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Synergistic Engineering of Defects and Heterostructures Enhance Lithium/Sodium Storage Properties of F‐SnO 2‐x ‐SnS 2‐x Nanocrystals Supported on N,S‐Graphene
Author(s) -
Yuan Xing,
Zhao Xiaojun,
Qiu Shuting,
Song Yizhuo
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202101561
Subject(s) - materials science , anode , heterojunction , graphene , chemical engineering , lithium (medication) , doping , electrolyte , oxide , nanocomposite , heteroatom , nanocrystal , conductivity , electrode , nanotechnology , chemistry , optoelectronics , metallurgy , medicine , ring (chemistry) , organic chemistry , endocrinology , engineering
Phase engineering of the electrode materials in terms of designing heterostructures, introducing heteroatom and defects, improves great prospects in accelerating the charge storage kinetics during the repeated Li + /Na + insertion/deintercalation. Herein, a new design of Li/Na‐ion battery anodes through phase regulating is reported consisting of F‐doped SnO 2 ‐SnS 2 heterostructure nanocrystals with oxygen/sulfur vacancies (V O /V S ) anchored on a 2D sulfur/nitrogen‐doped reduced graphene oxide matrix (F‐SnO 2‐x ‐SnS 2‐x @N/S‐RGO). Consequently, the F‐SnO 2‐x ‐SnS 2‐x @N/S‐RGO anode demonstrates superb high reversible capacity and long‐term cycling stability. Moreover, it exhibits excellent great rate capability with 589 mAh g −1 for Li + and 296 mAh g −1 at 5 A g −1 for Na + . The enhanced Li/Na storage properties of the nanocomposites are not only attributed to the increase in conductivity caused by V O /V S and F doping (confirmed by DFT calculations) to accelerate their charge‐transfer kinetics but also the increased interaction between F‐SnO 2‐x ‐SnS 2‐x and Li/Na through heterostructure. Meanwhile, the hierarchical F‐SnO 2‐x ‐SnS 2‐x @N/S‐RGO network structure enables fast infiltration of electrolyte and improves electron/ion transportation in the electrode, and the corrosion resistance of F doping contributes to prolonged cycle stability.