There is growing interest in thin, lightweight and flexible energy storage device to meet the various special designs and power sources for next-generation flexible electronics, such as roll-up display, RFID tag and wearable devices. Using soft and flexible nano-sized materials, such as nanotube or nanofiber, initial strides in thin, flexible batteries have been shown. Graphene, a unique two-dimensional carbon material, has many excellent properties, such as high specific surface area, good chemical stability, high electrical and thermal conductivity, high mechanical properties, and excellent flexibility. Therefore, graphene and its composite materials are expected to be used in high-performance energy storage devices. Because of the good flexibility of graphene, flexible graphene-based materials can be fabricated and used as freestanding and binder-free electrodes for flexible energy storage devices.Here we reported the fabricate, mechanical and electrochemical properties of the graphene based flexible membrane, graphene paper[l], graphene/PANi paper[l], graphene/cellulose paper[2] and graphene foaming composite for supercapacitor and lithium ion battery, which exhibits great advantages as freestanding and binder-free electrodes for flexible energy storage and conversion.
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