| Summary: | 碩士 === 國立中興大學 === 精密工程學系所 === 100 === This study discussed the VRB (Vanadium Redox Battery) electrode efficiency by experiments including graphite felt electrode process, graphite felt electrode activation, single cell efficiency and internal resistance measurement. This study obtained soft graphite felt through high temperature carbonization and graphitization. It then employed the vapor grown carbon fibers method to prepare graphite felt with carbon nanotubes. The impregnation phenolic resin method was used to prepare rigid graphite felt. The large surface area and low resistance electrode obtained by the process can reduce the through-plane resistance from 0.168mΩ/cm2 to 0.054mΩ/cm2. The graphite felt electrode activation can be realized by heat treatment, acid treatment and alkali treatment to increase electrode surface functional groups and electrode surface area. The experimental results showed that, when the electrode is heated up to 350℃ and is soaked in acid solution with high concentration for two hours, good electrochemical activation can be realized. The experimental results on the single cell efficiency measurement showed that the charge and discharge efficiency of the battery after the activation heat processing at 350℃ of the rigid graphite felt can be up to 80%. The proposed graphite felt electrode can be applied in VRB. This study demonstrated the feasible and functional empirical results of vanadium battery applications.
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