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Anchoring SnS 2 on TiC/C Backbone to Promote Sodium Ion Storage by Phosphate Ion Doping
Author(s) -
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
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202004072
Subject(s) - materials science , doping , sulfide , conductivity , alkali metal , tin , electrochemistry , ion , electrode , chemical engineering , inorganic chemistry , optoelectronics , chemistry , organic chemistry , engineering , metallurgy
Tin disulfide (SnS 2 ) 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 (PO 4 3− )‐doped SnS 2 (P‐SnS 2 ) nanoflake arrays on conductive TiC/C backbone are reported to form high‐quality P‐SnS 2 @TiC/C arrays via a hydrothermal–chemical vapor deposition method. By virtue of the synergistic effect between PO 4 3− doping and conductive network of TiC/C arrays, enhanced electronic conductivity and enlarged interlayer spacing are realized in the designed P‐SnS 2 @TiC/C arrays. Moreover, the introduced PO 4 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 PO 4 3− are demonstrated by density function theory calculations and UV–visible absorption spectra. In view of these positive factors above, the P‐SnS 2 @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 SnS 2 @TiC/C counterpart. This work may trigger new enthusiasm on construction of advanced metal sulfide electrodes for application in rechargeable alkali ion batteries.