Uniform Nickel Vanadate (Ni3V2O8) Nanowire Arrays Organized by Ultrathin Nanosheets with Enhanced Lithium Storage Properties.

Chang Wang,Zhiping Luo,Yunhe Cao,Chuanxi Xiong,Guangzhong Li,Weilin Xu,Hong’En Wang,Xiaoqing Liu,Dong Fang,Ming Jiang

doi:10.1038/srep20826

Abstract

Development of three-dimensional nano-architectures on current collectors has emerged as an effective strategy for enhancing rate capability and cycling stability of the electrodes. Herein, a novel type of Ni3V2O8 nanowires, organized by ultrathin hierarchical nanosheets (less than 5 nm) on Ti foil, has been obtained by a two-step hydrothermal synthesis method. Studies on structural and thermal properties of the as-prepared Ni3V2O8 nanowire arrays are carried out and their morphology has changed obviously in the following heat treatment at 300 and 500 °C. As an electrode material for lithium ion batteries, the unique configuration of Ni3V2O8 nanowires presents enhanced capacitance, satisfying rate capability and good cycling stability. The reversible capacity of the as-prepared Ni3V2O8 nanowire arrays reaches 969.72 mAh·g−1 with a coulombic efficiency over 99% at 500 mA·g−1 after 500 cycles.

Highlights

Development of three-dimensional nano-architectures on current collectors has emerged as an effective strategy for enhancing rate capability and cycling stability of the electrodes
We present an efficient two-step hydrothermal synthesis method to synthesize Ni3V2O8 nanowire arrays organized by ultrathin nanosheets
The as-prepared Ni3V2O8 nanowire arrays are annealed in air, interesting, the nanosheets on the nanowires transfer to nanoparticles after heat treatment at 300 °C, and the nanowires change to porous or tubular structure after annealing at 500 °C

Summary

Introduction

Development of three-dimensional nano-architectures on current collectors has emerged as an effective strategy for enhancing rate capability and cycling stability of the electrodes. Lithium ion batteries (LIBs) are deemed among the best choices owing to their high specific energy and long cycle life in portable electronic consumer devices, electric vehicles, and large-scale electricity storage in intelligent grids[2,3,4]. It has led the extensive research efforts on the development of electrode materials with higher specific capacity. The main challenges to implement NiO based anodes are their low electronic conductivity and large volume change during lithium insertion and extraction as mentioned above To address these issues, binary metal oxides, such as NiMn2O426, and NiCo2O427, have been proposed as anode materials to improve their electrochemical performances. As an electrode material for LIBs, the as-grown Ni3V2O8 nanowires on Ti foil present outstanding energy storage properties

Methods

Results

Conclusion