Frontiers | Synthesis, Characterization and ...
May 13, 2021 · For each of the two vanadium phosphate products, g active material (VOP), g carbon, and g PVDF were mixed with 2 mL NMP in a ball mill agate jar. The sealed agate jars were placed in a ball mill machine (Changsha Tianchuang Powder Technology Co., Ltd.) for 1 h at 400 rpm using agate balls (diameter 6 mm).