Ultra small few layer MoS2 embedded into three-dimensional macro-micro-mesoporous carbon as a high performance lithium ion batteries anode with superior lithium storage capacity

• Published in: Electrochimica acta 2019-09, Vol.317, p.638-647
• Main Authors: Huang, Moujie, Chen, Huanhui, He, Jiao, An, Bohan, Sun, Lingna, Li, Yongliang, Ren, Xiangzhong, Deng, Libo, Zhang, Peixin
• Format: Article
• Language: English
• Subjects: Abundant active sites; Anode materials; Anodes; Carbon; Charge transport; Current density; Electrode materials; Electrodes; Lithium; Lithium-ion batteries; Low conductivity; Macro-micro-mesoporous carbon; Molybdenum disulfide; Nanostructure; Phase transitions; Reaction kinetics; Rechargeable batteries; Self-assembly; Storage batteries; Storage capacity; Structural stability; Ultra small few layer MoS2; Ultrafast ion transport
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2019.06.025

Molybdenum disulfide (MoS2) exhibits additional reversible capacity beyond their theoretical value is promising candidates for electrodes of lithium ion batteries (LIBs). However, the sluggish kinetics, low conductivity and self-aggregating of MoS2 nanosheets hinder the practical application. Herein, ultra small few layer MoS2 combined with carbon hybrids of macro-micro-mesoporous structure (MoS2/MmC) is prepared via a simple and scalable liquid-solid-gas three-phase interface self-assembly process. When employed as anode for lithium ion batteries, such a clever structure possesses superior performance: exhibits discharge capacity of 938 mAh g−1 at current density of 200 mA g−1 following 100 cycles, and reveals reversible capacity of 843 mAh g−1 at current density of 2 A g−1 after 1000 cycles. The excellent performance is attributed to the rational design of electrode structure: ultra small few layer MoS2 nanosheets offer abundant active sites, while the 3D porous architectures are in favor of enhancing the mass-transportation and alleviating the volume expansion. These structural features greatly enhance surface reaction kinetics and facilitate the charge transport. Furthermore, Ex-situ XRD, FESEM are used to confirm the phase transformation of MoS2/MmC and verify the structure stability during the cycling. It is believed that our work opens up a new possible route for the industrial production of MoS2 based anode materials. Ultra small few layer MoS2 combined with carbon hybrids of macro-micro-mesoporous structure (MoS2/MmC) is prepared via a simple and scalable liquid-solid-gas three-phase interface self-assembly process. When employed as anode for lithium ion batteries, such a clever structure possesses superior performance: exhibits discharge capacity of 938 mAh g-1 at current density of 200 mA g-1 following 100 cycles, and reveals reversible capacity of 843 mAh g-1 at current density of 2 A g-1 after 1000 cycles. [Display omitted] •Ultra small few layer MoS2 had been synthesized by a simple and scalable method.•Abundant active sites of MoS2/MmC derived from rich edges can enhance lithium storage capacity.•The feature of MoS2/MmC combine with MoS2 nanosheets and macro-micro-mesoporous carbon boosting the LIBs performance.•Ex-situ XRD was used to explore the essence of the excellent electrochemical properties.•We conceived the structural transformation mechanism of MoS2/MmC.