Raman spectra and rate capability of graphite anode for lithium ion battery

We have studied the relationship between reversible capacity (Q(rev)) of gr aphite materials for lithium ion battery anode and their fundamental physic al properties, such as interlayer spacing d(infinity 2), crystalline sizes along the c-axis and the a-axis, Le and La, respectively, obtained by X-ray diffraction (XRD), particle size, R value (intensity ratio of a peak inten sity around 1360 cm(-1) and that around 1600 cm(-1)) by Raman spectroscopy and the amount of impurities. The Q(rev) decreased with increasing current density and in charge-discharge measurement. The capacity ratio (Q(ratio)) to Q(rev) for lithium extraction depends on the Raman R value. We have foun d that the rate capability for the Q(rev) was influenced by the structure o f graphite defined by Raman parameter (R value).