Low-defect Na^sub 2^Co[Fe(CN)^sub 6^] synthesized by a facile electrostatic spray assisted coprecipitation method as cathode for sodium-ion batteries

• Published in: Electrochimica acta 2018-05, Vol.272, p.44
• Main Authors: Ma, Xiao-Hang, Wei, Yi-Yong, Zhou, Jia-Feng, Zhou, Jia-Hao, Zhao, Shu-Wen, Jia, Wei, Dai, Jian-Ming, Zi, Zhen-Fa
• Format: Article
• Language: English
• Subjects: Batteries; Chemical compounds; Coprecipitation; Cycles; Defects; Electric properties; Electrochemical analysis; Electrodes; Iron; Nanoparticles; Rechargeable batteries; Scanning electron microscopy; Sodium-ion batteries; Synthesis; Thermogravimetric analysis; Transmission electron microscopy; X-ray diffraction
• ISSN: 0013-4686; 1873-3859

The Na2Co[Fe(CN)6] nanoparticles with a low content of Fe(CN)6 defects and coordinating water are synthesized by a facile electrostatic spray assisted coprecipitation (ESAC) method. X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, elemental analysis and galvanostatic cell cycling are used to characterize the structure and electrochemical performance of the Na2Co[Fe(CN)6] nanoparticles. The results show that the structure and electrochemical performance of the Na2Co[Fe(CN)6] electrodes are influenced significantly by the content of Fe(CN)6 defects and coordinating water. Na2Co[Fe(CN)6] nanoparticles obtained by ESAC method exhibit excellent electrochemical performance, which deliver a high initial coulombic efficiency of 89.3%, stable cycling performance with a reversible capacity of 104 mAh g−1 after 100 cycles and high rate capability of 75 mAh g−1 at 500 mA g−1.