Abstract
Cathodic performance of six different VOPO 4 phases for Li ion rechargeable battery was investigated. It was found that VOPO 4 exhibits a high flat discharge potential of 3.7 V for Li ion electrochemical intercalation and de-intercalation excepting for β- and ε-types. On the other hand, slightly higher flat discharge potential of 3.9 and 3.8 V was observed for β- and ε-types. Capacity for Li intercalation is strongly related with the crystal structure of VOPO 4. In particular, δ-phase exhibits the largest reversible capacity of ca. 130 mAh/g among the examined VOPO 4. High capacity for Li intercalation in δ-phase VOPO 4 hardly decreased over 30 times of charge and discharge cycles. Although the reversible capacity decreased with increasing the current density for charge and discharge, large capacity of 80 mAh/g was still sustained at 0.4 mA/cm 2 for δ-type VOPO 4.
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