Multicore-shell nanofiber architecture of polyimide/polyvinylidene fluoride blend for thermal and long-term stability of lithium ion battery separator

• DOI: 10.1038/srep36977
• Publication Date: 2016-11-11T10:02:45Z
• Authors: Sejoon Park; Chung Woo Son; Sungho Lee; Dong Young Kim; Cheolmin Park; Kwang Sup Eom; Thomas F. Fuller; Han-Ik Joh; Seong Mu Jo
• Keywords: Separator (oil production); Polyvinylidene fluoride; Thermal Stability; Electrospinning; Polyacrylonitrile

Abstract Li-ion battery, separator, multicoreshell structure, thermal stability, long-term stability. A nanofibrous membrane with multiple cores of polyimide (PI) in the shell polyvinylidene fluoride (PVdF) was prepared using a facile one-pot electrospinning technique single nozzle. Unique multicore-shell (MCS) structure electrospun composite fibers obtained, which resulted from phase-separated polymer solution. Multiple PI core fibrils high molecular orientation were well-embedded across cross-section and contributed remarkable stabilities to MCS membrane. Thus, no outbreaks found its dimension ionic resistance up 200 250 °C, respectively. Moreover, (at ~200 °C), as lithium ion battery (LIB) showed superior electrochemical compared widely used commercial separator (~120 °C). The average capacity decay rate LIB for 500 cycles calculated be approximately 0.030 mAh/g/cycle. This value demonstrated exceptional stability LIBs two other types (single core-shell co-electrospun separators incorporating functionalized TiO 2 ) PI/PVdF separators. proper architecture synergy effects nanofibrils thermally stable PVdF electrolyte compatible polymers are responsible performance LIB.