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( Handayani Puji Lestari ),최우혁 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Nowadays,the combination of mesopores and macropores is one of the strategies to produce high ion conducting solid polymer electrolytes for the development in energy storage applications such as lithium ion batteries and supercapacitors. A molecular-level understanding of morphology and ion transport in such a hierarchical porous membrane is importance from fundamental and applied points of view. Here, we successfully synthesize hierarchically porous silica networks containing ionic liquids inside PS-b-P2VP diblock copolymers. This method allows us to generate a disordered, bicontinuous arrangement of discrete silica and IL networks inside PS-b-P2VP, where a 3D continuous network of mesopore silica is incorporated within the macropore walls of diblock copolymer. This novel, hierarchically porous material simultaneously possesses high surface area and a large pore framework, allowing for two orders of magnitude enhancement of ionic conductivity, compared to a simple mixture of IL and PS-b-P2VP.
Electrically Conductive Hybrid Thermoplastic Polyurethane for Energy Storage Devices Applications
( Handayani Puji Lestari ),최우혁 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
High elongate and electrically conductive hybrid thermoplastic polyurethane (TPU) - silica for solid state polymer electrolytes (SPEs) are fabricated via one pot synthesize of sol-gel process. Ionic liquids (ILs) in the TPU matrix system enable the enhancement of ILs ions between hard segments and binding of IL ions to soft or hard segments of the TPU. In general, a DMF are mixed with TPU and ILs to form the homogenous TPU solution. Silica precursor and catalyst was then added to form TPU-SiO2 hybrid. High ion conductivity in room temperature approximately 1x10-3S/cm was achieved even in lowest content ILs and 10%wt SiO2. Mechanical properties and ionic conductivity are investigate with DSC, DMA and EIS respectively.
( Handayani Puji Lestari ),최우혁 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Decades after the first it’s invention, rechargeable lithium ion batteries still aggressively and massively studied and developed. A classic major safety issues due to uncontrolled growth of lithium dendrites becoming a concern in the road of it’s development. Here, we prepare solid polymer electrolyte by cross-linked poly ( ethylene glycol ) diglycidyl ether (PEGDE) with N, N, - Dimethylbenzyamine (BDMA) into epoxy matrix. Combining epoxy matrix with weak-binding Li[TFSI] salt solvating in [BMIM] [TFSI] ionic liquid allowed SPEs generate high ion conductivity. The SPEs with higher ratio of PEGDE in the system reveal a better stretchability compare to SPEs with lower ratio of PEGDE. The enhancement of mechanical properties without neglecting ion conductivity performance is attributed to a perfect cross-linked polymerization and epoxy as framework support.
The Effect of Organic Nanoparticle on Inorganic Solid-State Electrolytes
( Handayani Puji Lestari ),송연화,최우혁 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Composite Polymer electrolytes (CPEs) have served as the focus of intensive research for the next-generation energy storage devices, as they have the advantage of preventing the Li dendrite formation compared with conventional liquid electrolytes. However, inorganic ceramic component generally made CPEs have low ionic conductivity and the high brittleness. Here, a commercially available epoxy is combined with a mixture of Li salt (LiTFSI) with glyme (G4) and silica mesoporous particles (SMP), using the ring-opening polymerization. The SMP as a filler can provide further high mechanical property without significant decrease of ionic conductivity by incorporated into the epoxy-based CPEs. We systematically investigated the effect of SMP content on the ion conduction, dielectric respons, and thermal property using electrochemical impedance spectroscopy, dielectric spectroscopy, and differential scanning calorimetry, respectively.