Engineering of Ni3S4/Co3S4 nanosheets@N, S co-doped carbon anode for lithium-ion batteries

• Published in: Ionics Vol. 27; no. 12; pp. 5089 - 5096
• Main Authors: Xu, Kairui, Ren, Yongqiang, Zhang, Bei, Xu, Xiaolong, Ding, Ping, Jiang, Yue, Gong, Qinghua, Sun, Xuefeng, Zhou, Guowei
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-12-2021; Springer Nature B.V
• Subjects: Anodes; Carbon; Chemistry; Chemistry and Materials Science; Cobalt sulfide; Condensed Matter Physics; Electrochemical analysis; Electrochemistry; Electronic structure; Energy Storage; Heterostructures; Ion transport; Lithium; Lithium-ion batteries; Metal sulfides; Nanosheets; Optical and Electronic Materials; Original Paper; Rechargeable batteries; Renewable and Green Energy; Storage batteries; Transition metals; Heterostructure; Lithium-ion batteries; N, S co-doped carbon; Mesoporous; Glass state
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-021-04270-z

Developing lithium-ion batteries (LIBs) with high electrochemical performance to meet the energy storage requirements has become a research hotspot. Transition metal sulfides (TMSs) have drawn much attention because of their long cycle life and significantly specific capacity. Herein, we synthesize the Ni
3
S
4
/Co
3
S
4
nanosheets@N, S co-doped carbon (Ni
3
S
4
/Co
3
S
4
@NSC) composites by hydrothermal technology. Such nanosheets constituted by heterostructure and glass state of Ni
3
S
4
and Co
3
S
4
are beneficial to lithium-ion transport, and N, S co-doping improves electronic structure for the enhancement of electronic conductivity. Its synergetic effect delivers a high specific capacity of 1619.1 mA h g
−1
at a current density of 100 mA g
−1
with a stable coulombic efficiency of ∼97%. Unique 120° angle formed by assembling nanosheets on the surface of mesoporous carbon facilitates a good cycle stability (a capacity retention ratio of ∼74.3% over 100 cycles). This work provides a new strategy to regulate performance of LIB anodes.