2021 Volume 89 Issue 3 Pages 273-278
Vanadium tetrasulfide (VS4) have been attracting attention as the promising positive electrode material for next generation batteries because of its high theoretical capacity (1196 mAh g−1). In this study, a typical element (i.e., Phosphorus) was introduced into VS4 for an attempt to improve the electrochemical cycle performance of VS4. The prepared PxVSy showed significant increase in cycle capability; e.g., ca. 70 % after 50 cycles for P0.4VS5.0 sample cell, being much higher than that of pristine VS4 cell (ca. 10 %). The PDF (pair distribution function) analyses indicated that the structural reversibility of VS4 for Li insertion/extraction reactions was improved by the phosphorus addition.