Abstract
The practical application of a titanium dioxide (TiO2) anode is restricted by the poor intrinsic ionic diffusion property and low theoretical capacity. Herein, sphere-like TiO2/Si nanoparticles were synthesized via a facile sol-gel method. Owing to the nano-spherical structure and the introduction of Si, the as-prepared TiO2/Si composite exhibits enhanced reversible capacity. Nanostructure of both TiO2 and Si materials provides short Li+ transmission pathways and high diffusion dynamics. The optimum ratio effectively alleviates the volume change of Si nanoparticles. The optimal mass ratio of TiO2/Si is 1:0.15, in which the composite electrode delivers excellent cycling life and rate performance, specifically, reversible capacity of 720.9 mAh g−1 at a current density of 100 mA g−1 and excellent long-term cycling stability with a capacity retention of 86.5% over 400 cycles.
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Funding
This work was financially supported by the project funded by the China Postdoctoral Science Foundation (2020M671361), Jiangsu Postdoctoral Science Foundation (2020Z090), National Natural Science Foundation of China (51774150 and 51974137), Scientific Research Foundation for Senior Talent of Jiangsu University (14JDG130), and Young Talents Training Program of Jiangsu University (2017).
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Zhou, Y., Liu, S., Liu, F. et al. Sphere-like TiO2/Si anode material with superior performance for lithium ion batteries. Ionics 26, 5349–5355 (2020). https://doi.org/10.1007/s11581-020-03730-2
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DOI: https://doi.org/10.1007/s11581-020-03730-2