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RISS 인기검색어
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- 저자 : 이승병(Lee Sung-Byung) (검색결과 2 건)
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전기방사법을 이용한 LiFePO<sub>4</sub> 양극 활물질의 합성 및 전기화학적 특성
이승병,조승현,박선일,이완진,이윤성,Lee, Seung-Byung,Cho, Seung-Hyun,Park, Sun-Il,Lee, Wan-Jin,Lee, Yun-Sung 한국전기화학회 2008 한국전기화학회지 Vol.11 No.4
본 연구에서는 $LiFePO_4$의 입자크기를 조절함으로써 우수한 전극특성을 나타낼 수 있도록 최적의 입자크기($50{\sim}100\;nm$)를 가지는 $LiFePO_4$ 양극 활물질을 전기방사법을 이용하여 합성하였다. XRD 분석결과 FeP, $Fe_2P$ 등의 불순물이 존재하지 않는 Pnma의 공간군을 가지는 잘 발달된 사방정 구조의 $LiFePO_4$가 합성됨을 확인하였으며, SEM 분석을 통하여 시료의 입자형태 및 크기를 관찰하였다. $0.1\;mA/cm^2$의 전류밀도와 $2.8{\sim}4.0\;V$의 전위영역에서 충 방전 테스트 수행시 135 mAh/g의 초기 방전용량을 나타내었으며, 50 싸이클 후에도 99.9% 이상의 용량 보존율을 보이는 우수한 싸이클 특성을 나타내었다. $LiFePO_4$ material was synthesized by electrospinning method to obtain optimal particle size($50{\sim}100\;nm$) without carbon coating or ball milling. This material showed an orthorthombic structure with Pnma space group without any impurities, such as FeP or $Fe_2P$, in the XRD pattern. The particle morphology and particle shape were observed by SEM analysis. Li/$LiFePO_4$ cell showed a high initial discharge capacity of 135 mAh/g, at current density of $0.1\;mA/cm^2$ with a cut-off voltage of 2.8 to 4.0V. This cell exhibited a perfect cycle performance over 99.9% cycle retention rate up to 50 cycles.
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탄력밴드를 이용한 4주간의 견관절 나선 직선 운동이 견관절의 기능에 미치는 영향
이승병(Lee Sung-Byung),김선엽(Kim Suhn-Yeop),김병완(Kim Byeong-Wan),김창환(Kim Chang-Whan) 한국체육과학회 2009 한국체육과학회지 Vol.18 No.2
Executed to know what shoulder joint spiral exercise and straight exercise for 4 weeks using Theraband have an effect on function of shoulder joint. It is a purpose of this study. This Study targets are 19 males who go to the university and classified as 10 persons of spiral exercise group, 9 persons of straight exercise group. As a results, We got the following conclusion. The changes in throwing with standing, throwing with sitting, Davies closed kinetic chain test, push-ups test and Isokinetic exercise during and after the exercise session, were significantly incresed both in spiral exercise and in straight exercise(P<.01). There was statistically more significant difference in spiral exercise group than in straight exercise group concerning the rate of change in distance of throwing with standing and throwing with sitting during and after the exercise session(P<.01). Various exercise and movements named diagonal line or helix or oblique used in every day life, is getting used already to cure a sickness or play sports. But, now, basic researches about these movements is insignificant. because, there are several difficult problems. Therefore, I wish that from now on, an examination comes into effect through this study, in more systematic and various field.
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