• Journal of Electrochemical Science and Technology
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• 제11권4호
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• pp.430-436
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• 2020

Lithium thionyl chloride (Li/SOCl₂) batteries exhibit the highest energy densities seen in commercially available primary batteries because of their high operating voltages and discharge capacities. They are widely used in various extreme environments; however, they show signs of degradation at high discharge currents. The discharge performance of Li/SOCl₂ is considered to be greatly dependent on the carbon materials used in the cathode. Therefore, suitable carbon materials must be chosen to improve discharge performances. In this work, we investigated the discharge properties of Li/SOCl₂ batteries in which the cathodes contained various ratios of acetylene black (AB) and multi-walled carbon nanotubes (MWCNTs) at high discharge currents. It was confirmed that the MWCNTs were effectively dispersed in the mixed AB/MWCNT cathodes. Moreover, the discharge capacity and operating voltage improved at high discharge currents in these mixed cathodes when compared with pure AB cathodes. It was found that the mesopores present in the cathodes have a strong impact on the discharge capacity, while the macropores present on the cathode surface influence the discharge properties at high discharge rates in Li/SOCl₂ batteries. These results indicate that the ratio of mesopores and macropores in the cathode is key to improving the discharge performance of Li/SOCl₂ batteries, as is the dispersion of the MWCNTs.

• 한국전기전자재료학회논문지
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• 제21권7호
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• pp.679-685
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• 2008

This paper describes the degraded properties of between the charge and discharge current for ${\gamma}$-ray irradiated in electric power cable rubbers using in nuclear power generating station. The charge and discharge current of degradation in EPR(Ethylene Propylene Rubber), which were irradiated with the radiant capacity of 0.033 Mrad/h, have been measured in order to investigate the influence of the atmosphere(in amount of reinforcing agent, moisture absorption and heat treatment) on electrical properties. When ${\gamma}$-ray were irradiated on the EPR with more reinforcing agent from 4 to 40 Phr, charge and discharge currents was increase due to the amount of reinforcing agent. It was verified that the discharging and charging currents irradiated by ${\gamma}$-ray were higher than those that was not irradiated. The amount of the degraded current was more after moisture absorption than before moisture absorption. The charge and discharge current after heat treatment was similar to that of before heat treatment and it was decreased with the time elapsed. As these properties related with ${\gamma}$-ray irradiation dose, it is suggested that these properties can be utilized as a index of irradiation degradation.

• 한국컴퓨터산업학회논문지
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• 제4권12호
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• pp.1013-1020
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• 2003

본 논문에서는 소형변압기에 적용되는 절연재료의 전기적 신뢰성을 평가하기 위하여 시간변화에 따른 방전전하량 특성을 조사하였다. 10[kV]의 교류전압을 인가한 후 $\pm$5[V]의 전압으로 변환시켜 A/D변환기를 통해 컴퓨터로 데이터를 저장하였으며 인가된 파형의 한주기 및 방전전하량 값을 64개로 분할하고 10초 동안 발생한 전하량을 위상별로 누적하였다. 이 값들을 분석한 결과, 전압인가시간이 증가함에 따라 방전발생빈도수 및 총 방전전하량은 감소하였으며 평균 방전전하량의 변화폭이 완만해짐을 알 수 있었다.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2010년도 춘계학술발표대회 초록집
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• pp.26-26
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• 2010

EGW process has been applied to joining of ship block with vertical-up position at high production rate. The workability of EGW, however, has been interrupted by too much slag production. Two electrodes EGW showed more severe workability than that of one electrode EGW. Therefore, to understand the effect of discharge amount of EGW slag on workability and mechanical properties, two different slag discharge amount have been controlled at the same welding conditions. The results are as follows; 1) Workability has been improved by any additional slag discharge. 2) Mechanical properties have been deteriorated with any additional slag discharge. 3) Chemical compositions of weld metal have been changed by any additional slag discharge.

• Journal of Korean Society for Atmospheric Environment
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• 제19권E4호
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• pp.169-175
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• 2003

The effect of gas composition on the discharge characteristics and the ozone production in silent discharge (SD) process was investigated. The major gas components, $N_2$, $O_2$, and $H_2O$ influence the discharge properties according to their relative magnitude of ionization thresholds and electron affinities. The generated amount of ozone increased with the discharge energy by increasing the electron mean energy. The higher oxygen content injected, the higher ozone produced. A small amount of water vapor significantly lowered the discharge onset voltage by the ionization threshold decreasing effect and high electrical conductivity. However, the further increase of water vapor contributes to decrease the electron density by the electron affinity The addition of water greatly reduced the ozone generation through the formation of OH radical and the catalytic ozone destruction process.

• 한국안전학회지
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• 제23권4호
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• pp.42-46
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• 2008

Ionizers are essential in various areas of manufacturing industries to protect electrostatic hazards and to reduce inferior products. For ion sources used in the charge neutralizers, there are corona discharge, soft X-ray, ultraviolet and glow discharge. Glow discharge has lots of attractive properties, such as lower discharge sustaining voltage, no generation of ozone, and so on. In this paper, we did an experimental study to trace the mechanism and stabilization of atmospheric pressure glow discharge using the several size and shape of electrodes. As an experimental result, to sustain conditions of atmospheric pressure glow discharge is that discharge voltage is 360V, discharge current is 12mA, apply frequency is 1kHz between electrodes when positive electrode is molybdenum(Mo) and negative electrode is copper(Cu). We confirmed that the mechanism and stabilization of atmospheric glow discharge is deeply concerned with the shape and material of electrode for discharge. Especially, glow discharge in atmospheric pressure was well generated and sustained according with the physical properties used electrode materials, example melting point, thermal conductivity, and etc.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2000년도 추계학술대회논문집
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• pp.81-84
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• 2000

In this paper, we have the investigated the Influence of Filler Shape on Dielectric & Electric Charge-Discharge Properties of Filled Epoxy Resin. In the low frequency range from 50Hz to a few kHz, the maginitude of tan$\delta$ become larger in the order, NON, RAS, SAS, SCS. The electrical Discharge of RAS measured for 60 min, decreased after 10$^2$∼10$^3$.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 추계학술대회 논문집
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• pp.81-84
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• 2000

In this paper, we have the investigated the Influence of Filler Shape on Dielectric & Electric Charge-Discharge Properties of Filled Epoxy Resin. In the low frequency range from 50Hz to a few kHz, the magnitude of tan$\delta$ become larger in the order, NON, RAS, SAS, SCS. The electrical Discharge of RAS measured for 60 min, decreased after 10$^2$∼10$^3$.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1998년도 춘계학술대회 논문집
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• pp.13-18
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• 1998

After Computer-based PD measurement was referred in the 1970's, the new technology and a number of digital system have been studied. And the selection of PD patterns, extraction of relevant information for PD recognition are discussed because the number of pulse as a function of discharge magnitude and discharge pulse as a function of the power frequency cycl4e offer the information of the aging insulation. This paper investigates the discharge phase($\phi$) and magnitude(q), as well as the number of discharge(n) with regard to discharge signals generated in power cable. Therefore, according to properties analysis on the distribution of $\phi$ , q and n, it is able to apply in the aging analysis of power cable which visual observation is impossible and distribution change of discharge signals offers much information for risk degree on aging progress of insulation materials.

• Composites Research
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• 제23권3호
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• pp.13-18
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• 2010

나노 재료를 다룰 때 큰 문제 중의 하나는 반데르발스(van der Waals) 상호작용으로 응집되어 있는 나노 입자, 특히 CNT를 어떻게 효과적으로 분산시킬 수 있는가이다. 본 연구에서는 나노 입자를 효과적으로 분산시킬 수 있는 방법으로 코로나 방전(corona discharge) 현상과 정전식모(electrostatic flocking) 공정을 이용한 새로운 분산방법인 방전식모(dischare flocking) 장치를 고안하였으며 분산특성을 평가하기 위하여 방전식모 및 RFI 공정으로 복합재료 시편을 제작하여 전기적, 기계적 특성을 비교하였다. 더욱이, CNT와 에폭시의 기체 방전 효과를 평가하기 위하여 플라즈마 처리된 CNT를 사용하여 복합재료를 제작하였으며 전기적, 기계적 특성을 측정하였다. 방전식모 공정으로 제작 된 복합재료 시편의 특성은 RFI로 제작된 시편과 유사하였으며 방전식모 공정중의 기체방전 현상은 플라즈마 처리된 CNT에 영향을 주지 않았다.