Anchoring SnS₂ on TiC/C Backbone to Promote Sodium Ion Storage by Phosphate Ion Doping

Abstract

Tin disulfide (SnS2) shows promising properties toward sodium ion storage with high capacity, but its cycle life and high rate capability are still undermined as a result of poor reaction kinetics and unstable structure. In this work, phosphate ion (PO43−)‐doped SnS2 (P‐SnS2) nanoflake arrays on conductive TiC/C backbone are reported to form high‐quality P‐SnS2@TiC/C arrays via a hydrothermal–chemical vapor deposition method. By virtue of the synergistic effect between PO43− doping and conductive network of TiC/C arrays, enhanced electronic conductivity and enlarged interlayer spacing are realized in the designed P‐SnS2@TiC/C arrays. Moreover, the introduced PO43− can result in favorable intercalation/deintercalation of Na+ and accelerate electrochemical reaction kinetics. Notably, lower bandgap and enhanced electronic conductivity owing to the introduction of PO43− are demonstrated by density function theory calculations and UV–visible absorption spectra. In view of these positive factors above, the P‐SnS2@TiC/C electrode delivers a high capacity of 1293.5 mAh g−1 at 0.1 A g−1 and exhibits good rate capability (476.7 mAh g−1 at 5 A g−1), much better than the SnS2@TiC/C counterpart. This work may trigger new enthusiasm on construction of advanced metal sulfide electrodes for application in rechargeable alkali ion batteries.

Iron Nitride@C Nanocubes Inside Core–Shell Fibers to Realize High Air-Stability, Ultralong Life, and Superior Lithium/Sodium Storages

“…Lithium-ion batteries (LIBs) have been commercialized in portable devices in the past decades. , However, the rare resource as well as the high price of lithium greatly restricts their applications. As alternatives, a variety of metal-ion batteries (MIBs) including the monovalent ion, − for example, Na + and K + , and multivalent ion, − for example, Zn 2+ , Mg 2+ , and Al 3+ , batteries have been explored as cathodes for MIBs. Among them, the sodium-ion battery (SIB) turns to be the most promising one.…”

Conversion‐Alloying Anode Materials for Sodium Ion Batteries

“…The prepared P-SnS 2 @TiC/C arrays displayed a tubular morphology with average diameter of 500 nm (Figure 5c). [111] Moreover, Hou et al synthesized Sb 2 S 3 and Sb 2 S 3 @C with the rod morphology employing a typical solvothermal strategy. The Sb-thiourea composite was generated at the initial stage, following the progressive release of S 2− and Sb 3+ due to the decomposition of thiourea, leading to the formation of Sb 2 S 3 particles.…”

“…The prepared P‐SnS 2 @TiC/C arrays displayed a tubular morphology with average diameter of 500 nm (Figure 5c). [ 111 ] Moreover, Hou et al. synthesized Sb 2 S 3 and Sb 2 S 3 @C with the rod morphology employing a typical solvothermal strategy.…”

“…Reproduced with permission. [ 111 ] Copyright 2020, Wiley‐VCH. d) Formation mechanism of the SnSe nanoplates from the droplet containing tin oxalate and H 2 SeO 3 .…”

Tailoring the Void Space Using Nanoreactors on Carbon Fibers to Confine SnS2 Nanosheets for Ultrastable Lithium/Sodium‐Ion Batteries

“…[10][11][12][13] However, the insufferable poor electrical conductivity and the large volume expansion of SnS 2 during the electrochemical reactions lead to the enormous capacity loss and deteriorative stability, thus hindering its further practical application.To address these challenges, the strategies for improving the electrochemical performance of SnS 2 include: i) designing various nanostructured materials to shorten the electron and ion diffusion distance, such as ultrafine nanosheets with high active (001) and (100) facets and porous structures; [14][15][16] ii) compositing with carbonaceous materials as the supporting matrix to improve the conductivity and structure stability, such as carbon fiber, graphene, etc. ; [17][18][19][20] iii) constructing hollow nanostructures with void space to accommodate huge volume changes. [21][22][23] Among these methods, yolk-shell nanostructures confining SnS 2 by carbonaceous matrix have been demonstrated as an attractive choice to accommodate the volume expansion and enhance kinetics of SnS 2 .…”