Composite Nanofiber Membrane for Lithium Ion Batteries Prepared by Electrostatic Spun/Spray Deposition

Abstract

A new kind of sandwiched composite membrane (SCM) for lithiumion batteries is prepared by depositing zirconia microparticle between two layers of electrospun poly(vinylidene fluoridecohexafluoropropylene) (PVdFHFP) nanofibers by electrostatic spray deposition. The thermal shrinkage, electrochemical properties of the separator, and cycle performance for batteries with the SCM were investigated. The results show that the SCM has a high electrolyte uptake and easily absorbs electrolyte to form gelled polymer electrolytes (GPEs). The SCM GPEs have a high ionic conductivity of up to 2.06 أ— 10−3 S cm−1 at room temperature and show a high electrochemical stability potential of 5.4 V. With LiCoCO2 as cathode, the cell with SCM GPEs exhibits a high initial discharge capacity of 149.7 mAh g−1.