Electrospun PI@GO separators for Li-ion batteries: a possible solution for high-temperature operation

Polyimide@graphene oxide (PI@GO) composite fabricated from electrospinning method is evaluated as the separator for Li-ion batteries operated at high temperature. The thermal stability, mechanical properties, and ionic conductivity of PI electrospun separators are improved by using graphene oxide as an enhancer. The operating temperature of the as-prepared separators can be propelled up to 280 °C without evident performance degradation. The LiFePO4/C cell with PI@GO separator can sustain the open circuit voltage up to 60 min at 160 °C, indicating the composite separators are reliable separators for LIBs operated at high temperature.