Preparation of Cu7.2S4@N, S co-doped carbon honeycomb-like composite structure for high-rate and high-stability sodium-ion storage

• Published in: Journal of colloid and interface science Vol. 648; pp. 527 - 534
• Main Authors: Peng, Chao, Yue, Lijuan, Cui, Yu, He, Xiangfei, Xu, Shoudong, Guo, Chunli, Guo, Meiqing, Chen, Han
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 15.10.2023
• Subjects: Anode material; Sodium ion battery; Transition metal sulfide; Anode material; Sodium ion battery; Transition metal sulfide
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2023.05.096

[Display omitted] Sodium ion batteries (SIBs) attract most of the attention as alterative secondary battery systems for future large-scale energy storage and power batteries due to abundance resource and low cost. However, the lack of anode materials with high-rate performance and high cycling-stability has limited the commercial application of SIBs. In this paper, Cu7.2S4@N, S co-doped carbon (Cu7.2S4@NSC) honeycomb-like composite structure was designed and prepared by a one-step high-temperature chemical blowing process. As an anode material for SIBs, Cu7.2S4@NSC electrode exhibited an ultra-high initial Coulomb efficiency (94.9%) and an excellent electrochemical property including a high reversible capacity of 441.3 mAh g−1 after 100 cycles at 0.2 A g−1, an excellent rate performance of 380.4 mAh g−1 even at 5 A g−1, and a superior long-cycle stability with a capacity retention rate of approximately 100% after 700 cycles at 1A g−1.