Hollow mesoporous silica sphere-embedded composite separator for high-performance lithium-ion battery

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• 作者：Wei Xiao ; Jingjing Wang ; Hong Wang ; Yaqun Gong…
• 关键词：Lithium ; ion battery ; Composite separator ; Hollow silica sphere ; Phase separation ; Electrolyte wettability ; Thermal stability
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：20
• 期：10
• 页码：2847-2855
• 全文大小：1,770 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Analytical Chemistry
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  Condensed Matter
  Electronic and Computer Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1433-0768
• 卷排序：20

文摘

A high-performance composite separator based on hollow mesoporous silica spheres, poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP), and poly(ethylene terephthalate) nonwoven was explored as lithium-ion battery separator via a dip coating technique followed by a phase separation wet process. Systematical investigations including morphology characterization, porosity measurement, electrolyte wettability, thermal shrinkage testing, and cell performance examination are carried out. It is demonstrated that the unique mesoporous structures of silica spheres endow the composite separator with well-defined microporous structure. Owing to the preferable microstructure and relatively polar constituents, the composite separator exhibits higher porosity, superior electrolyte wettability, and outstanding thermal stability. Based on the above advantages, the composite separator shows better electrochemical performances, such as the discharge C-rate capability and cycling performance, as compared to the commercialized PE separator. This research presents a simple approach to prepare high-performance separator, which is demonstrated to be a good candidate for lithium-ion batteries.