Replacement of flammable liquid electrolytes with gel polymer electrolytes(GPEs)is a promising route to improve the safety of lithium-ion batteries(LIBs).However,polymer-based electrolytes have limited suitability at low/high temperatures due to the instability of the polymer at high temperatures and the low ionic conductivity of the gel state at low temperatures.Herein,an integrated design of electrodes/fibrous GPEs modified with graphene oxide(GO)is reported.Due to the integrated structure of electrodes/GPEs,the strong interface affinity between electrodes and GPEs ensures that the GPEs spun on electrodes do not shrink at high temperatures(160-180℃),thus preventing a short circuit of electrodes.Moreover,after GO modification,oxygen-containing functional groups of GO can accelerate Li^(+)transport of GO-GPEs even at a low temperature of−15℃.When these GPEs are applied to flexible LIBs,the LIBs show excellent electrochemical performance,with satisfactory cycling stability of 82.9%at 1 C after 1000 cycles at 25℃.More importantly,at a high temperature of 160℃,the LIBs can also discharge normally and light the green light-emitting diode.Furthermore,at a low temperature of−15℃,92.7%of its room-temperature capacity can be obtained due to the accelerated Li^(+)transport caused by GO modification,demonstrating the great potential of this electrolyte and integrated structure for practical gel polymer LIB applications.
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