Icpyo Kim

LiNi0.4Co0.3Mn0.3O2 thin film electrode by aerosol deposition

LiNi0.4Co0.3Mn0.3O2 thin film electrodes are fabricated from LiNi0.4Co0.3Mn0.3O2 raw powder at room temperature without pretreatments using aerosol deposition that is much faster and easier than conventional methods such as vaporization, pulsed laser deposition, and sputtering. The LiNi0.4Co0.3Mn0.3O2 thin film is composed of fine grains maintaining the crystal structure of the LiNi0.4Co0.3Mn0.3O2 raw powder. In the cyclic voltammogram, the LiNi0.4Co0.3Mn0.3O2 thin film electrode shows a 3.9-V anodic peak and a 3.6-V cathodic peak. The initial discharge capacity is 44.6 μAh/cm2, and reversible behavior is observed in charge-discharge profiles. Based on the results, the aerosol deposition method is believed to be a potential candidate for the fabrication of thin film electrodes.

Electrochemical properties of magnesium electrolyte with organic solvent

Three kinds of electrolytes are investigated to find out the proper electrolyte for magnesium battery. Propylene carbonate electrolyte using magnesium salt of Mg(ClO4)2 shows a higher ionic conductivity than that of dimethyl carbonate and tri(ethyleneglycol dimethyl)ether (TRGDME) but low decomposition potential. The TRGDME electrolyte with 0.5?M Mg(ClO4)2 has a higher ionic conductivity of 6 ? 10?4 ?S?cm?1 than that of dimethyl carbonate, but the decomposition voltage of the electrolyte is over 3.0?V which can be used for Mg/S cell.

Discharge properties of a lithium/sulfur cell at body temperature

To investigate the feasibility of a Li/S cell for application to medical devices, the discharge properties of Li/S cells were investigated at 36.5??C. A Li/S cell has the first discharge capacity 1158?mA?h?(g-S)?1 at body temperature, whose cathode is composed of sulfur, carbon black and PVdF. The Li/S cells were discharged at various current densities to evaluate the rate capability, and the cycle performance at 100?mA?g?1 current density was also studied compared with previous reports.

Initial Discharge Behavior of an Ultra High Loading 3D Sulfur Cathode for a Room-Temperature Na/S Battery.

A 3D sulfur cathode for a large-scale room-temperature (RT) Na/S battery with a high sulfur loading of 14.63 mg cm-2 was fabricated. The first discharge was tested in order to understand the macroscopic changes. A first discharge capacity of 865 mAh g-1 was obtained at 1/1000 C-rate along with a discharge curve with two clear plateaus at 2.29 V and 1.78 V, respectively. A visual change occurs in the 3D sulfur cathode. A thick layer of discharge products at the solid electrolyte separator face of the 3D sulfur cathode was observed and analyzed using a scanning electron microscope (SEM) coupled with energy dispersive X-ray spectroscopy (EDS).

Electrochemical Properties of PVdF Gel Polymer Electrolyte with Plasticizer for Lithium/sulfur Battery

In order to find out proper PVdF gel polymer electrolyte for Li/S battery, we investigated PVdF gel polymer electrolytes with various glyme type plasticizer such as polyglyme, tetraglyme, triglyme. The organic solvents as triglyme, tetraglyme, polyglyme (Mn