Polymer/ceramic co-continuous nanofiber membranes via room-curable organopolysilazane for improved lithium-ion battery performance

摘要: Polyacrylonitrile (PAN) and ambient temperature-curable organopolysilazane were combined to successfully fabricate PAN/polymer-derived ceramic (PDC) hybrid nanofiber separator using a single-step electrospinning process. The amount of added precursor was varied from 10 30% characterize the effects various loadings on mechanical, thermal properties, electrochemical performance membranes. TEM images reveal that all composite fibers have thin (~5 nm) ceramic-rich sheath layer surrounding each fiber. In addition, there is also present inside fiber with forming continuous network within at high concentrations. interconnected disrupts polymers ability properly crystallize, leading an increase in amorphous regions inclusion. presence surface membrane addition increased leads excellent ionic conductivity cycling performance. 30 wt% PDC sample has 1.05 mS cm−1 compared 0.29 pristine PAN separator. All separators additional content showed initial capacity retention 0.2C charging discharging rate, 90:10, 80:20, 70:30 PAN:PDC showing 89, 90 93% graphite/LiCoO2 full cells over 100 cycles, respectively. rate capability testing, PAN/PDC demonstrated even charge rates. results suggest wetting behavior by both ceramics are more correlated than porosity.