Volume 55

Facile construction of ZnNi2O4 materials as high-performance anode for lithium-ion capacitors Xinrong Lv, Junsheng Zheng

Abstract

In this paper, a ZnNi2O4 anode material is prepared by a simple hydrothermal reaction process for lithium-ion capacitors. Bimetallic oxides exhibit excellent specific capacity and cycle stability based on redox reactions of different metals. The morphology, composition and structure of ZnNi2O4 are characterized by X-ray diffraction, transmission electron microscope and X-ray photoelectron spectroscopy. At a current density of 0.1 A g-1, the ZnNi2O4 has a high initial specific capacity of 1244.73 mAh g-1. Even when the current density is 1 A g-1, the specific capacity of ZnNi2O4 is still as high as 342.41 mAh g-1. It is worth noting that the excellent electrochemical results indicate that ZnNi2O4 is a promising anode candidate for lithium-ion capacitors.

Keywords ZnNi2O4, bimetallic oxides, lithium-ion capacitor, anode material