Green synthesis of polypyrrole coated manganesee(II) vanadate nanoflower composite as cathode materials

Abstract

Flower-like Mn(VO3)2 precursors were synthesized by a hydrothermal method. Then they were wrapped by Polypyrrole (PPy) to obtain uniform Mn(VO3)2 @PPy nanoflower composites, which were consist of nanosheets with a length of 150-300 nm and covered with a layer of PPy. The Mn(VO3)2 @PPy nanoflower composites had a discharge capacity of 102.6 mAh g-1 range of 1.5-4.5 V at a current density of 0.1 A g-1 and a specific discharge capacity of 75.3 mAh g-1 range of 1.5-4.5 V when the current density was 1 A g-1. After 500 cycles, their coulomb efficiency was close to 100%, exhibiting good cycle performance. These results indicated that the Mn(VO3)2 @PPy nanoflower composites are promising as a lithium ion cathode material with good recycling performance.