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Vol. 10 No. 1 (2018)

Microwave-Assisted Synthesis of NiCo2O4 Double-Shelled Hollow Spheres for High-Performance Sodium Ion Batteries

https://doi.org/10.1007/s40820-017-0164-2
Xiong Zhang
School of Chemical Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
Yanping Zhou
School of Electronics and Information Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
Bin Luo
School of Electronics and Information Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
Huacheng Zhu
School of Electronics and Information Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
Wei Chu
School of Chemical Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
Kama Huang
School of Electronics and Information Engineering, Sichuan University, Chengdu 610065, People’s Republic of China

Corresponding Author: Wei Chu

chuwei1965@scu.edu.cn

Nano-Micro Letters, Vol. 10 No. 1 (2018), Article Number: 13

Abstract

The ternary transitional metal oxide NiCo2O4 is a promising anode material for sodium ion batteries due to its high theoretical capacity and superior electrical conductivity. However, its sodium storage capability is severely limited by the sluggish sodiation/desodiation reaction kinetics. Herein, NiCo2O4 double-shelled hollow spheres were synthesized via a microwave-assisted, fast solvothermal synthetic procedure in a mixture of isopropanol and glycerol, followed by annealing. Isopropanol played a vital role in the precipitation of nickel and cobalt, and the shrinkage of the glycerol quasi-emulsion under heat treatment was responsible for the formation of the double-shelled nanostructure. The as-synthesized product was tested as an anode material in a sodium ion battery, was found to exhibit a high reversible specific capacity of 511 mAh g−1 at 100 mA g−1, and deliver high capacity retention after 100 cycles.


Highlights:


1 NiCo2O4 double-shelled hollow spheres were successfully synthesized via a rapid microwave-assisted solvothermal method in isopropanol with the aid of glycerol.
2 The roles of isopropanol, nitrate, glycerol, and the heating rate in the formation of the double shelled hollow spheres were systematically studied.
3 The as-synthesized NiCo2O4 double shelled hollow spheres showed good sodium storage performance with reversible specific capacity of 511 mAh g−1 at 100 mA g−1.

Keywords

NiCo2O4 Double-shelled hollow sphere Microwave Sodium ion battery
Zhang, Xiong, Yanping Zhou, Bin Luo, Huacheng Zhu, Wei Chu, and Kama Huang. 2017. “Microwave-Assisted Synthesis of NiCo2O4 Double-Shelled Hollow Spheres for High-Performance Sodium Ion Batteries”. Nano-Micro Letters 10 (1):13. https://doi.org/10.1007/s40820-017-0164-2.
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