Three-Dimensional Sn@Ti 3C 2 Superstructure in Layer-by-Layer Through Self-Assembly for High-Performance Lithium-Ion Storage
26 Pages Posted: 30 Oct 2019
Date Written: October 23, 2019
Powerful yet orderly nanostructure lithium-ion batteries (LIBs) are eagerly desired to satisfy the practical application of portable electronics and smart grids. However, the re-stacking and surface functionalization attached on the MXenes surface in the anode electrode severely restrict the accessibility to electrolyte ions, hindering the full utilization of their intrinsic properties. To address this challenge, the Sn@Ti3C2 materials of three dimensional (3D) are rationally designed and fabricated in unique layer-by-layer manner through self-assembly for boosting LIBs. In this design system for fast lithium-ion storage, the Ti3C2 MXene nanosheets serving as 3D scaffolds buffer Sn nanoparticles' severe volume expansion, agglomeration and enhance electrode conductivity at the interface. Furthermore, Sn nanoparticles are embedded as interlayer spacers to prevent the re-stacking of nanosheets and provide outstanding electrochemical performance. The nanostructure can increase the lithium-ion diffusion coefficient and create additional active sites. As a result, the Sn@Ti3C2 anode exhibits a superior specific capacity of up to 577 mA h g-1 at 0.5 A g-1 after 100 cycles. Comparing with pure Sn, the improved electrochemical performance of Sn@Ti3C2 can be ascribed to the high electronic conductivity of Ti3C2 MXene nanosheets. The present 3D Sn@Ti3C2 materials in layer-by-layer self-assembly perform their promising for LIBs.
Keywords: Layer-by-layer assembly, Ti3C2 MXene, 3D scaffolds, Sn anodes, lithium-ion batteries
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