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TEGDME 액체 전해질을 사용한 Li/MoS₂ 전지의 충·방전 특성
권정희,유호석,김기원,안주현,정용수,이건환,안효준 한국수소및신에너지학회 2009 한국수소 및 신에너지학회논문집 Vol.20 No.3
We investigated the electrochemical properties of lithium/molybdenum sulfide(Li/MoS₂) using tetra (ethylene glycol) dimethyl ether(TEGDME) electrolyte. The Li/TEGDME/MoS₂ cell showed the first discharge capacity of 288mAhg-1. From the XRD, SEM results of the MoS₂ electrode in various cut-off voltage during charge-discharge process, MoS2 partly changed into Li₂S and Mo during discharge and Li₂S partly recovered into MoS₂ and Li during charge. Full charged MoS₂ electrode showed lump shape of big size, which might be related to agglomerate of MoS₂ particles. Therefore, the degradation might be related to decrease of active material for electrochemical reaction by agglomeration of MoS₂.
Mahmoud Elrouby,Hoda Abd El-Shafy Shilkamy,Abd El-Rahman El-Sayed 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.3
The passivation of pure zinc surface can be considered a problem of Zn utilization as an anode in alkaline batteries due to its small capacity. Therefore, to improve the discharge capacity of the Zn anode, minor Sb alloying with Zn was investigated. The impact of trace Sb alloyed with Zn on the passivity and the breakdown of the colloidal passive film on the surface was studied in concentrated KOH solution utilizing galvanostatic, electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge measurements at the passivated area. The galvanostatic data show that the required time of passivation (tpass.) is greater with increasing small Sb content in the alloy. The obtained results from electrochemical impedance spectroscopy (EIS) reveal that magnitudes of both resistivities of charge transfer (Rct.) and the impedance of Warburg (Zw) decrease, while the magnitude of capacitance of double layer (Cdl.) increases gradually with the increase in addition of small Sb to zinc metal. The evaluated data from the charging-discharging process show that the greatest value of potential height (ΔV) is for Zn-0.5%Sb alloy. Therefore, 0.5%Sb alloying with Zn can increase energy efficiency to a large extent than Zn and alloy II.
SHS합성법에 의한 리튬이온이차전지용 정극활물질 LiMn<sub>2</sub>O<sub>4</sub> 의 제조
장창현,김정한,원창환,Jang, Chang-Hyun,Nersisyan, Hayk,Kim, Jung-Han,Won, Chang-Whan 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.7
A simple and effective method for the synthesis of LiMn$_{2}$O$_{4}$ powder as a cathode material for lithium secondary battery is reported. Micrometer size LiMn$_{2}$O$_{4}$ was prepared by combustion synthesis technique employing initial mixture of l.l LiNO$_{3}$ -1.3Mn-0.7MnO$_{2}$-1NaCl composition. Parametric study of the combustion process including molar ratio of Mn/MnO$_{2}$ and NaCl concentration were carried out under air atmosphere. The combustion products obtained were additionally heat treated at the temperature 900$^{\circ}C$ and the washed by distilled water. The results of charging-discharging characteristics revealed that LiMn$_{2}$O$_{4}$ cell synthesized in the presence of NaCl had a high capacity and much better reversibility than one formed without NaCl An approximate chemical mechanism for LiMn$_{2}$O$_{4}$ formation is proposed.
김영조 한국전기전자재료학회 2014 Transactions on Electrical and Electronic Material Vol.15 No.6
In this study, the use of a discharging process for charged particles is proposed to achieve an ideal electrical balanceor neutralization and to improve the electrical and optical properties of a reflective electronic display. Here, negativelycharged particles (white) and positively charged particles (black) are used. The q/m (charge per mass for a particle)values of the black and white particles are + 4.5 μC/g and -4.5 μC/g, respectively. We compared the movement of thecharged particles by varying their discharging time. Stable movement of the charged particles is obtained with anappropriate discharging time, which resulted in improvements of the optical properties of the panel.
Kim, Young-Cho The Korean Institute of Electrical and Electronic 2014 Transactions on Electrical and Electronic Material Vol.15 No.6
In this study, the use of a discharging process for charged particles is proposed to achieve an ideal electrical balance or neutralization and to improve the electrical and optical properties of a reflective electronic display. Here, negatively charged particles (white) and positively charged particles (black) are used. The q/m (charge per mass for a particle) values of the black and white particles are $+4.5{\mu}C/g$ and $-4.5{\mu}C/g$, respectively. We compared the movement of the charged particles by varying their discharging time. Stable movement of the charged particles is obtained with an appropriate discharging time, which resulted in improvements of the optical properties of the panel.