Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 930, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.167328
Keywords
Rational design; Yolk-shell nanostructure; SnxPy; NG; Cycling stability; Lithium; Sodium storage
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The rational design of yolk-shell nanostructured tin phosphide composites (SnxPy/NG) achieved high-rate and long-term cycling stability in lithium and sodium half cells. The unique structure relieved volume expansion and promoted reaction kinetics, resulting in superior energy storage performance compared to nanoclusters or nanoparticles.
The rational design of nanostructure is crucial to achieving high-rate and long-term cycling performance for electrodes. Herein, the tin phosphide composites with yolk-shell nanostructure (SnxPy/NG) are designed and synthesized by one-step carbonization and phosphorization from the precursor of Sn6O4(OH)4/NG. The SnxPy/NG electrode with yolk-shell nanostructure shows energy storage properties superior to that of nanoclusters or nanoparticles. The void space in yolk-shell nanostructure relieves the huge volume ex-pansion, and the unique phase hybridization of Sn4P3 and SnP0.94 promotes the reaction kinetics. Thus, SnxPy/NG delivers high-rate long-term cycling stability for Li-half cells (521.2 mA h g-1 maintained after 3000 cycles at 5.0 A g-1) and Na-half cells (203.1 mA h g-1 maintained after 300 cycles at 1.0 A g-1). The design strategy can promote the practical application of Sn-based phosphide and pave the way for designing and exploring other metal-based phosphide electrodes for energy storage.(c) 2022 Published by Elsevier B.V.
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