Reactive Separator Promoting In-situ Gel Polymer Formation in the Lithium-Ion Batteries
발표자
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초록
내용
The thermal instability of conventional polyolefin separators and the high flammability of organic electrolytes are the primary safety-related concerns of high-energy-density lithium-ion batteries. To address these issues, reactive alumina particles were coated onto a polyethylene separator to promote the formation of gel polymer electrolyte and enhance the thermal stability of the separator. The three-dimensional network formed by reactive alumina reduced the electrolyte leakage from the cell and enhanced the interfacial adhesion between separator and electrodes. Thermal shrinkage of the reactive alumina-coated separator was also significantly reduced at high temperatures, providing enhanced thermal stability. In addition to improved thermal safety, lithium-ion cells employing a reactive separator exhibited stable cycling at both ambient and high temperatures.