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High yield electrochemical exfoliation synthesis of tin selenide quantum dots for high-performance lithium-ion batteries

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Abstract

Tin selenide (SnSe) nanostructures hold great promise as an anode material in lithium-ion batteries (LIBs) due to their high storage capacity, rapid lithiation kinetics and long-term cycling stability. However, a scalable synthesis of SnSe nanostructures with a well-defined size remains a challenge in chemistry. Here, we report cathodic exfoliation of a bulk SnSe crystal for a high-yield (>90%) synthesis of sub-5 nm scale SnSe quantum dots (QDs). As-exfoliated SnSe QDs demonstrate a superior performance as the anode material for LIBs. Our results reveal that SnSe QDs not only accommodate the volume expansion/contraction during the reversible charging/discharging in LIBs but also increase the effective contact interface area between the nanostructured anode materials and electrolyte, leading to a high charging/discharging rate and superior cycling performance. Additionally, SnSe QD based LIBs exhibit a reversible capacity retention of 550 mA h gāˆ’1 and high coulombic efficiency approaching 100% after 1500 charging/discharging cycles at a current density of 0.5 A gāˆ’1.

Graphical abstract: High yield electrochemical exfoliation synthesis of tin selenide quantum dots for high-performance lithium-ion batteries

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Publication details

The article was received on 04 May 2019, accepted on 05 Jul 2019 and first published on 05 Jul 2019


Article type: Paper
DOI: 10.1039/C9TA04643G
J. Mater. Chem. A, 2019, Advance Article

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    High yield electrochemical exfoliation synthesis of tin selenide quantum dots for high-performance lithium-ion batteries

    J. Li, W. Liu, C. Chen, X. Zhao, Z. Qiu, H. Xu, F. Sheng, Q. Hu, Y. Zheng, M. Lin, S. J. Pennycook, C. Su and J. Lu, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA04643G

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