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재활용을 고려한 HDPE/EVA필름의 전계분포 및 체적저항특성 해석
이홍규,임기조,김용주,Lee, Hung-Kyu,Lim, Kee-Joe,Kim, Yong-Joo 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.9
Recently, CV, CN-CV and CNCV-W cable are used for HVDC transmission and distribution cable. However, XLPE which is used as insulation layer of power cable has thermosetting properties. It is very difficult to recycling. In this paper, we prepared HDPE/EVA film, which the blending ratio are 80:20, 70:30, 60:40, 50;50 respectively for the purpose of recycling. Main factor such as electric field distribution and its resistivity in insulation system affected on insulation performance and reliability for HVDC applications. Therefore, electric field distribution formed by space charge and characteristics of volume resistivity was currently investigated. We suggest the possibility of utilization for HVDC insulation layer from the results.
DC케이블 적용을 위한 XLPE/나노복합 절연재료의 DC 절연 특성 연구
이한주(Han-Joo Lee),정의환(Eui-Hwan Jung),조성훈(Sung-Hoon Joe),윤재훈(Jae-Hoon Yoon),임기조(Kee-Joe Lim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Recently, CV, CNCV, CNCV-W cable are used to transmit and distribute electric power. And a lot of researchers put more effort to realize high performance. The dielectric breakdown strength characteristic is a standard to design insulators. Examination of that is a main factor to determine long term insulation performance, which is used to diagnose Insulation deterioration. In this paper, we prepared XLPE, XLPE/nano-filler, LDPE/nano-filler for comparing each of the dielectric breakdown strength characteristic.
리튬이차전지 음극재용 나노입자 Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>의 전기화학적 연구
오미현,김한주,김영재,손원근,임기조,박수길,Oh Mi-Hyun,Kim Han-Joo,Kim Young-Jae,Son Won-Keun,Lim Kee-Joe,Park Soo-Gil 한국전기화학회 2006 한국전기화학회지 Vol.9 No.1
리튬이온전지용 음극 활물질로 스피넬 구조의 리튬 티탄산화물$(Li_4Ti_5O_{12})$이 졸겔법과 HEBM법으로 제조되었다. 제조된 $Li_4Ti_5O_{12}$의 입자크기 및 결정구조를 확인하기 위하여 X-선 회절분석(XRD), 주사전자현미경(SEM) 및 평균입자분석(PSA)을 수행한 결과 100nm의 균일한 크기의 입자를 확인하였다. 작업전극으로 $Li_4Ti_5O_{12}$를 사용하고 기준전극과 상대전극으로 lithium 호일을 사용하여 전기화학적인 삼상전극 셀을 구성하여 전기화학적인 특성 평가를 한 결과 $1.0\sim2.5V$의 전압 범위에서 고율 충 방전 성능과 0.2C에서 173mAh/g의 용량 특성을 나타내었다. $Li_4Ti_5O_{12}$은 리튬의 삽입과 탈리가 일어나는 동안 구조적인 안정성을 보여주고 있다. Lithium titanium oxide $(Li_4Ti_5O_{12})$ with spinel-framework structures as anode material for lithium-ion battery was prepared by sol-gel and high energy ball milling (HEBH) method. According to the X-ray diffraction (XRD), Particle Size Analyses(PSA) and scanning electron microscopy (SEM) analysis, uniformly distributed $Li_4Ti_5O_{12}$ particles with grain sizes of 100 nm were observed. Half cells, consisting of $Li_4Ti_5O_{12}$ as working electrode and lithium foil as both counter and reference electrodes showed the high performance of high rate discharge capacity and 173 mAh/g at 0.2C in the range of $1.0\sim2.5 V$. Furthermore, the crystalline structure of $Li_4Ti_5O_{12}$ didn't transform during the lithium intercalation and deintercalation process.