Efficient Stress Dissipation in Well‐Aligned Pyramidal SbSn Alloy Nanoarrays for Robust Sodium Storage

Abstract

Alloy‐type anode materials are promising for sodium‐ion batteries owing to their high theoretical specific capacity. However, their practical application is limited by the rapid capacity decay resulted from drastic volume change upon sodium (Na) alloying/dealloying. Here, a facile fabrication of well‐aligned antimony tin (SbSn) alloy nanoarrays electrodeposited on copper (Cu) substrates is reported. Such a binary alloy possesses well‐defined triangular pyramid‐like structure, and the subsequent thermal annealing process develops an “alloy glue” at the root of the nanoarrays which generates a strong connection between the active alloy and the copper substrate. Density functional theory calculation results suggest that the as‐fabricated alloy offers an energetically favorable Na diffusion as compared to the individual metals, and the “alloy glue” provides a strong interaction between the substrate and SbSn. More importantly, based on finite‐element analysis, such a unique construction of the triangular pyramid‐like nanostructure not only creates a small difference in the Na+ concentration gradient, but also builds a uniform stress distribution that promotes both highly efficient Na+ diffusion and effective stress dissipation. Collectively, the optimized composition and geometry give rise to the enhanced high‐rate performance and prolonged cycle life of the current SbSn alloy nanoarrays.

Tailoring the Boron Configurations in B‐doped Na3V2(PO4)3@Carbon for Fast and Durable Sodium Storage

“…Both samples showed distinct oxidation and reduction peaks at different scan rates, while smaller polarization was calculated for sample III (Figure S10), suggesting better kinetic properties of sample III than sample I. The detailed storage behavior could be further calculated by following Equation ( 1): [52][53][54][55] log ðiÞ ¼ b log ðvÞ þ log ðaÞ…”

Dual Regulation of Metal Doping and Adjusting Cut‐Off Voltage for MoSe2 to Achieve Reversible Sodium Storage

“…Till now, a great deal of electrode materials including carbonaceous materials, [10][11][12] metal oxides/sulfides/selenides, [13][14][15][16] and alloys [17][18][19] has been extensively explored and employed as anodes for SIBs. 2D transition metal selenides, as a promising anode candidate for SIBs, have received enormous concern on account of prominent superiority in aspect of unique layered structure and favorable physicochemical properties.…”

Bean Pod‐Like SbSn/N‐Doped Carbon Fibers toward a Binder Free, Free‐Standing, and High‐Performance Anode for Sodium‐Ion Batteries

“…Noted that at this state, the HRTEM images (Figure S14b,c, Supporting Information) only revealed the lattice space of 0.31 nm, which contributed to (101) crystal plane of the SbSn phase. [61] Further, it was shown that the Na 3 Sb and Na 3.75 Sn phases came through dealloying reaction to convert to primitive SbSn phase after desodiation. After desodiation, the TEM-EDS mapping images (Figure S13d-j, Supporting Information) showed the elements distributed uniformly, indicating the extraction of Na + .…”