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Journal of Electrochemistry ›› 2020, Vol. 26 ›› Issue (3): 328-337.  doi: 10.13208/j.electrochem.190318

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Synthesis and Raman Study of Hollow Core-Shell Ni1.2Co0.8P@N-C as an Anode Material for Sodium-Ion Batteries

CHEN Jia-hui1, ZHONG Xiao-bin2, HE Chao1, WANG Xiao-xiao2, XU Qing-chi1*(), LI Jian-feng1,2*()   

  1. 1. College of Physical Science and Technology, Xiamen University, Xiamen 361005, Fujian, China
    2. State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
  • Received:2019-03-18 Revised:2019-04-05 Online:2020-06-28 Published:2019-04-08
  • Contact: XU Qing-chi,LI Jian-feng E-mail:xuqingchi@xmu.edu.cn;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 (Ni1.2Co0.8P@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, Ni1.2Co0.8P@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 Ni1.2Co0.8P@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.

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

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