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Evaluation of hybrid secondary battery performance to the polymer-coated electrode as the cathode
문건오,정호영,임민화,박미정,노현준,( Sadhasivam Thangarasu ) 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Lead-acid batteries has been most widely used in the automotive, until now it seems the higher amount. The improvement of the battery is required by the development of the car. Lead-acid batteries have faces a limitations due to the low power density. Pb/C battery is an electrode with a carbon electrode of the capacitor and PbO<sub>2</sub> electrode of the lead acid battery. Ultra battery has a feature of high energy density as a lead-acid battery and high power density as a capacitor. However, elimination of carbon on the surface will cause a loss of performance of the Pb/C battery. In this study, the polymer coating in order to prevent dropping of the carbon in the negative electrode.
문건오,신동석,임민화,노선균,박경희,정호영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Recently, demand for electricity is nearing the limits of supply in accordance with the increase. As a means to solve this problem, such as the Smart Grid and the ESS has been introduced. Among them, vanadium redox flow batteries can be re-used in the electrolytic solution, and capacity enhancement and maintenance, the maintenance has a highly competitive as to facilitate ESS. But the biggest problem is receiving attention from the redox flow battery capacity is reduced and lifetime degradation due to cross contamination. In this study, in order to prevent cross contamination in the vanadium redox flow battery, sulfonated silica was dispersed in sPPO solution. and it was prepared by casting a solution of sPPO membrane. By changing the amount of silica was to evaluate the performance of the produced silica/sPPO composite membrane. These membranes for dimensional change, conductivity, impedance, the change in performance was observed over a silica content in accordance with the charge/ discharge test.
문건오,신동석,임민화,노선균,박경희,정호영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Ultra battery is in the form a mixture of the carbon electrode of the capacitor electrode and PbO<sub>2</sub> electrode of a lead acid battery electrode. Ultra batteries having the advantages of high power density of ultracapacitors and long charge-discharge time of a lead-acid battery. In the carbon electrode, binder prevents it from falling on the grid to increase the adhesion between the carbon. However, too many binder will interfere the carbon as active area. Therefore, the performance evaluation of the carbon electrode in the content of the binder is important. In this study, we conducted an experiment changing the binder content in the carbon electrode Ultra battery.
polymer coated carbon electrode for Pb/C battery
문건오,이정명,임민화,노현준,박미정,( Sadhasivam Thangarasu ),정호영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Lead-acid batteries has been most widely used in the automotive, until now it seems the higher amount. The improvement of the battery is required by the development of the car. Lead-acid batteries have faces a limitations due to the low power density. Pb/C battery is an electrode with a carbon electrode of the capacitor and PbO2 electrode of the lead acid battery. Ultra battery has a feature of high energy density as a lead-acid battery and high power density as a capacitor. However, elimination of carbon on the surface will cause a loss of performance of the Pb/C battery. In this study, the polymer coating in order to prevent dropping of the carbon in the negative electrode.
Porous polyethylene (PE) as a separator for vanadium redox flow battery
문건오,정호영,임민화,박미정,노현준,( Sadhasivam Thangarasu ) 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
The main components in the vanadium redox flow battery is a membrane. The role of the membrane while preventing the positive and negative electrolytes are mixed, and to give it the ion conductivity that facilitates the movement of proton. However, crossover of vanadium ions, low chemical stability, high prices, has been an obstacle to the development of ion exchange membrane. In this study, using the commercial polyethylene separator (450μm) by trying to introduce the vanadium redox flow battery, we compared the performance as a separator.
Low permeability hydrocarbon-based polymer electrolyte membrane for vanadium redox flow battery
문건오,이정명,임민화,노현준,박미정,( Sadhasivam Thangarasu ),정호영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Polymer electrolyte membrane (PEM) confirms the life span of vanadium redox flow battery (VRFB). Products from Dupont, Nafion membrane, is mainly used for PEM in VRFB. However, permeation of vanadium ion occurs because of Nafion`s high permeability. Therefore, the efficiency of the VRFB decreases and the prices becomes higher, which are problems in the VRFB`s commercialization. In order to solve this problem, poly(phenylene oxide)(PPO) is sulfonated for the preparation of low-priced hydrocarbon polymer electrolyte membrane. The sPPO membrane is characterized by fundamental properties and VRFB cell test.
Performance evaluation of Nafion/silica composite membranes for redox flow battery
문건오,( Sadhasivam Thangarasu ),이정명,신동석,김건주,임민화,박미정,정호영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Efforts to build a renewable energy to environmental problems caused by the depletion of fossil energy and CO2 emissions are concentrated. to solve this problem, such as the Smart Grid and the ESS has been introduced. Because of redox flow batteries can operate at room temperature and burden on maintenance costs and environmental issues are relatively small, It is advantageous for the energy storage system. But the biggest problem is capacity loss of redox flow battery and lifetime degradation due to cross contamination. In this study, in order to prevent cross contamination in the vanadium redox flow battery, sulfonated silica was dispersed in Nafion solution. and it was prepared by casting a solution of Nafion membrane. By changing the amount of silica was to evaluate the performance of the produced silica/Nafion composite membrane. These membranes for dimensional change, conductivity, impedance, the change in performance was observed over a silica content in accordance with the charge/ discharge test.
임민화,문건오,박미정,노현준,이정명,( Sadhasivam Thangarasu ),정호영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
A polyphenylene oxide (PPO)-based anion exchange membrane based on the functionalization of bromomethylated PPO using 1-methylimdazole was fabricated for vanadium redox flow application. The imidazolium-bromomethylated PPO (Im-bPPO) showed lower permeability VO(2+) ions (2.9×10(-14) ㎡/sec), compared to Nafion 212 (2.3×10(-12) ㎡/sec) and FAP-450 (7.9×10(-14) ㎡/sec). Even though the Im-bPPO membrane has higher permeability, the energy efficiency of the VRFB with the Im-bPPO membrane was slightly lower than that of Nafion and FAP-450. The Im-bPPO membrane exhibits good voltage efficiency compared to FAP-450 and Nafion 212 because of its better ion conductivity. The Im-bPPo membrane showed up good performance, but a decline in performance at later cycles was observed.
The reinforced composite membranes based on Nafion/porous polyvinylidene difluoride (PVdF) membranes
임민화,문건오,신동석,정호영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The reinforced composite membranes based on Nafion/porous polyvinylidene difluoride (PVdF) were produced for the application of energy storage systems. In the reinforced composite membranes, Nafion plays the role of proton conductor, and porous PVdF can be used as a supporter that has a strong mechanical stability. For the successful preparation of reinforced membranes, porous PVdF film was modified by potassium hydroxide, which increased the hydrophilicity of porous PVDF film. Enhanced hydrophilicity of PVdF film led to high absorption of Nafion ionomer and high compatibility between Nafion and porous PVdF film. The produced membranes were characterized by dimensional change, water uptake, ion exchange capacity (IEC), and proton conductivity. Furthermore, The reinforced membranes were characterized by FT-IR, HNMR, and SEM.
Examination of sPPO, PVdF, UAN composite membrane adapted in redox flow battery
신동석,정호영,문건오,임민화,노선균,박경희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Commonly hydrocarbon polymer has high ionic conductivity by their hydrophilic property. But this hydrophilic property can cause low mechanical strength at hydro state. However PVdF have hydrophobic property and high mechanical, chemical strength at hydro state. Using these hydrophilic and phobic polymers can make high conductivity and high strength membrane but, opposing character cause separate of both polymer. But use amphiphilic polymer, like UAN can make composite of opposing polymer. The composite membrane consisting of sulfonated poly(propylene oxide) (sPPO) / poly (vinylidenedifluoride) (PVdF) / urethane acrylate non-ionomer (UAN) is adapted in redox flow battery(RFB). In this study, examine character of composite membrane by made of each different composition ratio.