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A Review of Aluminium/Air Battery
PYUN, Su Il,Moon, Sung Mo 한국부식학회 1997 Corrosion Science and Technology Vol.26 No.1
This article provides general information on the construction and cell reactions of aluminium/air battery and electrochemical properties of aluminium anode for aluminium/air battery in alkaline solutions. The aluminium/air battery system consists of the electrodes of aluminium anode and air cathode, electrolyte management system and the auxiliary system. The performance of aluminium/air battery is largely influenced by the electrochemistry and corrosion properties of the aluminium fuel. Pure aluminium is too reactive to be used directly in highly alkaline solutions. The high reactivity of pure aluminium can be controlled by the additions of alloying elements or electrolyte additives.
A Review of the Cathode Materials for Rechargeable Lithium Battery
PYUN, Su Il,CHOI, Young Min 한국부식학회 1997 Corrosion Science and Technology Vol.26 No.1
This article provides a literature survey on the structure and electrochemical properties of the cathode materials for rechargeable lithium battery. The structures of deintercalated transition metal oxides plays a key role in determining their electrochemical rechargeability. In principle, optimum electrochemical rechargeability can be expected from the structures that expand and contract gradually with minimum change in the unit cell parameters. Many design considerations for rechageable lithium battery involve tradeoffs between performance and safety. When designing rechargeable lithium battery system with safety, thermal stability of electrode materials should be the most important consideration.
A Review of Anodizing of Aluminium
PYUN, Su Il,Moon, Sung Mo 한국부식학회 1997 Corrosion Science and Technology Vol.26 No.1
This article reviewed the structural characteristics and growth kinetics of anodic oxide films on aluminium in aqueous solutions. The structure of anodic oxide film was shown to depend strongly on the electrolyte type and concentration and electrolyte temperature, and the anodic oxide film was divided into thin barrier-type oxide film and thick porous-type oxide film. The growth kinetics of anodic oxide film were described by electrochemical reactions occurring at the aluminium/oxide film and oxide film/electrolyte interfaces based upon point defect model. The formation and dissolution mechanisms of anodic oxide film were discussed in terms of the transports of aluminium vacancy and oxygen vacancy through the oxide film. In addition, coulombic efficiency of oxide film formation and pore nucleation mechanism during anodizing of aluminium, were detailed.
PYUN, Su Il 한국부식학회 1998 Corrosion Science and Technology Vol.27 No.5
This article reviewed the relationship between the structure of carbon as a lithium battery anode and lithium ion intercalation into the host carbon. Lithium ions reversibly intercalate into and deintercalate from graphite electrode. However, electrolyte co-intercalation, which can deteriorate the structure of graphite through the repetitive cycling, can occur in graphitic carbons but not in low-temperature carbons where unorganized carbon and randomly stacked layers `pin' adjacent layers together. As an effort to replace the graphite as a lithium battery anode, carbon with less-developed crystalline structure has been studied extensively. In brief, stacking order of the parallel layers and their spacings play a dominant role in governing lithium ion intercalation.
PYUN, Su Il 한국부식학회 1999 Corrosion Science and Technology Vol.28 No.1
This article first explained the basic concepts of chemical diffusivity D~_(chem) and component diffusivity D_(comp) of cation(ion) in mixed conductor which are of great importance in the area of solid state electrochemistry and then introduced briefly such electrochemical methods to their determination as galvanostatic intermittent titration technique(GITT), potentiostatic intermittent titration technique(PITT) and electrochemical impedance spectroscopy(EIS). Finally this article summarised the results of the investigation on chemical and component diffusivities of lithium ion in Li_δV₂O_5, Li_(1-δ)MO₂(M=Ni,Co) and Li_(1-δ)Mn₂O₄, using those electrochemical techniques reported from our laboratory.
PYUN, Su Il,Lee, Woo Jin 대한금속재료학회(대한금속학회) 2000 METALS AND MATERIALS International Vol.6 No.4
This paper critically evaluates the electrogravimetric curves measured on the thin metal (Fe, Ni, Al and Cu) film electrode/aqueous electrolyte system at our laboratory and elsewhere, to introduce how to apply the principle of electrochemical quartz crystal microbalance technique to the study of such interfacial reactions at electrode/electrolyte as corrosion, passivation and deposition of metals. From the electrogravimetric curve measured on various thin metal film electrode specimens simultaneously with steady state voltammogram, quasi-steady state or transient voltammogram, the interfacial reaction mechanisms of the metals have been proposed.
PYUN, Su Il 대한금속재료학회(대한금속학회) 1999 METALS AND MATERIALS International Vol.5 No.1
In-situ spectroelectrochemical technique has been applied to investigate passivating surface film on porous carbon electrode and plasma enhanced chemical vapour deposited (PECVD) carbon film electrode in organic electrolytic solution consisting of ethylene carbonate (EC) and diethyl carbonate (DEC) solvent, and 1 M LiPF_6 and LiAsF_6. Water impurity with the concentration of 0 M, 0.02 M, 0.05 M, and 0.1 M Hz0 was added to 1 M LiPF_6-EC/DEC solution. In-situ Fourier transform infra-red (FTIR) spectra of the surface film on both electrodes with the constituents of ROCO₂Li, Li₂CO₃, and Li_xPF_y suggested that the reduction of EC to ROCO₂Li runs via a one-electron transfer pathway as a result of diffusion of water through the surface film, and then Li₂CO₃ formation proceeds simultaneously by the chemical reaction of ROCO₂Li with water. From the measured potential dependence of the amount of the salt reduction products, it is suggested that the surface film formed in 1 M LiPF_6-EC/DEC solution gives a poorer passivity as compared with that formed in 1 M LiAsF_6-EC/DEC solution, which is due to the considerable interference of LiPF_6 salt reduction with the compact sedimentation of ROCO₂Li on the electrode. In-situ FTIR spectra of the surface film showed that all the peak intensities of the three constituents significantly increase with increasing water content under application of the negative potentials with respect to open circuit potential (OCP). From these experimental results, the dependence of the passivity of the surface film on the carbon electrode on the water concentration of the electrolyte, as well as on the lithium salt type, was discussed in view of the salt and solvent reactivities.