The effect of mechanical excitation on performance of polymerbatteries

摘要

The authors present a state-of-the-art report of mechanicalexcitation effects on ionic conductivity of electrolytes, dischargerates and performance of primary polymer batteries, and its relatedimplications. A Li/polymer/Li cell was assembled. The polymerelectrolyte comprised polyethylene oxide (PEO) doped with lithiumtetrafluoroborate (LiBF₄). The data derived from impedancemeasurements on the Li/polymer/Li cell and discharge rate measurementsof a commercially available polymer battery clearly demonstrate theeffects of mechanical excitation on ionic conductivity. The dischargerate of the commercial primary polymer battery was also enhanced whenexcited by an ultrasonic device emitting a mixed frequency in the rangeof 40-400 kHz. The enhanced ionic conductivity of the LiBF₄doped polymer electrolyte and discharge rates of commercially availablebatteries originate from mechanically induced polymer chain motion andits subsequent effect on the motion of charge carriers