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자외선 조사에 의한 고체 고분자 전해질의 제조와 이를 채용한 활성탄 수퍼커패시터의 전기화학적 특성
원정하,김용주,이영기,김광만,김종휘,고장면,Won, Jung Ha,Kim, Yong Joo,Lee, Young-Gi,Kim, Kwang Man,Kim, Jong Huy,Ko, Jang Myoun 한국전기화학회 2013 한국전기화학회지 Vol.16 No.2
이온성 액체 전해질염 1-ethyl-3-methylimidazolium tetrafluoroborate ($EMIBF_4$)과 용매 acrylonitrile (ACN) 및 propylene carbonate (PC)와 각각 혼합한 용액에 poly(ethylene glycol)diacrylate (PEGDA)를 45-60 wt.% 첨가하고 자외선 조사를 통해 경화시켜 고체 고분자 전해질 필름을 제조하였다. 이 고체 고분자 전해질 필름을 분리막으로 채택하고 활성탄 전극을 사용하는 수퍼커패시터를 제조하여 그 전기화학적 특성을 사이클릭 볼타메트리와 임피던스 방법으로 조사하였다. 결과적으로 PEGDA를 45 wt.% 첨가하여 제조한 고체 고분자 전해질 필름을 채택한 경우가 스캔속도 $20mVs^{-1}$에서 $46Fg^{-1}$의 가장 우수한 축전용량을 나타내는데, 이것은 PEGDA의 저함량 때문에 상대적으로 자외선 경화가 약하게 진행되어 고분자 전해질 필름의 유연성이 충분히 확보되므로 필름 내 이온전도가 가장 활발히 진행될 수 있었기 때문이다. Solid polymer electrolyte films are prepared by ultraviolet radiation in the mixtures of an ionic liquid salt (1-ethyl-3-methylimidazolium tetrafluoroborate, $EMIBF_4$) and solvent (acetonitrile (ACN) or propylene carbonate(PC)), and an oligomer (poly(ethylene glycol)diacrylate, PEGDA, 45-60 wt.%). Electrochemical properties of activated carbon supercapacitors adopting the solid polymer electrolyte films as a separator are also examined by cyclic voltammetry and impedance measurement techniques. As a result, the supercapacitor adopting the PEGDA as much as 45 wt.% exhibits a superior capacitance of $46Fg^{-1}$ at $20mVs^{-1}$. It seems that this is due to fast kinetics of ion conduction by sufficient film flexibility, which can be allowed by comparatively weak ultraviolet curing of small anount of the PEGDA.
원정하,이해수,Louis Hamenu,라티파,이용민,김광만,오지명,조원일,고장면 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
In this work, poly[dimethylsiloxane-co-(siloxane-g-acrylate)] (PDMS-A) and lithium-modified silicananosalt (Li202) are used together as low-temperature electrolyte additives in lithium-ion batteries(LIBs), taking advantage of the electrochemical and interfacial stabilities due to their surface functionalgroups. Using these additives together improves the electrochemical stability and ionic conductivity ofliquid electrolyte solution to over 5.5 V and 4 10 4 S cm 1 at 20 8C, respectively. The roomtemperatureelectrochemical performance of a conventional LIB (LiCoO2/graphite) is improved by theaddition (e.g., initial discharge capacity of 95.9 mAh g 1 obtained after charging at 1.0 C-rate andconsequent discharging at 5.0 C-rate). The low-temperature performance is also enhanced, achieving acapacity retention ratio of 63.4% after 50 cycles at 20 8C, compared to 38.7% without the additives. It isalso notable that the PDMS unit commonly existing in both additives may be the main cause of thesynergistic effects on the electrochemical performance due to the compatibility between PDMS-A andLi202.
( Louishamenu ),원정하,이해수,( Latifatu Mohammed ),김광만,박종욱,백용구,남현국,고장면 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
In this work, poly[dimethylsiloxane-co-(siloxane-g-acrylate)] (PDMS-A) and lithium-modified silica nanosalt (Li202) are used together as lowtemperature electrolyte additives in lithium-ion batteries (LIBs), taking advantage of the electrochemical and interfacial stabilities due to their surface functional groups. Using these additives together improves the electrochemical stability and ionic conductivity of liquid electrolyte solution to over 5.5 V and 4``10-4Scm-1 at -20°C, respectively. The roomtemperature electrochemical performance of a conventional LIB(LiCoO2/ graphite)is improved by the addition (e.g., initial discharge capacity of 95.9 mAhg-1 obtained after charging at1.0C-rate and consequent discharging at5.0C-rate). The low-temperature performance is also enhanced, achieving a capacity retention ratio of 63.4% after 50cycles at -20°C, compared to 38.7% without the additives.
단신 : 수산화라디칼과 오존에 의한 수중 천연 지방산 분해 제거 연구
( Latifatu Mohammed ),원정하 ( Jung Ha Won ),김용주 ( Yong Joo Kim ),고장면 ( Jang Myoun Ko ),송근한 ( Keun Han Song ),이창훈 ( Chang Hoon Lee ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.4
In order to purify the waste water containing natural fatty oil, hydroxy radical and/or ozone are used to remove the fatty oil dispersed in the waste water. The fatty oil is decomposed by oxidation reaction through hydroxy radical and ozone, and eliminated as a function of first order reaction. It is clearly confirmed that the fatty oil in waste water can be effectively removed much more in the use of both hydroxy radical and ozone than only hydroxy radical as an oxydant. In addition, the decomposition chemical reaction mechanism of the fatty oil by hydroxy radical and ozone is proposed.
하이드로겔 고분자 전해질이 코팅된 술폰화 폴리프로필렌 격리막을 포함하는 활성탄 수퍼커패시터 특성
윤충섭 ( Choong Sub Yoon ),고장면 ( Jang Myoun Ko ),모하메드라티파투 ( Mohammed Latifatu ),이해수 ( Hae Soo Lee ),이영기 ( Young Gi Lee ),김광만 ( Kwang Man Kim ),원정하 ( Jung Ha Won ),조정대 ( Jeong Dai Jo ),장윤석 ( Yun Seok Jang 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.5
Sulfonated polypropylene (S-PP) is prepared by sulfuric acid-acetone aldol condensation reaction of polypropylene(PP) separator to yield hydrophilic separator surface with a moderate amount of -SO3H groups. Activated carbonsupercapacitor is also fabricated adopting the S-PP separator coated with potassium polyacrylate (PAAK) hydrogelpolymer electrolyte. As a result, the hydrophilic surface of S-PP separator involves better physical and electrochemicalproperties such as decrease in contact angle, improvements of wettability, electrolyte uptake, and ionic conductivity togive higher specific capacitance and long cycle-life.