Release time:2021-03-15 Hits:
- Key Words:Secondary batteries;Electrodes - Energy storage - Hydrothermal synthesis - Microspheres - Zinc compounds
- Abstract:In this work, 3D microsphere Zn<inf>2</inf>V<inf>2</inf>O<inf>7</inf> is obtained by calcined the precursor Zn<inf>3</inf>(OH)<inf>2</inf>V<inf>2</inf>O<inf>7</inf>·2H<inf>2</inf>O. The 3D structure of Zn<inf>2</inf>V<inf>2</inf>O<inf>7</inf> inherits from the precursor which is composed by layered structures with nanoparticles fully covered. The unique structure endows it higher specific surface area and porous structure. Benefitting from the structure stability and the synergistic effect of the mixed metal oxides, the Zn<inf>2</inf>V<inf>2</inf>O<inf>7</inf> electrode shows high specific capacity of 84.8 mAh g<sup>−1</sup> at 1 A g<sup>−1</sup>, good rate capability and long cycle life. In addition, the battery-supercapacitors hybrid device is assembled with Zn<inf>2</inf>V<inf>2</inf>O<inf>7</inf> as positive electrode and AC as negative electrode. The device shows high cycling stability with 89.8% retention after 6000 cycles and maximum energy density of 34.99 Wh kg<sup>−1</sup> at 850 W kg<sup>−1</sup>. The high specific capacity and energy density suggest that 3D Zn<inf>2</inf>V<inf>2</inf>O<inf>7</inf> microsphere electrode material is suitable for application in the field of alkaline rechargeable battery.<br/> © 2019 Elsevier B.V.
- Volume:439
- Translation or Not:no
