High capacity and fast Na+ transport in the SbPS4 material by Bi3+ substitution for sodium-ion batteries

• Published in: Inorganic chemistry frontiers Vol. 9; no. 24; pp. 6369 - 6378
• Main Authors: Qi-Min, Yin, Zhen-Yi Gu, Hong-Yan Lü, Guo, Weiping, Du, Miao, Yi-Tong, Liu, Liu, Yan, Yong-Li, Heng, Zhong-Zhen Luo, Xing-Long, Wu
• Format: Journal Article
• Language: English
• Published: London Royal Society of Chemistry 06.12.2022
• Subjects: Electrochemical analysis; Inorganic chemistry; Materials substitution; Sodium; Sodium-ion batteries
• ISSN: 2052-1545; 2052-1553
• DOI: 10.1039/d2qi01899c

The SbPS4 material has become a research hotspot in sodium ion battery anode due to its high specific capacity. Herein, we propose an effective strategy of Bi3+ substitution in SbPS4 to improve the electrochemical performance during long-term charge and discharge processes. Compared with the specific capacity of 574 mA h g−1 of SbPS4, the Sb0.7Bi0.3PS4 material delivers a higher value of 831 mA h g−1 at 0.1 A g−1, which is a 30.9% improvement. The improvement in the electrochemical performance was attributed to the introduction of Bi active element, which can reduce large volume changes and enhance the ion and electron conductivities of SbPS4. In addition, we have proved that pseudo-capacitance control in kinetic behaviors is instrumental for fast Na+ transport in Sb0.7Bi0.3PS4 (92.1% of the total capacity comes from the capacitive contribution at 1.0 mV s−1). Moreover, the full battery exhibited excellent rate performance (122.9 mA h g−1 at 0.1C and 102.7 mA h g−1 at 1C) when paired by a Sb0.7Bi0.3PS4 anode and a Na3V2(PO4)2O2F cathode.