Abstract
Si/C composite has been widely studied as high performance anode for lithium-ion batteries (LIBs) due to its high capacity and abundant resource. However, its practical application is still hampered by the limited electronic conductivity. Herein, Ni nanoparticles are introduced on Si/C composite by calcining porous Si covered with Ni2+-polydopamine complexes in this paper. The effect of the calcination temperature on the structure and electrochemical property of the obtained [email protected] composite anode is systematically studied. When the calcination temperature is 550 °C, the [email protected] shows the best electrochemical performance (a high capacity of 1622.9 mA h g−1 at 0.2 A g−1 after 100 cycles and an excellent rate performance of 1140 mA h g−1 at 6.4 A g−1). Its outstanding electrochemical performance of [email protected] is related to the optimized size and uniform dispersion of Ni nanoparticles which can offer additional electron highway, boosting the electronic conductivity of Si/C composite. Higher calcination temperature (≥650 °C) leads to the rapid increase of Ni nanoparticles size which results in Ni aggregation on carbon, reducing the cycling stability and rate capability of [email protected] Our work offers a guide to prepare high performance metal-rich Si/C composite anode with appropriate synthetic temperature for LIBs.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call