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Poly(acrylonitrile)- L1계 폴리머 전해질의 전기화학적 성질
전해수,김형선,윤경석,조병원 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.1
Polyacrylonitrile(PAN) 매트릭스에 LiClO₄, LiAsF_6, LiBF₄, LiPF_6 등의 리튬염과 ethylene carbonate(EC) propylene carbonate(PC)유기용매 등이 캡슬화된 폴리머 전해질의 전기화학적인 특성을 조사하였다. 모든 조성의 폴리머 전해질의 이온 전도도는 상온에서 10^(-3)-10^(-4)s/㎝범위를 나타냈다. 리튬 전극과 폴리머 전해질간의 시간에 따른 계면 저항은 EC/PC의 유기용매비가 75:25일 때 가장 안정한 것으로 나타났다. 이 용매비에서 LiPF_6 리튬염을 갖는 폴리머 전해질의 이온 전도도 및 계면 저항은 시간에 따라 안정한 값을 보였다. 이 전해질은 4.3V(vs. Li^+/Li)까지 전기화학적으로 안정하였고 따라서 리튬 폴리머 전지에 적용 가능한 것으로 나타났다. 폴리머 전해질들에서 리튬 이온의 확산계수는 4×10^(-7) ㎠/sec이며 교환 전류밀도는 시간에 따라 감소하는 것으로 나타났다. The electrochemical properties of polymer electrolyte encapsulated LiClO₄, LiAsF_6, LiBF₄, LiPF_6 lithium salts and ethylene carbonate(EC), propylene carbonate(PC) organic solvent in polyacrylonitrile(PAN) matrix were investigated. The ionic conductivity of polymer electrolyte of all the composition showed in the range 10^(-3)-10^(-4)s/㎝ at room temperature. The interfacial resistance between lithium electrode and polymer electrolyte with time was the most stable when EC/PC organic solvent ratio is 75 : 25. The ionic conductivity and interfacial resistance of polymer electrolyte containing lithium salt LiPF_6 in this solvent ratio showed stable value with storage time. This electrolyte was electrochemically stable up to 4.3 V(vs. Li^+/Li), so that it could be apply to lithium polymer battery. The diffusion coefficient of lithium ion in polymer electrolytes was 4×10^(-7) ㎠/sec and the exchange current density decreased with time.
전해수,이제근 ( Hai Soo Chun,Jea Keun Lee ) 한국화학공학회 1978 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.16 No.1
Fluid-solid fluidized bed reactors may be classified by various types according to kinds of contacting of solids by fluid, operating conditions, the dynamic behaviour of the solids, or the mode of solid movement(circulation). The fluid-solid fluidized system which belong to the first(kinds of contacting of solids by fluid) divide into two categories, so-called $quot;an aggregative fluidized bed, or a bubbling fluidized bed$quot; and $quot;a particulate fluidized bed, or a homogeneously fluidized bed$quot;. The former is industrial importance for many gas-solid reactions. Many two-phase reactor models have been proposed in. an effort to predict chemical conversions in aggregative fluidized beds(or gas-fluidized beds) . In this paper the assumptions underlying these models are considered, and it is show en their characteristics of some models. In recent years a considerable amount of work has been carried out on electrodepositions, batteries and preparations of chemicals using electrochemical fluidized bed reactors(fluidized bed electrode), one of particulate fluidized beds. It is consists of a bed of conducting particles fluidized by the upward flow of electrolyte through some form of distributor and all bed-particles act as an electrode. The basic principles of the fluidized bed electrode and their characteristics are also reviewed here.