• Title, Summary, Keyword: Electrolyte Additive

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Role of Sulfone Additive in Improving 4.6V High-Voltage Cycling Performance of Layered Oxide Battery Cathode (층상계 산화물 양극의 4.6V 고전압 특성 향상에서의 Sulfone 첨가제의 역할)

  • Kang, Joonsup;Nam, Kyung-Mo;Hwang, Eui-Hyeong;Kwon, Young-Gil;Song, Seung-Wan
    • Journal of the Korean Electrochemical Society
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    • v.19 no.1
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    • pp.1-8
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    • 2016
  • Capacity of layered lithium nickel-cobalt-manganese oxide ($LiNi_{1-x-y}Co_xMn_yO_2$) cathode material can increase by raising the charge cut-off voltage above 4.3 V vs. $Li/Li^+$, but it is limited due to anodic instability of conventional electrolyte. We have been screening and evaluating various sulfone-based compounds of dimethyl sulfone (DMS), diethyl sulfone (DES), ethyl methyl sulfone (EMS) as electrolyte additives for high-voltage applications. Here we report improved cycling performance of $LiNi_{0.5}Co_{0.2}Mn_{0.3}O_2$ cathode by the use of dimethyl sulfone (DMS) additive under an aggressive charge condition of 4.6 V, compared to that in conventional electrolyte, and cathode-electrolyte interfacial reaction behavior. The cathode with DMS delivered discharge capacities of $198-173mAhg^{-1}$ over 50 cycles and capacity retention of 84%. Surface analysis results indicate that DMS induces to form a surface protective film at the cathode and inhibit metal-dissolution, which is correlated to improved high-voltage cycling performance.

Study on Synthesis of Fine Copper Powder by Electro-refining from Copper Containing Sludge (동(Cu) 함유 슬러지로부터 동 전해정련을 이용한 미세 동 분말 합성에 관한 연구)

  • Lee, Jin-Yeon;Son, Seong Ho;Park, Sung Cheol;Jung, Yeon Jae;Kim, Yong Hwan;Lee, Man-seung
    • Resources Recycling
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    • v.27 no.6
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    • pp.44-52
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    • 2018
  • In this study, copper was recovered from copper containing sludge by selectively controlling electro-refining process conditions in copper sulfate electrolyte solution. Electro-refining process was performed by LSV (Linear Sweep Voltammetry) result according to copper sulfate electrolyte solution concentration, applied current density, additive type and concentration. SEM (Scanning Electron Microscope) and PSA (Particle Size Analyzer) were used to analyze the shape and size of copper powder. In the 0.1 ~ 0.4 M copper sulfate electrolyte solution without organic additives, the copper powder size decreased as the applied current density became closer to the limiting current density and the copper powder size tended to decrease in 0.2 ~ 0.3 M copper sulfate electrolyte solution. In addition, when the shape and size of the copper powder were analyzed by adding various types and concentrations of organic additives to the previous experimental, fine spherical copper powder having the smallest size (nm) was obtained under the condition of cellulose type additive 2,000 ppm.

MnCo2S4/CoS2 Electrode for Ultrahigh Areal Capacitance

  • Pujari, Rahul B.;Lokhande, C.D.;Lee, Dong-Weon
    • Journal of Sensor Science and Technology
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    • v.29 no.4
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    • pp.215-219
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    • 2020
  • MnCo2S4/CoS2 electrode with highly accessible electroactive sites is prepared using the hydrothermal method. The electrode exhibits an areal capacitance of 0.75 Fcm-2 at 6 mAcm-2 in 1 M KOH. The capacitance is further increased to 2.06 Fcm-2 by adding K3Fe(CN)6 and K4Fe(CN)6 (a redox couple) to KOH. This increment is associated with the redox-active properties of cobalt and manganese transition metals, as well as the ion pair of [Fe(CN)6]-3/[Fe(CN)6]-4. The capacitance retention of the MnCo2S4/CoS2 electrode is 87.5% for successive 4000 charge-discharge cycles at 10 mAcm-2 in a composite electrolyte system of KOH and ferri/ferrocyanide. The capacitance enhancement is supported by the lowest equivalent series resistance (0.62 Ωcm-2) of MnCo2S4/CoS2 in the presence of redox additive couple compared with the bare KOH electrolyte.

Inhibition of Hydrogen Formation with Calcium Hydroxide on Zinc Electrode of Film-type Manganese Battery

  • Yun, Je-Jung;Kim, Nam-In;Hong, Chang Kook;Park, Kyung Hee
    • Transactions on Electrical and Electronic Materials
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    • v.16 no.3
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    • pp.135-138
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    • 2015
  • A manganese dioxide (MnO2) layer and zinc (Zn) layer are used as the cathode and the anode to develop filmtype manganese battery, in which a stack of a MnO2 layer, gel electrolyte, and Zn layer are sandwiched between two plastic layers. This paper describes the chemical equation of swelling control upon the film-type manganese battery. We examined the reduction of hydrogen formation, by using calcium hydroxide Ca(OH)2 as an additive in the electrolyte of film-type manganese battery. The phenomena or an effect of reduced hydrogen gas was proven by cyclic voltammogram, X-ray photoelectron spectra (XPS), and volume of hydrogen formation. The amount of H2 gas generation in the presence of Ca2+ ion was reduced from 4.81 to 4.15 cc/g-zinc (14%), and the corrosion of zinc electrode in the electrolyte was strongly inhibited as time passed.

The Effects of a Type and Concentration of Coal and Additive on the Rheological Characteristics of CWM (석탄의 종류, 농도 및 첨가제가 석탄-물 혼합연료의 유동특성에 미치는 영향)

  • Kim, Soo-Ho;Hwang, Kap-Sung;Hong, Song-Sun
    • Applied Chemistry for Engineering
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    • v.8 no.4
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    • pp.640-644
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    • 1997
  • We investigated that how both the type and the concentration of coal and the surfactant and the electrolyte added to increase the fluidity of CWM influence rheological characteristics. According to the type of coal, the viscosity of CWM was increased with increasing O/C ratio. Also, the CWM was represented the property of non-Newtonian fluid, having yield stress which was linerarly increased with increasing coal concentration. According to the surfactant used as an additive, the rheological characteristics of CWM was represented the pseudoplastic property as n<1 without relating to the concentration of added surfactants. Also, according to the increase of the amount of electrolyte, n was nearly approached 1. Therfore, we found that CWM opproched Newtonian fluid and that when more than 0.05wt.% of electrolyte were added, yield stress was not shown up.

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The Effect of Fillers on Rubber Characteristics for Gasket to Lithium Ion Battery (리튬이온 전지용 가스켓 고무의 특성에 미치는 충전제의 영향)

  • Seo, Kwan-Ho;Cho, Kwang-Soo;Yun, In-Sub;Choi, Woo-Hyuk;Hur, Byung-Ki;Kang, Dong-Gug
    • Polymer(Korea)
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    • v.34 no.5
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    • pp.430-433
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    • 2010
  • The gasket materials of for the lithium ion battery requires chemical resistance to electrolyte, electrical insulating, compression set, anti-contamination and low temperature property. To check the special characteristics of fillers which are applied to rubber for gasket, compound of EPDM, NBR and FKM (fluoro elastomer) were made by adjusting weights of carbon black and silica additive. Using these compounds, we had done tests of long-term stability against electrolyte, compression set and low-temperature property with considering operating condition of the lithium ion battery. From this test, we investigated the physical and chemical characteristics of rubber with using of carbon black and silica additive in each.

Effect of Additives on the Physical Properties and Surface Morphology of Copper Foil (첨가제에 의한 구리 박막의 표면형상과 물성변화)

  • Woo, Tae-Gyu;Park, Il-Song;Park, Eun-Kwang;Jung, Kwang-Hee;Lee, Hyun-Woo;Seol, Kyeong-Won
    • Korean Journal of Metals and Materials
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    • v.47 no.9
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    • pp.586-590
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    • 2009
  • The effects of additives on the surface morphology and physical properties of copper electrodeposited on polyimide(PI) film were investigated here. Two kinds of additives, an activator(additive A) and a leveler(additive B),were used in this study. Electrochemical experiments, in conjunction with scanning electron microscopy(SEM), X-ray diffraction(XRD) and a four-point probe, were performed to characterize the morphology and mechanical characteristics of copper electrodeposited in the presence of the additives. The surface roughness, crystal growth orientation and resistivity could be controlled using various quantities of additive B. High resistivity and lower peel strength were observed on the surface of the copper layer electroplated onto the electrolyte with no additive B. However, a uniform surface, lower resistivity and high flexibility were obtained with a combination of 20 ppm of additive A and 100 ppm of additive B.

Properties of Capacity on Carbon Electrode in EC : MA Electrolyte II. Effect of Additives on Initial Irreversible Capacity (EC : MA 혼합전해질에서 카본 전극의 용량 특성 II. 초기 비가역 용량에 대한 첨가제의 효과)

  • Park, Dong-Won;Kim, Woo-Seong;Son, Dong-Un;Choi, Yong-Kook
    • Applied Chemistry for Engineering
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    • v.17 no.6
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    • pp.575-579
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    • 2006
  • Solid electrolyte interface is formed on a carbon electrode used as an anode in Li-ion battery, which can be of $Li^{+}$ intercalation/deintercalation during the first cycle. The passivation film formed by a solvent decomposition during the initial charge process affects cell performance and it was one of the main reason of an initial irreversible capacity. This paper describes the use, for the first time, of $Li_2CO_3$ as the additive for the formation of a passivation film on the carbon surface to suppress the initial irreversible reaction. Chronopotentiometry, cyclic voltammetry, and impedance spectroscopy were used to investigate the effects of the $Li_{2}CO_{3}$ additive. Scanning electron microscopy, energy dispersive X-ray analysis, and X-ray diffraction were also used to monitor changes in the surface morphology and composition of the passivation film formed by solvent decomposition and the precipitation of $Li_{2}CO_{3}$. The addition of $Li_{2}CO_{3}$ to a solution of 1 M $LiPF_{6}$/EC:MA (1:3, v/v) resulted in a decrease in the initial irreversible capacity and it was due to the suppression of the solvent decomposition on the electrode surface.

Properties of electrodeposited copper foil by organic compounds (유기물 첨가에 의한 전해동박의 특성)

  • Lee, K.W.;No, S.S.;Choi, C.H.;Kim, S.K.;Son, S.H.;Moon, H.K.;Park, D.H.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.88-91
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    • 2001
  • The mechanical properties and surface luminous intensities of copper foil have been studied with variation of the amount of additives into the electrolyte. Especially, organic compound of HEC was added from 0.1 to 10ppm for the propose of increasing the mechanical property and the surface state. The total thickness of electrodeposited copper foil was decreased with increasing the amount of organic compounds. There was not so much significant effect of the current density. It has been observed that mechanical property and surface luminous intensity increase with increasing concentration of organic compounds.

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Lithium Diffusivity of Tin-based Film Model Electrodes for Lithium-ion Batteries

  • Hong, Sukhyun;Jo, Hyuntak;Song, Seung-Wan
    • Journal of Electrochemical Science and Technology
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    • v.6 no.4
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    • pp.116-120
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    • 2015
  • Lithium diffusivity of fluorine-free and -doped tin-nickel (Sn-Ni) film model electrodes with improved interfacial (solid electrolyte interphase (SEI)) stability has been determined, utilizing variable rate cyclic voltammetry (CV). The method for interfacial stabilization comprises fluorine-doping on the electrode together with the use of electrolyte including fluorinated ethylene carbonate (FEC) solvent and trimethyl phosphite additive. It is found that lithium diffusivity of Sn is largely dependent on the fluorine-doping on the Sn-Ni electrode and interfacial stability. Lithium diffusivity of fluorine-doped electrode is one order higher than that of fluorine-free electrode, which is ascribed to the enhanced electrical conductivity and interfacial stabilization effect.