The vanadium redox flow battery (VRFB) is a type of energy storage system (ESS) that stores surplus energy during times of low demand and delivers it during peak periods. It enables load leveling when the supply of electric power is unstable, which may improve the efficiency of the use of electricity. The major advantages of the VRFB are its non-explosive nature, its scalability with respect to storage capacity and power, its long lifetime, and the recyclability of its components. Therefore, the VRFB has replaced other ESSs, such as lithium-ion batteries, and the interest in VRFBs has increased rapidly. In this dissertation, to improve the performance and reliability of the VRFB system, the core components of the VRFB have been developed using a carbon composite, which has superior electrical and mechanical properties compared to conventional materials.