Ni/Bi battery based on Ni(OH)(2) nanoparticles/graphene sheets and Bi2O3 rods/graphene sheets with high performance

摘要

Two kinds of graphene-based composite materials of Ni(OH)(2) nanoparticles/graphene sheets (Ni(OH)(2)/GS) and Bi2O3 rods/graphene sheets (Bi2O3/GS) were respectively synthesized by chemical bath deposition. Morphological and structural analysis by field-emission scanning electron microscopy, transmission electron microscope, X-ray diffraction and X-ray photoelectron spectroscopy confirmed the successful composite of GS with the metal compounds. Then, a high performance Ni/Bi battery was designed and fabricated using the Bi2O3/GS hybrid material as negative electrode and Ni(OH)(2)/GS as positive electrode. As a result, this Ni/Bi battery delivers a high discharge capacity of 102 mA h g (1) at 1 C and good rate capability. A high energy density of 83.2 W h kg (1) is also achieved at a power density of 143 W kg (1) and can still maintain a high level of 60.1 W h kg (1) at 2609 W kg (1), illustrating that this Ni/Bi battery is a promising candidate as energy storage devices. (C) 2015 Elsevier B.V. All rights reserved.