Multi-heterostructured SnO2/SnSx embedded in carbon framework for high-performance sodium-ion storage
2022
Bian, Haidong | Li, Zebiao | Pan, Jie | Liao, Wenchao | Li, Zhangjian | Zhou, Binbin | Zhang, Zheming | Wu, Junwei | Liu, Chen
Heterostructure materials, as newborn electrode materials for rechargeable batteries, are attracting increasing attention due to their robust architectures and superior electrochemical performances. It is widely believed that the inner electric field induced at the interface can improve the electric conductivity and ion diffusion kinetics, thus enhancing the long-term stability and high-rate performance of the batteries. Although much progress is made on heterostructure construction, the performance of the batteries is still far from satisfying the commercial applications. In this work, a new type of SnO₂/SnSₓ (x = 1, 1.5) heterostructure embedded in carbon framework (C@SnO₂/SnSₓ) is constructed via a facile sulfidation process. Compared to a single heterojunction, the multi-heterojunctions generated at SnO₂/SnSₓ interface can induce an intensified built-in electric field, which promotes charge transportation and reaction kinetics of the electrode for Na-ions storage. Upon the sodiation process, the induced intensified electric field drives Na ions from Sn₂S₃ or SnO₂ to SnS, while an inverse transportation of Na ions are accelerated upon the desodation process. As a result, C@SnO₂/SnSₓ exhibits an outstanding reversible capacity of 510 mA h g⁻¹ after 300 cycles at 200 mA g⁻¹.
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