Microsized Gray Tin as a High-Rate and Long-Life Anode Material for Advanced Sodium-Ion Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 36174039.
- Also identified by DOI 10.1021/acs.nanolett.2c03334.
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Abstract
Sodium-ion batteries (SIBs) are developed to address the serious concern about the limited resources of lithium. To achieve high energy density, anode materials with a large specific capacity and a low operation voltage are highly desirable. Herein, microsized particles of gray Sn (α-Sn) are explored as an anode material of SIBs for the first time. The distinct structure of α-Sn endows it the reduced volume change, the improved interaction with polymer binders and the <i>in situ</i> formation of amorphous Sn, as supported by <i>in situ</i> XRD, TEM and DFT calculations. Therefore, α-Sn exhibits an excellent electrochemical performance, much better than β-Sn widely used before. Even microsized particles of α-Sn without any treatments deliver a capacity of ∼451 mAh g<sup>-1</sup> after 3500 cycles at 2 A g<sup>-1</sup> or ∼464 mAh g<sup>-1</sup> at 4 A g<sup>-1</sup> in a rate test. The results indicate the promising potential of α-Sn in SIBs.