期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 648, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.129193
关键词
Lithium-ion battery; Silicon anode; Ni nanoparticles; Calcination temperature; Electrochemical property
资金
- National Key Research and Development Project [2018YFE0124800]
- National Natural Science Foundation of China [51702157]
Si/C composite with Ni nanoparticles as anode for lithium-ion batteries was studied. The optimum electrochemical performance was achieved at a calcination temperature of 550℃, with high capacity and excellent rate performance. The addition of Ni nanoparticles improved the electronic conductivity of the composite.
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 Si@C-Ni composite anode is systematically studied. When the calcination temperature is 550 ?, the Si@C-Ni 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 Si@C-Ni-550 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 ?) leads to the rapid increase of Ni nanoparticles size which results in Ni aggregation on carbon, reducing the cycling stability and rate capability of Si@C-Ni. Our work offers a guide to prepare high performance metal-rich Si/C composite anode with appropriate synthetic temperature for LIBs.
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