Atomic Welded Dual-Wall Hollow Nanospheres for Three-in-One Hybrid Storage Mechanism of Alkali Metal Ion Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 34328313.
- Also identified by DOI 10.1021/acsnano.1c04913.
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Abstract
The rational design of hierarchical hollow nanomaterials is of critical significance in energy storage materials. Herein, dual-wall hollow nanospheres (DWHNS) Sn/MoS<sub>2</sub>@C are constructed by <i>in situ</i> confined growth and interface engineering. The inner hollow spheres of Sn/MoS<sub>2</sub> are formed by atomic soldering MoS<sub>2</sub> nanosheets with liquid Sn at high temperature. The formation mechanism of the hierarchical structure is explored by the morphology evolutions at different temperatures. The DWHNS Sn/MoS<sub>2</sub>@C manifest abundant inner space and high specific surface area, which provides more support sites for Li<sup>+</sup>/Na<sup>+</sup>/K<sup>+</sup> storage and alleviates the volume effect of tin-based electrode materials to a certain extent. The composite material manifests an outstanding specific capacity and satisfactory reversibility of lithium ion batteries (∼931 mAh g<sup>-1</sup> at 1 A g<sup>-1</sup> after 500 cycles), sodium ion batteries (∼432 mAh g<sup>-1</sup> at 1 A g<sup>-1</sup> after 400 cycles), and potassium ion batteries (∼226 mAh g<sup>-1</sup> at 1 A g<sup>-1</sup> after 300 cycles). Additionally, the morphology evolution and mechanism analysis of DWHNS Sn/MoS<sub>2</sub>@C in alkali metal ion batteries are verified by <i>ex situ</i> measurement, which confirms the three-in-one hybrid storage mechanism, <i>i.e</i>., intercalation reaction of carbon shells, conversion reaction of MoS<sub>2</sub>, and alloying reaction of tin.