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전력품질 안정화용 비대칭 하이브리드 슈퍼커패시터 셀 및 모듈 특성
이병관(Byung-Gwan Lee),맹주철(Ju-Cheul Maeng),이종규(Joung-Kyu Lee),윤중락(Jung-Rag Yoon) 대한전기학회 2016 전기학회논문지 Vol.65 No.4
In addition to the energy storage facilities based on high power technologies, Electric double layer capacitors(EDLC) are today"s candidate for power quality stabilization. However, its low energy density is often inhibiting factor for application of electric power industry. Hybrid supercapacitor is an promising energy storage device that positioned between conventional EDLC and Li-ion battery. This paper describes the preparation and characteristics of a hybrid supercapacitor and module for power quality stabilization. A cylindrical 3200F hybrid supercapacitor (60 × 74.5 mm) was assembled by using the Li4Ti5O12 electrode as an anode and activated carbon as a cathode. It shows 2.5 times higher energy density than conventional EDLC with the same volume. In order to determine the characteristics of the hybrid supercapacitor Module for uninterruptible power supply (UPS), hybrid supercapacitor cells were connected in series with active balancing circuit. At even the high current density of 14A(10C), Module prepared by 18 cells showed the capacitance of 170F at 30~50V, suggesting the applicability for UPS.
논문 : 에틸렌 글리콜 용액에서 물 함량에 따른 티타늄 양극산화 나노튜브의 성장거동
이병관 ( Byung Gwan Lee ),이성은 ( Seong Eun Lee ),최진욱 ( Jin Wook Choi ),정용수 ( Yong Soo Jeong ),오한준 ( Han Jun Oh ),이오연 ( Oh Yeon Lee ),지충수 ( Choong Soo Chi ) 대한금속재료학회 ( 구 대한금속학회 ) 2008 대한금속·재료학회지 Vol.46 No.11
TiO2 nanotubes fabricated in aqueous HF-based electrolytes have been generally grown only to about 500nm in length because of the strong dissolubility of HF acid. In this paper, ethylene glycol solution has been applied for increasing the length of the anodic TiO2 nanotubes, and the growth behaviors of the nanotubes according to water contents has been investigated. Anodization of Ti in ethylene glycol+1 wt% NH4F (EG solution) with water additions up to 10 wt% were carried out at the constant voltage of 20 V. The results show that a thin titanium oxide layer is formed in the initial stage and the nanotube structure grows underneath the initial layer. And the length of TiO2 nanotubes decreases with the increasing water content in the solution. It can be ascribed to the locally acidified circumstance around the barrier layer inside the nanopore due to H+ ion originated from water. The XPS for the nanotubes suggests that the spectra of Ti2p and O1s are the major chemical bonding states of the TiO2, and those for F1s, N1s and C1s come from the compound of (NH4)2TiF6.
하이브리드 슈퍼커패시터의 음극 및 양극 설계에 따른 전기화학적 거동
신승일,이병관,하민우,안건형,Shin, Seung-Il,Lee, Byung-Gwan,Ha, Min-Woo,An, Geon-Hyoung 한국재료학회 2019 한국재료학회지 Vol.29 No.12
The performance of Li-ion hybrid supercapacitors (asymmetric-type) depends on many factors such as the capacity ratio, material properties, cell designs and operating conditions. Among these, in consideration of balanced electrochemical reactions, the capacity ratio of the negative (anode) to positive (cathode) electrode is one of the most important factors to design the Li-ion hybrid supercapacitors for high energy storing performance. We assemble Li-ion hybrid supercapacitors using activated carbon (AC) as anode material, lithium manganese oxide as cathode material, and organic electrolyte (1 mol L<sup>-1</sup> LiPF<sub>6</sub> in acetonitrile). At this point, the thickness of the anode electrode is controlled at 160, 200, and 240 ㎛. Also, thickness of cathode electrode is fixed at 60 ㎛. Then, the effect of negative and positive electrode ratio on the electrochemical performance of AC/LiMn<sub>2</sub>O<sub>4</sub> Li-ion hybrid supercapacitors is investigated, especially in the terms of capacity and cyclability at high current density. In this study, we demonstrate the relationship of capacity ratio between anode and cathode electrode, and the excellent electrochemical performance of AC/LiMn<sub>2</sub>O<sub>4</sub> Li-ion hybrid supercapacitors. The remarkable capability of these materials proves that manipulation of the capacity ratio is a promising technology for high-performance Li-ion hybrid supercapacitors.
한국 증권시장에서의 보통주와 우선주간의 가격괴리율에 대한 실증분석
곽병관,이병관 충북대학교 산업경영연구소 1999 産業과 經營 Vol.12 No.1
현재 거래되고 있는 우선주의 대부분은 지난 1980년대 후반의 증시 활황기에 발행된 것으로 보통주에 대해 1% 추가배당 조건의 형태를 띠고 있다. 이러한 우선주와 보통주의 가격 차이를 나타내는 주가괴리율은 발행 초기에는 심각하지 않다가 1994년 중반 이후에 확대되기 시작하여 현재 거의 50∼60%에 이르고 있는 실정이다. 본 연구에서는 보통주와 우선주간의 주가괴리가 발생하는 원인에 대해 알아보고자 우리 나라 우선주의 특성 및 이용현황을 살펴보고, 우선주와 보통주의 주가괴리에 대한 영향요인을 실증적으로 검증하고자 하였다. 실증분석결과 우선주발행비중, 기업규모가 통계적으로 매우 유의한 설명변수로 나타났는데, 이는 주가괴리율이 의결권의 가치를 반영하고 있다는 가설을 지지하고 있음을 의미한다. 또한, 주가지수와 주가괴리율과는 주가괴리율 심화기간 동안 유의한 부(-)의 상관관계가 있는 것으로 나타나 주가하락시 대주주들의 우선주 집중투매가 주가괴리 심화의 한 원인이었음을 뒷받침해주고 있다.