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Chen, Guanliang,Lin, Xiujuan,Li, Jianan,Fisher, John G.,Zhang, Yan,Huang, Shifeng,Cheng, Xin Elsevier 2018 CERAMICS INTERNATIONAL Vol.44 No.13
<P><B>Abstract</B></P> <P>Flexible dielectric composite films are highly desirable materials with potential application in capacitors due to their high energy density and discharged efficiency. However, agglomeration induced by the large surface energy of nanoparticles and their large dielectric losses are unfavorable to the improvement of energy density. Submicron lead zirconate titanate (PZT) particles have shown great potential as filler in achieving a high energy storage capacity because of their excellent dielectric properties and good dispersion. In this work, calcined PZT particles were used to prepare PZT/polyvinylidene fluoride (PVDF) composite films. The results showed that composite films of high quality could be obtained even with high contents of submicron PZT particles. The introduction of PZT particles significantly improved the dielectric performance of composite films compared with that of the pristine PVDF film. The discharged energy density of composite films with 10 vol% PZT particles achieved 6.41 J/cm<SUP>3</SUP> at 250 kV/mm. A high efficiency of 87.25% was obtained at 50 kV/mm. These findings confirm the feasibility of PZT particles as inorganic filler in composite films for energy storage applications.</P>
Lee, Hyo June,Park, Sangki,Kim, Hansung The Electrochemical Society 2018 Journal of the Electrochemical Society Vol.165 No.5
<P>To increase the energy density of a vanadium redox flow battery (VRFB), the Mn(II)/Mn(III) system was used as a positive reaction and its effect on the performance and cycle life were investigated. The discharge voltage of the V/Mn system increased due to the higher redox potential of Mn(II)/Mn(III), which led to a 47% increase in initial energy density from 21 Wh L-1 to 31 Wh L-1. However, Mn(III) ions in the positive electrolyte are converted to MnO2 upon charging and remain in the precipitate without being reduced upon discharge, thus decreasing the energy density of the V/Mn system up to the 10th cycle. As cycles progressed further, the number of vanadium ions permeating to the positive electrolyte increased, and the particle size of MnO2 decreased. As a result, MnO2 could participate in the reduction reaction without precipitating, resulting in increased energy density. These results show the possibility of using Mn ions for the positive reaction by appropriately controlling the particle size of MnO2. (c) 2018 The Electrochemical Society.</P>
Oleksii Serhiiovych Kulyk,Oleg Volodymyrovych Shutenko 한국전기전자재료학회 2019 Transactions on Electrical and Electronic Material Vol.20 No.5
The paper presents the results of the analysis of the gas content in 444 units of oil-fi lled equipment, which revealed spark and creeping discharges, as well as discharges with high energy density. The values of gas ratios and the percentage of gases in oil samples are calculated. Nomograms and graphical areas of defects are constructed. The description of the most characteristic damages in the equipment is given. Diagnostics of the equipment using the Duval triangle is carried out. The results obtained make it possible to increase the reliability of defect type recognition based on the results of the analysis of gases dissolved in oil.
Adedeji A. Adelodun 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-
The viability of non-thermal plasma (NTP) systems for the treatment of various VOC types was assessed. Also evaluated were the individual and collective influences of selected process parameters on the NTP-VOC systems’ performances. To this end, the process and performance evaluations of the reported NTP-VOC pairs, based on the established (VOC molecular weight, input voltage, specific input energy (SIE),flow rate, and degradation efficiency) and calculated (processing rate, system efficiency, cumulativeenergy density (e), and space-time yield) parameters were reported. With a catalyst, an increase in thegasflow rate enhanced the processing rate of the system by approximately 50%. At the same time, theinfluence of a on the byproducts remains unpredictable. Also, the correlation values of the processing rateagainst the system efficiency were significantly high and positive (0.9423). About 87% of the calculatedattributes correlated with the double-barrier discharge reactor. Theflow rate and input voltage evincedas the most influential parameters for all NTP-VOC systems. Moreover, the estimated e (J/L) is morereliable than the SIE for performance comparison. Conclusively, the processing rate, space-time yield, andenergy density are the derived attributes that should be considered before any NTP-VOC process design.
S. Maitra,R. Mitra,T.K. Nath 한국물리학회 2020 Current Applied Physics Vol.20 No.5
In this work, we have successfully synthesized MgNiO2 using a sol-gel wet chemical synthesis technique named MNO - 3. Electrochemical measurements in the presence of aqueous 1 M Li2SO4 electrolyte indicate that MNO - 3 samples exhibit a capacitance value of about 30 F/g and an energy density of about 20 Wh/kg. Subsequently, in the experiment involving aqueous 0.5 M Na2SO4 electrolyte system, it has been found that the capacitance for MNO - 3 sample is about 34 F/g and the energy density is about 23 Wh/kg for MNO - 3 sample. Finally, in the presence of aqueous-based 1 M Mg(ClO4)2 electrolyte, MNO - 3 sample is found to exhibit a capacitance of about 26 F/g and an energy density of about 17 Wh/kg, respectively. In all three electrolyte systems, the MNO -3 sample exhibit a long cycle capacitance retention of greater than 85% for 1000 charge-discharge cycles.
연소합성법에 의한 결함구조 Li4Mn5O12제조와 하이브리드 커패시터 적용
김훈욱,선양국,이범석,진창수,신경희 한국전기화학회 2010 한국전기화학회지 Vol.13 No.2
Li4Mn5O12 was synthesized by combustion method using LiNO3, Li(CH3COO)·2H2O and Mn(CH3COO)2·4H2O. Li4Mn5O12 was obtained over 400˚C, however, the sample calcined at 400oC for any time was mixed phases of Li4Mn5O12 and Mn2O3. Li4Mn5O12 calcined at 400oC for 5 h had larger first discharge capacity (41.5mAh/g) at 1C-rate for 3.7~4.4V than other calcined samples. Moreover, applying to hybrid capacitor, it had good discharge capacity (24.74 mAh/g or 10.46 mAh/cc) at 100 mA/g for 1~2.5 V and higher energy density (39Wh/kg or 16.49Wh/cc)at same condition.
Chemically deposited nano grain composed MoS<sub>2</sub> thin films for supercapacitor application
Pujari, R.B.,Lokhande, A.C.,Shelke, A.R.,Kim, J.H.,Lokhande, C.D. Academic Press 2017 Journal of Colloid and Interface Science Vol. No.
<P><B>Abstract</B></P> <P>Low temperature soft chemical synthesis approach is employed towards MoS<SUB>2</SUB> thin film preparation on cost effective stainless steel substrate. 3-D semispherical nano-grain composed surface texture of MoS<SUB>2</SUB> film is observed through FE-SEM technique. Electrochemical supercapacitor performance of MoS<SUB>2</SUB> film is tested from cyclic voltammetry (CV) and galvanostatic charge discharge (GCD) techniques in 1M aqueous Na<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. Specific capacitance (C<SUB>s</SUB>) of 180Fg<SUP>−1</SUP> with CV cycling stability of 82% for 1000 cycles is achieved. Equivalent series resistance (R<SUB>s</SUB>) of 1.78Ωcm<SUP>−2</SUP> observed through Nyquist plot shows usefulness of MoS<SUB>2</SUB> thin film for charge conduction in supercapacitor application.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
연소합성법에 의한 결함구조 Li<sub>4</sub>Mn<sub>5</sub>O<sub>12</sub>제조와 하이브리드 커패시터 적용
김훈욱,선양국,이범석,진창수,신경희,Kim, Hun-Uk,Sun, Yang-Kook,Lee, Bum-Suk,Jin, Chang-Soo,Shin, Kyoung-Hee 한국전기화학회 2010 한국전기화학회지 Vol.13 No.2
$LiNO_3$, $Li(CH_3COO){\cdot}2H_2O$ 그리고 $Mn(CH_3COO)_2{\cdot}4H_2O$를 출발물질로 하여 $Li_4Mn_5O_{12}$를 합성 하였으며 합성방법은 연소합성법을 사용하였다. $Li_4Mn_5O_{12}$는 $400^{\circ}C$ 이상의 열처리 온도에서 얻을 수 있었으나 $400^{\circ}C$로 열처리 하였을 때 $Mn_2O_3$가 같이 존재하는 것을 관찰할 수 있었다. $400^{\circ}C$에서 5시간동안 열처리한 $Li_4Mn_5O_{12}$를 3.7~4.4 V의 전압범위에서 1C-rate로 충방전 하였을 때 가장 좋은 첫 번째 방전용량(41.5 mAh/g)을 나타내었다. 이것을 하이브리드 커패시터에 적용하였을 때 100 mA/g의 전류밀도에서 24.74 mAh/g (10.46 mAh/cc)의 방전용량을 나타내었으며 이때의 에너지 밀도는 39 Wh/kg (16.49Wh/cc)으로 우수하였다. $Li_4Mn_5O_{12}$ was synthesized by combustion method using $LiNO_3$, $Li(CH_3COO){\cdot}2H_2O$ and $Mn(CH_3COO)_2{\cdot}4H_2O$. $Li_4Mn_5O_{12}$ was obtained over $400^{\circ}C$, however, the sample calcined at $400^{\circ}C$ for any time was mixed phases of $Li_4Mn_5O_{12}$ and $Mn_2O_3$. $Li_4Mn_5O_{12}$ calcined at $400^{\circ}C$ for 5 h had larger first discharge capacity (41.5mAh/g) at 1C-rate for 3.7~4.4V than other calcined samples. Moreover, applying to hybrid capacitor, it had good discharge capacity (24.74 mAh/g or 10.46 mAh/cc) at 100 mA/g for 1~2.5 V and higher energy density (39Wh/kg or 16.49Wh/cc) at same condition.