Synthesis and Raman Study of Hollow Core-Shell Ni_1.2Co_0.8P@N-C as an Anode Material for Sodium-Ion Batteries

Authors

Jia-hui CHEN, 1. College of Physical Science and Technology, Xiamen University, Xiamen 361005, Fujian, China;
Xiao-bin ZHONG, 2. State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Chao HE, 1. College of Physical Science and Technology, Xiamen University, Xiamen 361005, Fujian, China;
Xiao-xiao WANG, 2. State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Qing-chi XU, 1. College of Physical Science and Technology, Xiamen University, Xiamen 361005, Fujian, China;Follow
Jian-feng LIFollow

Corresponding Author

Qing-chi XU(xuqingchi@xmu.edu.cn);
Jian-feng LI(li@xmu.edu.cn)

Abstract

With the increasing demand for large-scale energy storage, great progress has been made in discovering new advanced energy storage materials. Sodium-ion batteries (SIBs) have attracted much attention in recent years due to their use of abundant sodium resources and their comparable electrochemical capacity to lithium-ion batteries (LIBs). In this paper, we developed novel hollow core-shell Ni-Co bimetallic phosphide nanocubes with N-doped carbon coatings (Ni_1.2Co_0.8P@N-C) as the anode material for SIBs. The material was synthesized through a low-temperature phosphorization method using resorcinol formaldehyde (RF) resin coating with a Ni-Co Prussian blue analogue (PBA) as a template and a subsequent thermal annealing process. The size of the as-obtained nanocubes was about 310 nm with a 19 nm N-doped carbon shell. When used as the anode material of SIBs, Ni_1.2Co_0.8P@N-C exhibited the excellent electrochemical cycling stability and demonstrated an especially high coulombic efficiency of 99.3%, even after 200 cycles with current density of 100 mA·g^-1. Furthermore, in-situ Raman spectroscopy was used to investigate the electrode material in order to understand the electrochemical processes in the N-doped carbon shell of Ni_1.2Co_0.8P@N-C. The results showed that the intercalation and de-intercalation behavior of sodium ions in the N-doped carbon shell was almost reversible, providing valuable information about the charge and discharge processes in SIBs for the follow-up electrochemical studies.

Graphical Abstract

Keywords

sodium-ion batteries, anode material, bimetallic phosphide, hollow core-shell structure, N-doped carbon, Raman spectroscopy

DOI Link

https://doi.org/10.13208/j.electrochem.190318

Publication Date

2020-06-28

Online Available Date

2019-04-08

Revised Date

2019-04-05

Received Date

2019-03-18

Recommended Citation

Jia-hui CHEN, Xiao-bin ZHONG, Chao HE, Xiao-xiao WANG, Qing-chi XU, Jian-feng LI. Synthesis and Raman Study of Hollow Core-Shell Ni_1.2Co_0.8P@N-C as an Anode Material for Sodium-Ion Batteries[J]. Journal of Electrochemistry, 2020 , 26(3): 328-337.
DOI: 10.13208/j.electrochem.190318
Available at: https://jelectrochem.xmu.edu.cn/journal/vol26/iss3/8