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Advanced Composite Electrodes for Solid State Li-ion Battery
Keywords: Li-Ion Battery, Solid State, Composite Electrodes
All solid state battery has been investigated for next generation electrochemical energy storage system. Several Li+ ion conductive solid electrolyte have been applied to this battery. There are two kinds of ceramics for all solid state battery. One is sulfide and another is oxide. In both case, a composite between active material and solid electrolyte have to be prepared in order to produce a good interface between them. In this report, the fabrication and characterization for the composite with solid oxide electrolyte is presented to show solved problems for realization of all solid electrolyte. An electrochemical reaction rate of composite between active material and solid electrolyte is determined by a contact area and interfacial chemical and physical properties. In this study. Li7La3Zr2O12 (LLZ) was utilized as solid electrolyte and LiCoO2 (LCO) was used as active material. Three dimensional hole-array structure of LLZ was prepared by using photolithography to obtain larger contact area between LLZ and LCO. In addition, in order to control chemical and physical properties of interface between LLZ and LCO, the sol-gel process was employed. The discharge and charge characteristics of the prepared cell were tested using electrochemical methods. The prepared cell exhibited a nice performance at 60C. However, the cell impedance was still large.
Kiyoshi Kanamura,
Tokyo Metropolitan University
Hachioji, Tokyo

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