, and improved melt integrity compared with the pristine PE separator. (C) 2017 Elsevier B.V. All rights reserved.
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