Journal
ELECTROCHIMICA ACTA
Volume 369, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.137657
Keywords
SnP2O7; Doped graphene; Sodium-ion batteries; Dual-ion batteries
Categories
Funding
- National Natural Science Foundation of China [21965025]
- Education Department of Jilin Province [JJKH20200759KJ]
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In this study, SnP2O7 particles are encapsulated into N/P dual-doped graphene to fabricate SnP2O7/NPG, which shows remarkable cycling performance and rate capability as a universal anode material for both SIBs and SDIBs. The unique structure of tin-based ternary oxides and synergy effect of multicomponent contribute to the excellent electrochemical performance observed in this work, providing inspiration for wider application prospects in energy storage systems.
Tin-based ternary oxides have obtained much attention for energy storage systems due to high capacity based on alloying/dealloying reactions and improved cycling performance resulted from the inactive buffer matrix. Herein, SnP2O7 particles are encapsulated into N/P dual-doped graphene (SnP2O7/NPG), which is served as an universal anode material for sodium-ion batteries (SIBs) and sodium-based dual-ion batteries (SDIBs). Benefiting from the unique structure of tin-based ternary oxides and synergy effect of multicomponent, the obtained SnP2O7/NPG delivers a good reversible capacity of 412.9 mAh g(-1) at 0.05 A g(-1), superior cycling performance of 86.2 mAh g(-1) at 2 A g(-1) after 100 0 cycles, and exceptional rate performance of 182.3 mAh g(-1) at 2 A g(-1) in Na+ half cells. Especially, assembly of SnP2O7/NPG with the graphite cathode could yield a SnP2O7/NPG-graphite SDIBs, which shows high rate performance (up to 2 A g(-1)) and good cycling stability over 100 cycles with a capacity retention of 63.2%. Furthermore, the Na+ insertion/extraction mechanism is systematically investigated using the extensive kinetics investigation. This work provides inspirations as to extending the wider application prospect of tin-based ternary oxides in energy storage systems. (C) 2020 Elsevier Ltd. All rights reserved.
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