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리튬이온이차전지용 고효율 음극(SiO-Graphite)
신혜민,도칠훈,김동훈,김효석,하경화,진봉수,김현수,문성인,김기원,오대희,Shin, Hye-Min,Doh, Chil-Hoon,Kim, Dong-Hun,Kim, Hyo-Seok,Ha, Kyung-Hwa,Jin, Bong-Soo,Kim, Hyun-Soo,Moon, Seong-In,Kim, Ki-Won,Oh, Dae-Hui 한국전기화학회 2008 한국전기화학회지 Vol.11 No.1
현재 상용화 되어있는 흑연의 저용량 문제를 해결하기 위해 실리콘이나 주석계 등 고용량 비탄소계 음극전극재료들이 연구되고 있다. 이 중 산화실리콘(SiO)은 초기 충전(환원)과정에서 Li이 삽입되면서 $Li_2O$생성으로 비가역 비용량이 발생하여 초기 싸이클에서 쿨롱효율이 낮고, 싸이클링에 따라 리튬 탈 삽입 과정의 비용량이 증가하는 특징으로 실제의 전지를 설계할 시 문제점을 가진다. 본 연구에서는 고용랑 특성을 나타내는 비탄소계 실리콘을 포함하는 리튬이차전지용 음극활물질과 흑연의 복합체를 제조하여 흑연으로 실리콘의 부피팽창을 완화시키고, 사이클 특성을 향상시키는 실리콘(SiO-Graphite) 재료를 개발하고, 산화실리콘과 흑연 복합체의 높은 비가역 용량의 해소와 싸이클에 따른 리튬 탈삽입 과정의 용량증가를 해소하기 위한 전처리를 통하여 초기 효율을 향상한 전극의 제조에 대하여 연구하였다. A new anode composition material comprising of SiO and Graphite has been prepared by adopting High energy ball milling (HEBM) technique. The anode material shows high initial charge and discharge capacity values of 1139 and 568 mAh/g, respectively. The electrode sustains reversible discharge capacity value of 719 mAh/g at 30th cycle with a high coulombic efficiency${\sim}99%$. Since the materials formed during initial charge process the nano silicon/$Li_4SiO_3$ and $Li_2O$ remains as interdependent, it may be expected that the composite exhibiting higher amount of irreversibility$(Li_2O)$ will deliver higher reversible capacity. In this study, constant current-constant voltage (CC-CV) charge method was employed in place of usual constant current (CC) method in order to convert efficiently all the SiO particles which resulted high initial discharge capacity at the first cycle. We improved considerably the initial discharge specific capacity of SiO/G composite by pretreatment(CC-CV).
신혜민(Shin, Hye-Min),장예진(Jang, Ye-jin),김소정(Kim, So-Jeong),이수웅(Lee, Su-Woong),최원영(Chio, Won-Young),신경재(Shin, Kyung-Jae) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.2
Friction damper is simpler and more stable in design than ordinary steel damper. It is easily used for seismic reinforcement which reduces the earthquake response of buildings by simply adjusting the tension introduced on the friction surface. However, when repeated friction occurs due to the earthquake load, the thickness of the friction material is reduced, the tension of the bolt is decreased and the damper performance is reduced. Therefore, in order to prevent this, it is necessary to check the performance of the bolt tension change periodically. In this study, the cyclic force test was carried out by classifying the friction surface into mill scale, sandpaper, and rusty condition, and the difference between the maximum frictional strength and the hysteretic behavior of the damper according to the surface condition was compared. In addition, a cylindrical load cell was fabricated to measure the tension change of the bolt during damper behavior.
국내외지진파를 이용한 필로티형 주거용 건축물의 전산해석
신혜민(Shin, Hye-Min),이수웅(Lee, Su-Woong),신경재(Shin, Kyung-Jae) 대한건축학회 2018 대한건축학회 학술발표대회 논문집 Vol.38 No.2
In this study, the nonlinear analysis of piloti-type residential building was performed using OpenSees to investigate the seismcic capacity of those buildngs. Most of the piloti-type multi-family houses, which occupy a large proportion of residential buildings in Korea, are designed to have non-seismic detail, which is likely to cause great damage in an earthquake. In the case of piloti-type buildings, the arrangement of the walls is irregular and the first floor is an atypical structure composed of a minimum number of columns and shear walls, which makes it difficult to perform nonlinear analysis. Therefore, the plasticity and shear deformation of the 1 story columns were analyzed through 2D modeling of the piloti-type building.
학교 건축물의 모형실험을 통한 국내지진에 대한 내진보강에 관한 연구
신혜민(Shin, Hye-Min),전아현(Jun, A-Hyun),최혜지(Chio, Hye-ji),팽지영(Paeng, Ji-Yeong),유민지(Yu, Min-ji),이재경(Lee, Jae-gyoung),이현지(Lee, Hyeon-Ji),신경재(Shin, Kyung-Jae) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
The purpose of this study is to develop various seismic reinforcement through shaking table test and nonlinear analysis of the school building. After the Gyeongju 9.12 earthquake, the government has set a policy to extend the scope of the mandatory seismic design on new buildings and public buildings, and to expand the seismic reinforcement of public buildings with low rate of seismic design. 86% of elementary, middle, and high school buildings surveyed in Korea were found to be vulnerable to earthquakes. Therefore, it is necessary to strengthen the seismic reinforcement of the school buildings that should be used as a disaster evacuation facility.