Effective enhancement of the electrochemical properties for Na2FeP2O7/C cathode materials by boron doping

doi:10.1016/j.cjche.2021.09.011

中国化学工程学报 ›› 2021, Vol. 39 ›› Issue (11): 277-285.DOI: 10.1016/j.cjche.2021.09.011

• Energy Science and Technology • 上一篇下一篇

Effective enhancement of the electrochemical properties for Na₂FeP₂O₇/C cathode materials by boron doping

He Zhao^1,2, Jianzhong Li^1,2, Haoyuan Xu^1,2, Xuanwen Gao¹, Junjie Shi^1,2, Kai Yu¹, Xueyong Ding¹

1 School of Metallurgy, Northeastern University, Shenyang 110819, China;
2 Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Shenyang 110819, China

收稿日期:2021-04-15 修回日期:2021-08-11 出版日期:2021-11-28 发布日期:2021-12-27
通讯作者: Jianzhong Li
基金资助:
This work was supported by the National Key Research and Development Program of China (2019YFE0123900) and the National Natural Science Foundation of China (51974069)

Effective enhancement of the electrochemical properties for Na₂FeP₂O₇/C cathode materials by boron doping

He Zhao^1,2, Jianzhong Li^1,2, Haoyuan Xu^1,2, Xuanwen Gao¹, Junjie Shi^1,2, Kai Yu¹, Xueyong Ding¹

1 School of Metallurgy, Northeastern University, Shenyang 110819, China;
2 Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Shenyang 110819, China

Received:2021-04-15 Revised:2021-08-11 Online:2021-11-28 Published:2021-12-27
Contact: Jianzhong Li
Supported by:
This work was supported by the National Key Research and Development Program of China (2019YFE0123900) and the National Natural Science Foundation of China (51974069)

摘要/Abstract

摘要： In recent years, the composite materials based on polyanionic frameworks as secondary sodium ion battery electrode material have been developed in large-scale energy storage applications due to its safety and stability. The Na₂FeP₂O₇/C (theoretical capacity 97 mA·h·g^-1) is recognized as optimum Na-storage cathode materials with a trade-off between electrode performance and cost. In the present work, The Na₂FeP₂O₇/C and boron-doped Na₂FeP_2-BO₇/C composites were synthesized via a novel method of liquid phase combined with high temperature solid phase. The non-metallic element B doping not only had positive influence on the crystal structure stability, Na⁺ diffusion and electrical conductivity of Na₂FeP₂O₇/C, but also contributed to the high-value recycling of B element in waste borax. The structure and electrochemical properties of the cathode material were investigated via X-ray diffraction (XRD), scanning electron microscopy (SEM), The X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and charge/discharge cycling. The results showed that different amounts of boron doping had positive effects on the structure and electrochemical properties of the material. The initial charge/discharge performances of born doped materials were improved in comparison to the bare Na₂FeP₂O₇/C. The cycle performance of the Na₂FeP_1.95B_0.05O₇/C showed an initial reversible capacity of 74.8 mA·h·g^-1 and the high capacity retention of 91.8% after 100 cycles at 1.0 C, while the initial reversible capacity of the bare Na₂FeP₂O₇/C was only 66.2 mA·h·g^-1. The improvement of apparent Na⁺ diffusion and electrical conductivity due to B doping were verified by the EIS test and CVs at various scan rate. The experimental results from present work is useful for opening new insight into the contrivance and creation of applicable sodium polyanionic cathode materials for high-performance.

关键词: Sodium ion battery, Na₂FeP₂O₇/C, B-doping, Solid phase method

Abstract: In recent years, the composite materials based on polyanionic frameworks as secondary sodium ion battery electrode material have been developed in large-scale energy storage applications due to its safety and stability. The Na₂FeP₂O₇/C (theoretical capacity 97 mA·h·g^-1) is recognized as optimum Na-storage cathode materials with a trade-off between electrode performance and cost. In the present work, The Na₂FeP₂O₇/C and boron-doped Na₂FeP_2-BO₇/C composites were synthesized via a novel method of liquid phase combined with high temperature solid phase. The non-metallic element B doping not only had positive influence on the crystal structure stability, Na⁺ diffusion and electrical conductivity of Na₂FeP₂O₇/C, but also contributed to the high-value recycling of B element in waste borax. The structure and electrochemical properties of the cathode material were investigated via X-ray diffraction (XRD), scanning electron microscopy (SEM), The X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and charge/discharge cycling. The results showed that different amounts of boron doping had positive effects on the structure and electrochemical properties of the material. The initial charge/discharge performances of born doped materials were improved in comparison to the bare Na₂FeP₂O₇/C. The cycle performance of the Na₂FeP_1.95B_0.05O₇/C showed an initial reversible capacity of 74.8 mA·h·g^-1 and the high capacity retention of 91.8% after 100 cycles at 1.0 C, while the initial reversible capacity of the bare Na₂FeP₂O₇/C was only 66.2 mA·h·g^-1. The improvement of apparent Na⁺ diffusion and electrical conductivity due to B doping were verified by the EIS test and CVs at various scan rate. The experimental results from present work is useful for opening new insight into the contrivance and creation of applicable sodium polyanionic cathode materials for high-performance.

Key words: Sodium ion battery, Na₂FeP₂O₇/C, B-doping, Solid phase method

He Zhao, Jianzhong Li, Haoyuan Xu, Xuanwen Gao, Junjie Shi, Kai Yu, Xueyong Ding. Effective enhancement of the electrochemical properties for Na₂FeP₂O₇/C cathode materials by boron doping[J]. 中国化学工程学报, 2021, 39(11): 277-285.

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Effective enhancement of the electrochemical properties for Na₂FeP₂O₇/C cathode materials by boron doping

Effective enhancement of the electrochemical properties for Na₂FeP₂O₇/C cathode materials by boron doping

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