Abstract
Silicon suboxide (SiOx) is considered to be one of the most promising materials for next-generation anode due to its high energy density. For its preparation, the wet-chemistry method is a cost-effective and readily scalable route, while the so-derived SiOx usually shows lower capacity compared with that prepared by high temperature-vacuum evaporation route. Herein, we present an elaborate particle structure design to realize the wet-chemistry preparation of a high-performance SiOx/C nanocomposite. Dandelionlike highly porous SiOx particle coated with conformal carbon layer is designed and prepared. The highly-porous SiOx skeleton provides plenty specific surface for intimate contact with carbon layer to allow a deep reduction of SiOx to a low O/Si ratio at relatively low temperature (700 °C), enabling a high specific capacity. The abundant mesoscale voids effectively accommodate the volume variation of SiOx skeleton, ensuring the high structural stability of SiOx@C during lithiation/delithiation process. Meanwhile, the three-dimensional (3D) conformal carbon layer provides a fast electron/ion transportation, allowing an enhanced electrode reaction kinetics. Owing to the optimized O/Si ratio and well-engineered structure, the prepared SiOx@C electrode delivers an ultra-high capacity (1,115.8 mAh·g−1 at 0.1 A·g−1 after 200 cycles) and ultra-long lifespan (635 mAh·g−1 at 2 A·g−1 after 1,000 cycles). To the best of our knowledge, the achieved combination of ultra-high specific capacity and ultra-long cycling life is unprecedented.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Nos. U1637202 and 51634003), the National Key R&D Program of China (No. 2018YFB0905600), and Beijing Municipal Education Commission-Natural Science Foundation Joint Key Project (No. KZ201910005003).
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Li, Z., Zhao, H., Wang, J. et al. Rational structure design to realize high-performance SiOx@C anode material for lithium ion batteries. Nano Res. 13, 527–532 (2020). https://doi.org/10.1007/s12274-020-2644-9
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DOI: https://doi.org/10.1007/s12274-020-2644-9