Abstract
SnO2 is considered to be a promising candidate as anode material for lithium ion batteries, due to its high theoretical specific capacity (1494 mAh·g−1). Nevertheless, SnO2-based anodes suffer from poor electronic conductivity and serious volume variation (300%) during lithiation/delithiation process, leading to fast capacity fading. To solve these problems, SnO2 quantum dots modified N-doped carbon spheres (SnO2 QDs@N–C) are fabricated by facile hydrolysis process of SnCl2, accompanied with the polymerization of polypyrrole (PPy), followed by a calcination method. When used as anodes for lithium ion batteries, SnO2 QDs@N–C exhibits high discharge capacity, superior rate properties as well as good cyclability. The carbon matrix completely encapsulates the SnO2 quantum dots, preventing the aggregation and volume change during cycling. Furthermore, the high N content produces abundant defects in carbon matrix. It is worth noting that SnO2 QDs@N–C shows excellent capacitive contribution properties, which may be due to the ultra-small size of SnO2 and high conductivity of the carbon matrix.
Graphic abstract
SnO2 quantum dots modified N-doped carbon spheres are successfully fabricated by facile hydrolysis-high temperature calcination approach using SnCl2 and pyrrole monomer as precursors. As anodes for lithium ion batteries, the SnO2 QDs@N-C-600 exhibits superior rate capability and excellent cycling stability. This work provides an effective way to obtain electrode materials with high specific capacity and good cycling performance for energy storage
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Nos. 51702138 and 21817056), the Natural Science Foundation of Jiangsu Province (Nos .BK20160213 and BK20170239) and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. KYCX20-2358).
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Wu, CP., Xie, KX., He, JP. et al. SnO2 quantum dots modified N-doped carbon as high-performance anode for lithium ion batteries by enhanced pseudocapacitance. Rare Met. 40, 48–56 (2021). https://doi.org/10.1007/s12598-020-01623-x
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DOI: https://doi.org/10.1007/s12598-020-01623-x