Anchoring SnS2 on TiC/C Backbone to Promote Sodium Ion Storage by Phosphate Ion Doping. Issue 40 (6th September 2020)

• Record Type: Journal Article
• Authors: Shen, Yanbin; Deng, Shengjue; Liu, Ping; Zhang, Yan; Li, Yahao; Tong, Xili; Shen, Hong; Liu, Qi; Pan, Guoxiang; Zhang, Lingjie; Wang, Xiuli; Xia, Xinhui; Tu, Jiangping
• Is Part Of: Small. Volume 16:Issue 40(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-09-06
• Subjects: anodes -- arrays -- phosphate ion doping -- sodium ion batteries -- tin disulfide; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202004072
• Languages: English
• ISSNs: 1613-6810

Abstract

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 (PO4 3− )‐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 PO4 3− 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 PO4 3− 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 PO4 3− 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. Abstract : High‐quality phosphate ion (PO4 3− )‐doped SnS2 @TiC/C (P‐SnS2 @TiC/C) arrays are prepared via a hydrothermal‐chemical vapor deposition method and show positive synergistic effect with short transport paths for ions/electrons, improved electronic conductivity and enlarged interlayer spacing, demonstrated by DFT calculations and characterization methods, and consequently result in favorable intercalation/deintercalation of Na + and accelerated reaction kinetics.