A pinning structure via composing laminar rGO with fragmented MoS2 toward fast and stable sodium and lithium-ion storage

• Published in: Journal of alloys and compounds Vol. 968; p. 172028
• Main Authors: Liu, Rui, Zeng, Huanzhong, Peng, Yuanyou, Wang, Yumeng, Ran, Fen
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.12.2023
• Subjects: Anode materials; Diffusion kinetics; Fast-charging; Lithium-ion batteries; Sodium-ion batteries; Lithium-ion batteries; Diffusion kinetics; Fast-charging; Sodium-ion batteries; Anode materials
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2023.172028

The diffusion of lithium ions and sodium ions in the anode materials is the main factor limiting the fast-charging performance of lithium and sodium-ion batteries. Due to the slow diffusion kinetics, taking lithium-ion batteries as an example, lithium ions and electrons accumulate locally in and on the surface of anode materials, especially in the process of fast-charging, resulting in uneven lithiation reaction and enormous transient stress, which leads to poor fast-charging performance. In this work, from the aspect of solving the ion diffusion rate, a capacitive type of energy storage is introduced by designing MoS2/rGO composite materials with pinned structures as fast-charging and stable anode materials for lithium-ion batteries and sodium-ion batteries. Combining the high ion conductivity and structural rigidity of the rGO conductive network with a few-layer MoS2 provides a high ion diffusion rate and capacity. As expected, it can charge to 69 % in 25 min and 44 % in 3.2 min, respectively, providing a high capacity of 214.2 mAh g−1 at 10 A g−1 and a high-capacity retention of 85.31 % after 1, 000 cycles at the current density of 3 A g−1 in sodium-ion batteries. Similarly, the high reversible capacity of 910.5 mAh g−1 is achieved in the lithium-ion batteries, and there is almost no capacity loss after 1, 000 cycles at a high current density of 2 A g−1. This work may provide a reference for designing more fast-charging anode materials with high capacity. [Display omitted] •A stable structure in which MoS2 with an interlayer spacing of 6.75 Å is uniformly dispersed on graphene.•By amino modification of MoS2 stripped by lithium ion intercalation and the action of oxygen-containing functional groups of graphene.•MoS2/rGO composite materials can charge to 69 % in 25 min and 44 % in 3.2 min.•A high fast-charging capacity of 214 mAh g−1 at 10 A g−1 in SIBs, and 910 mAh g−1 in LIBs.