120th General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Analytical Chemists I
Room No. Room C311+C312
Time THU 09:44-:
Code ANAL1.O-15
Subject Study of electrochemical properties for porous Li3V2(BO3)3/C as a cathode material its characterization using MAS NMR for Li-ion batteries
Authors Ji Won Lee, CHAEWON Moon, YOUNGIL LEE*
Department of Chemistry, University of Ulsan, Korea
Abstract Recently, poly-anion based compounds such as phosphates, silicates and borates as cathode materials for Li-ion battery have been developed for using in individual IT device, electric vehicles, and high energy storage systems have been investigated due to low cost and structural stability. Among these compounds, monoclinic Li3V2(PO4)3/C (LVP) has good thermal stability, structure stability and the highest theoretical specific capacity of 197 mAh g-1 in the potential range of 3.0 – 4.8 V. However, LVP has low electronic conductivity and Li-ion diffusion coefficient (10-8 to 10-14 cm2 s-1). So, we have attempted to fully exchange the phosphate to the borate in order to improve specific discharge capacity. This material has been synthesized by combustion synthesis method and the morphology, compositions and electrochemical performance of the synthesized sample were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Cycling test and Galvanostatic charge-discharge measurement and mainly mainly analyzed the structure character using solid-state MAS NMR. As a result, we demonstrates the electrochemical performances of a highly porous Li3V2(BO3)3/C, synthesized via combustion synthesis as a new cathode material with a wide range voltage operability of 0.9 to 4.5 V which delivered exceptionally high discharge capacity 257 mAhg-1 at 0.05 C, 95.6% of its theoretical capacity.
E-mail wldnjs469090@gmail.com