Electrochemically exfoliation of graphene-glass fiber integrated with electrode anode for lithium-ion batteries

초록

Recently, as the markets for electric vehicles (EVs) and energy storage system(ESS) expand rapidly, the development of promising electrodes for lithium-ion batteries (LIBs) with a high energy density is urgently required to replace current-commercialized graphite, which shows a limited theoretical capacity of 372 mAh/g. Therefore, graphene, which have an excellent electrical conductivity and larger specific surface area than graphite as well as flexible properties, has been attracting great attention as a nextgeneration anode material. Although there are various methods of producing graphene, it is difficult to obtain high-quality graphene in an easy and affordable manner. Herein, we report the synthesis of high-quality graphene from graphite using an inexpensive and effective electrochemical exfoliation approach. In a two-electrode system composed of two graphite sheets as anode and cathode, graphene is effectively exfoliated through the intercalation and gasification of ions by alternately applying a constant current of 0.125 A/cm2. The graphene-glass fiber integrated electrode is synthesized by filtration of graphene directly on the glass fiber which is used as a separator for LIBs. This study suggests a facile way to make a graphene-glass fiber integrated electrode, which is expected to contribute to flexible devices with outstanding electrochemical performance and high capacity.