LiNi_0.6Co_0.2Mn_0.2O₂ 양극 활물질의 합성공정 중 나노크기 알루미나 추가에 의한 고온수명 개선

박지민,김다은,김해빈,배중호,이예지,명재인,황은경,임태은,송준호,유지상,류지헌,Park, Ji Min,Kim, Daeun,Kim, Hae Bin,Bae, Joong Ho,Lee, Ye-Ji,Myoung, Jae In,Hwang, Eunkyoung,Yim, Taeeun,Song, Jun Ho,Yu, Ji-Sang,Ryu, Ji Heon 한국전기화학회 2016 한국전기화학회지 Vol.19 No.3

리튬이온 이차전지의 고용량화를 위해 high-Ni계 양극 활물질이 크게 주목받고 있으나, Ni 함량이 높아짐에 따라 고온 안정성이 감소하여 수명저하가 발생하게 된다. 본 연구에서는 $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$ (NCM622)의 합성공정 중에서 전구체인 전이금속 수산화물과 리튬염의 열처리 과정에 알루미나 입자를 첨가함으로써 추가적인 표면처리 공정없이 활물질 특성을 개선시키고자 하였다. 알루미나를 첨가하게 되면 고온 사이클 수명이 개선되었으며, 특히 나노크기의 알루미나를 사용하는 경우에 초기용량의 감소도 적고 수명도 개선됨을 확인하였다. 그리고, 나노 알루미나를 함량별로 추가한 결과로 표면형상이 점차 변화함과 동시에 격자상수의 감소가 발생하는 것이 관찰되어 표면코팅과 구조 내 치환이 동시에 발생하고 있음을 확인하였다. LSTA (linear-sweep thermmametry)를 사용하여 알루미나의 함량이 증가할 수록 부반응이 감소하며 고온 안정성이 증가하는 것을 확인하였다. 또한 전이금속 대비 Al을 2.5 mol% 추가하는 경우에 가장 우수한 고온 사이클 성능이 나타나는 것을 확인하였다. High Ni content layered oxide materials for the positive electrode in lithium-ion batteries have high specific capacity. However, their poor electrochemical and thermal stability at elevated temperature restrict the practical use. A small amount of $Al_2O_3$ was added to the mixture of transition metal hydroxide and lithium hydroxide. The $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$ was simultaneously doped and coated with $Al_2O_3$ during heat-treatment. Electrochemical characteristics of modified $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$ were evaluated by the galvanostatic cycling and the LSTA(linear sweep thermmametry) at the constant voltage conditions. The nano-sized $Al_2O_3$ added materials show better cycle performance at elevated temperature than that of micro-sized $Al_2O_3$. As the added amount of nano-$Al_2O_3$ increased, the thermal stability of electrode also enhanced, but the use of 2.5 mol% Al showed the best high temperature performance.

해외 유명 건축가들-국내 러시 명품의 옷을 입은 건축물

박지민,Park, Ji-Min 한국주택협회 2008 주택과 사람들 Vol.218 No.-

최근에는 굳이 해외에 나가지 않아도 해외 유명 건축가들의 이름을 국내 곳곳에서 쉽게 접할 수 있다. 건축물에 명품의 옷을 입히는 그들은 밋밋한 형식과 틀에서 벗어나 독특한 디자인으로 환영받는 한편, 쓴소리를 듣기도 한다. 국내 곳곳에서 만난 해외 유명 건축가들의 건축물을 정리해본다.

감동을 실현하는 계룡건설-시대를 앞서는 디자인과 따뜻한 감성으로 세계 명품 반열에 오르다

박지민,Park, Ji-Min 한국주택협회 2008 주택과 사람들 Vol.218 No.-

올해로 창립 38주년을 맞이한 계룡건설은 변화와 혁신을 바탕으로 자사 브랜드인 리슈빌의 명성을 이어가고, 해외에서도 다양한 활동을 펼치고 있다. 성공적인 사업 실적과 더불어 도움이 필요한 사회 곳곳에서 봉사를 실천해 진정한 고객 감동을 실현하고 있는 계룡건설에 대해 알아본다.

2008년 하반기 유망 분양 단지-도심 속의 아파트가 뜬다

박지민,Park, Ji-Min 한국주택협회 2008 주택과 사람들 Vol.218 No.-

압축 도시(Compact City)란 도시 용지의 이용 효율성을 높이기 위해 직장과 주거지의 거리를 좁히고, 자연 공간을 최대한 확보할 수 있도록 하는 신개념 도시를 말한다. 압축 도시 형태의 개발이 최근 국내에서 신도시를 비롯해 인기를 끌고 있다. 올 하반기에 분양하는 유망 단지들 역시 이런 트렌드에서 크게 벗어나지 않는다. 어떤 분양 단지가 유망한지 짚어본다.

특집 - 양계산물 소비 활성화 방안 - 안전한 양계산물 생산으로 소비자 신뢰 유지 필요

박지민,Park, Ji-Min 대한양계협회 2012 월간 양계 Vol.44 No.5

집 디자인 어소시에이츠 노정호 대표의 감각적인 집

박지민,Park, Ji-Min 한국주택협회 2008 주택과 사람들 Vol.217 No.-

한강의 '한'과 남산의 '남'이 합쳐져 이름 붙여진 한남동은 예전부터 배산임수의 지형 때문에 고급 주거 지역으로 분류됐다. 한남동은 UN빌리지뿐만 아니라 각국 대사관이 위치하고 있으며, 외국인이나 대기업의 CEO 주택이 즐비하다. 그 끝자락에 위치한 노정호 대표 집을 찾았다.

A Study on Applications of Housing Interior Design Elements according to the Sensibility Type

박지민,박은선,Park, Ji-Min,Park, En-Sun The Korean Housing Association 2014 한국주거학회 논문집 Vol.25 No.3

The purpose of this study was to draw application elements of housing interior design according to user-oriented sensibility types. The sensibility evaluation experiments were conducted to target the general user 118 people using the sensibility evaluation tool for housing interior space. The results of the analysis were as: To produce the 'cozy' space, the colors and materials giving soft and natural feeling should be used. For the 'practical' space, type of ceiling and window that give the visually open feeling, the user-oriented furniture arrangement that allows using the space efficiently. For the 'cheerful' space, the simple and natural effects should be produced by using closed space that stable. For the 'traditional' space, the natural fishing material having rough texture should be used. For the 'unique' space, the space contained the dynamic feeling by the diagonal or vertical line and the graphic expression in the wall. For the 'congenial' emotional space, basic is the symmetric, stable and simple space. On the other hand, for the material, small size, natural texture or typical and soft materials should be used. For the 'sensuous' space, the dynamic and vertical sense of space should be expressed by the type of ceiling. The most important elements for the space of 'gorgeous' sensibility, is the color.

스퍼터링 공정 압력이 InZnO 박막트랜지스터의 광학 및 전기적 특성에 미치는 영향

박지민,김형도,장성철,김현석,Park, Ji-Min,Kim, Hyoung-Do,Jang, Seong Cheol,Kim, Hyun-Suk 한국재료학회 2020 한국재료학회지 Vol.30 No.4

Amorphous In-Ga-Zn-O (a-IGZO) thin film transistors, because of their relatively low mobility, have limits in attempts to fulfill high-end specifications for display backplanes. In-Zn-O (IZO) is a promising semiconductor material for high mobility device applications with excellent transparency to visible light region and low temperature process capability. In this paper, the effects of working pressure on the physical and electrical properties of IZO films and thin film transistors are investigated. The working pressure is modulated from 2 mTorr to 5 mTorr, whereas the other process conditions are fixed. As the working pressure increases, the extracted optical band gap of IZO films gradually decreases. Absorption coefficient spectra indicate that subgap states increase at high working pressure. Furthermore, IZO film fabricated at low working pressure shows smoother surface morphology. As a result, IZO thin film transistors with optimum conditions exhibit excellent switching characteristics with high mobility (≥ 30㎠/Vs) and large on/off ratio.

전통주거안채의 정면비례체계에 관한 연구 - 전남지방 중.상류 주택을 중심으로 -

박지민,천득염,Park, Ji-Min,Cheon, Deuk-Youm 한국건축역사학회 2005 건축역사연구 Vol.14 No.4

The purpose of this study is to prove the correlations among various factors what determined to formation of front elevation proportion system through making an actual survey and investigating. According to the analysis of them, we make conclusions as follows; 1, On the assumption that average distance of 1Kan(間) is 1, the height of foundation is 0.21, the height of floor from foundation is 0.24, the height of normal column from floor is 0.85, the height of eaves from foundation is 1.10. 2. Southeast faced buildings are wider than southwest faced buildings in the distance of 1Kan (間) in the range of $110{sim}220mm$. The height of foundation and floor in the southeast faced buildings are higher than those in southwest faced buildings beside the height of normal column, eaves, high column in the southwest faced buildings are higher than those in southeast faced buildings. 3. As number of front Kan(間) increases, the distance of 1Kan(間) decrease and the height of eaves and high column(高柱) increases. This is cause of making a maximum needed inner space by increasing the distance of 1Kan(間). This is an wisdom for living from ancestors. 4. As number of Dori(道里) increases, the distances of 1Kan are nearly same but the height of eaves and high column(高柱) increases about 300mm, This is a natural result from an increasing of building scale. 5. The distance of 1Kan(間) in later 19C building is most wide but, the unit heights are minimal average values at year 1900 as a reference mark. After this, the height of normal column, eaves, high column are higher about $170{sim}330mm$. 6. The number of Kan in front elevation, Dori(道里), and direction of building have correlations each other in proportion system of traditional housing An-Chae with significant level, p<0.05.

대학생의 감성과 선호하는 주거 실내공간이미지 특성에 관한 연구

박지민,윤정숙,박은선,Park, Ji-Min,Yoon, Chung-Sook,Park, En-Sun 한국주거학회 2011 한국주거학회 논문집 Vol.22 No.6

Due to the belief that housing for university students is uniform materialistic and non-human, a variety of needs and preferences of the residents is becoming more important. In order to more positively identify the user's emotional needs, a design that meets the needs of the resident's living space is absolutely necessary. The purpose of this study is to group the sensibility types of university students, to analyze the preferred interior image and interior design elements, and then to understand the preferred characteristics according to sensibility type. To collect the data, a survey method was used for 224 university students in Seoul and the metropolitan area. The data analysis used SPSS PC 14.0 to find the frequency, t-test, chi-square, factor analysis, and cluster analysis. The results of the analysis are as follows: First, sensibility types were segmented into four groups including 'Unique & Elegant', 'Static & Tidy', 'Warm & Comfortable', and 'Characteristic & Free'. Second, the preferred interior image was the Minimal-Dandy-Natural Image, the preferred floor_material was wood, and the preferred wall_material was marble. Third, there were different interior preferences according to each type of gender & sensibility.