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Cho, Sung-Ju,Jung, Gwan Yeong,Kim, Su Hwan,Jang, Minchul,Yang, Doo-Kyung,Kwak, Sang Kyu,Lee, Sang-Young The Royal Society of Chemistry 2019 ENERGY AND ENVIRONMENTAL SCIENCE Vol.12 No.2
<P>Traditional single-phase electrolytes, which are widely used in current state-of-the-art rechargeable batteries, have difficulties simultaneously fulfilling different chemical/electrochemical requirements of anodes and cathodes. Here, we demonstrate a new class of monolithic heterojunction quasi-solid-state electrolytes (MH-QEs) based on thermodynamically immiscible dual phases. As a proof-of-concept of the MH-QEs, their application to lithium-sulfur batteries is explored. Driven by combined effects of structural uniqueness and thermodynamic immiscibility, the electrode-customized MH-QEs provide exceptional electrochemical performance that lies far beyond those accessible with conventional battery electrolytes.</P>
Non-Grignard and Lewis Acid-Free Sulfone Electrolytes for Rechargeable Magnesium Batteries
Kang, Sung-Jin,Lim, Sung-Chul,Kim, Hyeonji,Heo, Jongwook W.,Hwang, Sunwook,Jang, Minchul,Yang, Dookyong,Hong, Seung-Tae,Lee, Hochun American Chemical Society 2017 Chemistry of materials Vol.29 No.7
<P>A major challenge for developing rechargeable Mg-ion batteries (MIB) is the lack of suitable electrolytes. We report herein dialkyl sulfones as non-Grignard and Lewis acid free MIB electrolytes. In particular, a dipropyl sulfone (DPSO)/tetrahydrofuran (THF) (1/1, v/v) solution with MgCl2 salt exhibits high ionic conductivity (1.1 mS cm(-1) at 30 degrees C), Mg cycling efficiency (>90%), and anodic stability (ca. 3.0 V vs Mg). As evidenced by single crystal X-ray diffraction analysis, a novel [Mg(DPSO)(6)](2+) cation complex balanced by two [MgCl3(THF)](-) anions is identified in the DPSO/THF solution. The DPSO/THF electrolyte also enables excellent cycle performance (>300 cycles) of a Chevrel phase Mo6S8 cathode and displays a decent compatibility with an organic cathode (3,4,9,10-perylenetetracarboxylic dianhydride, PTCDA). Along with the superior electrochemical properties of the DPSO/THF electrolyte, its innate chemical stability and eco-friendly nature make it a promising MIB electrolyte.</P>
MinChul Ju,Kyu-Sung Hwang IEEE 2015 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.14 No.6
<P>In this paper, we investigate two different relay selection schemes, opportunistic relaying (OR) and selection cooperation (SC), for decode-and-forward (DF)-based relay networks consisting of a source, multiple relays, and a destination in the presence of multiple co-channel interferers, where each terminal has a single antenna and operates in a half-duplex mode. For the network, we first extend the conventional OR and SC to relay networks with the direct-path and multiple co-channel interferers, and obtain the exact and closed-form outage probability of the OR. Then, we show that the SC is equivalent to the OR in terms of outage performance for relay networks with the direct-path and multiple co-channel interferers. Finally, we show that the SC and OR are outage-optimal under the aggregate power consumption constraint at the relays for relay networks with the direct-path and multiple co-channel interferers.</P>
Maximum Transmission Rate of PSR/TSR Protocols in Wireless Energy Harvesting DF-Based Relay Networks
MinChul Ju,Kyu-Min Kang,Kyu-Sung Hwang,Cheol Jeong IEEE 2015 IEEE journal on selected areas in communications Vol.33 No.12
<P>In this paper, we consider the power splitting relaying (PSR) and time switching relaying (TSR) protocols for decode-and-forward (DF)-based relay networks consisting of a source, a relay, and a destination. For the networks, the relay is assumed to have a rechargeable battery with a certain amount of remaining energy for energy harvesting through the received signal transmitted from the source. Specifically, for the PSR protocol with and without the direct-path, we present the outage probability expression with a given power splitting coefficient, and we obtain the optimum power splitting coefficient to maximize the transmission rate and derive its transmission rate and outage probability, where the optimum coefficient depends on channel conditions and remaining energy. For the TSR protocol with and without the direct-path, we present the outage probability expression with a given time switching coefficient, and we obtain the optimum time switching coefficient to maximize the transmission rate and derive its transmission rate, where the optimum coefficient also depends on channel conditions and remaining energy.</P>
Minchul Lee(이민철),Yeongseon Kim(김영선),Hyunjun Ryu(류현준),Sung-Hyun Baeck(백성현),Sang Eun Shim(심상은) 한국고분자학회 2017 폴리머 Vol.41 No.4
실란 커플링제 도입에 따라 silica가 충전된 폴리프로필렌의 기계적, 열적 물성에 미치는 영향을 살펴보았다. Epoxy, amino와 methacryloxy 작용기를 가지고 있는 실란 커플링제를 사용하였다. 종류, 농도와 실란 커플링제의 처리방법에 따라 silica/PP 복합체의 인장강도, 굴곡강도, 충격강도 및 열적안정성을 분석하였다. 용융혼합 및 압축성형에 의해 제조된 복합재료 샘플의 기계적 특성을 조사하기 위해 만능재료시험기와 충격시험기를 사용하였고, 열적특성을 조사하기 위해, TGA와 DSC를 사용하였다. 건식방법으로 amino 작용기를 가지고 있는 실란 커플링제를 5 wt% 혼합한 silica/PP 복합체가 기계적 물성과 열적 물성이 가장 우수한 것으로 확인되었다. The effect of silane coupling agent on the mechanical and thermal properties of silica/polypropylene composite was studied. Epoxy, amino, and methacryloxy silanes were introduced as coupling agents. Silica/PP composites were investigated in terms of flexural, tensile, impact strength, and thermal stability in accordance with type, concentration, and processing methods of silane coupling agent. Mechanical properties of the composites prepared by melt-mixing and compression molding were tested by UTM and impact tester, and thermal properties were analyzed by TGA and DSC. As a result, it was confirmed that the silica/PP composite mixed with 5 wt% amino-functionalized silane prepared by dry method showed the highest mechanical and thermal properties.