Large-scale synthesis of ultrafine Fe3C nanoparticles embedded in mesoporous carbon nanosheets for high-rate lithium storage

• Published in: RSC advances Vol. 12; no. 11; pp. 6508 - 6514
• Main Authors: Yu, Ying, Wang, Xuanli, Zhang, Hongkun, Cao, Zhiqin, Wu, Haoyang, Jia, Baorui, Yang, Jun Jun, Qu, Xuanhui, Qin, Mingli
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 22.02.2022; The Royal Society of Chemistry
• Subjects: Anodes; Carbon; Cementite; Chemistry; Combustion synthesis; Crystallization; Current density; Discharge; Electrical resistivity; Electrode materials; Iron carbides; Lithium; Lithium-ion batteries; Nanoparticles; Nanosheets; Rechargeable batteries; Size distribution; Storage batteries; Ultrafines
• ISSN: 2046-2069
• DOI: 10.1039/d1ra08516f

Fe3C modified by the incorporation of carbon materials offers excellent electrical conductivity and interfacial lithium storage, making it attractive as an anode material in lithium-ion batteries. In this work, we describe a time- and energy-saving approach for the large-scale preparation of Fe3C nanoparticles embedded in mesoporous carbon nanosheets (Fe3C-NPs@MCNSs) by solution combustion synthesis and subsequent carbothermal reduction. Fe3C nanoparticles with a diameter of ∼5 nm were highly crystallized and compactly dispersed in mesoporous carbon nanosheets with a pore-size distribution of 3–5 nm. Fe3C-NPs@MCNSs exhibited remarkable high-rate lithium storage performance with discharge specific capacities of 731, 647, 481, 402 and 363 mA h g−1 at current densities of 0.1, 1, 2, 5 and 10 A g−1, respectively, and when the current density reduced back to 0.1 A g−1 after 45 cycles, the discharge specific capacity could perfectly recover to 737 mA h g−1 without any loss. The unique structure could promote electron and Li-ion transfer, create highly accessible multi-channel reaction sites and buffer volume variation for enhanced cycling and good high-rate lithium storage performance.