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송우섭,김석 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Recently, metal organic frameworks (MOFs) have been intensively used as excellent carbon precursors to synthesize nanoporous carbon materials. Because the GO/core-shell MOF composites are efficient nonprecious metal catalysts for oxygen reduction reactions, combining core-shell MOFs with graphene oxide (GO) can derived carbon composites exhibit enhanced electrochemical performance due to the increased electrical conductivity and improve cathode structure as host. In this study, seed-mediated deposition method is used to synthesize MOF/graphene oxide (GO)/MOF nano-sandwiches with core-shell structured MOF (ZIF-8@ZIF-67). For comparison, we used same cell except cathode material which is only graphene oxide. Electrochemical properties were conducted by making coin cell and characterized by cyclic voltammetry in 1M LiTFSI electrolyte.
송우섭,김석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Lithium-sulfur battery is great candidate for next-generation energy storage devices. However, dissolution of lithium polysulfides into organic electrolyte lead to poor cycle performance and rate property of lithium-sulfur battery. Metal organic framework is one of the attractive materials in lithium-sulfur batteries as cathode. MOFs can be used to overcome this limit and prevent the dissolution of lithium polysulfides into the electrolyte. Add graphene oxide to increase electro conductivity with MOF structure. In this study, hydrothermal reaction used to synthesis MOFs and change some experiment condition to control their pore size. In order to prove these results, electrochemical properties were characterized by cyclic voltammetry experiment between different pore size MOFs.
송우섭,김석 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Graphene is one of the promising materials in lithium-sulfur batteries as cathode material, but is somewhat limited to confine sulfur owing to its 2D-structure. Molybdenum disulfide (MoS<sub>2</sub>) can be used to overcome this limits. Molybdenum disulfide (MoS<sub>2</sub>) prevented the dissolution of lithium polysulfides into the electrolyte and enhanced the conductivity of the sulfide electrode. They are also adjustable their pore size and shape with simple process. In addition to this promising material, the introduction of conductive graphene oxide could provide Li ion pathways. In this study, a facile process was used to synthesize MoS<sub>2</sub>/graphene nanosheets (GNS) composites by one-step in situ solution-phase method. In order to prove these results, electrochemical properties were characterized by cyclic voltammetry experiment between MoS<sub>2</sub>/GNS cells and only GNS cells.
송우섭,김석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
ZIF-67 and ZIF-8 had been extensively studied in lithium sulfur battery because it can prevent the dissolution of lithium polysulfides into the electrolyte. Two of them has the same ligands, so it can be easily synthesized as a dimetal organic framework structure. In this study, hydrothermal reaction used to synthesize MOF (ZIF-8@ZIF-67) and to test thermal stability in carbonization process, because ZIF-8 has low stability over 500°C. In order to prove these results, electrochemical properties were characterized by cyclic voltammetry experiment between carbonized MOFs and non-carbonized MOFs.
송우섭,김석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Graphene is one of the promising materials in lithium-sulfur batteries as cathode material, but is somewhat limited to imprison sulfur owing to its structure. The pitch distilled from petroleum is useful carbon material in lithium ion batteries for modifying graphite anode and attributes to improve capacity. In this experiment, we prepared cathode material by coating graphene oxide with pitch and conducted thermal treatment. This coating process could reduce capacity loss for dissolution of polysulfide into electrolyte. For comparison, we used only graphene oxide as cathode and others were same. Electrochemical properties were characterized by cyclic voltammetry in 1M LiTFSI electrolyte.
송우섭,김석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Graphene is good for sulfur anchor but have limited durability owing to its 2D-structure. Molybdenum disulfide (MoS2) can be used to overcome this limit. Molybdenum disulfide (MoS2) prevented the dissolution of lithium polysulfides into the electrolyte and enhanced the conductivity of the sulfide electrode. They are also adjustable their pore size and shape with simple process. In addition to this promising material, the introduction of conductive graphene oxide could provide Li ion pathways. In this study, a facile process was used to synthesize MoS2/graphene nanosheets (GNS) composites by one-step in situ solution-phase method. In order to prove these results, electrochemical properties were characterized by cyclic voltammetry experiment between MoS2/GNS cells and only GNS cells.