Cycle performance of the Lithium Ion Battery(LIB) with hard carbon made from petroleum pitch as an anode active material was compared to soft carbon. To investigate the better cycle performance with the hard carbon than the soft carbon, the structures of each carbon before and after charge-discharge cycles were analyzed by X-ray diffraction (XRD) method. Scattering intensity showed that the hard carbon had no destruction of the bulk structure after 200 charge-discharge cycles, while the soft carbon had destruction. Also, structural stability of the hard carbon during Li+ insertion process was confirmed by measuring ex situ X-ray scattering intensities at the different state of charge. This bulk structural stability of the hard carbon seems to be intrinsically advantageous characteristics to achieve long lifetime performance of LIB and suitable for use in Hybrid Electric Vehicle.
展开▼
