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Ryou, Myung‐,Hyun,Kim, Jangbae,Lee, Inhwa,Kim, Sunjin,Jeong, You Kyeong,Hong, Seonki,Ryu, Ji Hyun,Kim, Taek‐,Soo,Park, Jung‐,Ki,Lee, Haeshin,Choi, Jang Wook WILEY‐VCH Verlag 2013 Advanced Materials Vol.25 No.11
<P><B>Conjugation of mussel‐inspired catechol groups to various polymer backbones</B> results in materials suitable as silicon anode binders. The unique wetness‐resistant adhesion provided by the catechol groups allows the silicon nanoparticle electrodes to maintain their structure throughout the repeated volume expansion and shrinkage during lithiation cycling, thus facilitating substantially improved specific capacities and cycle lives of lithium‐ion batteries.</P>
Ryou, Myung-Hyun,Lee, Dong-Jin,Lee, Je-Nam,Lee, Hong-Kyeong,Seo, Myung-Won,Lee, Hye-Won,Shin, Weon-Ho,Lee, Yong-Min,Choi, Jang-Wook,Park, Jung-Ki The Korean Electrochemical Society 2011 Journal of electrochemical science and technology Vol.2 No.4
A polymer electrolyte was prepared by using polyvinylidenefluoride-co-hexafluoropropylene (PVdF-HFP) or poly(ethylene glycol) dimethacrylate (PEGDMA) as polymer matrices, succinonitrile as an additive, and lithium perchlorate as a lithium salt. Compared to the polymer electrolyte employing PVdF-HFP, the PEGDMA-based polymer electrolyte exhibits substantially superior thermal stability when exposed to high temperatures. Nonetheless, the ionic conductivity of the PEGDMA-based polymer electrolyte was preserved in a wide temperature range between $-20^{\circ}C$ and $80^{\circ}C$.
Ryou, Myung-Hyun,Han, Young-Dal,Lee, Je-Nam,Lee, Dong-Jin,Park, Jung-Ki The Korean Electrochemical Society 2008 한국전기화학회지 Vol.11 No.3
The multilayered membrane for lithium rechargeable batteries based on poly (vinylidene fluoride) (PVdF) is prepared with the coated layer containing nano-sized filler. The prepared membranes were subjected to studies of mechanical strength, morphology, interfacial stability, impedance spectroscopy, ionic conductivity, and cycle performance. The localized inorganic filler in the PVdF composite membrane rendered mechanical strength much reduced because of its low stretching ratio and it results in around half value of the mechanical strength of highly stretched PVdF membrane. In order to achieve high ionic conductivity and interfacial stability without sacrificing high mechanical strength, coating layer with nano-filler was newly introduced to PVdF membrane. The ionic conductivity of the coated membrane was 1.03 mS/cm, and the interface between the coating layer and PVdF membrane was stable when the membrane was immersed into liquid electrolyte. The discharge capacity of the cell based on nano-filler coated PVdF membrane was around 91% of the initial discharge capacity after 250 cycles, which is an improvement in cycle performance compared to the case for the non-coated PVdF membrane.
Mussel‐Inspired Polydopamine‐Treated Polyethylene Separators for High‐Power Li‐Ion Batteries
Ryou, Myung‐,Hyun,Lee, Yong Min,Park, Jung‐,Ki,Choi, Jang Wook WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.27
<P><B>Polydopamine‐treated polyethylene (PE) separators for high‐power lithium ion batteries</B> are developed. A simple dipping process makes the PE surfaces hydrophilic and thus enhances the power capabilities remarkably compared to those of the control cases with bare PE separators. The original mechanical and thermal properties of the PE separators are preserved. </P>
Jong-Myung Kim,신은경,SANG-MI RYOU,JI-HYUN YEOM,이강석 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.4
One of the key challenges in the experimental and therapeutic use of gene delivery agents is the development of methods that can efficiently deliver nucleic acids into living systems. During the past decade, the development of effective and safe gene delivery systems has been intensively investigated. This review summarizes the current state of gene delivery methods based on viral and non-viral agents.