Bionic Flower-Shaped Nise2-Cose2coated Bypolypyrrole Towardsexcellent Sodium Ion Storage

Abstract

Metal selenides have attracted much attention in sodium ion batteries due to their low cost, environmental friendliness and high theoretical capacity. In this paper, a simple preparation of porous bionic flower-shaped NiSe2-CoSe2 composite materials encapsulated in PPy (NiSe2-CoSe2@PPy) as a high performance sodium ion batteries (SIBs) anode material was demonstrated, which provides excellent rate capability of 497.9 mA h g-1 at 0.1 A g-1 after 200 cycles and good cycling stability (226 mA h g-1 at 2 A g-1 after 900 cycles). This work provides an effective nanostructure design strategy and a kind of promising high-performance bimetallic material for energy storage.

Keywords: Sodium ion batteries, Flower-shaped, Composite materials, nanostructure