With the advent of flexible electronics, flexible electrochemical energy storage and conversion devices have attracted great attention as a promising power source in the emerging field of flexible and wearable electronic devices. [1] Graphene as 2D carbon materials, have high specific surface area, good chemical stability, high electrical and thermal conductivity, and excellent flexibility. Therefore, graphene-based materials can be used as free-standing and binder-free electrodes for flexible electrochemical energy storage and conversion devices. By using the graphene, several kinds flexible electrode were explored.[2-5] A flexible graphene/polyaniline paper was prepared by in situ anodic electropolymerization of polyaniline on a graphene membrane, and it shows a stable large electrochemical capacitance and excellent cyclibility; graphene-cellulose paper membranes were fabricated as freestanding and binder-free electrodes for flexible supercapacitors with good performance. We also developed template-directed chemical vapor deposition to synthesize a three-dimensional interconnected graphene framework. By coating active materials on the graphene framework, an anode and cathode were made to assemble a thin, lightweight and flexible lithium ion battery [6] and lithium sulfur battery. The battery has high rate capability and capacity, and can be repeatedly bent down to <5 mm without failure and degradation of its electrochemical performance.

With the advent of flexible electronics, flexible electrochemical energy storage and conversion devices have attracted great attention as a promising power source in the emerging field of flexible and wearable electronic devices. [1] Graphene as 2D carbon materials, have high specific surface area, good chemical stability, high electrical and thermal conductivity, and excellent flexibility. Therefore, graphene-based materials can be used as free-standing and binder-free electrodes for flexible electrochemical energy storage and conversion devices. By using the graphene, several kinds flexible electrode were explored.[2-5] A flexible graphene/polyaniline paper was prepared by in situ anodic electropolymerization of polyaniline on a graphene membrane, and it shows a stable large electrochemical capacitance and excellent cyclibility; graphene-cellulose paper membranes were fabricated as freestanding and binder-free electrodes for flexible supercapacitors with good performance. We also developed template-directed chemical vapor deposition to synthesize a three-dimensional interconnected graphene framework. By coating active materials on the graphene framework, an anode and cathode were made to assemble a thin, lightweight and flexible lithium ion battery [6] and lithium sulfur battery. The battery has high rate capability and capacity, and can be repeatedly bent down to <5 mm without failure and degradation of its electrochemical performance.