火焰燃烧制备纳米氧化铝及其在锂电池隔膜涂覆中的应用研究
Preparation of nano-alumina by flame spray pyrolysis and application in separator coating for lithium-ion batteries
Nano-sized alumina with high dispersivity is synthesized via flame spray pyrolysis (FSP) method,and characterized by means of X-ray diffraction (XRD),transmission electron microscopy (TEM),and dynamic light scattering (DLS).Taking the prepared nano-alumina as the coating material,a thin layer of alumina is evenly deposited onto commercial polyethylene (PE) separator via a straightforward wire-bar coating method.Morphological structure,physicochemical performances,and electrochemical properties of the coated separator are thoroughly examined.Notably,the nano-alumina/PE coating separators exhibit substantial enhancements in areal density,porosity,electrolyte wettability,thermal stability and mechanical strength.NCM811 coin cells assembled with the nano-alumina/PE coating separators presents a discharge capacity of 154.3 mAh/g at a high rate of 5 C,and exhibits a capacity retention of 91.4% after 200 cycles at 1C,showcasing their superior electrochemical performance.
aluminium oxide / coated separator / lithium-ion batteries / flame spray pyrolysis
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国家自然科学基金(22378128)
国家自然科学基金(22108079)
国家自然科学基金(U22B20143)
国家自然科学基金(U22A20429)
上海市技术委员会项目(22dz1205900)
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