Abstract
Silicon (Si) particles were functionalized using carbon dots (CDs) to enhance the interaction between the Si particles and the binders. First, CDs rich in polar groups were synthesized using a simple hydrothermal method. Then, CDs were loaded on the Si surface by impregnation to obtain the functionalized Si particles (Si/CDs). The phases and microstructures of the Si/CDs were observed using Fourier-transform infrared reflection, X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. Si/CDs were used as the active material of the anode for electrochemical performance experiments. The electrochemical performance of the Si/CD electrode was assessed using cyclic voltammetry, electrochemical impedance spectroscopy, and constant current charge and discharge experiment. The electrodes prepared with Si/CDs showed good mechanical structure stability and electrochemical performance. After 150 cycles at 0.2 C, the capacity retention rate of the Si/CD electrode was 64.0%, which is twice as much as that of pure Si electrode under the same test conditions.
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This work was financially supported by the Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang, China (No. 2019R01006) and the National Key R&D Program of China (Grant No. 2018YFB0104300).
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Du, Qk., Wu, Qx., Wang, Hx. et al. Carbon dot-modified silicon nanoparticles for lithium-ion batteries. Int J Miner Metall Mater 28, 1603–1610 (2021). https://doi.org/10.1007/s12613-020-2247-1
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DOI: https://doi.org/10.1007/s12613-020-2247-1